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Two-component waterproof polyurethane coating and preparation method thereof

A two-component polyurethane and waterproof coating technology, applied in the field of waterproof coatings, can solve the problems of catalytic effect and short storage period, and achieve the effect of shortening the construction period, promoting cross-linking and curing, and prolonging the storage time.

Inactive Publication Date: 2018-01-26
中油佳汇(广东)防水股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of catalytic effect and short shelf life of the existing two-component polyurethane waterproof coating, the present invention provides a two-component polyurethane waterproof coating and a preparation method thereof

Method used

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  • Two-component waterproof polyurethane coating and preparation method thereof
  • Two-component waterproof polyurethane coating and preparation method thereof

Examples

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preparation example Construction

[0068] Another embodiment of the present invention also provides the preparation method of the above-mentioned two-component polyurethane waterproof coating, comprising the steps of:

[0069] Preparation of component A:

[0070] Put the first polyether polyol into the reactor;

[0071] The temperature of the reaction kettle is raised to 100-105°C, and the vacuum dehydration is carried out for 1-3 hours;

[0072] After dehydration, the temperature of the first polyether polyol liquid is lowered to 78-82°C, and the isocyanate is added dropwise into the reactor in vacuum, and reacted for 2-4 hours, and the reaction temperature is controlled at 83-85°C;

[0073] After the reaction is completed, cool the liquid in the reaction kettle to 60-70°C, vacuum inhale the first solvent, stir and cool down to 40-45°C, put in catalyst microcapsules and stir to obtain component A;

[0074] Preparation of component B:

[0075] Adding the second polyether polyol and chlorinated paraffin into ...

Embodiment 1

[0082] This example is used to illustrate a two-component polyurethane waterproof coating disclosed in the present invention and its preparation method, including the following steps:

[0083] Preparation of component A:

[0084] Step A1: Feeding

[0085] Weigh 35 parts by weight of difunctional 2000 molecular weight polyether polyol, 9 parts by weight of trifunctional polyether polyol with 5000 molecular weight and 5 parts by weight of chlorinated paraffin, and vacuum suck the above materials into the reactor.

[0086] Step A2: Dehydration

[0087] The reaction kettle was started to stir at a stirring speed of 75 rpm, the temperature of the reaction kettle was raised to 105° C., and vacuum dehydration was performed under a pressure of -0.08 MPa for 2 hours.

[0088] Step A3: Add dropwise

[0089] After dehydration for 2 hours, open the vent valve to balance the internal and external pressure of the reactor, close the vacuum valve of the reactor, and then close the vent val...

Embodiment 2

[0113] This embodiment is used to illustrate a kind of two-component polyurethane waterproof coating disclosed by the present invention and its preparation method, including most of the operation steps as shown in Example 1, and its difference is:

[0114] Preparation of component A:

[0115] Step A5: Outgoing Packaging

[0116] When the temperature is lowered to 45°C, add 0.05 parts by weight of catalyst microcapsules and stir. The capsule core of the catalyst microcapsules is a palladium catalyst, and the capsule shell is an ethylene-vinyl acetate copolymer with a melting point of 55°C. Seal the package and store the barrel upside down.

[0117] When in use, heat component A to 70°C, and after stirring for 5 minutes, mix component A and component B at a weight ratio of 1:2 to obtain coating S2.

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Abstract

The invention provides a two-component waterproof polyurethane coating in order to solve the problems of poor catalysis effect and short shelf life of existing two-component waterproof polyurethane coatings. The two-component waterproof polyurethane coating comprises a component A and a component B; the component A comprises first polyether polyol, isocyanate, a catalyst microcapsule and a first solvent, the catalyst microcapsule comprises a capsule core and a capsule shell coated outside the capsule core, the capsule core comprises a palladium catalyst, and the melting point of the capsule shell is 50-70 DEG C; and the component B comprises second polyether polyol, chlorinated paraffin, a filler and a second solvent. The invention also discloses a preparation method of the two-component waterproof polyurethane coating. The two-component waterproof polyurethane coating can avoid the influences of the palladium catalyst on unreacted isocyanate radicals in a prepolymer during storage andprolong the storage time.

Description

technical field [0001] The invention belongs to the technical field of waterproof coatings, in particular to a two-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] The two-component polyurethane waterproof coating is composed of component A and component B. The prepolymer in component A contains unreacted isocyanate, and component B contains hydroxyl groups. When component A and component B are proportional When mixing, the isocyanate on the prepolymer reacts with the hydroxyl group to form a seamless elastic waterproof rubber film on the surface of the base layer, thereby preventing the surface of the base layer from seeping water. Most of the two-component polyurethane waterproof coatings widely used in my country's waterproof construction are tar-type, and the tar-type two-component polyurethane waterproof coatings contain heavy metals and aromatic hydrocarbon volatile solvents, which have a strong smell and are not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/65C08G18/48C08G18/22C08G18/12
Inventor 曾新龙吴光林
Owner 中油佳汇(广东)防水股份有限公司
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