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Water-based polyurethane elastomer emulsion, and preparation method and application thereof

A water-based polyurethane and elastomer technology, applied in the field of water-based polyurethane elastomer emulsions, can solve the problems of poor strength and high modulus, and achieve excellent mechanical properties, good hand feel, and easy penetration or removal.

Inactive Publication Date: 2012-02-22
SHANGHAI HUAMING HI TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of water-based polyurethane elastomer emulsion and its preparation method and application, to overcome the deficiency in the prior art of poor strength and high modulus after cross-linking modification

Method used

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  • Water-based polyurethane elastomer emulsion, and preparation method and application thereof
  • Water-based polyurethane elastomer emulsion, and preparation method and application thereof
  • Water-based polyurethane elastomer emulsion, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 150.6g of polyoxypropylene diol PPG-2000 (molecular weight 2000) was vacuum dehydrated at 120°C and -0.96MPa for 2h, 67.87g of isophorone diisocyanate, 17.21g of dimethylol propionic acid and 0.136g of dibutyl Tin dilaurate was reacted at 80°C for 2 hours, and 8.44 g of 1,4-butanediol was added for chain extension. The measured NCO% was 0.27 (theoretical value was 0.28), and 1.72 g of diethanolamine was added until the NCO% was 0, and the temperature was lowered. To 55°C, add 10.39g triethylamine for neutralization for 1h, add 14.84g BL3175 (a product of Bayer Company, a non-aqueous blocked polyisocyanate with a solid content of 75wt%, wherein the blocked NCO content is 8.33wt%), 620.1 g of deionized water was added under stirring, and stirred for 3 hours to obtain an aqueous polyurethane emulsion with a solid content of 30 wt%.

[0043]The mold is immersed in the coagulant liquid, and the coagulant solution is CaCl with a mass fraction of 12 wt%. 2 and 3wt% Ca(NO 3 )...

Embodiment 2

[0045] 200.67g of polyoxypropylene diol PPG-1000 was vacuum dehydrated at 120°C and -0.96MPa for 2h, 126.63g of isophorone diisocyanate, 24.04g of dimethylol propionic acid and 0.1266g of dibutyltin dilaurate React at 75°C for 3 hours, add 16.13g of 1,4-butanediol for chain extension, the measured NCO% is 0.24 (theoretical value is 0.25), add 2.31g of diethanolamine until the NCO% is 0, cool down to 50°C, Add 16.32g triethylamine and neutralize 1h, add 8.93g BI7963 (product of Bassington Chemical Company, a kind of non-aqueous blocked polyisocyanate, solid content 70wt%, wherein blocked NCO content is 6.16wt%), under stirring Add a mixture of 86.12g BI7987 (a water-based blocked polyisocyanate with a solid content of 40wt% and a blocked NCO content of 1.8wt%) and 733.9g deionized water, and stir for 3 hours to obtain a water-based polyisocyanate with a solid content of 35wt%. polyurethane emulsion.

[0046] The product preparation method is the same as that in Example 1, exce...

Embodiment 3

[0048] 160.4g of polyoxypropylene glycol PPG-2000 and 20.05g of polypropylene glycol PPG-1000 were vacuum dehydrated at 120°C and -0.96MPa for 2h, 96.80g of isophorone diisocyanate, 25.39g of dimethylol propionic acid and 0.1452 g of stannous octoate was reacted at 80°C for 2 hours, 12.23g of 1,4-butanediol was added for chain extension, and the NCO% was measured to be 0.24 (theoretical value was 0.25), and 2.54g of trimethylolpropane was added to reach the NCO% to 0, lower the temperature to 55°C, add 16.28g of triethylamine for neutralization for 1 hour, add 31.29g of BI7963, add 425.2g of deionized water while stirring, and stir for 3 hours to obtain an aqueous polyurethane emulsion with a solid content of 45wt%.

[0049] The product preparation method is the same as that in Example 1, except that it is finally dried at 125° C. for 25 minutes, and then demolded. The properties of the products obtained are shown in Table 1.

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Abstract

The invention discloses water-based polyurethane elastomer emulsion, and a preparation method and application thereof. The preparation method comprises the following steps of: (1) mixing organic diisocyanate, polyol with the molecular weight of 600-4,000, hydroxy carboxylic acid and an organotin-containing catalyst, and reacting at the temperature of between 60 and 90DEG C for 2 to 5 hours; (2) adding an active hydrogen-containing chain extender, and continuously reacting until a theoretical value of residual NCO percent is reached; (3) adding a polyhydroxy chain terminator to make the residual NCO percent equal to 0; (4) adding organic amine for neutralization reaction at the temperature of between 30 and 55DEG C, wherein the neutralization degree is 70 to 100 molar percent of hydroxy carboxylic acid; and (5) adding a crosslinking agent and water to obtain aqueous dispersion, namely the water-based polyurethane elastomer emulsion. Products prepared from the emulsion have low modulus, weak bondage feel, and high resistance to yellowing, and can be stably stored.

Description

technical field [0001] The invention relates to a water-based polyurethane elastomer emulsion, a preparation method and products made from the elastomer. Background technique [0002] Common medical gloves are generally made of natural rubber latex collected from the Hevea clover tree. It has a series of good properties, such as high internal elasticity, and good sensitivity to grasping objects, and as a An effective barrier to pathogens, germs and bacteria, natural latex gloves can also provide effective protection. [0003] But some people who wear medical gloves made of natural rubber latex have experienced allergic reactions, severe and even anaphylactic shock. The cause of this reaction and shock is the protein contained in natural rubber latex. Therefore, personnel engaged in hygiene work began to look for synthetic materials to replace natural latex to reduce the risk of allergies and shock during glove wearing. Commonly used synthetic materials that can replace na...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/34C08J5/18
Inventor 杨景辉王尧吴秋芳马新胜
Owner SHANGHAI HUAMING HI TECH GRP
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