A kind of polyurethane aqueous emulsion, condom and preparation method thereof
A water emulsion, polyurethane technology, applied in the field of polymer materials, can solve the problems of low elongation, far less flexibility and high rigidity of polyurethane condoms, and achieve the effect of improving comfort and excellent mechanical strength
Active Publication Date: 2020-09-18
SICHUAN UNIV
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
However, there are also obvious defects in PU sleeves: (1) Although the strength of the material is high, the rigidity is also relatively large, and the elongation is small (generally 500% to 650%), that is, the flexibility and natural latex have a large difference. Gap (the elongation rate of natural latex is 1300%~1500%)
This shows that polyurethane condoms are still far less flexible than natural latex condoms
Method used
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Experimental program
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Embodiment 1-6
[0032]The formula of embodiment 1-6 is shown in Table 1 and Table 2, and the sign meaning wherein is as follows: PPG represents polyoxypropylene glycol, PTMG represents polytetrahydrofuran ether glycol, and PDMS represents polysiloxane glycol ( Those with * are polysiloxane diamines), PB stands for polybutadiene diol, and the numbers behind all these symbols represent molecular weight (such as PTMG-2000); PNB is poly(butadiene acrylonitrile) diol, such as PNB18-1000, wherein 18 means that the mass percentage of acrylonitrile chains is 18%, and 1000 means that its molecular weight is 1000. The remaining symbols represent the corresponding small molecules, where DMPA is dimethylolpropionic acid, DMBA is dimethylolbutyric acid, IPDI is isophorone diisocyanate, HDI is hexamethylene diisocyanate, H 12 MDI is dicyclohexylmethane diisocyanate, LDI is ethyl lysine diisocyanate, TDI is toluene diisocyanate, and MDI is diphenylmethane diisocyanate.
[0033] Table 1
[0034]
[0035...
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Abstract
The invention provides a polyurethane aqueous emulsion, a condom and a preparation method thereof. The preparation method of the polyurethane aqueous emulsion comprises the following steps: firstly, performing a prepolymerization reaction by a mixture of 50 to 65 mass parts of polyether diol and 3 to 20 mass parts of hydrophobic polymer diol or diamine and 15 to 30 mass parts of diisocyanate whichare subjected to high-temperature vacuum dehydration; secondly, performing a reaction on the obtained product and a small molecule diol chain extender, a chain extender with carboxyl and a chain extender with a alkyl side chain, and adding an organic solvent to dilute; then adding the obtained product into deionized water containing an amine chain extender to carry out stirring emulsification; and finally, carrying out vacuum removal of the organic solvent to obtain the polyurethane aqueous emulsion. The obtained polyurethane emulsion is prepared into the polyurethane condom by processes of die dip-coating, heating drying, crimping, vacuum drying, packaging and the like. For the condom, a thickness is smaller than 0.025mm, 100% of modulus at a definite elongation is smaller than 1.2MPa, tensile strength is greater than 25MPa, and elongation at break is greater than 1,000%.
Description
technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polyurethane aqueous emulsion containing hydrocarbon side chains and its application in polyurethane condoms. Background technique [0002] Condoms are a commonly used birth control tool and also have the function of preventing sexually transmitted diseases. The most widely used condoms are still natural latex condoms. This kind of condom adopts natural latex as the matrix, adds rubber additives such as anti-aging agent, accelerator and vulcanizing agent, and is processed and shaped through heat vulcanization. It has the advantages of high elasticity and good flexibility, and can be more effective in contraception and prevention of sexually transmitted diseases. But there are also obvious shortcomings, mainly including: (1) the material strength is not high enough, causing the condom to be thick (generally 0.06-0.07mm), the thermal conductivity is low, and the com...
Claims
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IPC IPC(8): C08G18/66C08G18/61C08G18/48C08G18/34C08G18/32C08G18/69C08J3/03C08J5/02C08L75/08C08L75/14A61F6/04
CPCA61F6/04C08G18/61C08G18/6674C08G18/6685C08G18/6688C08G18/6692C08G18/69C08J3/03C08J5/02C08J2375/08C08J2375/14
Inventor 谢兴益张青袁帅
Owner SICHUAN UNIV