4 results about "Itaconic acid" patented technology

The invention relates to a water-reducing polycarboxylic concrete slump retaining agent and a preparation method thereof. The molecular weight of the water-reducing polycarboxylic concrete slump retaining agent ranges from 18000 to 48000, and the structural general formula of the water-reducing polycarboxylic concrete slump retaining agent is expressed by a formula I shown in the specification, wherein m ranges from 1 to 10, n ranges from 5 to 20, p ranges from 4 to 10, q ranges from 1 to 7 and k ranges from 1 to 10. Compared with the existing slump retaining agent, the water-reducing polycarboxylic concrete slump retaining agent has the advantages that a carboxylic acid group is capable of functioning in delaying coagulation and retaining slump, while an alcoholic hydroxyl group is capable of functioning in delaying coagulation, the molecule of itaconic acid introduced in the molecular structure of the water-reducing polycarboxylic concrete slump retaining agent contains two -COOHs, and thus is capable of complexing with Ca2<+> and effectively delaying cement hydration, a sulfonic acid group introduced in the molecular structure of the slump retaining agent is capable of dispersing cement particles at first and delaying cement hydration, and a benzene ring in the molecular structure is easy to generate steric-hinerance effect and enhances the dispersion stability of the water-reducing agent; besides, the water-reducing polycarboxylic concrete slump retaining agent is obvious in slump retaining effect, and is low affected by weather; when being matched with other additives for use, the water-reducing polycarboxylic concrete slump retaining agent is good in compatibility with other additives; the slump retaining agent is capable of obtaining efficient slump retaining effect by a dosage within a low range.

The invention discloses a surface artemisinin molecule imprinting adsorbing material of a vegetable sponge. The material is characterized characterized by being prepared by the following steps of: preparing a polymer by selecting vegetable sponge as a substrate material, taking artemisinin as a template molecule, taking itaconic acid and acrylamide as functional monomers, taking ethylene glycol dimethacrylate as a cross-linking agent, taking azodiisobutyronitrile as an initiator and taking N,N-dimethylformamide as a solvent; and removing the artemisinin by using a hexane-diethyl ether mixed solution. The invention further provides a preparation method and an application method of the surface artemisinin molecule imprinting adsorbing material of the vegetable sponge. The surface artemisinin molecule imprinting adsorbing material of the vegetable sponge can separate the artemisinin with a structural analogue under normal pressure and temperature conditions; and the surface artemisinin molecule molecular imprinting adsorbing material of the vegetable sponge has the advantages of specificity, selectivity, good mechanical performance, good chemical stability, fast adsorbing speed, easiness for being eluted, biodegradability, simple process, regeneration capability, environmental friendliness and the like.

The invention discloses a lightweight high-toughness military shelter structural adhesive and a preparation method thereof. The structural adhesive is prepared by compounding a component A and a component B according to a mass ratio of 100 : 20-50, wherein the component A comprises, by mass, 70-100 parts of epoxy resin, 10-20 parts of an itaconic acid-based hyperbranched polyester ether active toughening agent, 5-20 parts of a diluent, and 20-30 parts of an inorganic filler; and the component B is prepared from the following components in parts by mass: 30-80 parts of modified cardanol-based polyamine, 10-30 parts of polyamide and 1-2 parts of a coupling agent. The military shelter structural adhesive formula is suitable for bonding of honeycomb sandwich panels, polyurethane foam sandwichpanels, aluminum skin or carbon fiber plate skin and the like. The adhesive is low in viscosity, simple in curing process, high in peeling and shearing strength, high in high-temperature creep resistance and stable in quality; main raw materials are derived from renewable resources, so that the military shelter structural adhesive is more environmentally friendly, low in cost, easy to obtain and suitable for large-scale popularization and application. The invention has great application prosepct.

The invention provides a weak gelling agent, a preparation method of the weak gelling agent, a cement paste suspension stabilizer and application of the cement paste suspension stabilizer. The weak gelling agent is obtained by initiating reaction of raw materials through an initiator, and the raw materials comprise sodium p-styrenesulfonate, itaconic acid, acrylic acid, N, N '-dimethylacrylamide, N-isopropylacrylamide or N-hydroxymethyl acrylamide and N-vinyl pyrrolidone. The weak gelling agent can relieve the phenomena of dilution and viscosity reduction generated in well cementation construction. The invention further provides a cement paste suspension stabilizer which comprises a tackifying and shear strength improving agent and the weak gelling agent. The invention further provides application of the cement paste suspension stabilizer in well cementation construction at the temperature of 200 DEG C or above. The cement paste suspension stabilizer can ensure the safety of cementing and well cementation construction under high-temperature and ultrahigh-temperature working conditions, and can improve the packing effect and well cementation quality of a deep stratum.