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Poly(propylene carbonate)-based water-borne polyurethane adhesive and preparation method thereof

A polypropylene carbonate-based water-based, polyurethane adhesive technology, applied in the field of fine chemicals, can solve the problems of poor hydrolysis resistance, good water resistance, yellowing of polyurethane, etc., achieve good comprehensive application performance, improve hydrolysis resistance, The effect of good adhesion and water resistance

Inactive Publication Date: 2011-11-16
JIANGSU ZHONGKE JINLONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the isocyanate raw materials used in the representative water-based polyurethanes on the market are toluene diisocyanate (TDI) and isophorone diisocyanate (IPDI). Color coating glue or glue for transparent printing, the polyurethane corresponding to the latter has better comprehensive performance but its price is more expensive
Macromolecular polyol is another important raw material for synthesizing polyurethane. Among them, polyether polyol is relatively cheap, and its corresponding water-based polyurethane products have moderate adhesion, but good water resistance; polyester polyols are relatively expensive, and their corresponding water-based polyurethane products The product has good adhesion, but poor hydrolysis resistance; the corresponding product of polycarbonate polyol has the best overall performance, but its price is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 100 g of polypropylene carbonate diol with a molecular weight of 3500 into the reaction kettle, vacuumize and dehydrate at 100°C for 1 hour, and cool down to 40°C;

[0034] (2) 18.5g of isophorone diisocyanate IPDI, 2.3g of dimethylolpropionic acid and 0.2g of catalyst dibutyltin dilaurate were added to the reaction system under the protection of nitrogen, and after stirring evenly, the temperature was raised to 80°C. Insulation reaction for 3h;

[0035] (3) Add 1.03g of ethylenediamine to the reactor for chain extension for 30min;

[0036] (4) Cool down the reaction kettle to 30°C, add 6.5g of γ-aminopropyltriethoxysilane KH-550 and stir for 30 minutes;

[0037] (5) Cool down the reaction kettle to 40°C, add 1.74g of triethylamine for neutralization and stirring for 15 minutes, add 130g of deionized water for vigorous stirring and emulsification for 15 minutes;

[0038] (6) Discharging and packaging to obtain the product.

Embodiment 2

[0040] (1) Add 100 g of polypropylene carbonate diol with a molecular weight of 3500 into the reaction kettle, vacuumize and dehydrate at 100°C for 1 hour, and cool down to 40°C;

[0041] (2) 16.62g of toluene diisocyanate, 3.75g of dimethylolpropionic acid and 0.1g of catalyst dibutyltin dilaurate are added to the reactor under the protection of nitrogen, and the temperature is raised to 70°C for 3 hours. The increase of system viscosity, add 20g acetone to adjust the viscosity of reaction system;

[0042] (3) Add 1.54g of 1,4-butanediol chain extension in the reactor, and the reactor is heated to 80 o C reacted for 2 hours;

[0043] (4) Cool down to 20 o C, adding 4.98g of N-β-aminohexyl-γ-aminopropylmethyldimethoxysilane 602 for 30min;

[0044] (5) The reaction kettle was heated to 40°C, 2.83g of triethylamine was added to the reaction kettle for neutralization and stirring for 15 minutes, and 130g of deionized water was added for vigorous stirring and emulsification for...

Embodiment 3

[0047] (1) Add 100 g of polypropylene carbonate diol with a molecular weight of 3500 into the reaction kettle, vacuumize and dehydrate at 100°C for 1 hour, and cool down to 40°C;

[0048] (2) 24.88g of 4,4'-diphenylmethane diisocyanate MDI, 4.02g of 1,2-dihydroxy-3-propanesulfonic acid and 0.15g of dibutyltin dilaurate were added to the reaction under the protection of nitrogen In the still, heat up to 70°C and keep warm for 3 hours. During the reaction process, according to the increase of the viscosity of the system, add 30g of N-methylpyrrolidone to adjust the viscosity of the reaction system;

[0049] (3) Add 2.7g of 1,6-hexanediol in the reactor, and the reactor is heated to 80 o C reacted for 2 hours;

[0050] (4) Cool down to 5-30 o C, adding 3g of 3-glycidyloxypropyltrimethoxysilane KH-560 to react for 30min;

[0051] (5) The reaction kettle was heated to 40°C, 3.03g of ammonia water was added to the reaction kettle for neutralization and stirring for 15 minutes, and ...

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Abstract

The invention relates to a poly(propylene carbonate)-based water-borne polyurethane adhesive and a preparation method thereof. The water-borne polyurethane adhesive is prepared from a polymer of carbon dioxide and propylene epoxide, namely poly(propylene carbonate)polyols, chain extender and polyisocyanate; and the water resistance of the water-borne polyurethane adhesive is improved by modifying or mixing a silane coupling agent. The water-borne polyurethane adhesive is obtained by pre-polymerizing (a) and (b), extending the chain through (c) and (d) and modifying and mixing through (e) as follows: (a) 10-30 parts of aromatic diisocyanate, (b) 100 parts of poly(propylene carbonate)polyols, (c) 1-5 parts of chain extender capable of forming hydrophilic groups and having active hydrogen, (d) 0-2 parts of chain extender having active hydrogen and (e) 1-8 parts of silane coupling agent. The poly(propylene carbonate)-based water-borne polyurethane adhesive prepared by the invention has the advantages of good adhesion property to wood, glass and fabric and good hydrolysis resistance.

Description

technical field [0001] The invention relates to a preparation method of a polypropylene carbonate-based waterborne polyurethane adhesive, belonging to the field of fine chemicals. technical background [0002] Polyurethane adhesives were commercialized in Germany in the 1940s. For more than half a century, polyurethane adhesives have been widely used due to the continuous improvement of polyurethane chemical foundation, polyurethane preparation, application technology and continuous development of application fields. Introduce charged ionic groups or hydrophilic non-ionic segments on the main chain or side chain of polyurethane to make charged ionomers or hydrophilic segments, which can be emulsified in water or spontaneously dispersed in water Obtain waterborne polyurethane, which uses water as the medium, is non-toxic and non-polluting and is increasingly favored by people. [0003] Polyurethane adhesives have good adhesion to various substrates (such as plastic, metal, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/44
Inventor 徐玉华
Owner JIANGSU ZHONGKE JINLONG CHEM
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