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A kind of preparation method of water-based acrylate emulsion for coating

A water-based acrylate and solid acrylic technology, applied in the field of polymer material preparation, can solve problems such as increasing system VOC and production costs, affecting construction and user health, and discussing high temperature anti-sticking, so as to overcome inconvenience in construction or environmental pollution. , easy to control, the effect of improving wear resistance

Active Publication Date: 2016-06-22
张家港保税区康得菲尔实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that different t g The emulsion will have poor compatibility, resulting in poor gloss after film formation, and it is necessary to add additives to improve the compatibility of the two emulsions, which will increase the VOC and production costs of the system
The Rohm and Haas Company of the United States studied different T g Emulsion blending yielded an average T g For emulsions higher than MFFT, the product has better anti-adhesion at room temperature, but there is no discussion on anti-adhesion at high temperature, and an aggregating agent is used to improve compatibility during blending, which undoubtedly increases the VOC in the system
[0005] The emulsion obtained by the above two technologies has a common disadvantage of traditional acrylic resin after film formation, that is, the high temperature anti-adhesion is poor, which needs to be improved by adding additives in the application process, which will also increase the VOC and production cost of the system
[0006] There is still another method at present, using a macromolecular water-soluble solid resin as a protective colloid to synthesize an acrylate emulsion, but it is mostly used as a dispersed binder in water-based inks, and it is rarely used in coatings; and the prior art mainly uses ammonia water Or other organic amines as neutralizers, the former has a strong smell, while the latter has no smell, but it will volatilize slowly after long-term use, causing pollution to the environment and affecting the construction and the health of users
Fu Lefeng et al. used self-made alkali-soluble solid resin as the dispersion protective colloid in the invention patent application with application number 201210477966.5 (application date November 22, 2012) and titled "An Anti-sticking Pure Acrylic Emulsion for Water-Based Ink". , to obtain an emulsion with better anti-tackiness, but the alkali-soluble neutralizer uses ammonia water, which will cause adverse effects on the environment during construction and use

Method used

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  • A kind of preparation method of water-based acrylate emulsion for coating
  • A kind of preparation method of water-based acrylate emulsion for coating
  • A kind of preparation method of water-based acrylate emulsion for coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Add 61.65g of Johnson resin J-671, 8g of triallylamine, and 356.3g of water into the reaction kettle, stir until completely dissolved, and raise the temperature to 80°C to obtain system 1.

[0042] 2. Mix 100g of styrene, 20g of methyl methacrylate, 60g of n-butyl acrylate, 25g of n-butyl methacrylate and 2.05g of methacrylic acid, and add them dropwise to system 1 in 3 hours, while dissolving 0.6 Add 20 g of water in 1 g of ammonium persulfate dropwise to System 1 in 3 hours to obtain System 2.

[0043] 3. Heat system 2 to 90°C, keep it warm for 1.5h, cool down to room temperature, adjust the pH value to about 8, and filter out.

[0044] From figure 1 It can be seen in the T of the solid resin g at around 128°C, while the T of the acrylate copolymer g Around 34°C; figure 2 It can be seen that the average particle size is 45nm, and the resulting emulsion is translucent.

[0045]

[0046] Examples mentioned in the average T g Calculated according to the FOX ...

Embodiment 2

[0048] 1. Add 40.88g of Hanwha Resin S-120, 4g of diallylamine, and 356.3g of water into the reaction kettle, stir until completely dissolved, and raise the temperature to 80°C to obtain System 1.

[0049] 2. Mix 102.5g of styrene, 20g of methyl methacrylate, 55g of n-butyl acrylate, 26g of n-butyl methacrylate and 2.05g of methacrylic acid, and add them dropwise to system 1 within 3 hours. 0.6g of ammonium persulfate in 20g of water was added dropwise to system 1 within 3 hours to obtain system 2.

[0050] 3. Heat system 2 to 90°C, keep it warm for 1.5h, cool down to room temperature, adjust the pH value to about 8, and filter out.

[0051] 4. Add 9g of XR100 to system 3, and coat the film within 2 hours.

[0052]

[0053] Examples mentioned in the average T g Calculated according to the FOX equation; MFFT is the minimum film-forming temperature tester; the high-temperature back tack is that the coating film surface and the coating film surface are attached together at t...

Embodiment 3

[0055] 1. Add 80g of Johnson resin J-696, 4g of allylamine, and 385.3g of water into the reaction kettle, stir until completely dissolved, and raise the temperature to 80°C to obtain system 1.

[0056] 2. Mix 102.5g of styrene, 15g of methyl methacrylate, 67g of n-butyl acrylate, 26g of n-butyl methacrylate and 2.05g of methacrylic acid, and add them dropwise to system 1 in 3 hours, and dissolve the 0.6g of ammonium persulfate in 20g of water was added dropwise to system 1 within 3 hours to obtain system 2.

[0057] 3. Heat system 2 to 90°C, keep it warm for 1.5h, cool down to room temperature, adjust the pH value to about 8, and filter out.

[0058] 4. Add 9g of XR100 to system 3, and coat the film within 2 hours.

[0059]

[0060] Examples mentioned in the average T g Calculated according to the FOX equation; MFFT is the minimum film-forming temperature tester; the high-temperature back tack is that the coating film surface and the coating film surface are attached toge...

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Abstract

The invention relates to the technical field of preparation of high polymers, and discloses a preparation method of a water-based acrylate emulsion for a coating. The preparation method comprises the following steps: taking a high-Tg water soluble acrylic solid resin as a protective colloid, neutralizing the carboxyl on the solid resin by using an amine with the carbon-carbon double bond to form an ammonium salt structure so that the water-based acrylic resin is dissolved into water to achieve the effect of an amphoteric emulsifier; then adding an acrylate monomer to the system for free radical polymerization. The obtained emulsion has high average Tg without affecting low-temperature film forming of the emulsion, and therefore, the contradiction between high Tg and low MFFT (Minimum Film Forming Temperature) of the emulsion polymer is solved; the product has the advantages such as high hardness, good abrasive resistance, good low-temperature film forming property, satisfied water resistance and solvent resistance, and excellent high-temperature after tackiness resistance; besides, according to the invention, the amine with the carbon-carbon double bond is taken as the neutralizer, so that pollution in the construction and use process is reduced.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a method for preparing a coating water-based acrylate emulsion. Background technique [0002] Because the traditional solvent-based acrylic resin contains a large amount of organic volatile substances (VOC), which can cause photochemical pollution in nature and the destruction of the ozone layer, which is not conducive to people's health, so reducing VOC in the resin has become an inevitable need for environmental protection and the market. . The key to producing low-VOC water-based coatings is to use no or less coalescents in water-based acrylic resins without affecting the coating performance. After increasing the monomer conversion rate to eliminate residual monomer, the first consideration is the glass transition temperature of the acrylate emulsion polymer (ie T g ) and the minimum film forming temperature (ie MFFT) these two parameters. T g Determin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/18C08F220/14C08F220/06C08F2/24C09D125/14
Inventor 许迁
Owner 张家港保税区康得菲尔实业有限公司
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