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Method for preparing condom by using polyisoprene rubber latex

A polyisoprene and condom technology, applied in the coating and other directions, can solve the problems that the tensile strength of the condom does not meet the requirements and the production cost is high

Active Publication Date: 2013-03-20
SHANGHAI MINGBANG RUBBER PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, in the process mentioned in US6618861, the tensile strength of the prepared condom cannot meet the requirements. In the method disclosed in WO2007 / 113463, the temperature conditions are relatively harsh in all stages until the vulcanization period. In the current production process In , it is difficult to fully satisfy or the production cost of satisfying the condition is very high

Method used

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  • Method for preparing condom by using polyisoprene rubber latex
  • Method for preparing condom by using polyisoprene rubber latex
  • Method for preparing condom by using polyisoprene rubber latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A typical recipe is as follows:

[0031]

Embodiment 2

[0033] A specific example of the formulation according to Example 1 is as follows:

[0034]

[0035]

[0036] In the above table, the percentages in the "ingredients" column are the concentration of the aqueous solution of the ingredients, that is, the mass percentage of the solute contained in the solution per unit mass.

Embodiment 3

[0038] A kind of method that adopts polyisoprene latex to prepare condom, comprises the following steps:

[0039] S1: Mix the polyisoprene latex with the ingredients in Example 1, stir at a low speed (30-60 rpm) at 20-26°C for 24 hours, and control the total solid content at 49% during the mixing process, When the pH value is 10.5, the mixed latex is obtained, and the mixed latex is parked and matured for 5 days;

[0040] S2: Under the condition of 20-26°C, dip the condom mold with a suitable shape in the mixed latex after parked and matured for the first time, take out the condom mold and dry it at 80-95°C for 5 -10 minutes, until the film on the condom mold is transparent, then do the second impregnation at 20-26°C, and then dry at 80-95°C for 5-10 minutes until the condom mold is on The film is transparent;

[0041] S3: After conventional crimping, drying, swelling, mold removal, soaking, powdering, and dehydration, the film on the condom mold is dried and vulcanized at a...

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Abstract

The invention discloses a method for preparing condom by using a polyisoprene rubber latex. The method comprises the steps of mixing the polyisoprene rubber latex and a proper amount of mixed component at the temperature of 20-26 DEG C to obtain a mixed latex, controlling a total solid content within 48-52% and a pH value of 10.3-10.8 during the mixing process, and standing the latex for ripening; immersing a condom mould with a proper shape in the mixed latex ripened in the step S1, and taking out the immersed condom mould and drying at the temperature of 80-90 DEG C, so as to form an adhesive film on the immersed condom mould; performing treatment of regular rolled hem, drying, swelling, removing the mould, foaming and powdering and dehydrating on the adhesive film formed on the immersed condom mould, and drying and vulcanizing the adhesive film at the temperature of 105-115 DEG C to form the condom. The obtained condom can reach required tensile strength and elongation with no need of mixing the polyisoprene rubber latex at a low temperature and immersing the condom mould.

Description

technical field [0001] The invention relates to a method for preparing a condom, in particular to a method for preparing a condom by using polyisoprene latex. Background technique [0002] Most of the condoms currently on the market are made of natural latex, and its main component is cis-1,4-polyisoprene. However, condoms made from natural latex can cause many health problems. Natural latex contains proteins and other substances that are allergic to the human body. Therefore, it is imminent to find alternatives to natural latex, and various synthetic materials have been used as substitutes for natural latex. For example, polyurethane has also been used as a substitute for natural latex and has been used in the production of condoms, but polyurethane has very high tensile strength, does not have the resilience and low tensile set value of natural latex. Although it has been improved in recent years, it still cannot reach the resilience and low tensile set value of natural...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/14B29C41/52
Inventor 朱正君潘青青蔡启杰
Owner SHANGHAI MINGBANG RUBBER PROD
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