Multilayer condom containing modified polyurethane raw material and preparation method of multilayer condom

Abstract

The invention provides a multilayer condom containing a modified polyurethane raw material and a preparation method of the multilayer condom. The preparation method of the condom comprises the following steps: (1) preparation of an inner-layer adhesive film: reacting polyisocyanate with a chain extender to obtain a fluorine-containing and silicon-containing polyurethane emulsion, and then forminga film to prepare the inner-layer adhesive film; (2) preparation of an intermediate layer adhesive film: blending polyisoprene rubber and a modified polyurethane emulsion to prepare the intermediate layer adhesive film; (3) preparation of an outer adhesive film: preparing rosin modified resin latex from maleated rosin through emulsion polymerization, and then blending the rosin modified resin latex with modified polyurethane emulsion and polyisoprene rubber emulsion to form a film; and (4) hemming, demolding and forming to obtain a finished product. The multilayer condom has the advantages ofno special smell, no anaphylactic reaction, high tensile strength, high elongation at break, good toughness, high resilience, good bacteriostasis effect on a plurality of common bacteria, efficient barrier performance on small molecules, good processing and production, and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of contraceptive tools, and in particular relates to a multilayer condom containing modified polyurethane raw materials and a preparation method thereof. Background technique [0002] Condoms prevent conception in a non-drug form and are the most commonly used contraceptive tool in the world. According to incomplete statistics, the consumption of condoms in China is nearly 12 billion per year. At present, condoms are not only a tool for family planning, but also one of the most effective methods to prevent the spread of sexually transmitted diseases. With the rapid spread of AIDS and other sexually transmitted diseases, the situation of AIDS prevention and treatment is becoming increasingly severe, and the quality of condom products is also increasing. Gaining importance. [0003] The main raw material for the manufacture of condoms is natural rubber latex, which has always occupied a dominant position in t...

AI Technical Summary

Problems solved by technology

However, natural rubber latex contains many non-rubber components such as allergic water-soluble protein and other biopolymers. If the water-soluble protein in the latex exceeds a certain content, the user's skin will have allergic reactions such as erythema and itching. Many people with severe allergies There may even be life-threatening convulsions, tremors, etc.

Since the 1980s, natural rubber latex medical and sanitary products have caused frequent human allergy incidents. In the United States, it is estimated that about 17 million people are allergic to natural latex. The allergenicity of natural rubber has been warned. Later, scientists tried to reduce the allergenicity of natural rubber through various methods, but the effect has been minimal. So far, the allergenicity of natural rubber has not been well resolved. solve

On the other hand, condoms made of natural rubber also have the following disadvantages: odor, low tolerance to oil-based lubricants, and rapid loss of strength

[0010] At present, the modification of various condom film materials is still being studied, but there is still no condom that can have many advantages of the above three condoms. Can the method of modification improve the quality of condom rubber? In addition to the tensile strength of the film, it can also significantly improve its elongation at break, and can well ensure the mechanical properties and performance of the condom. Solving the defects of the existing three condom materials has become an urgent technical problem to be solved.

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