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Multi-curing polyurethane latent curing agent and preparation method thereof

A latent curing agent and multiple curing technology, applied in the field of curing agent, can solve problems such as coating defects, coating hardness is not too high, too late to release, etc., to achieve high hardness and chemical corrosion resistance, excellent water resistance and solvent corrosion resistance Effect

Pending Publication Date: 2021-06-04
韶关东森合成材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the latent curing agent defect of this structure is: it is often affected by the environment, the drying is slow at low temperature and low humidity, and the time cost of consumption is too high; while at high temperature and high humidity and water in the air The reaction is too fast, the produced CO 2 Too late to release, easy to cause coating defects
In addition, the hardness of the fully cured coating is often not too high, and it is difficult to meet some places with special hardness requirements.

Method used

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  • Multi-curing polyurethane latent curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A multi-curing polyurethane latent curing agent, its raw materials include toluene diisocyanate, polyether polyol, polyester polyol, trimethylolpropane, and hydroxyethyl acrylate.

[0027] The preparation method of above-mentioned multiple curing polyurethane latent curing agent, comprises the steps:

[0028] S1. In parts by mass, 38 parts of toluene diisocyanate are dissolved in 25 parts of butyl acetate to form a mixture;

[0029] S2. Under the condition of 60°C, in parts by mass, 15 parts of polyether polyol and 12 parts of polyester polyol were added in batches to the mixture, reacted for 2 hours, and intermediate product 1 was obtained;

[0030] S3. Under the condition of 60°C, according to the number of parts by mass, 7.7 parts of trimethylolpropane were added in batches to the intermediate product 1, and reacted for 2 hours to obtain the intermediate product 2;

[0031] S4. Under the condition of 60°C, by mass parts, 2.5 parts of hydroxyethyl acrylate were added...

Embodiment 2

[0034] A multi-curing polyurethane latent curing agent, the raw materials of which include diphenylmethane diisocyanate, polyester polyol, trimethylol propane and hydroxyethyl methacrylate.

[0035] The preparation method of above-mentioned multiple curing polyurethane latent curing agent, comprises the steps:

[0036] S1. In parts by mass, 46 parts of diphenylmethane diisocyanate are dissolved in 30 parts of butyl acetate to form a mixture;

[0037] S2. Under the condition of 70° C., in parts by mass, 15 parts of polyester polyol was added in batches to the mixture, reacted for 2 hours, and intermediate product 1 was obtained;

[0038] S3. Under the condition of 70°C, according to the number of parts by mass, 6.2 parts of trimethylolpropane were added in batches to the intermediate product 1, and reacted for 2 hours to obtain the intermediate product 2;

[0039] S4. Under the condition of 70°C, according to the number of parts by mass, add 1 part of hydroxyethyl methacrylate...

Embodiment 3

[0042] A multi-curing polyurethane latent curing agent, the raw materials of which include toluene diisocyanate, polyether polyol, polyester polyol, trimethylolpropane, and hydroxypropyl acrylate.

[0043] The preparation method of above-mentioned multiple curing polyurethane latent curing agent, comprises the steps:

[0044] S1. In parts by mass, 40 parts of toluene diisocyanate is dissolved in 20 parts of butyl acetate to form a mixture;

[0045] S2. Under the condition of 65°C, in parts by mass, 13 parts of polyether polyol and 15 parts of polyester polyol were added in batches to the mixture, reacted for 2 hours, and intermediate product 1 was obtained;

[0046] S3. Under the condition of 65°C, in parts by mass, 2.3 parts of 1,4-butanediol were added in batches to the intermediate product 1, and reacted for 2 hours to obtain the intermediate product 2;

[0047] S4. Under the condition of 65° C., in parts by mass, 3 parts of hydroxypropyl acrylate were added to the interme...

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Abstract

The invention relates to a multi-curing polyurethane latent curing agent. The multi-curing polyurethane latent curing agent is prepared from the following raw materials: diisocyanate, polymer polyol, a multi-hydroxyl monomer and hydroxyl-containing acrylate, the polyhydroxy small molecules are selected from one or more of trimethylolpropane, trimethylolethane, trimethylolmethane, 1,4-butanediol, 1,3-propylene glycol and 1,5-pentanediol. The invention also discloses a preparation method of the multi-curing polyurethane latent curing agent. The multi-curing polyurethane latent curing agent disclosed by the invention has relatively high hardness and chemical corrosion resistance after being cured, and has excellent water resistance, solvent corrosion resistance and wiping resistance.

Description

technical field [0001] The invention belongs to the field of curing agents, in particular to a multi-curing polyurethane latent curing agent and a preparation method thereof. Background technique [0002] Most of the polyurethane latent curing agents currently on the market are characterized by the reaction of diisocyanate monomers and polyether polyesters containing active hydrogen, followed by chain extension of small molecular weight polyols, and the use of isocyanate radicals during application. It reacts with water in the air to form urea bonds, which endows the paint film with good flexibility, scratch resistance and strength. However, the latent curing agent defect of this structure is: it is often affected by the environment, the drying is slow at low temperature and low humidity, and the time cost of consumption is too high; while at high temperature and high humidity and water in the air The reaction is too fast, the produced CO 2 If it is too late to release, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/67C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08G18/10
CPCC08G18/7614C08G18/7671C08G18/672C08G18/6611C08G18/4018C08G18/48C08G18/42C08G18/6644C08G18/6607C08G18/12C08G18/10C08G18/3206
Inventor 周俊锋
Owner 韶关东森合成材料有限公司
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