Die for producing water-base polyurethane condom

Abstract

The invention relates to a die for producing a water-base polyurethane condom. The die is made of a polytetrafluoroethylene material, namely the die can be made of a pure polytetrafluoroethylene material and also can be made of the polytetrafluoroethylene material added with glass fibers or the polytetrafluoroethylene material added with iron powder. The die can bear the change of high and low temperature repeatedly, realize a membrane-carrying drying process in a straight dipping method of the condom and reduce adhesion degree between the die and a glue membrane, and has the advantages that the glue membrane is easy to crimp and is non-stick.

Description

technical field [0001] The invention relates to a mold for the production of latex products, in particular to a mold for the production of polyurethane impregnated products, in particular to a mold for the production of water-based polyurethane condoms. Background technique [0002] Condoms are one of the most widely used contraceptives in the world. As the situation of AIDS prevention and treatment becomes increasingly severe, the quality of condom products is also paid more and more attention. In the prior art, the main raw material for making condoms is natural latex, and natural latex contains many non-rubber components such as allergic water-soluble protein. If the water-soluble protein in the latex exceeds a certain content, the user's skin will produce erythema , itching and other allergic reactions, with severe discomfort. On the other hand, the natural cracks of natural rubber latex are 5000 to 70000 nanometers, and the volume of various viruses is far smaller tha...

AI Technical Summary

Problems solved by technology

But, because the composition difference of polyurethane material and natural rubber latex is very big, natural rubber latex condom production method and mold can't be adapted to the production of water-based polyurethane condom in the prior art, the main reason is the selection of mold material

As an elastic film product, condoms are generally produced by the direct immersion process, which requires that the product has a good mold attachment effect and can form a uniform film on the model. In the production process, a film-drying process is required, that is, the mold needs to be repeated. It can withstand the temperature difference from normal temperature to 150 degrees, so the requirements for molds are very high. In the prior art, natural latex condoms are usually produced with molds. The mold materials for natural latex condoms are generally glass, ceramics, stainless steel, etc., while water-based polyurethane The raw material is a material that can be firmly bonded to the above materials. It is often used to produce paints, water-based paints, etc. that are firmly bonded to glass, ceramics, stainless steel and other materials. Therefore, when used as a water-based polyurethane condom, the water-based polyurethane contraceptive The sleeve will be bonded to the mold, and there will be problems of difficult crimping and film release

Those skilled in the art have tried to add weak coagulants, molding agents, impregnated swelling agents in the production process, or do resin coating on the surface of glass, ceramics, stainless steel and other molds, but the ideal demoulding effect has not yet been achieved.

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