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Alkyl side chain modified PU (polyurethane) aqueous emulsion as well as preparation method and application thereof in PU condoms

A polyurethane prepolymer and polyurethane technology, applied in the field of polymer materials, can solve the problems of far inferior flexibility, high rigidity and low elongation of polyurethane condoms, and achieve the effects of excellent mechanical strength, improved thermal conductivity and improved barrier performance.

Active Publication Date: 2019-01-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Alkyl side chain modified PU (polyurethane) aqueous emulsion as well as preparation method and application thereof in PU condoms
  • Alkyl side chain modified PU (polyurethane) aqueous emulsion as well as preparation method and application thereof in PU condoms
  • Alkyl side chain modified PU (polyurethane) aqueous emulsion as well as preparation method and application thereof in PU condoms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0033] Embodiment 1-6 does not contain the preparation of graphene oxide polyamic acid aqueous emulsion

[0034] 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, ...

Embodiment 7～9

[0045] The preparation of embodiment 7~9 containing graphene oxide polyamic acid aqueous emulsion

[0046] In this group of examples, graphene oxide (GO) was added when preparing the polyurethane aqueous emulsion, wherein Example 7 added 0.1 kg of GO with a sheet diameter of 0.5-0.8 μm, Example 8 added 0.2 kg of GO with a sheet diameter of 0.1-0.4 μm, and Example 9 Add 0.5 kg of GO with a diameter of 20-100 nm. Formulas except GO: Example 7 is the same as Example 1, Example 8 is the same as Example 2, and Example 9 is the same as Example 3. The preparation process of Examples 7-9 is the same as that described in Examples 1-6, except that the emulsification process in the third step is changed to: [3] Emulsification process: add the required GO to deionized water of the corresponding formula, and ultrasonically disperse it to obtain Suspension, then add formula amount of amine chain extender in the desuspension, then slowly add carboxylate prepolymer into the suspension, stir ...

Embodiment 10～21

[0047] The preparation of embodiment 10~21 polyurethane condoms

[0048] This group of examples utilizes the aqueous polyurethane emulsion prepared in Examples 1-9 to prepare polyurethane condoms, and the required graphene oxide formulation amount and preparation process parameters are shown in Table 4. For Examples 10-15, the prepared condom does not contain graphene oxide, and its preparation process is as follows: Examples 11 and 12 do not need to be diluted, and Example 10 and Examples 13-16 need to use deionized water to first dilute the original polyurethane aqueous emulsion Dilute to the required concentration; ultrasonically clean the glass mold in ethanol for 10 minutes, and dry; secondly, immerse the glass mold in the polyurethane aqueous emulsion for a specified time, take it out, and then heat up and dry in stages. The process parameters are shown in Table 4; for the embodiment Steps 13 and 15, after heating up to 80°C for drying, dip into the polyurethane aqueous ...

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Abstract

The invention discloses an alkyl side chain modified PU (polyurethane) aqueous emulsion as well as a preparation method and an application thereof in preparation of condoms. The preparation method ofthe PU aqueous emulsion comprises the steps as follows: firstly, high-temperature vacuum dehydration is performed on a mixture of 50-65 parts of polyether glycol and 3-20 parts of hydrophobic polymerglycol or diamine, and then an obtained mixture is subjected to a prepolymerization reaction with 15-30 parts of diisocyanate; then, a product reacts with 0-2 parts of a micromolecular glycol chain extender, 3-6 parts of a chain extender with carboxyl and 1.5-6 parts of a chain extender with alkyl side chains, and an organic solvent is added for dilution; next, the diluted reaction mixture is added to deionized water containing 0.5-3 parts of an amine chain extender and 0-0.5 parts of graphene oxide to be stirred for emulsification; finally, the organic solvent is removed in vacuum to obtain the PU aqueous emulsion. PU condoms are obtained after the obtained PU aqueous emulsion is subjected to dip-coating mold, heating drying, edge curling, vacuum drying, packaging and other procedures. The condoms have the thickness smaller than 0.025 mm, the 100% fixed elongation modulus smaller than 1.3 MPa, the tensile strength larger than 25 MPa and elongation at break larger than 1000%.

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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Application Information

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IPC IPC(8): C08G18/34C08G18/32C08G18/48C08G18/12C08G18/61C08G18/69C08G18/73C08G18/75C08G18/76C08G18/66C08K3/04C08L75/08A61F6/04
CPCA61F6/04C08G18/0823C08G18/12C08G18/348C08G18/482C08G18/4825C08G18/4854C08G18/61C08G18/6692C08G18/698C08G18/722C08G18/724C08G18/73C08G18/755C08G18/7614C08G18/7671C08K3/042C08G18/3206C08G18/3228C08G18/3275C08L75/08
Inventor 谢兴益袁帅张青
Owner SICHUAN UNIV