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Alkylated glass mold for producing waterborne polyurethane condoms and waterborne polyurethane condom production method

A technology of water-based polyurethane and glass moulds, which can be applied to household appliances, other household appliances, applications, etc., can solve the problems of large-scale industrial production without practical significance, and achieve the effect of mature production technology, easy curling, and simple process

Inactive Publication Date: 2017-03-29
LANZHOU KETIAN HEALTH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyethylene / polypropylene molds can successfully prepare water-based polyurethane condoms in the laboratory, they have no practical significance in large-scale industrial production

Method used

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  • Alkylated glass mold for producing waterborne polyurethane condoms and waterborne polyurethane condom production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Alkylation of glass molds: commercially available natural latex condom glass molds were soaked in cleaning solution for 2 hours, rinsed with distilled water, dried at 110°C, and then immersed in hexamethyldisilamine with a concentration of 10wt%. Alkanes in chloroform solution, soaked at room temperature for 12 hours, taken out, rinsed with chloroform, and then dried at 110°C to obtain an alkylated glass mold, which was used to determine the detection liquid with known surface energy parameters by contact angle measurement (two Sub-distilled water, glycerin, formamide, diiodomethane, ethylene glycol) on the mold surface contact angle, using Young's equation to calculate its surface energy as 34 mJ / m 2 , for specific operations, please refer to "Measurement of Surface Energy of Polymer Materials by Contact Angle Method", Wang Hui et al., Journal of Central South University (Natural Science Edition), 2006, Volume 37, Issue 5.

Embodiment 2

[0034] Alkylation of glass molds: commercially available natural latex condom glass molds, soaked in cleaning solution for 2 hours, rinsed with distilled water, dried at 110°C, and then immersed in dimethyldichlorosilane with a concentration of 10wt%. chloroform solution, soaked at room temperature for 12 hours, taken out, rinsed with chloroform, and then dried at 110 ° C to obtain an alkylated glass mold, which was used to measure the detection liquid with known surface energy parameters by contact angle measurement (secondary The contact angle of distilled water, glycerin, formamide, diiodomethane, ethylene glycol) on the surface of the mold, the surface energy calculated by Young's equation is 35 mJ / m 2 .

Embodiment 3

[0036] Surface tension adjustment of water-based polyurethane: first add thickener, defoamer, film-forming aid, etc. to commercially available 35% water-based polyurethane according to conventional dosage to make water-based polyurethane emulsion, and then add 0.2wt% polyether to the emulsion Modified siloxane (BYK-310) (U.S. FDA 21 CFR (Food and Drugs) Section 175.300 allows use in indirect food additives, coatings and adhesives in contact with food) to adjust the surface tension of the emulsion. The surface tension of the liquid water-based polyurethane emulsion was determined by the pull-off method to be 32 mN / m.

[0037] Water-based polyurethane condom molding process: directly immerse the alkylated glass mold prepared in Example 1 into the above-mentioned water-based polyurethane emulsion, lift it out at a slow speed, rotate the mold to keep the coating even, transfer it to the drying tunnel for drying, and if necessary, carry out two One or more times of direct immersion...

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Abstract

The invention discloses an alkylated glass mold for producing waterborne polyurethane condoms. The alkylated glass mold is obtained by conducting alkylating treatment on the surface of a glass mold by adopting an alkylating agent. A method for producing waterborne polyurethane condoms by utilizing the alkylated glass mold comprises the steps that 1, a surface tension regulating agent is added to a waterborne polyurethane emulsion to regulate the surface tension of the waterborne polyurethane emulsion to reach 25-35 mN / m; 2, the alkylated glass mold is immersed into the waterborne polyurethane emulsion in the step 1 and then is taken out, and drying, edge curling and mold release are performed to obtain the waterborne polyurethane condoms. An existing mature glass mold for natural latex condoms can be directly adopted to perform surface modification, the glass mold is low in cost, surface alkylating operation is simple, a coating is durable, and mold release and edge curling of the alkylated glass surface become easy after glue film drying. It is proved through practice that industrialized production of the waterborne polyurethane condoms can be achieved, and the process is stable.

Description

technical field [0001] The invention belongs to the field of contraceptives, and in particular relates to an alkylated glass mold used for the production of water-based polyurethane condoms and a method for producing water-based polyurethane condoms using the mold. Background technique [0002] Condoms are currently the most widely used devices for contraception and prevention of sexually transmitted diseases in the world. Among the existing products, they are mainly made of natural latex, but natural latex condoms have allergic reactions; residual nitrosamines cause cancer risks; there are micropores Poor virus isolation effect; poor user experience due to film thickness. That's why the Bill & Melinda Gates Foundation is funding the development of a new generation of condoms with high profile funding. [0003] The water-based polyurethane condom is non-toxic and non-allergic, has high strength, good thermal conductivity, and good virus isolation effect. It can prepare 0.01...

Claims

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Application Information

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IPC IPC(8): B29C41/14B29C41/40B29C33/38B29K75/00B29L31/00
CPCB29C41/14B29C33/38B29C41/40B29K2075/00B29L2031/7538
Inventor 王武生郭文鹤戴家兵李维虎
Owner LANZHOU KETIAN HEALTH TECH CO LTD
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