Preparation method of novel single-component water-cured polyurethane waterproof coating

A polyurethane waterproof, one-component technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of environmental protection, low use value, long hair cycle, etc., and achieve excellent aging resistance and mechanical properties , The effect of low thermal conductivity

Active Publication Date: 2020-04-24
ZHOUKOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN103540254B provides a preparation method of one-component water-curable polyurethane waterproof coating, its raw material components include 120 parts of polyether glycol, 70 parts of polyether trihydric alcohol, 350 parts of plasticizer diisobutyl phthalate (DIBP) and 26 parts of toluene diisocyanate TDI, the use of raw material TDI can increase the strength of the waterproof coating to 2.6MPa, and the elongation at break to 721%, but the waterproof coating has a certain degree of irritation, and the cycle will be long, and it will be discarded TDI treatment costs are high, not environmentally friendly, and the use value is not high
[0005] CN104745064B provides a kind of environment-friendly one-component polyurethane waterproof coating, and its raw material comprises modified liquefied MDI, polyether polyol, catalyst triethylenediamine etc., and it modifies liquefied MDI and carbodiimide- Uretonimine modified liquefied MDI can increase the elongation at break of polyurethane waterproof coatings to 700%, but the tensile strength is only 2.47MPa

Method used

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  • Preparation method of novel single-component water-cured polyurethane waterproof coating

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Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1 A kind of preparation method of novel single-component water-cured polyurethane waterproof coating

[0045] The preparation method of described novel one-component water-cured polyurethane waterproof coating comprises the following steps:

[0046] 1. Dry

[0047] The polyether diol and the polyether triol are respectively vacuum dehydrated to a moisture content of 0.11%;

[0048] 2. mix

[0049] Mix polyether diol and polyether triol according to the ratio of mass ratio 15:2, stir, and add benzoyl chloride in the reactor;

[0050] The add-on of described benzoyl chloride is 0.1% of polyether glycol and polyether trihydric alcohol gross weight;

[0051] 3. Prepolymerization

[0052] Nitrogen was passed under normal pressure for 20 minutes, the air in the reactor was removed, and MDI was added under the protection of nitrogen atmosphere to raise the temperature to 80°C for prepolymerization for 4 hours to obtain a prepolymer;

[0053] The add-on of descr...

Embodiment 2

[0067] Embodiment 2 A kind of preparation method of novel single-component water-cured polyurethane waterproof coating

[0068] The preparation method of described novel one-component water-cured polyurethane waterproof coating comprises the following steps:

[0069] 1. Dry

[0070] The polyether diol and polyether triol are vacuum dehydrated respectively to a moisture content of 0.2%;

[0071] 2. mix

[0072] Mix polyether diol and polyether triol according to the ratio of mass ratio 7:1, stir, add benzoyl chloride in the reactor;

[0073] The add-on of described benzoyl chloride is 0.09% of polyether glycol and polyether trihydric alcohol gross weight;

[0074] 3. Prepolymerization

[0075] Nitrogen was passed under normal pressure for 20 minutes, the air in the reactor was removed, and MDI was added under the protection of nitrogen atmosphere to raise the temperature to 78°C for prepolymerization for 3 hours to obtain a prepolymer;

[0076] The add-on of described MDI,...

Embodiment 3

[0090] Embodiment 3 A kind of preparation method of novel single-component water-cured polyurethane waterproof coating

[0091] The preparation method of described novel one-component water-cured polyurethane waterproof coating comprises the following steps:

[0092] 1. Dry

[0093] The polyether diol and the polyether triol are respectively vacuum dehydrated to a moisture content of 0.08%;

[0094] 2. mix

[0095] Mix polyether diol and polyether triol according to the ratio of mass ratio 8:1, stir, and add benzoyl chloride to the reactor;

[0096] The add-on of described benzoyl chloride is 0.1% of polyether glycol and polyether trihydric alcohol gross weight;

[0097] 3. Prepolymerization

[0098] Nitrogen was passed under normal pressure for 20 minutes, the air in the reactor was removed, and MDI was added under the protection of nitrogen atmosphere to raise the temperature to 82°C for prepolymerization for 4 hours to obtain a prepolymer;

[0099] The add-on of descri...

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Abstract

The invention provides a preparation method of a novel single-component water-cured polyurethane waterproof coating. The specific preparation process comprises the steps of drying, mixing, pre-polymerizing, chain extending and film forming. During the preparation process, according to the invention, polyether glycol and polyether triol are mixed according to a specific ratio; a certain amount of benzamide is added; the addition amount, the reaction temperature and the reaction time of diphenylmethane diisocyanate in the prepolymer synthesis process are reasonably controlled; by combining the use of a chain extender and materials, the single-component water-cured polyurethane waterproof coating has the advantages of higher tensile strength, higher elongation at break, excellent heat resistance, excellent water resistance, excellent aging resistance, convenience in construction, lower cost and no environmental pollution, and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the field of polyurethane waterproof coatings, and in particular relates to a preparation method of a novel single-component water-cured polyurethane waterproof coating. Background technique [0002] Since Otto.Bayer in Germany used 1,4-butanediol and hexamethylene diisocyanate to synthesize polyurethane for the first time in 1937, polyurethane has received extensive research and attention in the chemical industry because of its excellent chemical properties and mechanical and physical properties. Polyurethane waterproof coating has become one of the fastest-growing varieties in the global coating industry in the past ten years due to its excellent product performance and processing diversity. [0003] In terms of the application of one-component polyurethane waterproof coatings, toluene diisocyanate (TDI) is the most commonly used polyisocyanate in domestic production of polyurethane coatings. TDI has strong irritation, high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/61C09D7/63C09D7/65C08G18/76C08G18/66C08G18/48C08G18/32
CPCC09D175/08C09D7/61C09D7/63C09D7/65C08G18/7671C08G18/6674C08G18/4812C08K2003/265C08K2003/2206C08L91/06C08K13/02C08K3/34C08K3/346C08K3/26C08K3/22C08K5/5333C08K5/12C08K5/42C08L71/02
Inventor 孙现科许留洋孙玲玲王亮亮李韶峰
Owner ZHOUKOU NORMAL UNIV
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