The invention relates to a method for making a mold of waterborne polyurethane condom

- Jun 14, 2019-

Technical field:

The invention relates to a mould for the production of latex products, in particular to a mould for the production of polyurethane impregnated products, in particular to a mould for the production of water-borne polyurethane condoms.

Background technology:

Condoms are one of the most widely used contraceptives in the world.As the situation of AIDS prevention and treatment is increasingly severe, the quality of condom products has been paid more and more attention.In the existing technology, the main raw material for making condoms is natural latex, which contains many non-rubber components such as allergic water-soluble protein. If the water-soluble protein content in latex exceeds a certain amount, users' skin will suffer from allergic reactions such as erythema and pruritus, and have severe discomfort.Another aspect, the nature of the natural latex crack for 5000 to 70000 nanometers, while the volume is far less than the size of various viruses, large amount of statistical data and the results confirmed that the traditional natural latex condoms in effective contraception at the same time, while it is possible to produce certain barrier to the virus, but the failure rate is as high as 15%, is not conducive to the control of the disease.At the same time, when producing condoms with natural latex as raw materials, they must be vulcanized. In this process, condoms will produce nitrosamine, which has strong carcinogenic properties.It is affected by a variety of oil-based lubricants, in the use of condoms, carcinogen and human body fluids contact, the formation of nitrosamines DNA alkylation, the ultimate risk of cancer.Therefore, it is an inevitable trend of condom production to find a more suitable raw material to produce condoms and to replace latex condoms partially or completely.Technical personnel in the field of the late 1990 s, this had tried to be used for polyurethane condom production materials, the results show that compared with latex condoms, polyurethane condoms is non-toxic, high strength, good thermal conductivity and mantle good toughness, no special smell, no allergic reaction etc, is not sensitive to heat, wet and ultraviolet, ageing resistance performance is good, in the process of storage is not affected by the influence of various oil lubricant, not reduce the physical properties of the product itself.The screen effect of polyurethane condom is very high, no matter in static or dynamic pressure, gas, dye or HIV virus can not pass through the membrane, so it can effectively contraception and filter HIV, is a safe and comfortable condom to use.Polyurethane material is divided into water-based polyurethane and solvent polyurethane, and water-based polyurethane raw material is mainly used in the coating of water-based paint. Compared with solvent polyurethane, water-based polyurethane is more environmentally friendly and can adapt to the existing condom production equipment, which is one of the most suitable raw materials to replace natural latex.However, due to the large difference between polyurethane material and natural latex, the existing technology of natural latex condom production method and mold can not adapt to the production of waterborne polyurethane condoms, the main reason is the selection of mold material.Condoms as elastic film products, generally made using direct leaching process, asking for its product type effect is good, can form a uniform thin film on the model, in the process of production should take membrane drying working skill, namely mould to repeatedly under room temperature to 150 degrees range of temperature change, and requirement for mould is very high, and is often used in the existing technology of natural rubber latex condom mold production, natural latex condom mold material is glass, pottery and porcelain, stainless steel, etc., commonly and raw materials is a kind of waterborne polyurethane with the material of strong adhesive material,It is often used as water-based paint for the production of water-based polyurethane condoms, such as glass, ceramic, stainless steel, etc., which can be bonded to the mold, causing problems such as difficult edge winding and film removal.Technical personnel in this field have tried to add weak coagulant, additive, dipping swelling agent in the production process, or do resin coating on the surface of glass, ceramics, stainless steel and other molds, but still failed to achieve the ideal demoulding effect.To sum up, the selection of mold material is the main technical issue of whether waterborne polyurethane can be successfully applied in the industrial production of condoms.

The invention content

The purpose of the invention is to provide a waterborne polyurethane condom production mold, which can repeatedly withstand high and low temperature changes, can realize the direct dip method of condom with film drying process, reduce the adhesion between the mold and the film, easy to roll edge, film off and other advantages.The technical scheme of the invention is as follows

The utility model relates to a waterborne polyurethane condom production mold, which is characterized in that it is made of teflon material.As a further improvement of the present invention, it is made of ptfe material with filler added.As a further improvement of the invention, the filler is glass fiber, and the glass fiber has a weight ratio of 5-15%.As a further improvement of the invention, the filler is the iron powder, and the weight percentage of the iron powder is 1-10%.As a further improvement of the invention, the water-borne polyurethane condom production mould is a male condom production mould.As a further improvement of the invention, the mould for male condom production is a hollow mould for male condom production.As a further improvement of the invention, the water-borne polyurethane condom production mould is a female condom production mould.As a further improvement of the invention, the female condom production mould is a hollow female condom production mould.The beneficial effect of the invention is

Teflon is a synthetic polymer material that USES fluorine to replace all hydrogen atoms in polyethylene. It is commonly referred to as "non-stick coating" or "woul-easy material". Teflon has the following characteristics: 1.2. Low temperature resistance -- good mechanical toughness;5% elongation is maintained even when the temperature drops to _196°C.3, corrosion resistance -- for most chemicals and solvents, showing inert, strong acid and alkali resistance, water and various organic solvents.4. Weather resistance -- the best aging life in plastics.5. High lubrication -- the lowest friction coefficient among solid materials.6. Non-adhesion -- it is the minimum surface tension of solid materials and does not adhere to any material.7. Non-toxic -- with physiological inertia, no adverse reactions after long-term implantation of artificial blood vessels and organs.Because the ptfe has more excellent excellent comprehensive performance, the existing technology of ptfe is usually used for high and low temperature resistance, corrosion resistant materials, insulation materials, anti-sticking coating, etc., and the invention to overcome the existing technology of ptfe has been limited to the use of technology, using polytetrafluoroethylene as waterborne polyurethane condoms processing production with mould material is qualitative, produced by its processed into condom use mould can completely meet the direct leaching process of the production of the waterborne polyurethane condoms with membrane drying process requirement, reduce the adhesiveness between the mould and film,Thus solved the water - borne polyurethane condom film edge, the film difficult problem.The wear resistance, creep resistance, thermal conductivity and bending elastic modulus of the mold were greatly improved by adding filler in ptfe, and the compressive strength, compression modulus, bending strength and hardness were also significantly increased.Made into a hollow mold, can reduce the weight of the mold, save materials, adapt to the existing condom production equipment and tooling requirements.

Right to ask

The utility model relates to a waterborne polyurethane condom production mold, which is characterized in that it is made of teflon.

The utility model relates to a mold for the production of water-based polyurethane condoms, characterized in that it is made of teflon material with filler.

3. According to the mold for the production of water-based polyurethane condoms mentioned in claim 2, its feature is that the filler is glass fiber, and the weight percentage of glass fiber is 5-15%.

4. According to the mold for the production of waterborne polyurethane condoms mentioned in claim 2, its characteristic is that the filler is iron powder, and the weight percentage of the iron powder is 1_10%.

5. The mold for the production of water-based polyurethane condoms mentioned in claim 3 or 4 is characterized by that the mold for the production of water-based polyurethane condoms is the mold for the production of male condoms.

6. According to the mold of waterborne polyurethane condom production mentioned in claim 5, its feature lies in that the mold of male pregnancy protective condom production is hollow male condom production mold.

7. According to the mold of water-based polyurethane condom production mentioned in claim 4, its feature is that the mold of water-based polyurethane condom production is the mold of female condom production.

8. According to the mold of water-borne polyurethane condom production mentioned in claim 7, its feature lies in that the mold of female pregnancy protective cover production is hollow female condom production mold.

The full paper

The invention relates to a waterborne polyurethane condom production mould.It's made of teflon, it can be made of pure teflon, it can be made of teflon with glass fiber added, or it can be made of teflon with iron powder added.It can withstand the change of high and low temperature repeatedly, can realize the condom direct dip method with film drying process, reduce the adhesion between the mold and the film, has the advantage of film easy to roll edge, not mucous membrane.

避孕套20