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Polyurethane coating with waterproof function and preparation method thereof

A polyurethane coating and functional technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of insufficient compatibility between chlorinated paraffin and polyurethane coating components, poor coating performance, etc., to improve stability and Durability, excellent mechanical properties, and high productivity

Inactive Publication Date: 2021-06-01
徐松波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this direct addition method will cause insufficient compatibility between chlorinated paraffin and polyurethane coating components. Over time, uncrosslinked chlorinated paraffin will migrate to the surface of the coating, resulting in poor coating performance

Method used

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  • Polyurethane coating with waterproof function and preparation method thereof
  • Polyurethane coating with waterproof function and preparation method thereof
  • Polyurethane coating with waterproof function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of carboxyl-containing chlorinated paraffin 42: Dissolve 20 g of chlorinated paraffin 42 in 200 mL of acetone, stir to dissolve, add 20 g of p-hydroxybenzoic acid and 30 g of potassium carbonate, and react at 55° C. for 30 h under nitrogen protection. After the reaction, the pH was adjusted to 3.0 with hydrochloric acid, and then extracted with ethanol, and the product was vacuum-dried at 100° C. for 5 h to obtain carboxyl-containing chlorinated paraffin 42.

[0034] (2) Preparation of chlorinated paraffin 42 containing acid chloride: add 70mol carboxyl-containing chlorinated paraffin 42 to the reaction kettle, add 85mol phosphorus trichloride dropwise, stir and heat up to 50°C, react for 6h, cool to room temperature, and stand to separate Layer to obtain chlorinated paraffin 42 containing acid chloride.

[0035] (3) Preparation of hydroxyl-containing chlorinated paraffin 42: add 100mol2,2,3,3,4,4-hexafluoro-1,5-pentanediol and an appropriate amount of a...

Embodiment 2

[0039] (1) Preparation of carboxyl-containing chlorinated paraffin 42: Dissolve 20 g of chlorinated paraffin 42 in 210 mL of butanone, stir to dissolve, add 20 g of p-hydroxybenzoic acid and 32 g of potassium carbonate, and react at 80° C. for 10 h under nitrogen protection. After the reaction, the pH was adjusted to 3.0 with hydrochloric acid, and then extracted with ethanol, and the product was vacuum-dried at 100° C. for 5 h to obtain carboxyl-containing chlorinated paraffin 42.

[0040] (2) Preparation of chlorinated paraffin 42 containing acid chloride: add 70 mol of carboxyl-containing chlorinated paraffin 42 to the reaction kettle, add 85 mol of phosphorus trichloride dropwise, stir and heat up to 55° C., react for 6 hours, cool to room temperature, and stand to separate Layer to obtain chlorinated paraffin 42 containing acid chloride.

[0041] (3) Preparation of hydroxyl-containing chlorinated paraffin 42: add 100mol2,2,3,3,4,4-hexafluoro-1,5-pentanediol and an appropr...

Embodiment 3

[0045] (1) Preparation of carboxyl-containing chlorinated paraffin 52: Dissolve 20 g of chlorinated paraffin 52 in 250 mL of butanone, stir to dissolve, add 25 g of p-hydroxybenzoic acid and 28 g of potassium carbonate, and react at 65° C. for 30 h under nitrogen protection. After the reaction, the pH was adjusted to 3.0 with hydrochloric acid, and then extracted with ethanol, and the product was vacuum-dried at 100° C. for 8 hours to obtain carboxyl-containing chlorinated paraffin 52.

[0046] (2) Preparation of chlorinated paraffin 52 containing acid chloride: add 70mol carboxyl-containing chlorinated paraffin 52 to the reaction kettle, add dropwise 85mol phosphorus trichloride, stir and heat up to 70°C, react for 4h, cool to room temperature, let stand to separate layer to obtain the chlorinated paraffin 52 containing the acid chloride.

[0047] (3) Preparation of hydroxyl-containing chlorinated paraffin 52: add 100mol2,2,3,3,4,4-hexafluoro-1,5-pentanediol and an appropriat...

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Abstract

The invention discloses a polyurethane coating with a waterproof function and a preparation method thereof. The coating comprises a novel polyester polyol. The preparation method of the polyester polyol comprises the following steps of: reacting chlorinated paraffin with p-hydroxybenzoic acid to prepare carboxyl-containing chlorinated paraffin, acylating the carboxyl-containing chlorinated paraffin to obtain acyl chloride-containing chlorinated paraffin, carrying out an esterification reaction on the acyl chloride-containing chlorinated paraffin and 2, 2, 3, 3, 4, 4-hexafluoro-1, 5-pentanediol to obtain fluorine-containing chlorinated paraffin monohydric alcohol, reacting the fluorine-containing chlorinated paraffin monohydric alcohol with 4,4'-oxydiphthalic anhydride to obtain fluorine-containing chlorinated paraffin binary acid, and finally reacting the fluorine-containing chlorinated paraffin binary acid and polyol to obtain the polyester polyol with a waterproof function. The preparation method has the characteristics of simple operation, wide raw material source and mild reaction condition and meets the requirement of industrial production. The prepared polyester polyol is used for preparing the polyurethane waterproof coating, and due to introduction of hydrophobic fluorine atoms and cross-linking reaction of chlorinated paraffin, excellent waterproof, oil-proof and corrosion-resistant properties can be provided for the coating.

Description

technical field [0001] The invention relates to a polyurethane coating with waterproof function and a preparation method thereof, belonging to the field of waterproof coatings. Background technique [0002] Polyurethane waterproof coating has the characteristics of excellent overall waterproof effect, excellent mechanical properties, good low temperature flexibility, chemical corrosion resistance, convenient construction, easy repair, and long service life. It has been widely promoted as a new type of waterproof coating in the field of building waterproofing. use. [0003] Chlorinated paraffin is a chlorinated derivative of paraffin. It has the advantages of low volatility, flame retardancy, good barrier property, and low price. It can be used as additives such as plasticizers, flame retardants, waterproofing agents, and oil-resistant additives. , has been widely used in polyurethane waterproof coatings, and has achieved good waterproof effects. However, this direct additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C08G18/48C08G18/46C08G63/682
CPCC08G18/46C08G18/48C08G63/6826C09D175/04
Inventor 徐松波
Owner 徐松波
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