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Water-dispersible two-component polyurea coating composition with excellent weather resistance and elasticity as well as preparation method and application thereof

A weather resistance, composition technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., to achieve the effect of improving strength, improving working environment, and eliminating fire hazards

Active Publication Date: 2020-04-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current polyurea systems are mainly solvent-based or solvent-free two-component spraying systems. With the strengthening of people's environmental awareness and environmental protection regulations, the research and development of environmentally friendly water-based polyurethanes are increasingly valued. Dispersed polyurea system has not been reported yet

Method used

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  • Water-dispersible two-component polyurea coating composition with excellent weather resistance and elasticity as well as preparation method and application thereof
  • Water-dispersible two-component polyurea coating composition with excellent weather resistance and elasticity as well as preparation method and application thereof
  • Water-dispersible two-component polyurea coating composition with excellent weather resistance and elasticity as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0024] Embodiment 1~3 prepares curing agent component B

[0025] 1. The formula of component B is shown in Table 1

[0026] Table 1

[0027]

[0028]

[0029] 2. Preparation process

[0030] Put polycaprolactone diol and amino-terminated methoxy polyether at 105°C with nitrogen for vacuum dehydration, then add aliphatic polyisocyanate or aliphatic or alicyclic diisocyanate at one time, and react at 80°C for 6 hours Make component B.

Embodiment 4～5

[0031] Embodiment 4~5 prepares component A

[0032] 1. Component A formula Table 2

[0033]

[0034] Note: Polyaspartic acid resin F420-1 and polyaspartic acid resin F420-2 in Table 2 both refer to polyaspartic acid resin F420, which are added in two times, so they are replaced by different numbers.

[0035] 2. Synthesis process: put polyaspartic acid resin F420-1 and aminomethoxy terminated polyether CAM2070 into a clean reactor with heating and cooling device, thermometer, stirrer and inert gas introduction pipe according to the ratio in Table 2. Raise the temperature to 105°C for 2 hours, vacuumize and dehydrate with nitrogen, then lower the temperature to below 40°C, then add HDI diisocyanate or IPDI diisocyanate at one time, react at no higher than 40°C for 1 hour, then slowly raise the temperature to 80°C and react for 6 hours Then lower the temperature to below 40°C and then put polyaspartic acid resin F420-2 into it, react at no higher than 40°C for 1 hour, then sl...

Embodiment 6～7

[0037] 1. Coating formula see Table 3

[0038] table 3

[0039]

[0040] 2. Process

[0041] According to the ratio in Table 3, after mixing the water dispersion of component A with rutile titanium dioxide R902 evenly, grind it in a sand mill to a fineness of ≤20 μm, then add other additives and stir evenly, then add component B in proportion, and use Deionized water is adjusted to the application viscosity to obtain the coating composition of the present invention.

[0042] 3. Coating performance inspection

[0043] (1) The sample is prepared according to the national paint testing standards;

[0044] (2) Preparation of elastic film

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Abstract

The invention discloses a water-dispersible two-component polyurea coating composition with excellent weather resistance and elasticity as well as a preparation method and application of the water-dispersible two-component polyurea coating composition. The water-dispersible two-component polyurea coating composition is prepared from a component A and a component B. The component A is prepared from80 to 140 parts of polyaspartic acid resin, 20 to 100 parts of amino-terminated methoxy polyether, 10 to 50 parts of aliphatic diisocyanate, 0.1 to 0.4 part of an antiseptic bactericide and 165 to 375 parts of deionized water. The component B is prepared from the following components in parts by weight: 70 to 100 parts of a polycaprolactone polyol, 0 to 15 parts of an aliphatic polyisocyanate, 15to 70 parts of an aliphatic diisocyanate and 10 to 50 parts of an amino-terminated methoxy polyether. The coating composition is excellent in weather resistance and elasticity and can be dispersed inwater, the strength of the coating composition after film forming can be changed within a large range, and meanwhile the requirements for compatibility, mechanical performance and medium resistance of film forming substances are met.

Description

technical field [0001] The invention belongs to the technical field of paint preparation, and in particular relates to a water-dispersible two-component polyurea paint composition with excellent weather resistance and elasticity, a preparation method and application thereof. Background technique [0002] With the continuous emergence of new raw materials for coatings, industries such as construction, automobiles, wind power generation, military equipment, and heavy-duty anti-corrosion industries have higher and higher requirements for the elasticity, strength, weather resistance, and chemical resistance of coatings. The polyurea system responds quickly. The reaction has the characteristics of energy saving and high efficiency, and is widely used in the fields of building waterproofing, heat preservation and anticorrosion. [0003] However, the current polyurea systems are mainly solvent-based or solvent-free two-component spraying systems. With the strengthening of people's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C08G18/79C08G18/73C08G18/75C08G18/50C08G18/42C08G18/64C08G18/60
CPCC08G18/4018C08G18/4054C08G18/4081C08G18/4277C08G18/5024C08G18/603C08G18/6415C08G18/725C08G18/73C08G18/755C08G18/792C09D175/02
Inventor 袁立新沈彬
Owner SOUTHEAST UNIV
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