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Method for preparing special epoxy modified polyacrylate emulsion for waterborne industrial paints

A technology of polyacrylate emulsion and epoxy modification, applied in the direction of coating, etc., can solve the problems of reducing resin performance, high requirements for technical transformation, and limiting product application fields, etc., to achieve high hardness improvement, reasonable process, and broad market share Effect

Inactive Publication Date: 2014-04-30
山东聚东新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method still has some shortcomings. The preparation of epoxy resin and acrylic acid monomer pre-emulsion is made under the stirring of the dispersion speed of 1000-10000 (rev / min), combined with the pre-emulsification preparation speed commonly used in acrylic emulsion, generally It will not exceed 1000 rpm, and 1000-10000 rpm high-speed stirring should be used to prepare the pre-emulsion, which will require too high technical transformation of existing equipment, and at the same time, too small particle size may affect the amount of functional monomers. With obvious restrictions, this is not conducive to increasing the crosslinking density of the resin during the application process, which will greatly reduce the performance of the resin and further limit the application field of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example I

[0018] Example 1, get sodium lauryl sulfonate 3.48g, disodium hydrogen phosphate 0.5g, secondary alkanol polyoxyethylene ether 1.64g is dissolved in 205g water and makes the emulsifier of pre-emulsion and water mixed solution. Another 20g of epoxy resin (AL-3040) was dissolved in 400g of reactive monomers (among them: 120g of butyl acrylate, 296.1g of methyl methacrylate, 15.3g of acrylic acid, and 8.6g of methylol acrylamide). Epoxy-monomer mixture. Place the emulsifier-water mixture under 600 (rev / min) stirring, then slowly add the epoxy resin-monomer mixture into the pre-emulsion tank for high-speed dispersion, stir for 30 minutes, and set aside. In reactor, add 308g water, get sodium lauryl sulfonate 2.13g, secondary alkanol polyoxyethylene ether 1.28g, when temperature in reactor rises to 8 0 — At 90°C, feed nitrogen, weigh 4% of the pre-emulsion and add it to the reactor, and add 60% of the initiator. After 10 minutes of reaction, mix the remaining epoxy-monomer pre-emu...

example 2

[0019] Example 2: Take 200g of the epoxy-modified polyacrylic acid emulsion obtained in "Example I", add 2.73g of epoxy resin curing agent (ANCAMN 2264) and stir evenly, spray it on a glass plate, and put it in an oven at 120-130°C Bake for 30 minutes, test after standing at room temperature for 1 hour, its resistance to 50% ethanol can reach 36 hours without abnormal phenomena, its hardness can reach more than 2H, and its resistance to salt spray can exceed 550 hours.

example 3

[0020] Example 3: Get fatty alcohol ether sulfosuccinate sodium salt 3.45g, disodium hydrogen phosphate 0.5g, secondary alkanol polyoxyethylene ether 1.48g and dissolve in 205 water to make the emulsifier and water mixture of pre-emulsion . In addition, 20g of epoxy resin (AL-3040) was dissolved in 400g of reaction monomers (wherein: butyl acrylate 93g, methyl methacrylate 270.8g, acrylic acid 15.3g, methylol acrylamide 8.6g, methyl Glycidyl acrylate 12.3g) made epoxy-monomer mixed solution. Add 308g of water to the reaction kettle, get 6.45g of fatty alcohol ether sulfosuccinate sodium salt, 1.73g of secondary alkanol polyoxyethylene ether, and the rest are operated according to "Example 1". After the reaction, the solid content is about 45% epoxy-modified polyacrylic acid emulsion, the epoxy equivalent is 4.5-5.5, and the storage time is more than 6 months. The application test is operated according to "Example 2". The test results show that the resistance to 50% ethanol c...

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Abstract

The invention discloses a method for preparing a special epoxy modified polyacrylate emulsion for waterborne industrial paints. The method comprises the following steps: preparing materials, performing emulsification treatment and carrying out a polymerization reaction. The preparation of the emulsion comprises the following steps: performing emulsification treatment to prepare an epoxy-monomer pre-emulsion under the stirring condition, and adding an initiator under a certain process conditions so as to react to prepare the epoxy modified polyacrylate emulsion. The emulsion has the average particle size of not more than 100 mu and is high in storage stability, solvent resistance, salt fog resistance and hardness, and the storage time of the emulsion exceeds six months even can exceed one year. When being applied to waterborne glass baking finish, the emulsion can resist 50% ethanol, a condition that an abnormal phenomenon is avoided within 48 hours can be achieved, the hardness can be over 3H, and the salt fog resistance exceeds 650 hours. The method is stable in polymerization, the requirement on the stirring speed is low in the process of performing epoxy-monomer mixing, emulsification and polymerization, and the method is extremely favorable for industrial production.

Description

technical field [0001] The invention relates to a preparation technology of an epoxy-modified polyacrylate emulsion that can be used as a water-based glass baking varnish in the field of high molecular polymers. Background technique [0002] Epoxy-modified polyacrylate emulsion can be used as high-performance water-based glass baking varnish after adding epoxy resin curing agent. In order to improve its stability, solvent resistance, hardness, and salt spray resistance, not much research work has been done at home and abroad, and there are fewer articles and patents for water-based industrial paints. [0003] Propose a kind of method for preparing epoxy-polyacrylate emulsion in Chinese patent CN91110581.6, this method can be summarized as: 1. epoxy resin dilution, emulsification method; 2. the polymerization mode of epoxy modified acrylic acid emulsion, when using Adding a curing agent can be used for bonding multi-layer plastic films. The essence of this method is to dilu...

Claims

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Application Information

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IPC IPC(8): C08F283/10C08F220/18C08F220/14C08F220/06C08F220/58C08F220/32C08F218/00C08F2/26C08F2/30C08F2/38C08F4/40C09D151/08
Inventor 崔志勇李培环魏志华
Owner 山东聚东新材料有限责任公司
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