Innoxious negative ion aqueous polyurethane and preparation method thereof

A water-based polyurethane and anionic technology, applied in the field of polyurethane, can solve the problems of product toxicity, high vapor pressure, and low solubility, and achieve the effects of improved water resistance, low vapor pressure, and regular structure

Active Publication Date: 2010-06-30
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chronic action of N-methylpyrrolidone can cause dysfunction of the central nervous system, and cause lesions of respiratory organs, kidneys and vascular systems. However, N-methylpyrrolidone has a high boiling point and is difficult to remove in the end and stays in the material. biological toxicity
Secondly, water-based polyurethane usually uses tertiary amines such as triethylamine as a neutralizing agent, and triethylamine has a strong ammonia odor and has low solubility in water. This type of water-based polyurethane will emit amine odor, which is harmful to humans during production. and the environment will cause harm, and at the same time make the product somewhat toxic
Third, most of the previous patents used aromatic isocyanates such as HDI, IPDI and TDI as raw materials. On the one hand, isocyanates such as HDI, IPDI and TDI have high vapor pressure and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add H 12 MDI235.8g and 300g PTMEG1000, add 4 drops of T12 catalyst, react at 70°C for 1 hour, heat the prepolymer to 80°C, add 28.7g of melted DMBA for 3 hours, then add 9.54g of BDO for 1 hour . Cool the prepolymer after the above chain extension reaction to 30°C, add 1388 grams of aqueous solution containing 12 grams of KOH to the prepolymer under high-speed stirring at 10,000 r / min in a FLUKE high-speed emulsification disperser, add ethylene glycol after dispersing for 20 minutes 15.4 grams of amine continued to stir and react for 20 minutes to obtain a white water-based polyurethane emulsion. The solid content of the emulsion is 30%, the DMBA content is 4.87%, the particle size is 80-110nm, the tensile strength of the film is 28MPa, and the elongation at break is 860%.

Embodiment 2

[0058] Add H 12 MDI 235.8 g and 216 g PTMEG600, add 4 drops of T12 catalyst, react at 70°C for 1 hour, heat the prepolymer to 80°C, add 24.6 g of melted DMBA for 3 hours, then add 14.9 g of BDO for 1 hour. Cool the prepolymer after the above-mentioned chain extension reaction to 30°C, add 1180 grams of aqueous solution containing 10.2 grams of KOH to the prepolymer under high-speed stirring at 10,000 r / min in a FLUKE high-speed emulsification disperser, add ethylene glycol after dispersing for 20 minutes 9.9 grams of amine continued to stir and react for 20 minutes to obtain a translucent, semi-milky white water-based polyurethane emulsion. The solid content of the emulsion is 30.5%, the DMBA content is 4.9%, the particle size is 80-100nm, the tensile strength of the film is 30.4MPa, and the elongation at break is 830%.

Embodiment 3

[0060] Add H 12 MDI235.8 g and 600 g PTMEG2000, add 4 drops of T12 catalyst, react at 80°C for 1 hour, add 35 g of melted DMBA to the prepolymer for 3.5 hours, then add 6.86 g of BDO for 1.5 hours. Cool the prepolymer after the above chain extension reaction to 30°C, add 1673 grams of aqueous solution containing 14.6 grams of KOH to the prepolymer under high-speed stirring at 10,000 r / min in a FLUKE high-speed emulsification disperser, add ethylenediamine after dispersing for 20 minutes 4.15 grams continued to stir and react for 20 minutes to obtain translucent, semi-milky white water-based polyurethane emulsion. The solid content of the emulsion is 35.2%, the DMBA content, the particle size 95-120nm, the tensile strength of the film is 24MPa, and the elongation at break is 890%.

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Abstract

The invention discloses a preparation method of innoxious negative ion aqueous polyurethane, and aqueous polyurethane prepared by the method. The method comprises the following steps: mixing dicyclohexyl methane diisocyanate and aliphatic diol according to a mol ratio of 2.5 to 4; carrying out reaction for 3 to 5 hours at 70 to 90 DEG C to obtain performed polymers; adding dimethylolbutyric acid with hydrophilic groups for taking the reaction for 3 to 5 hours; adding KOH water solution for emulsifying dispersion; and dripping diamine chain extenders for extending chains to obtain aqueous polyurethane latex emulsion. The invention adopts the aliphatic diisocyanate dicyclohexyl methane diisocyanate resin and the aliphatic polymeric diol, does not contain organic solvents such as NMP, acetone and the like often used for preparing the aqueous polyurethane, and does not contain common use neutralizing agents such as triethylamine and the like. The completely innoxious polyurethane material can be prepared, and the invention can be widely used in the fields of medical and health, food and household articles.

Description

technical field [0001] The invention relates to a method for preparing water-based polyurethane, in particular to a method for preparing non-toxic anionic water-based polyurethane and polyurethane obtained by the method. Background technique [0002] Water-based polyurethane uses water as the dispersion medium. Compared with solvent-based polyurethane, it has the advantages of non-combustibility, low odor, energy saving, and convenient operation. It has been widely used as leather finishing agent, coating and adhesive. [0003] Although compared with solvent-based polyurethane, there is still a gap in the product performance of water-based polyurethane, such as water resistance. In recent years, with people's increasing requirements for health and environmental protection and the promulgation of relevant national laws and regulations, there have been many reports on the preparation and research of waterborne polyurethane. [0004] Patents CN101003613A, CN1405196A, CN1930257...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/34C08G18/10C08G18/12C08J3/03
Inventor 王洪武黄岐善张红闫泽群乔晓东华卫琦
Owner WANHUA CHEM GRP CO LTD
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