Synthetic method and application of urea monomer modified hydroxyl acrylic emulsion

A synthesis method and technology of hydroxybenzene, applied in the direction of coating, etc., can solve the problems of poor orientation, poor storage stability, and aggregation of glitter pigments, and achieve good ethanol wiping resistance, simple and easy method, and good repeatability.

Inactive Publication Date: 2012-06-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solubility parameters and surface tension of water are high, the wettability to the bottom surface and pigments is poor, and the adhesion of the coating to the plastic surface is poor; secondly, the volatilization speed of water is slow, and it is easily affected by the environment such as temperature and humidity. Problems with sagging, poor orientation of glitter pigments, etc.
Therefore, the construction and application of water-based coatings have higher requirements on the cleanliness of the plastic surface and the humidity of the construction environment; third, the problem between the hydrophilicity of the coating and the water resistance of the coating film must be solved; fourth, water-based coatings are non-uniform Phase system, its storage stability is poor, prone to aggregation (caking) phenomenon

Method used

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  • Synthetic method and application of urea monomer modified hydroxyl acrylic emulsion
  • Synthetic method and application of urea monomer modified hydroxyl acrylic emulsion
  • Synthetic method and application of urea monomer modified hydroxyl acrylic emulsion

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026]

[0027] Polymerization process:

[0028] 1. After cleaning the reaction kettle, add the bottom material and heat it to 78°C.

[0029] 2. At 78°C, add 5% of the core layer monomer pre-emulsion into the reactor, and wait for 5 minutes for the temperature to recover.

[0030] 3. Add 25% of the initiator solution, keep warm for 15 minutes after the blue light appears, then add the remaining 75% of the core layer monomer pre-emulsion, and keep warm for 30 minutes.

[0031] 4. Add the remaining shell monomer pre-emulsion and initiator solution dropwise at the same time for 2.5 hours.

[0032] 5. After feeding, raise the temperature to 85°C and keep it warm for 30 minutes.

[0033] 6. Cool down and neutralize to pH=8.0, filter and discharge.

[0034] Low-temperature baking aluminum powder paint formula for ABS plastic

[0035]

[0036] The performance index of above-mentioned coating:

[0037] Pencil hardness (70°C, 30min): ≥HB;

[0038] Pencil hardness (7 days)...

example 2

[0043]

[0044] The process steps of the production method are the same as in Example 1, wherein the temperature in step 2 is 80° C., and the dropping time in step 4 is 3 hours.

[0045] Formula for self-drying white paint on urea-formaldehyde plastics

[0046]

[0047] The performance index of above-mentioned paint:

[0048] Surface dry time: 45min;

[0049] Working time: 4.5h

[0050] Pencil hardness (7 days): ≥H

[0051] Adhesion (cross-cut method): 13% fall off

[0052] Water resistance (at room temperature): no whitening within 48 hours

[0053] Gloss (60 。 ): 70

[0054] Alcohol resistance (500g weight): ≥50 times.

example 3

[0056]

[0057] The process steps of the production method are the same as those in Example 1, wherein the temperature in step 2 is 80° C., and the dropping time in step 4 is 3.5 hours.

[0058] Low temperature self-drying paint formula for ABS plastic

[0059]

[0060] The performance index of above-mentioned paint:

[0061] Surface dry time: 35min;

[0062] Working time: 5h

[0063] Pencil hardness (7 days): ≥H

[0064] Adhesion (cross-cut method): 10% fall off,

[0065] Water resistance (room temperature): 48h does not turn white.

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Abstract

The invention discloses a synthetic method and application of a urea monomer modified hydroxyl acrylic emulsion. The urea monomer modified hydroxyl acrylic emulsion is synthesized by a pre-emulsification semi-continuous seed emulsion polymerization method and applied to double-component aqueous plastic paint. According to performance test, functional groups of urea monomer interact with surface of polar plastic to enhance dry and wet adhesive force; meanwhile, hydroxy reacts with isocyanate to form a stereoscopic net structure to increase compactness of a film, water resistance and ethanol wiping resistance performances. The urea monomer modified hydroxyl acrylic emulsion prepared by the invention can carry out solidification reaction with aqueous isocyanate to gain good adhesive force and ethanol wiping resistance, so as to satisfy application requirements of low temperature solidified polar plastic paint.

Description

technical field [0001] The invention relates to a synthesis method and application of urea monomer-modified hydroxystyrene-acrylic emulsion. Background technique [0002] Plastics have been widely used in all walks of life in the national economy. However, the environmental corrosion resistance of plastics such as ultraviolet light is not ideal, and it often leads to various surface defects after processing and molding. Therefore, it is necessary to apply coatings to plastics, which can not only beautify the decoration but also effectively protect it. At present, the coatings used for plastic coating are mainly solvent-based. With the requirements of environmental protection, water-based coatings are gradually required to replace solvent-based coatings for plastics. The advantages of water-based coatings are non-flammable, non-explosive, non-toxic and harmless, and low VOCs emissions, which meet the requirements of green environmental protection. [0003] The surface tens...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F220/60C08F230/08C08F212/08C08F220/28C08F2/30C09D133/12
Inventor 余林张虎孙明余倩成晓玲
Owner GUANGDONG UNIV OF TECH
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