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Polyisocyanate composition with long-term storage stability and preparation method thereof

A polyisocyanate, storage stability technology, applied in the direction of coating, can solve the problem of lack of research reports and effective solutions, affecting the downstream application of products, etc., to achieve the effect of improving storage stability

Active Publication Date: 2022-08-05
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors found in the evaluation of existing products on the market that most of the isocyanate compositions will produce white flocs of different severity during long-term storage (period is 5-6 months, room temperature). Downstream applications affecting the product
[0005] Aiming at the problem of flocs appearing in the isocyanate composition during long-term storage, there are so far no relevant research reports and effective solutions

Method used

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  • Polyisocyanate composition with long-term storage stability and preparation method thereof
  • Polyisocyanate composition with long-term storage stability and preparation method thereof
  • Polyisocyanate composition with long-term storage stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 500 g of TDI 80 were weighed in a round bottom flask, preheated to 60°C and kept stirring. Then, polyols, 67 g of trimethylolpropane, 22 g of 1,4-butanediol, and 19 g of 1,2-propanediol, were simultaneously added thereto, and the reaction temperature was controlled to be 60° C., and the reaction was continued for 3 hours. When the mass percentage of NCO was detected to be 16-18%, 4.2 g of absolute ethanol (r=0.037) was added, and the reaction was continued for 2 hours, and the reaction temperature was controlled to be 60° C. to obtain a pre-product. The pre-product is separated and processed by a secondary thin film evaporator to separate excess monomers. The operating conditions are: the feed temperature is 80°C, the feed rate is 1kg / h, the primary separation temperature is 165°C, and the primary absolute pressure is 125Pa , the secondary separation temperature is 165°C, and the secondary absolute pressure is 3Pa. The secondary heavy components are collected, and ethy...

Embodiment 2

[0060] 500 g of TDI 80 were weighed in a round bottom flask, preheated to 60°C and kept stirring. Then, polyols, 67 g of trimethylolpropane, 22 g of 1,4-butanediol, and 19 g of 1,2-propanediol, were simultaneously added thereto, and the reaction temperature was controlled to be 40° C., and the reaction was continued for 3 hours. When the mass percentage content of NCO was detected to be 16-18%, 10.2 g of absolute ethanol (r=0.089) was added, and the reaction was continued for 2 hours, and the reaction temperature was controlled to be 70° C. to obtain a pre-product. The pre-product is separated and processed by a secondary thin film evaporator to separate excess monomers. The operating conditions are: the feed temperature is 80°C, the feed rate is 1kg / h, the primary separation temperature is 165°C, and the primary absolute pressure is 125Pa , the secondary separation temperature is 165°C, and the secondary absolute pressure is 3Pa. The secondary heavy components are collected,...

Embodiment 3

[0062] 500 g of TDI 80 were weighed in a round bottom flask, preheated to 60°C and kept stirring. Then, polyols, 67 g of trimethylolpropane, 22 g of 1,4-butanediol, and 19 g of 1,2-propanediol, were simultaneously added thereto, and the reaction temperature was controlled at 80° C., and the reaction was continued for 3 hours. When the mass percent content of NCO was detected to be 16-18%, 0.42 g of absolute ethanol (r=0.0037) was added, and the reaction was continued for 2 hours, and the reaction temperature was controlled to be 40° C. to obtain a pre-product. The pre-product is separated and processed by a secondary thin film evaporator to separate excess monomers. The operating conditions are: the feed temperature is 80°C, the feed rate is 1kg / h, the primary separation temperature is 165°C, and the primary absolute pressure is 125Pa , the secondary separation temperature is 165°C, and the secondary absolute pressure is 3Pa. The secondary heavy components are collected, and ...

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Abstract

The invention discloses a polyisocyanate composition with long-term storage stability and a preparation method thereof. The proportion of ester groups is 0.03-5%, preferably 0.12-2.96%. In the present invention, a two-stage urethanization reaction process is designed by using polyhydric alcohol and monohydric alcohol respectively. The proportion of groups is 0.03-5%, which solves the phenomenon that flocs are easily precipitated during long-term storage of the product, and improves the storage stability of the product.

Description

technical field [0001] The present invention relates to a polyisocyanate composition, in particular to a polyisocyanate composition with long-term storage stability and a preparation method thereof. Background technique [0002] Two-component polyurethane resin curing agent is generally prepared by the curing reaction of NCO-terminated polyisocyanate prepolymer with polyester, polyether, alkyd and epoxy resin. It is widely used in coatings, adhesives, inks and other fields. The polyisocyanate prepolymer can be prepared by reacting at least one diisocyanate with at least one polyol, but the stability of the product is easily affected by external factors (such as ambient temperature, humidity, etc.), and it is easy to be stored during storage. Form flocs. [0003] The prior art addresses the above-mentioned problems in order to prolong the storage period of polyisocyanate prepolymers. For example, the published patent CN110078889A purifies the monomer raw material toluene di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/12C08G18/32C08G18/30C08G18/82
CPCC08G18/12C08G18/3206C08G18/82C08G2150/00C08G2170/00C08G18/282
Inventor 陈立樟王玉启张晓鹏王丹杨洗张谦尚永华黎源
Owner WANHUA CHEM GRP CO LTD