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Polyurethane latent curing agent, one-component polyurethane waterproof coating and preparation method thereof

A polyurethane curing agent and polyurethane waterproof technology, applied in the field of architectural waterproof coatings, can solve the problems of poor storage performance of finished coatings, shrinkage cavities, pinholes, dark bubbles, and high application costs, and achieve short reaction time, low reaction conditions, and high application costs. Apply low-cost effects

Active Publication Date: 2019-01-22
重庆科顺新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main types of one-component polyurethane waterproof coatings: moisture curing type and latent curing type. During the drying process of the coating film, the moisture curing type high-performance one-component polyurethane waterproof coating, due to the -NCO group on the moisture Highly sensitive to gas, it is easy to produce defects such as shrinkage cavities, pinholes, and dark bubbles in the coating film. However, latent curing agents usually used in latent-curing high-performance one-component polyurethane waterproof coatings often have a large amount of latent curing agents, high application costs, and Disadvantages of poor storage performance of finished coatings

Method used

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  • Polyurethane latent curing agent, one-component polyurethane waterproof coating and preparation method thereof
  • Polyurethane latent curing agent, one-component polyurethane waterproof coating and preparation method thereof
  • Polyurethane latent curing agent, one-component polyurethane waterproof coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In terms of mass percentage, the raw materials of the high-performance one-component polyurethane waterproof coating in the present embodiment include the following components:

[0038]

[0039]

[0040] Among them, the catalyst is a mixture of triethylamine and dibutyltin dilaurate in a mass ratio of 2:8; the molecular weight of polyoxypropylene triol 330N is 4800, and the molecular weight of polyoxypropylene diol 2000D is 2000.

[0041]The preparation method of self-made latent curing agent A is as follows: put 116.20g of 1,6-hexamethylenediamine and 50g of water into a round-bottomed flask under nitrogen protection, and under rapid stirring, add 160.00g of n-butyraldehyde from the dropping funnel, and then Remove water and other volatile components (-0.1MPa) under negative pressure to obtain latent curing agent A.

[0042] The preparation method of above-mentioned one-component polyurethane waterproof coating, the steps are as follows:

[0043] (1) Put the pol...

Embodiment 2

[0049] In terms of mass percentage, the raw materials of the high-performance one-component polyurethane waterproof coating in the present embodiment include the following components:

[0050]

[0051]

[0052] Wherein, the catalyst is a mixture of triethylamine and stannous octoate with a mass ratio of 2:8.

[0053] The preparation method of self-made latent curing agent B is as follows: put 116.20g of 1,6-hexamethylenediamine and 50g of water into a round-bottomed flask under nitrogen protection, and under rapid stirring, add 130.00g of propionaldehyde from the dropping funnel, and then Remove water and other volatile components (-0.1MPa) under negative pressure to obtain latent curing agent B.

[0054] The preparation method of high-performance one-component polyurethane waterproof coating, the steps are as follows:

[0055] (1) Put polyoxypropylene triol 330N, PTMG2000, talcum powder, light calcium carbonate, CP52, and liquid petroleum resin into the dispersion kett...

Embodiment 3

[0061] In terms of mass percentage, the raw materials of the high-performance one-component polyurethane waterproof coating in the present embodiment include the following components:

[0062]

[0063]

[0064] Wherein, the catalyst is a mixture of bismuth isooctanoate and stannous octoate with a mass ratio of 4:6.

[0065] Wherein, the preparation method of self-made latent curing agent C is: drop into 160.00g n-butyraldehyde and 40g toluene in the round bottom flask under nitrogen protection, under rapid stirring, add 108.14g phenylenediamine, reflux reaction 3 hours, then in Remove water and other volatile components (-0.1MPa) under negative pressure to obtain the product.

[0066] The preparation method of high-performance one-component polyurethane waterproof coating, the steps are as follows:

[0067] (1) Put the polyoxypropylene triol 330N, PCD2000, kaolin, heavy calcium carbonate, diisononyl phthalate, and CP52 according to the formula ratio into the dispersion ...

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Abstract

The invention discloses a polyurethane latent curing agent having the structural formula of R1-CH--N-R 2-N--CH-R3, wherein R1 , R2 and R3 are alkyl group or aryl group or alkylaryl group. The molecular weight of the latent curing agent is not higher than 300. The invention also discloses a one-component polyurethane waterproof coating using the above latent curing agent and a preparation method thereof. The invention provides a polyurethane latent curing agent with good stability, and the one-component polyurethane waterproof coating prepared from the polyurethane latent curing agent is more resistant to storage and has a longer shelf life. Unit mass of the polyurethane latent curing agent can provide more -NH2 groups. The dosage is small and the application cost is low. The polyurethane waterproof coating disclosed in the invention has little damage to human body, is environmentally friendly, has excellent storage stability, has excellent coating performance, excellent tensile strength and tear strength, and can be prepared directly by existing production process and production equipment. The production costs are low.

Description

technical field [0001] The invention relates to the field of architectural waterproof coatings, in particular to a polyurethane latent curing agent, a one-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coating is a chemical reaction type waterproof coating. After curing, it is a rubber-like high-elastic coating film. The coating film is seamless as a whole. Because of its excellent comprehensive performance, it is called "liquid coil" by the industry. widely used within. After more than 20 years of development, my country's polyurethane waterproof coatings have a wide range of products and excellent performance, occupying an important position in the construction waterproof industry. [0003] The traditional two-component polyurethane waterproof coating has strict construction requirements, high technical level requirements for workers, and troublesome construction; while the one-component po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C07C251/08C07C249/02C09D175/02C09D175/08
CPCC07C251/08C08G18/3256C09D175/02C09D175/08
Inventor 吴海洋龚兴宇陈立义林焕章陈业煌胡全超
Owner 重庆科顺新材料科技有限公司
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