Die for producing water-base polyurethane condom

A technology for water-based polyurethane and condoms, which is applied in the field of molds for the production of polyurethane impregnated products and molds for the production of water-based polyurethane condoms. The effect of weather aging resistance life and good mechanical toughness

Inactive Publication Date: 2011-06-29
CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Die for producing water-base polyurethane condom
  • Die for producing water-base polyurethane condom
  • Die for producing water-base polyurethane condom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of water-based polyurethane condom production mold, such as Figure 1-3 As shown, it is made of a pure polytetrafluoroethylene layer 2 wrapped on the outer wall of the stainless steel tube 1 used for female condom production, and made into a hollow one with a bell mouth diameter of 50 mm and a bell mouth diameter of 70 mm. A mold for the production of female condoms. One end of the stainless steel pipe 1 for the production of female condoms is placed outside the pure polytetrafluoroethylene layer 2. This mold is used to produce a horn with a diameter of 50 mm and a diameter of the bell mouth of 70 mm. The female condom with the mouth adopts the direct immersion drying process with film. The mold has repeatedly withstood the high and low temperature changes from 0 to 150 degrees during the film drying process. It has good stability and is easy to curl when the condom is processed. sticky mold.

Embodiment 2

[0039] A kind of water-based polyurethane condom production mold, such as Figure 4-6 As shown, it is a polytetrafluoroethylene layer 4 filled with glass fiber that is fully wrapped on the outer wall of the stainless steel tube 3 for male condom production to make a hollow mold with a diameter of 35 mm for male condom production. Glass fiber weight percentage is 5% in the polytetrafluoroethylene material layer 4 of glass fiber, adopts this mold production diameter to be the water-based polyurethane male condom of 35 millimeters, adopts direct immersion method band film drying process, and this mold is dried in band film During the process, it has repeatedly withstood high and low temperature changes from 0 to 150 degrees. The water-based polyurethane condom is easy to curl when processing, does not stick to the mold, and the bending strength and hardness of the mold are significantly improved.

Embodiment 3

[0041] A kind of water-based polyurethane condom production mold, such as Figure 7As shown, it is a polytetrafluoroethylene layer 5 filled with iron powder that is fully wrapped on the outer wall of the stainless steel tube 3 for male condom production to make a hollow mold with a diameter of 33 mm for male condom production. The percentage by weight of iron powder in the polytetrafluoroethylene material layer 5 of iron powder is 2%, adopting this mold to produce diameter is the water-based polyurethane male condom of 33 millimeters, adopts direct immersion method band film drying process, this mold is dried in band film During the process, it has repeatedly withstood high and low temperature changes from 0 to 150 degrees. The water-based polyurethane condom is easy to curl when processing, and does not stick to the mold. By adding iron powder to the PTFE material, the bending strength and hardness of the mold can be improved. Significantly increased.

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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...

Claims

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Application Information

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IPC IPC(8): B29C33/40B29C70/54
Inventor 李红兰
Owner CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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