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Production method of polyurethane latex condom and special mold thereof

A technology of polyurethane latex and production methods, which is applied in the direction of male contraceptives, etc., can solve the problems of difficulty in adapting to the industrial production of polyurethane condoms, the complex mold processing technology of PTFE condoms, and the inability to meet the requirements of industrial production pass rate, etc., and achieve easy batch production Variety of production and molding methods, and the effect of reducing the weight of the mold

Inactive Publication Date: 2015-02-11
CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the mold materials for natural latex condoms are generally glass, ceramics, stainless steel, etc. The surface energy of polyurethane is about 43mN / m, while the surface energy of glass (70mN / m) and stainless steel (75mN / m) is too high. Polyurethane condoms will be firmly attached to the surface and bonded to the mold, making it difficult to curl and remove the film
In CN 102107473 A, polytetrafluoroethylene (PTFE) material is used to solve the demoulding problem, but the applicant has proved through experiments that the surface energy of PTFE (18.5mN / m) is too low, and polyurethane latex is prone to "slip phenomenon" during impregnation As a result, the adhesion of the condom film is incomplete, and the pass rate requirements for industrialized production cannot be reached.
Moreover, PTFE is expensive and dense (2.14~2.2g / cm3), and processing is extremely difficult, because the melting temperature of PTFE is as high as 327~342°C, and the melt viscosity is extremely high (103 Pa·s) is difficult to flow, and cannot be processed by general thermoplastic resin methods
Therefore, the processing technology of PTFE condom mold is extremely complicated. It is necessary to produce PTFE rods with suitable diameters by molding method, and then turn them into required shapes by lathe.
Obviously, turning molds with complex structures is costly, time-consuming and material-intensive, and the weight of the mold is heavy due to its high density, and the solid mold needs to be drilled to reduce the weight of a single mold, resulting in the processing cost of a single PTFE mold being ten times that of a glass mold. more than double
Therefore, PTFE molds are difficult to adapt to the industrial production of polyurethane condoms due to unfavorable factors such as easy to produce "slip phenomenon", extremely difficult processing, high cost and heavy weight.

Method used

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  • Production method of polyurethane latex condom and special mold thereof
  • Production method of polyurethane latex condom and special mold thereof
  • Production method of polyurethane latex condom and special mold thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A production method of polyurethane latex condoms, using a 60m condom production line, transporting 2,000 molds at the same time on the production line, and sequentially dipping latex (on a dipping machine, glue temperature 28~35°C)→drying (60~70°C)→rolling Side→drying (80~90℃)→water flushing demoulding→centrifugal dehydration→finishing→finished product drying→electrical inspection step, polyurethane latex is polyester water-based polyurethane with a solid content of 55%, adding thickener sodium polyacrylate 0.1 wt %, leveling agent ethylene glycol monobutyl ether 1.5 wt%, defoamer n-butanol 0.5 wt%, stir evenly, filter and stop for defoaming, use polyethylene male condom mold, condom A1, condom can be obtained The body length is 180mm±2mm, and the sleeve body width is 50mm±1mm.

[0039] The polyurethane latex condom production special-purpose mold that the present embodiment provides, as figure 1 As shown, it includes a protruding head 1, a column body 2 and a circula...

Embodiment 2

[0044] A kind of polyurethane latex condom production method, adopts 120m condom production line, transports 4500 molds simultaneously on the production line, adopts the polyether type aqueous polyurethane of solid content 45%, adds thickening agent sodium polyacrylate 0.2 wt%, leveling agent B Diol monobutyl ether 1.0 wt%, defoamer n-butanol 0.5 wt%, stir evenly, filter and park for defoaming, use polyethylene male condom mold, soak latex (glue temperature 28~35°C) → dry ( 60~70°C)→crimping→drying (80~90°C)→water flushing and demoulding→centrifugal dehydration→finishing→finished product drying→electrical inspection, condom A2 can be obtained, the length of the condom body is 180mm±2mm, and the width of the body 50mm±1mm.

[0045] The polyurethane latex condom production special-purpose mold that the present embodiment provides, as figure 2 As shown, it includes a protruding head 1, a hollow cylinder 2 and a circular clamping pad 3, and the wall thickness of the hollow cylin...

Embodiment 3

[0049] A kind of polyurethane latex condom production method, solid content 40% polyester water-based polyurethane, add thickener carboxymethyl cellulose 0.3 wt%, leveling agent ethylene glycol monomethyl ether 2.5 wt%, defoamer secondary Octanol 1.0 wt%, using a polypropylene male condom mold, dipping in latex (glue temperature 28~35°C)→drying (60~70°C)→cooling (30~40°C)→second dipping in latex (glue temperature 28°C) ~35°C)→drying (60~70°C)→crimping→drying (90~100°C)→water flushing and demoulding→centrifugal dehydration→finishing→finished product drying→electrical inspection, condom A3 and length of condom body can be obtained 180mm±2mm, the sleeve width is 52mm±1mm.

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Abstract

The invention relates to a production method of a polyurethane latex condom. The production method comprises the following steps: (A) preparing polyurethane latex, namely mixing waterborne polyurethane with the solid content being 35-55% with assistants, and stirring uniformly to obtain the polyurethane latex; and (B) forming the polyurethane latex condom with the polyurethane latex obtained in the step (A) by a condom mold, wherein the mold is manufactured by a polyolefin material which is polyethylene and / or polypropylene. The invention also provides a special mold for producing the polyurethane latex condom.

Description

technical field [0001] The invention relates to a condom, in particular to a production method of a polyurethane latex condom and a special mold thereof. Background technique [0002] Condoms are one of the most widely used contraceptives in the world. In the prior art, the main raw material for manufacturing condoms is natural latex, but natural latex condoms have the risk of sensitization and nitrosamine-induced cancer. Therefore, looking for a kind of more suitable raw material to produce condom is the inevitable trend of condom production development. [0003] Compared with natural latex condoms, polyurethane condoms have the characteristics of non-toxicity, high strength, good thermal conductivity, and no allergic reaction. They are not sensitive to heat, humidity, and ultraviolet light, and have good aging resistance. effects of oil-based lubricants. Polyurethane condoms have extremely high barrier efficacy, can effectively prevent pregnancy and filter HIV, and are...

Claims

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Application Information

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IPC IPC(8): B29C33/00A61F6/04
Inventor 欧阳维肖迪娥李红兰张雅妮
Owner CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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