Two-component polyurethane putty for repairing vehicle body coating, and application method thereof

A two-component polyurethane and coating technology, applied in the direction of coating, device for coating liquid on the surface, filling slurry, etc., can solve the problems of low delivery efficiency, high labor cost, harmful to health, etc. The effect of emission, reduction of construction links, and improvement of delivery efficiency

Inactive Publication Date: 2021-10-26
榕珍新材料科技发展(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned repair process has the following defects: (1) The repair process steps are cumbersome and time-consuming, and the delivery efficiency is low; (2) It is labor-intensive and time-consuming, requiring high operating levels of construction personnel and high labor costs; (3) More materials are required, Moreover, the solvent-based coatings used in primers and intermediate coatings have a lot of VOC emissions, which pollute the environment and are harmful to health.

Method used

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  • Two-component polyurethane putty for repairing vehicle body coating, and application method thereof
  • Two-component polyurethane putty for repairing vehicle body coating, and application method thereof
  • Two-component polyurethane putty for repairing vehicle body coating, and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 120g molecular weight is 1400-1600 soybean oil-based polyol (SD-430, Shanghai Gaowei Industrial Co., Ltd.), 50g molecular weight is 800-900 soybean oil-based polyol (SD-250, Shanghai Gaowei Industrial Co., Ltd.), 300g calcium carbonate, 400g talcum powder, 10g thixotropic agent (fumed silica), 5g wetting and dispersing agent (BYK-9076), 10g defoamer (TEGO900), 0.5g diisobutyltin laurate, 30g 4A molecular sieve Activation powder, 10g of silane coupling agent, and 32g of hollow glass spheres were stirred and mixed evenly at a high speed under the condition of 80-100°C to obtain component A for later use;

[0040] Stir and mix component A and component B (HDI trimer) at room temperature at a weight ratio of 8:1 to obtain a mixture that is a two-component polyurethane putty.

Embodiment 2

[0042] 170g castor oil-based polyol (Uric H-30), 300g calcium carbonate, 400g talcum powder, 12g thixotropic agent (fumed silica), 6g wetting and dispersing agent (BYK-9076), 8g defoamer (Digo TEGO900), 0.5g of diisobutyltin laurate, 30g of 4A molecular sieve activation powder, 10g of silane coupling agent, and 28g of hollow glass spheres were stirred and mixed evenly at a high speed under the condition of 80-100°C to obtain component A for later use;

[0043] Stir and mix component A and component B (HDI trimer) at room temperature at a weight ratio of 8:1 to obtain a mixture that is a two-component polyurethane putty.

Embodiment 3

[0045] 100g soybean oil-based polyol (SD-430, Shanghai Gaowei Industrial Co., Ltd.) with a molecular weight of 1400-1600, 500g calcium carbonate, 0.50g thixotropic agent (BYK-410), 8g wetting and dispersing agent (BYK-9076) , 8g defoamer (TEGO900), 1g stannous octoate, 38g4A molecular sieve activation powder, 8g silane coupling agent, 40g hollow glass spheres were mixed evenly at high speed under the condition of 80-100°C to obtain component A for later use;

[0046] Stir and mix component A and component B (HDI biuret) at room temperature at a weight ratio of 10:1 to obtain a mixture that is a two-component polyurethane putty.

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Abstract

The invention discloses a two-component polyurethane putty for repairing a vehicle body coating. The two-component polyurethane putty comprises a component A and a component B; the component A is prepared from, by weight, 10 to 25 parts of bio-based polyol, 50 to 100 parts of an inorganic filler, 0.5 to 2 parts of a thixotropic agent, 0.5 to 1 part of a wetting dispersant, 0.5 to 1 part of a defoaming agent, 0.05 to 0.1 part of a catalyst and 3 to 5 parts of a molecular sieve activating powder; the component B is a polyisocyanate curing agent; and the bio-based polyhydric alcohol is soybean oil-based polyhydric alcohol or castor oil-based polyhydric alcohol. The putty does not contain a solvent, is environment-friendly and pollution-free, has strong adhesion to a substrate, can form coating films with different thicknesses through blade coating, plays a role of a floating coat, can avoid primer and the floating coat during use, can be constructed at one time, reduces the labor cost, and improves the work efficiency.

Description

technical field [0001] The invention relates to the technical field of car body surface repair materials, in particular to a two-component polyurethane putty for car body coating repair and an application method thereof. Background technique [0002] After the coating on the surface of vehicles and other mechanical equipment is damaged, it needs to be repaired in time. The repair process of the existing vehicle body equipment coating is as follows: [0003] 1) First remove the old coating at the damaged part, and if the damage is serious, it needs to be polished to the metal substrate of the car body; [0004] 2) Then spray an epoxy primer with better anti-corrosion effect to improve the adhesion of the subsequent coating and strengthen the anti-corrosion ability of the metal substrate; [0005] 3) After the primer is dry, use putty to fill and repair the depression formed after removing the old coating, and polish it to make it smooth after the putty is dry; [0006] 4) S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/34B05D7/24
CPCC09D5/34B05D7/24B05D2503/00
Inventor 孟祥侠
Owner 榕珍新材料科技发展(上海)有限公司
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