Polyether modified polyurethane curing agent and preparation method thereof

A polyurethane curing agent and polyether modification technology, applied in polyurea/polyurethane coatings, coatings, primers, etc., can solve problems such as cracking, prevent cracking of the paint film, facilitate product performance balance, and excellent flexibility. Effect

Active Publication Date: 2021-12-03
CARPOLY CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when the existing curing agent is used in extreme application fields such as high-powder-content primers and fast-drying high-hardness topcoats, it is prone to cracking quality problems under extreme construction conditions such as low-temperature construction and thick coating in winter

Method used

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  • Polyether modified polyurethane curing agent and preparation method thereof
  • Polyether modified polyurethane curing agent and preparation method thereof
  • Polyether modified polyurethane curing agent and preparation method thereof

Examples

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preparation example Construction

[0038] The present invention also provides a kind of preparation method of above-mentioned polyether modified polyurethane curing agent, comprises the steps:

[0039] Mix the polyether, trimethylolpropane, toluene diisocyanate, a part of the auxiliary agent and the solvent to obtain a mixture A;

[0040] Heat up the mixture A at a temperature of 65°C±5°C, keep it warm for 1h-1.5h, continue to raise the temperature at a temperature of 75°C±5°C, keep it warm for 2h-3h, and obtain a mixture B;

[0041] When the content of NCO in the system is 11-14, add a part of the auxiliary agent and solvent to the mixture B to obtain the mixture C;

[0042] When the content of NCO in the system is 7-10, add a part of the auxiliary agent and solvent to the mixture C to obtain the mixture D;

[0043] Add a part of the auxiliary agent and solvent to the mixture D, and cool down to obtain the mixture.

[0044] The invention imparts excellent flexibility to the modified curing agent by introducing...

Embodiment 1

[0054] This embodiment provides a polyether modified polyurethane curing agent, which consists of the following components by weight:

[0055] 25 parts of polyether, 1.9 parts of trimethylolpropane; 25.0 parts of toluene diisocyanate; 20 parts of sec-butyl acetate; 3.65 parts of ethyl acetate; 0.15 parts of antioxidant stabilizer; 0.04 parts of catalyst; 0.028 parts of terminator; water absorbing agent 0.1 part; 24.132 parts of esters in dilute solvent, including 16.132 parts of sec-butyl acetate and 8.0 parts of dimethyl carbonate in the dilute solvent of esters;

[0056] The polyether is compounded by a difunctional polyether: a trifunctional polyether in a mass ratio of 6:4;

[0057] The difunctional polyether is DL-2000D of Shandong Bluestar Dongda Chemical Industry, the hydroxyl value is 54mgKOH / g-58mgKOH / g, and the number average molecular weight is 2000g / mol;

[0058] The trifunctional polyether is DV-125 produced by Shandong Bluestar Dongda Chemical Co., Ltd., the hyd...

Embodiment 2

[0067] This embodiment provides a polyether modified polyurethane curing agent, which consists of the following components by weight:

[0068] 18 parts of polyether; 2.1 parts of trimethylolpropane; 30.0 parts of toluene diisocyanate; 20 parts of sec-butyl acetate; 3.65 parts of ethyl acetate; 0.15 parts of antioxidant stabilizer; 0.06 parts of catalyst; 0.04 parts of terminator; 0.1 part; 25.9 parts of esters in dilute solvent, comprising 17.9 parts of sec-butyl acetate and 8.0 parts of dimethyl carbonate in the dilute solvent of esters;

[0069] The polyether is compounded from difunctional polyether: trifunctional polyether at a mass ratio of 5:5;

[0070] The difunctional polyether is DL-400 of Shandong Bluestar Dongda Chemical Industry Co., Ltd., the hydroxyl value is 270mgKOH / g-290mgKOH / g, and the number average molecular weight is 400g / mol;

[0071] The trifunctional polyether is DV-125 produced by Shandong Bluestar Dongda Chemical Co., Ltd., the hydroxyl value is 440 ...

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Abstract

The invention relates to a polyether modified polyurethane curing agent and a preparation method thereof. The curing agent includes the following components by weight: 9-25 parts of polyether; 1.5-6.5 parts of trimethylolpropane; 25-40 parts of toluene diisocyanate; 32-65 parts of solvent; 0.2-0.64 parts of auxiliary agent; The ether is compounded by a difunctional polyether and a trifunctional polyether at a mass ratio of 2:8 to 8:2. The invention uses a specific polyether-modified polyurethane curing agent to directly and effectively improve the flexibility of the paint film by increasing the flexibility at the cross-linking and bridging points of the paint film. The polyether-modified polyurethane curing agent provided by the invention has excellent flexibility, and can also prevent cracking of the paint film under extreme construction conditions such as low-temperature construction and thick coating in winter, and can be applied to primers with high powder content And extreme applications such as quick-drying high-hardness topcoats.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to a polyether-modified polyurethane curing agent and a preparation method thereof. Background technique [0002] The two-component polyurethane curing agent contains active NCO groups, which can cross-link with paint components containing active hydroxyl groups to form paint films with various properties. The general two-component polyurethane curing agent is synthesized by using trimethylolpropane (TMP) and toluene diisocyanate (TDI) through a specific formula and process reaction. It is the most produced and widely used type of curing agent in China. As a bridging agent, more emphasis is placed on providing hardness for the paint film, and less research has been done on polyurethane curing agents that modify flexibility. [0003] With the continuous refinement of market demand, the requirements for product cost performance are getting higher and higher. When the existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C09D175/04C09D5/00
CPCC08G18/3206C08G18/4812C08G18/6677C09D5/002C09D175/04
Inventor 钟永贤谭沃元
Owner CARPOLY CHEM GRP
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