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A kind of epoxy resin modified polyurethane waterproof coating and preparation method thereof

A polyurethane waterproof and epoxy resin technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult adhesion to non-polar substrates, easy sedimentation and delamination of waterproof coatings, shortened service life, etc., to achieve improved Structural stability and mechanical properties, increase chemical crosslink density, and prolong service life

Active Publication Date: 2020-04-14
ANHUI LENCAQI BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of epoxy resin to modify polyurethane can improve the physical strength and chemical stability of polyurethane waterproof coatings, but both epoxy resin and polyurethane contain a large number of strong polar groups, and the polarity of polyurethane modified by epoxy resin is stronger. For non-polar substrates such as paraffin, polyethylene, polypropylene, and polystyrene, the adhesion is lower, and it is easy to peel off, which limits the application of epoxy resin modified polyurethane waterproof coatings. In addition, the gap between modified polyurethane emulsion and fillers The poor compatibility of the epoxy resin makes the waterproof coating easy to settle and delaminate, shortening the service life. Therefore, how to weaken the polarity of the epoxy resin modified polyurethane coating and improve the compatibility between the emulsion and the filler is a problem that needs to be solved at present.
[0003] The patents whose application numbers are CN201510826962.7 and CN201710408108.8 respectively disclose water-based wood coatings containing modified polyurethane emulsions and their preparation methods. Both of them introduce hydrazide groups on the polyurethane main chain and ketone carbonyls on the acrylic main chain. , under the condition of water evaporation or heating, it will be cross-linked into a dense film, which will eventually improve the hardness and resistance of the paint film, but both the hydrazide group and the ketone carbonyl group are strong polar bonds, which further strengthen the polarity of the modified polyurethane coating. Difficulty adhering to non-polar substrates, limiting its range of applications

Method used

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  • A kind of epoxy resin modified polyurethane waterproof coating and preparation method thereof
  • A kind of epoxy resin modified polyurethane waterproof coating and preparation method thereof
  • A kind of epoxy resin modified polyurethane waterproof coating and preparation method thereof

Examples

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Embodiment 1

[0023] An epoxy resin modified polyurethane waterproof coating comprises the following components in parts by weight:

[0024]

[0025] The present invention also provides the preparation method of above-mentioned a kind of epoxy resin modified polyurethane waterproof coating, comprises the following steps:

[0026] S1: Heat hydroxyl-terminated polydimethylsiloxane, chloroplatinic acid, and silane coupling agent to 40°C, and then add dropwise epoxy resin, which is polymerized with bisphenol A diglycidyl ether monomer The resulting average molecular weight is 360, the average degree of polymerization is 0.4, and the glycidyl ether type resin with an epoxy value of 0.42 is continuously stirred to carry out condensation reaction until the amount of -OH in the reaction system is reduced by 30%, and the reaction is stopped to obtain polydimethylformaldehyde base siloxane modified epoxy resin;

[0027] S2: In a vacuum environment, heat the polyether diol to 100°C, dehydrate for ...

Embodiment 2

[0031] An epoxy resin modified polyurethane waterproof coating comprises the following components in parts by weight:

[0032]

[0033]

[0034] The preparation method of above-mentioned waterproof paint is with embodiment 1, difference is:

[0035] S1: The condensation reaction temperature is 50°C, the degree of reaction is 45% reduction in the number of -OH, and the epoxy resin used is polymerized from ethylene glycol-glycidyl ether monomer with an average molecular weight of 530 and an average degree of polymerization of 1. Glycidyl ether type resin with a value of 0.51;

[0036] S2: The dehydration temperature is 110°C, and the nucleophilic addition reaction conditions are 70°C and 100KPa nitrogen;

[0037] S3: heat preservation and stirring reaction time is 2h;

Embodiment 3

[0039] An epoxy resin modified polyurethane waterproof coating comprises the following components in parts by weight:

[0040]

[0041]

[0042] The preparation method of above-mentioned waterproof paint is with embodiment 1, difference is:

[0043] S1: The condensation reaction temperature is 60°C, the degree of reaction is 60% reduction in the number of -OH, and the epoxy resin used is polymerized from glycerol triglycidyl ether monomer with an average molecular weight of 700 and an average degree of polymerization of 1.6. Glycidyl ether type resin with a value of 0.6;

[0044] S2: The dehydration temperature is 120°C, and the nucleophilic addition reaction conditions are 75°C and 120KPa nitrogen;

[0045] S3: The reaction time of heat preservation and stirring is 3 hours.

[0046] With common epoxy resin modified polyurethane waterproof coating as comparative example, embodiment 1-3 and comparative example are respectively coated on polyethylene, polypropylene, poly...

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Abstract

The invention discloses epoxy-resin-modified polyurethane waterproof paint and a preparation method thereof. The epoxy-resin-modified polyurethane waterproof paint comprises the following components according to the parts by weight: 80-100 parts of polyether glycol, 20-40 parts of isophorone diisocyanate, 30-50 parts of an epoxy resin, 2-6 parts of hydroxy-terminated poly-dimethylsiloxane, 0.04-0.2 parts of chloroplatinic acid, 0.6-1 part of a silane coupling agent, 2-6 parts of dimethylolpropionic acid, 15-25 parts of acetone, 4-10 parts of trimethylamine, 0.02-0.5 parts of dibutyltin dilaurate, 5-10 parts of water, and 30-60 parts of inorganic filler. The preparation method comprises the following steps: S1: modifying the epoxy resin; S2: under the protection of nitrogen in 65-75 DEG C,performing a nucleophilic addition reaction of the polyether glycol; S3: in 70 DEG C, copolymerizing reaction products in the steps S1 and S2 and the dimethylolpropionic acid; and S4: neutralizing andhomogenizing. The epoxy-resin-modified polyurethane waterproof paint is capable of using the mutual crosslinking modification of polydimethylsiloxane, the epoxy resin and polyurethane, synthesizing the advantages of three parties, and improving the structure stability and the mechanical property of a coating film. The produced polyurethane waterproof paint can be tightly adhered to a non-polar base plane, and excellent in waterproof anti-penetrability performance.

Description

technical field [0001] The invention relates to the field of modified polyurethane waterproof coatings, in particular to an epoxy resin modified polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coatings are prepolymers containing isocyanate groups formed by addition polymerization of isocyanate and polyether, together with catalysts, anhydrous additives, anhydrous fillers, solvents, etc., and processed through mixing and other processes water-based waterproof coating. The use of epoxy resin to modify polyurethane can improve the physical strength and chemical stability of polyurethane waterproof coatings, but both epoxy resin and polyurethane contain a large number of strong polar groups, and the polarity of polyurethane modified by epoxy resin is stronger. For non-polar substrates such as paraffin, polyethylene, polypropylene, and polystyrene, the adhesion is lower, and it is easy to peel off, which lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D7/61C08G18/75C08G18/61C08G18/48C08G18/58C08G18/34
CPCC08G18/348C08G18/4045C08G18/4825C08G18/58C08G18/61C08G18/755C08K2201/011C09D7/61C09D175/08C08K3/36C08K3/34
Inventor 乔启信
Owner ANHUI LENCAQI BUILDING MATERIAL
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