Hydrophilic breathable medical hot melt pressure sensitive adhesive matrix and preparation method thereof

[0021] (1) Formulation:

[0022] 70 parts of polyisobutylene (polyisobutylene N50), 30 parts of methyl vinyl silicone rubber, 10 parts of plasticizer (paraffin oil), 10 parts of silicate clay (sepiolite); among them, sepiolite has been subjected to the following Impurity removal treatment: take sepiolite and place it in hydrochloric acid with a concentration of 1mol / L, stir and soak it at 70°C for 2 hours, take it out, wash it with water until it is neutral, and dry it.

[0023] (2) Preparation method:

[0024] ① Weigh each component according to the formula and set aside;

[0025] ② Soak polyisobutylene in plasticizer until it swells;

[0026] ③ Put the swollen polyisobutylene and methyl vinyl silicone rubber in a rubber internal mixer, and knead at a speed of 50r / min at 180°C for 20min; then add silicate clay, and mix at 180°C at a speed of 20r / min The mixing speed is 40min to obtain the hydrophilic air-permeable medical hot-melt pressure-sensitive adhesive matrix. Th

[0044] (1) Formulation:

[0045] 75 parts of polyisobutylene (polyisobutylene N50), 25 parts of methyl vinyl silicone rubber, 15 parts of plasticizer (naphthenic oil), 5 parts of silicate clay (illite); among them, illite has undergone the following removal in advance Miscellaneous treatment: take illite and place it in hydrochloric acid with a concentration of 2mol / L, stir and soak it at 60°C for 2 hours, take it out, wash it with water until it is neutral, and dry it.

[0046] (2) Preparation method:

[0047] With embodiment 1.

[0049] (1) Formulation:

[0050] Polyisobutylene (polyisobutylene N50) 65 parts, methyl vinyl silicone rubber 35 parts, plasticizer (composed of wax oil and naphthenic oil in a weight ratio of 1:1) 10 parts, silicate clay (made of montmorillonite soil and kaolin at a weight ratio of 1:1) 8 parts; wherein, montmorillonite and kaolin have been subjected to the following impurity removal treatment in advance: take montmorillonite and kaolin respectively with sulfuric acid with a concentration of 1mol / L at 60 ° C Stir and soak for 2 hours, take it out, wash with water until neutral, and dry.

[0051] (2) Preparation method:

[0052] With embodiment 1.