42 results about "Prepolymer" patented technology

The invention discloses a microporous polyurethane elastomer shock absorption element for a high-speed railway. The shock absorption element is characterized by being prepared by stirring and mixing a mixture I and a quasi-prepolymer II at the temperature of between 35 and 55 DEG C for 2 to 5 minutes to obtain a mixture, wherein the mixture I consists of the following components in part by weight: 23 to 40 parts of polyether polyol A, 5 to 10 parts of chain extender, 0.1 to 0.5 part of water, 0.2 to 0.55 part of silicone oil foam homogenizing agent and 0.15 to 0.3 part of catalyst, and the quasi-prepolymer II is prepared by reacting 2.5 to 8 parts of modified nanokaolin, 24 to 30 parts of polyether glycol and 30 to 40 parts of polyisocyanate; pouring the mixture into a die which is pre-heated to 45 to 70 DEG C and is coated with a de-molding agent for molding, de-molding, and curing at the temperature of between 80 and 100 DEG C for 10 to 20 hours. The indexes of the shock absorption element meet the requirements of the HE/3328-2006 standard.

The invention discloses a full-automatic resin lens casting machine, belonging to the technical field of manufacture of lenses. The full-automatic resin lens casting machine comprises a rack (1) and a PLC control unit (2) arranged on the rack (1), wherein an automatic mold transmitting mechanism, an automatic casting mechanism, an automatic sealing mechanism and an automatic recycling mechanism are arranged on the rack (1); control signals of the automatic mold transmitting mechanism, the automatic casting mechanism, the automatic sealing mechanism and the automatic recycling mechanism are respectively connected with the PLC control unit (2) and are controlled by the PLC control unit (2). The full-automatic resin lens casting machine solves the technical problem that a prepolymer is injected to an assembled glass mold from a sealing ring injecting hole by manpower only during the production process of thermoplastic resin lenses, achieves the functions of automatic lens mold transmitting, automatic casting, automatic sealing and automatic recycling, is high in automatic degree and can completely replace the manual casting mode, so that the resin lenses can meet the requirement of scaled production, the manufacturing efficiency of the lenses is improved, and the quality of the manufactured lenses is increased.

The invention discloses a thermoplastic cellulose-based solid-solid phase transition material and a preparation method thereof. The preparation method comprises the following steps: 1, drying cellulose or a cellulose derivative; 2, respectively dissolving a cross-linking agent and polyethylene glycol alkyl ether in an organic solvent I to obtain a cross-linking agent solution and a polyethylene glycol alkyl ether solution, adding the polyethylene glycol alkyl ether to the cross-linking agent solution in a dropwise manner, adding a catalyst, and reacting for 0.5-10h to obtain a prepolymer solution, wherein a mole ratio of the polyethylene glycol alkyl ether to the cross-linking agent is 1:1; and 3, dissolving cellulose in an ionic liquid to obtain a cellulose solution, adding the prepolymer solution, acid anhydride and a catalyst to the above obtained cellulose solution, carrying out a polymerization reaction for 2-24h to obtain a finally obtained mixture, adding the finally obtained mixture to deionized water or an organic solvent II for precipitation, repeatedly washing the above obtained precipitate with deionized water 2-3 times, and carrying out vacuum drying to obtain the thermoplastic cellulose-based solid-solid phase transition material. The phase transition material has a good thermal stability and a melting processing performance, and can be blended with a thermoplastic copolymer matrix for melting processing.

The invention discloses a double-tail four-functional hydrophilic UV (Ultraviolet) coating hardness assistant and a preparation method thereof. The preparation method comprises the following steps: firstly, reacting polyethylene glycol monomethyl ether, isocyanate and one-generation hyperbranched polymer to form a prepolymer I, and subsequently reacting a prepolymer obtained after crylic acid monomer is reacted with isocyanate with the prepolymer I, thereby preparing the double-tail four-functional hydrophilic UV coating hardness assistant. According to the preparation method, high-functionality hyperbranched molecules are adopted as primary reaction materials, the characteristics that the hyperbranched molecules are high in functionality but low in viscosity are taken, when the prepared hardness assistant is added into an aqueous UV resin, not only is the problem that a coating is always low in curing property but high in viscosity solved, but also the water solubility of the UV resin is improved, the hardness of the aqueous UV resin is also improved, and the application range of the aqueous UV resin is widened. When non-ionic polyethylene glycol methyl ether is connected to molecules, therefore the acid-alkali resistance of the coating is improved, an emulsion system is well stabilized, and experiment shows that the effect is good.

Adhesive systems comprising: (A) an isocyanate group-containing prepolymer prepared by reacting: (A1) an aliphatic isocyante; and (A2) a polyol having a number average molecular weight of ≧400 g/mol and 2 to 6 OH groups; and (B) a curing component comprising: (B1) an amino group-containing aspartate ester of the general formula (I);

wherein X represents an n-valent organic radical derived from a corresponding n-functional primary amine X(NH₂)_n, R₁ and R₂ each independently represent an organic radical having no Zerevitinov active hydrogens and n represents a whole number of at least 2; and (B2) an organic filler having a viscosity of 10 to 6000 mPas at 23° C. measured according to DIN 53019; their use in wound and tissue incision closure, adhesive films comprising the same and dispensing systems therefor.

The invention belongs to the technical field of functional building paint and relates to photochromic glass paint and a preparation method thereof. The photochromic glass paint is prepared from the following raw materials in weigh ratio: 20 to 50 parts of prepolymer, 5 to 20 parts of active monomer, 0.1 to 1 part of initiator, 5 to 20 parts of color changing powder, 0.1 to 1 part of wetting agent,0.1 to 1 part of dispersant, 0.5 to 3 parts of adhesion promoter, 0.5 to 2 parts of enhancer and 0.5 to 3 parts of nano material. The surface of general glass is simply coated with one layer of the photochromic glass paint disclosed by the invention, so that the general glass can achieve a photochromic effect; thus, the surface of the general glass can be coated with the paint in a large scale infactories to manufacture photochromic glass, and construction can be performed in existing building sites to manufacture the photochromic glass.

The present invention relates to a method of preparing water-dispersible poly (urethane-urea) having aliphatic-aromatic isocyanate, more particularly to a method of preparing water-dispersible poly (urethane-urea) having aliphatic-aromatic isocyanate, with improved mechanical/thermal properties, such as heat resistance, chemical resistance and adhesion, good cost competitiveness and environmental friendliness, by reacting polyester polyol, dimethylol propionic acid and an aromatic isocyanate compound to obtain a hydroxyl (OH)-terminated prepolymer, adding an aliphatic isocyanate compound to said OH-terminated prepolymer to obtain an isocyanate (NCO)-terminated prepolymer wherein aromatic-aliphatic isocyanate is hybridized, neutralizing, water-dispersing and chain extending said NCO-terminated prepolymer.

The invention discloses a preparation method of a waterborne polyurethane emulsion and the waterborne polyurethane emulsion prepared by the preparation method. The preparation method comprises the following steps: (1) synthesizing a polyurethane prepolymer: mixing and dehydrating polypropylene oxide polyether glycol and polycarbonate diol, dropwise adding toluene diisocynate after dehydrating for heat-preserving reaction, and finally dropwise adding prepared mixed solution of dihydroxybutyric acid, 1, 4-butanediol and acetone for heat-preserving reaction to finally prepare the prepolymer; (2) adding aminoalkyl silicon oil, an inner crosslinking agent and hydroxy-propyl acrylate to modify; (3) neutralizing to salify: dropwise adding an acetone solution of a neutralizer triethylamine into the modified prepolymer prepared in the step (2) for reaction so as to prepare a polyurethane salified solution; and (4) dissolving disulfamate and a diamido chain extender in water, quickly adding to the polyurethane salified solution which is stirred at a high speed, quickly dispersing and extending chains, and heating the emulsion to remove the solvent through evaporation to obtain the waterborne polyurethane emulsion.

The invention discloses a solvent-free isocyanate prepolymer, a preparartion method of the solvent-free isocyanate prepolymer and an isocyanate composition. The preparation method of the solvent-free isocyanate prepolymer comprises the following steps of carrying out dehydration treatment on a dihydric alcohol polymer, dividing the dehydrated dihydric alcohol polymer into three parts, and orderly adding the three parts of the dehydrated dihydric alcohol polymer into isocyanate monomers. The isocyanate composition comprises the solvent-free isocyanate prepolymer as a base component. Through a subsequent feeding method, the preparartion method realizes a reaction of the dihydric alcohol polymer and the isocyanate monomers so that the solvent-free isocyanate prepolymer has relatively low viscosity and a loss of an NCO effective function group of the solvent-free isocyanate prepolymer is effectively avoided. The isocyanate composition utilizes the solvent-free isocyanate prepolymer as a base component, has low viscosity and good stability, is free of a solvent, effectively reduces a cost and is environmentally friendly and safe.

The invention provides a photocurable polyester oligomer for 3D printing as well as a preparation method and application thereof. The preparation method comprises the following steps of: carrying outvacuum heating dehydration on an aliphatic hydroxyl acid monomer to prepare a polyester prepolymer, adding an initiator in the presence of polyol to prepare a hydroxyl-terminated prepolymer by a meltcopolymerization method, and finally adding acrylic acid anhydride to prepare the photocurable aliphatic polyester oligomer. The prepared photocurable aliphatic polyester oligomer can be directly combined with a photoinitiator, and is suitable for DLP type 3D printing. The photocurable aliphatic polyester resin material prepared by the method is high in purity, relatively low and adjustable in viscosity, can be used in the biomedical field, especially in the fields of drug sustained release, tissue engineering, bone fixation, repair materials and the like, a photocuring polyester degradation material is combined with a 3D printing technology, the printed material is non-toxic and has excellent biocompatibility and mechanical properties, the degradation rate is between 6 months and 36 months, and a new direction is provided for application of 3D printing.

The present invention provides a polyurethane resin, aqueous polyurethane resin, aqueous modifier, moisture permeating resin and a method for making the polyure thane resin. To provide an aqueous polyurethane resin which can endow excellent hydrophilicity to the aqueous resin because of excellent compatibility and water swellability in the formed film, or the aqueous polyurethane resin composed of polyurethane resin and the hydrophilic modifier comprising the aqueous polyurethane resin, a moisture permeating resin comprising the polyurethane resin, and a method for preparing the polyurethane resin, in the invention at least the polyurethane prepolymer comprising anionic group is reacted with the polyamine containing polyoxyethylene group to obtain polyurethane resin. The polyurethane resin is dispersed and/or dissolved into the water and the aqueous polyurethane resin is obtained, and the moisture permeating resin can be obtained by assorting the aqueous modifier composed of the aqueous polyurethane resin in the aqueous resin.

The invention relates to the field of composite materials and especially relates to a preparation method of a glass/polymethyl methacrylate (PMMA) micro-nano interface structure laminated material. The preparation method comprises the following steps that 1, polymethylhydrosiloxane and ethyl orthosilicate undergo a hydrolysis reaction under the alkaline conditions to produce silica sol; and the silica sol is coated on the surface of glass to form a silica porous film having aperture sizes of 0.2 to 2mm; 2, a methyl methacrylate monomer, a plasticizer and an initiator are mixed according to a certain ratio and then undergo prepolymerization to produce a PMMA prepolymer; 3, the silica porous film is coated with the PMMA prepolymer and then is subjected to heat treatment in vacuum; and 4, the silica porous film with the PMMA prepolymer undergoes heat treatment polymerization in a high-pressure nitrogen atmosphere to produce the glass/PMMA micro-nano interface structure laminated material. The glass/PMMA micro-nano interface structure laminated material has excellent performances of high transparency, impact resistance, fatigue resistance and aging resistance.

The invention discloses a weather-resistant impact-resistant waterproof plugging material with stable quality. The material comprises the following raw materials by weight: 1-2 parts of a water reducing agent, 15-25 parts of polyvinyl alcohol, 10-20 parts of a tackifying promoter, 30-40 parts of a polyurethane prepolymer, 20-30 parts of a magnesium acrylate emulsion, 10-16 parts of ore filling, 3-5 parts of white carbon black, 2-4 parts of a nanometer additive, 5-9 parts of dispersible adhesive powder, 3-7 parts of a weather-resistant aid, 10-14 parts of reinforced fibers and 10-12 parts of water. The waterproof material provided by the invention has the characteristics of stable performance, resistance to cold and heat impact, aging resistance, no cracking, no deformation and superior waterproof performance and impermeability; the material has excellent impact fatigue resistance in outdoor usage and can effectively resist high-frequency repeated impact by heavy rain and hail; the raw materials of the material are safe, reliable, friendly to environment, easily available and cheap; the preparation method for the material is simple; so the material provided by the invention has high practical value and good application prospects.

The invention provides a high-fidelity durable lightfast UV/UVLED curing coating for a note and a preparation method of the high-fidelity durable lightfast UV/UVLED curing coating. The high-fidelity durable lightfast UV/UVLED curing coating comprises a prepolymer, a pre-polymerization monomer, an initiator, an assistant, a stabilizer and an amine type accelerator, wherein the prepolymer is one of or a combination of more of aliphatic modified epoxy acrylate, acid modified urethane acrylate, aliphatic urethane acrylate, and aromatic urethane acrylate; the pre-polymerization monomer is one of or a combination of more of methacrylate, acrylate, and a vinyl ether monomer. The UV/UVLED coating has the characteristics of transparency, high whiteness and low glossiness, the original color of a printing material is not changed after the surface of the printing material is coated with the coating, and the coating is high in fidelity, and has the physical and chemical resistant properties meeting the requirements of the note when applied to the note.

The invention discloses amphoteric polyurethane. Firstly, diisocyanate, hydroxyl-terminated polymer, a cation chain extender and a catalyst are mixed to be uniform, terminated isocyanate group polyurethane prepolymer containing tertiary amine is prepared through a prepolymerization reaction, after that, aromatic compound micromolecules containing hydroxyl-terminated and sulfonyl are taken as an anion chain extender, and amphoteric polyurethane containing tertiary amine and sulfonyl simultaneous is prepared and obtained through an end capping reaction. The invention further discloses the application of amphoteric polyurethane serving as a retanning agent for reducing free formaldehyde in leather, a neutralizing agent and water are added into amphoteric polyurethane to prepare amphoteric polyurethane emulsion which can serve as the retanning agent rightly. The retanning agent can enable the removal rate of free formaldehyde in leather to reach 80% or above when being used in the retanning process of leather.

The invention discloses room-temperature self-crosslinking fluorine-containing water-based polyurethane (PU) dispersion, a preparation method and application thereof. The PU dispersion comprises fluorine-containing PU resin, a room-temperature cross-linking agent and water. The preparation process comprises the following steps of: 1) synthesizing a PU prepolymer; 2) synthesizing a fluorine-containing PU oligomer; 3) preparing fluorine-containing water-based PU dispersion; and 4) preparing the room-temperature self-crosslinking fluorine-containing water-based PU dispersion. The PU dispersion can be used for the water repellency and fouling prevention of fabrics, and after being dried at the room temperature, the PU dispersion undergoes self-crosslinking to form a self-crosslinked net structure to be embedded into fabric fibers; the functions of the water repellency and fouling prevention can be adjusted randomly according to purposes; and due to no organic volatile matters and toxic substance residues in the treatment process, so the PU dispersion is a long-acting fabric treatment agent which is environmentally-friendly, is resistant to washing and solvent and has long-lasting water repellency and anti-fouling performance.

The invention relates to a polyamic acid solution, a preparation method and applications thereof. In the prior art, the polyamic acid raw solution is non-uniform, and has more gel particles, such thatthe process is not easily controlled, and the quality of the product is reduced. A purpose of the present invention is mainly to solve the problems in the prior art. According to the technical scheme, a polyamic acid solution is provided, and comprises a mixed solution of a prepolymer solution 1 and a prepolymer solution 2, wherein the prepolymer solution 1 is obtained by carrying out a reactionon X moles of diamine and Y moles of dianhydride, the prepolymer solution 2 is obtained by carrying out a reaction on Z moles of diamine and K moles of dianhydride, Y/X is more than or equal to 0.5 and is less than or equal to 0.98, and K/Z is more than or equal to 1.02 and is less than or equal to 2.0. With the technical scheme, the problem in the prior art is well solved. The product of the present invention can be used in the industrial production of polyimide materials.

The invention discloses an environmentally-friendly color pavement coating material. The pavement coating material is composed of an A component and a B component, wherein a ratio of the A component to the B component is (5-20):1; the component A contains the following components: 5-30% of methyl methacrylate, 1-9% of methacrylic acid, 5-20% of butyl methacrylate, 2-10% of a peroxide initiator, 0-5% of an azo initiator, 0-5% of an azo amidine initiator, 0-15% of titanium dioxide, 0-15% of silicon dioxide, 0-20% of bauxite, 0-3% of a plasticizing agent, 1-5% of color paste, 0.2-2% of a thickening agent, and the balance of a prepolymer; and the B component contains the following components: 5-35% of methyl methacrylate, 2-9% of methacrylic acid, 5-20% of butyl methacrylate, 0-5% of an azo initiator, 0-5% of an azo amidine initiator, 0-15% of titanium dioxide, 0-15% of silicon dioxide, 1-3% of an ultraviolet stabilizer, 2-9% of N,N-dimethylaniline, and the balance of a prepolymer.

A UV photocuring product comprises an initiator and a photosensitive prepolymer and/or an active monomer thereof. The initiator comprises a radical initiator and a positive ion initiator capable of photolyzing and producing superacid; after absorbing light energy, the positive ion initiator can jump to an excited state, molecules produce photolysis reaction to generate superacid, after the photosensitive prepolymer and/or the active monomer thereof can be catalyzed and promoted at the normal temperature to initiate free radical photopolymerization by high-energy UV ultraviolet radiation, polycondensation is carried out to continue to crosslink, and thus, the curing degree is improved; and the positive ion initiator comprises an acrylate photosensitive prepolymer containing aminoalkoxy andan acrylate photosensitive prepolymer containing active hydroxyls, and the active monomer of the acrylate photosensitive prepolymer containing aminoalkoxy is selected from hydroxyl-containing (methyl)acrylate or vinyl active monomer.

The invention relates to an emulsion acrylic pressure-sensitive adhesive and a preparation method thereof. The preparation method comprises the steps of: preparing a prepolymer by using methyl methacrylate (MMA) and vinyl acetate (VAc) as raw materials; adding an acrylic acid diluent for diluting; adding hydroxyethyl-2-methacrylate (HEMA) for modification; and adjusting the pH value to prepare the emulsion acrylic pressure-sensitive adhesive. The emulsion acrylic pressure-sensitive adhesive has the advantages of strong environmental protection property, high stripping strength and good stability.

The invention discloses a reactive permeable tack coat material special for water permeable pavement. The reactive permeable tack coat material is composed of a component A and a component B, whereinthe component A comprises the following components in parts by weight: 30-50 parts of end-NCO group-terminated polyurethane prepolymer, 40-50 parts of penetrating fluid, 5-10 parts of SBS, 2-5 parts of petroleum resin, 3-8 parts of natural rosin resin, 0-1 part of flame retardant and 1-3 parts of diluent; the component B comprises the following components in parts by weight: 100 parts of a polyolcuring agent and 1-3 parts of a catalyst. The tack coat material provided by the invention is a reactive permeable tack coat material specially applied to permeable pavement, which greatly improves adhesion and durability, in particular, the tack coat material has good permeability for the permeable pavement with macropores, does not block pores, has small system viscosity, and strong adhesion, and is simple in preparation process, economic and durable.

The invention provides a method for synthesizing heat-resistant polyurethane based on soybean oil. The method comprises the following steps in sequence: adding the soybean oil and a catalyst to a reactor; adding polyisocyanates to react to obtain a polyurethane prepolymer; adding 1, 4-butanediol and polyol oligomer containing the same hydroxy based on mole to the polyurethane prepolymer; fully stirring for 1 to 3 minutes; and tabletting through a vulcanizing machine so as to obtain polyurethane. The method for synthesizing heat-resistant polyurethane based on soybean oil has the characteristics of being simple in process and easy to operate.

The invention provides an adhesive, a preparation method thereof and a skin. The preparation method comprises the following steps: carrying out styrene-butadiene-styrene (SBS) epoxy modification: carrying out a reaction on an SBS copolymer, an organic acid and hydrogen peroxide to obtain an SBS epoxy modified product; synthesizing a main agent: carrying out a chain extension reaction on polyol anda first polyisocyanate to obtain an isocyanate prepolymer; mixing the isocyanate prepolymer, a part or all of the SBS epoxy modified product and a first solvent to obtain the main agent; synthesizinga curing agent: carrying out a reaction on isocyanate groups of a second polyisocyanate with hydroxyl groups of trimethylolpropane in a second solvent to obtain trimethylolpropane modified isocyanate; and preparing the adhesive: mixing the main agent with the curing agent to obtain the adhesive. The adhesive prepared by the preparation method provided by the invention has proper hardness and excellent tear resistance.

The invention discloses a novel moisture-curing flame-retardant polyurethane hot melt adhesive and a preparation method thereof. The novel moisture-curing flame-retardant polyurethane hot melt adhesive is characterized by being prepared from 1-20 parts of polyether diols, 1-35 parts of liquid polyester diols, 1-40 parts of flame-retardant polyether glycol, 1-35 parts of crystalline polyester diols, 1-35 parts of an isocyanate-containing modified polyacrylic acid fluorosilicone copolymer, 1-50 parts of isocyanate, 0.01-1 part of a catalyst, 0.01-1 part of an antioxidant and 0.1-2 parts of a silane coupling agent. The isocyanate-containing modified polyacrylic acid fluorosilicone copolymer is synthesized firstly, the chemical structure of the copolymer is poly(hexafluorobutyl acrylate-random-monomethacryloxypropyl terminated polydimethylsiloxanes-random-methyl acrylate-random-isocyanatoethyl methacrylate, the copolymer is added to a polyurethane prepolymer and subjected to condensation polymerization, a fluorosilicone-containing acrylate copolymer chain segment and a reaction type flame retardant are introduced and have an efficient synergistic effect, and therefore, comprehensive chemical resistance, oil resistance, water resistance and flame retardance are improved.

A process for preparing the single-chip pneumatic gel microvalve includes such steps as preparing copying microtemplate by fast prototype technique, casting silicone rubber to obtain substrate with pump cavity and microchannels, plasma etching to obtain glass substrate with heating and sensing electrodes, reactive ion treating for packaging said both substrates, and ultraviolet catalyzing to gel prepolymer to obtain the gel core of microvalve.

Polyester resin particles are provided as those capable of providing a highly transparent molded product by thermoforming, while suppressing fusion of the polyester prepolymer particles in a heat treatment thereof such as crystallization or solid-phase polycondensation, without reduction in a solid-phase polycondensation rate.

The present invention provides a method for producing a polyester resin, comprising carrying out a hot-water treatment and a heat treatment, in this order, of polyester prepolymer particles obtained by melt polycondensation of a dicarboxylic acid component and a diol component. The hot-water treatment comprises bringing the polyester prepolymer particles with an intrinsic viscosity of from at least 0.10 dL/g to at most 1.0 dL/g and with a density of at most 1.36 g/cm³ into contact with hot water at a temperature higher than the glass transition temperature of the polyester prepolymer particles and less than 100° C., under the condition satisfying the following formula (1):

40≦(T−Tg)t≦6000  (1)

wherein t is a hot-water treatment time (second), T is the temperature of the hot water (° C.) and Tg is the glass transition temperature (° C.) of the polyester prepolymer particles.

The invention relates to a preparation method of hydroxyl polyurethane (PHU). An isocyanate route for synthesizing traditional polyurethane (PU) is adopted in the method to synthesize PHU for the first time, and the preparation of linear PHU is divided into two steps, namely prepolymerization and chain extension. The preparation method comprises the following steps: firstly, reacting excessive diisocyanate monomers with macromolecular diol to obtain an isocyanate-terminated prepolymer; then adding a ketal (aldehyde) protected diol chain extender for a reaction with the prepolymer to obtain PU-ketal (aldehyde); and finally, hydrolyzing a ketal (aldehyde) protecting group in a PU-ketal (aldehyde) structure into a hydroxyl group under an acidic condition to obtain PHU. The preparation of cross-linked PHU comprises the following steps: subjecting the linear PHU to reacting with a diisocyanate monomer, and controlling a ratio of the PHU to the diisocyanate monomer to allow a part of hydroxyl groups to be still reserved on a PHU main chain, thereby obtaining the cross-linked PHU. Compared with the prior art, the method has the advantages of simple operation, easily available raw materials, low economic cost and high product yield, and is suitable for large-scale industrial production.