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A kind of water-based paint for roller coating or spraying and preparation method thereof

A water-based coating and roller coating technology, applied in the coating field, can solve the problems of easy cracking of the coating film surface, adhesion of coalescent agent, emission of volatile organic compounds, etc.

Active Publication Date: 2021-07-30
山东中创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution still has some drawbacks: the coalescing agent slowly diffuses and evaporates from the coating over time, which releases undesired organic compounds into the atmosphere; in addition, the coalescing agent can cause sticking problem, which is not alleviated until a significant amount of coalescing agent leaves the coating
However, benzophenones have some disadvantages
Benzophenones are less effective in improving DPUR performance over time
The photochemically induced crosslinking effect of benzophenone will also be severely reduced under rainy conditions during application
Surfaces prone to cracking due to excessive crosslinking due to high dosage levels of benzophenone
Benzophenones are prone to sublimation, which can lead to volatile organic compound (VOC) emissions
However, VOC emissions remain an issue due to the presence of benzophenones

Method used

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  • A kind of water-based paint for roller coating or spraying and preparation method thereof
  • A kind of water-based paint for roller coating or spraying and preparation method thereof
  • A kind of water-based paint for roller coating or spraying and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0046] Dissolve 5mmol of 4,4'-dichlorobenzophenone, 11mmol of naphthalenemethanol, and 1.2mmol of potassium hydroxide in 100ml of NMP, heat to about 180°C, and track the reaction by TLC. After the reaction is terminated, the reaction system is cooled to room temperature. Vacuum distillation. 100ml of toluene was added to the mixture, washed with 50ml of 5% NaCl solution, separated, and the toluene was distilled off under reduced pressure to obtain compound 1 with a yield of 59%.

[0047]

[0048] 1 H NMR (400MHz, DMSO-d 6 )δ.8.03~8.06(m,CH,naphthalene-6H),7.73(d,CH,benzene-4H),7.55~7.62(m,CH,naphthalene-4H),7.32(t,CH,naphthalene-2H) ,7.03~7.06(m,CH,6H),5.60(s,CH 2 ,4H).

preparation Embodiment 2

[0050] Using similar reaction steps and conditions as in Example 1, replacing naphthalene methanol with corresponding raw materials, the following compounds were prepared with a yield of 66%.

[0051]

[0052] 1 H NMR (400MHz, DMSO-d 6 )δ.8.00~8.08(m,CH,naphthalene-6H),7.73(d,CH,benzene-4H),7.57~7.62(m,CH,naphthalene-4H),7.32(t,CH,naphthalene-2H) ,7.03(m,CH,benzene-4H),6.98(m,CH,naphthalene-2H),4.29(t,CH 2 ,4H),3.54(t,CH 2 ,4H).

preparation Embodiment 3

[0054] Using similar reaction steps and conditions as in Example 1, replacing naphthalene methanol with corresponding raw materials, the following compounds were prepared with a yield of 60%.

[0055]

[0056] 1 HNMR (400MHz, DMSO-d 6 )δ.8.03~8.06(m,CH,naphthalene-6H),7.73(d,CH,benzene-4H),7.55~7.62(m,CH,naphthalene-4H),7.32(t,CH,naphthalene-2H) ,7.06(m,CH,naphthalene-2H),7.03(m,CH,benzene-4H),4.83(d,CH,2H),3.61(m,CH,2H),2.26(s,CH 3 ,12H),1.06(d,CH 3 ,6H).

[0057] The preparation of aqueous emulsion copolymer of the present invention:

[0058] (1) adding monomer, photoinitiator and deionized water to pre-emulsify in a pre-emulsifier to obtain a pre-emulsion;

[0059] (2) Take a small amount of pre-emulsion in a four-neck bottle, heat up to about 70°C, then add a free radical initiator, and react for about 30 minutes to prepare a seed emulsion;

[0060] (3) Raise the temperature to about 80°C, add the remaining emulsion and free radical initiator dropwise, finish drop...

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Abstract

The invention relates to a water-based coating for roller coating or spray coating and a preparation method thereof. The water-based paint is composed of photoinitiator and water-based emulsion copolymer. It is prepared by the following method: mix photoinitiator and polymer monomer, and carry out polymer reaction in the presence of free radical initiator. The water-based paint has good stain resistance.

Description

technical field [0001] The invention relates to the field of paint, in particular, the invention relates to an aqueous paint emulsion and a preparation method thereof. Background technique [0002] For environmental reasons, water-based paints are preferred over solvent-based paints. However, these coatings (eg exterior paints) must satisfy a suitable balance of properties. Harder coatings can often meet the requirements for anti-fouling and anti-blocking (the tendency of painted surfaces to stick to each other when placed on top of each other or placed under pressure, ie, bonding). However, the high Tg polymers that make hard coatings do not form films properly at ambient temperatures, negating other critical requirements such as durability and resistance. The latter problem has been avoided to some extent by the use of additives, in particular coalescents, which have the effect of lowering the minimum film formation temperature of the polymer composition. However, this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/08C09D5/16C08F120/14C08F2/50C07C49/84C07C217/48
CPCC07C49/84C07C217/48C08F2/50C08F120/14C09D5/1662C09D133/08
Inventor 贾荣欣刘晋东
Owner 山东中创新材料科技有限公司