Epoxy tung oil-based waterborne polyurethane modified raw lacquer and preparation method thereof

An oil-based water-based, epoxy tung oil technology, applied in polyurea/polyurethane coatings, natural resin coatings, coatings, etc., can solve the problems of low comprehensive performance of raw lacquer, long surface drying time of paint film, etc., and achieve high impact resistance , light color, good flexibility

Active Publication Date: 2020-01-07
陕西中合共创科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and deficiencies of the existing technology, an epoxy tung oil-based waterborne polyurethane modified raw lacquer and its preparation method are proposed. The raw lacquer is modified by using biomass tung oil resou

Method used

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  • Epoxy tung oil-based waterborne polyurethane modified raw lacquer and preparation method thereof
  • Epoxy tung oil-based waterborne polyurethane modified raw lacquer and preparation method thereof
  • Epoxy tung oil-based waterborne polyurethane modified raw lacquer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, the preparation of epoxy tung oil-based water-based polyurethane emulsion:

[0025] Take 44g of tung oil, 50g of petroleum ether, and 3.6g of formic acid and add them into a four-necked reaction flask equipped with an electric stirrer, a thermometer, a dropping funnel, and a condenser, and place it in a constant temperature water bath at 25°C. After stirring at room temperature to disperse evenly, a mixture of 10.2 mL of hydrogen peroxide and 0.44 g of phosphoric acid catalyst was added dropwise at a rate of 20 drops per minute. Since there is exothermic phenomenon in the reaction process, the speed of dropping must be strictly controlled to ensure that the temperature of the system is basically kept stable. After the dropwise addition is completed and the temperature is stable, adjust the temperature of the system to 40°C, stop the reaction after 2 hours, neutralize the reaction mixture to neutrality with saturated sodium bicarbonate, remove the water layer wit...

Embodiment 2

[0033] The difference between this example and Example 1 is that 37.9 g of diphenylmethane diisocyanate is added.

[0034] The performance test results of the modified raw lacquer prepared in this example are basically the same as those in Example 1.

Embodiment 3

[0036] The difference between this embodiment and embodiment 1 is that diphenylmethane diisocyanate is used instead of isophorone diisocyanate.

[0037] The performance test results of the modified raw lacquer prepared in this example are basically the same as those in Example 1.

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Abstract

The invention discloses epoxy tung oil-based waterborne polyurethane modified raw lacquer and a preparation method thereof. The preparation method comprises the steps: mixing tung oil, petroleum etherand formic acid according to the mass ratio of 12:13:(0.5-2), then adding a mixture of hydrogen peroxide and phosphoric acid, and carrying out a reaction for 2-3 h at the temperature of 20-50 DEG C,to obtain epoxy tung oil; mixing the epoxy tung oil with diethanol amine, carrying out a reaction for 2-10 h at the temperature of 70-90 DEG C, cooling to room temperature, adding a chain extender, heating to 50-80 DEG C, adding diisocyanate, and carrying out a reaction for 2-10 h to obtain an epoxy tung oil-based waterborne polyurethane solution; and mixing the raw lacquer with the epoxy tung oil-based waterborne polyurethane according to a mass ratio of 1:(0.5-2) to obtain the epoxy tung oil-based waterborne polyurethane modified raw lacquer. Compared with a raw lacquer film, the dried modified raw lacquer film has the advantages of color lightening, high transparency, solvent resistance, water resistance, acid and alkali resistance, aging resistance, high hardness, good flexibility, strong adhesive force and high impact resistance. The modified raw lacquer is low in allergy, good in dryness and convenient to construct.

Description

technical field [0001] The invention belongs to the technical field of raw lacquer modification, and in particular relates to an epoxy tung oil-based water-based polyurethane modified raw lacquer and a preparation method thereof. Background technique [0002] Raw lacquer is the secretion of lacquer tree, mainly composed of urushiol, laccase, gum (polysaccharide), glycoprotein, water, metal ions and other substances. The only natural green paint that is enzymatically cured into a film. The raw lacquer film is hard and bright, and has good properties such as corrosion resistance, wear resistance, acid resistance, solvent resistance, heat resistance, water insulation and good insulation. However, due to the large amount of urushiol contained in raw lacquer, there are some disadvantages in raw lacquer, such as serious allergic toxicity to the human body. In addition, raw lacquer has a long drying time, high viscosity, difficult construction, poor alkali resistance and weather r...

Claims

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Application Information

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IPC IPC(8): C09D193/00C09D175/14C08G18/36C08G18/32
CPCC08G18/3206C08G18/36C08L2201/10C09D175/14C09D193/00C08L75/14C08L93/00
Inventor 吕虎强李东旭
Owner 陕西中合共创科技服务有限公司
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