CN112812634A

CN112812634A - Water-based vacuum cup baking paint and preparation method thereof

Info

Publication number: CN112812634A
Application number: CN202011582109.2A
Authority: CN
Inventors: 祝玉芹; 盛贻林; 王方园; 程外亮; 胡萍萍
Original assignee: Zhejiang Largos Chemical Industry Co ltd
Current assignee: Zhejiang Largos Chemical Industry Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-05-18

Abstract

The invention discloses a water-based vacuum cup baking paint which comprises the following components in percentage by weight: 18-20% of deionized water, 0-0.02% of multifunctional regulator, 1-5% of water-based dispersant, 0.02-0.08% of water-based defoamer, 0.01-0.04% of bactericide, 0.1-0.4% of cosolvent, 0-0.12% of anti-settling agent, 2-30% of pigment, 40-65% of water-based matrix resin, 5-10% of water-based cross-linking agent, 0.12-0.18% of water-based leveling shrinkage-preventing aid, 0.12-0.18% of water-based wetting and leveling agent, 1.8-2.7% of adhesive force aid and 0.15-0.3% of anti-flash-corrosion aid, wherein the water-based matrix resin is an acrylic dispersion with VOC (volatile organic compound) of. The VOC of the product is below 10%, so that the product not only meets the performance requirements of customers on the heat-insulating paint, but also is environment-friendly and safe, and the preparation process is simple and convenient to operate.

Description

Water-based vacuum cup baking paint and preparation method thereof

Technical Field

The invention relates to the technical field of environment-friendly water-based baking paint, in particular to water-based vacuum cup baking paint and a preparation method thereof.

Background

At present, the market of waterborne metal baking paint products mainly comprises water-soluble coatings and water-dilutable coatings, and the coatings contain a certain amount of organic solvent because the matrix resin is converted from solvent-based resin, so that the VOC content in the products is still not low, generally at least more than 20%, and is called as 'pseudo-waterborne', and on the basis of the situation, the market of the vacuum cup paint is urgently in need of more environment-friendly waterborne baking paint products with the VOC controlled below 10%.

Disclosure of Invention

The invention aims to provide a water-based vacuum cup baking varnish and a preparation method thereof, which screen out water-based dispersion resin containing an extremely low organic solvent, and develops the water-based baking varnish for cups with VOC below 10% by selecting and matching other environment-friendly water-based raw materials, water-based auxiliary agents and the like through a series of tests, thereby solving the problems of insufficient environment protection and higher VOC content of water-based baking varnish products in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a water-based vacuum cup baking paint, which comprises the following components in percentage by weight:

acrylic dispersions having a VOC of less than or equal to 5%.

Preferably, the aqueous matrix resin is 5060 polyacrylate dispersoid resin in the Yu chemical industry or KW-8753 polyacrylate dispersoid resin in the deep bamboo chemical industry. The two dispersion resins selected strictly have close performance after paint making, and the slight difference is that the odor of the organic solvent is less than 5%, compared with that of the 5060 polyacrylate dispersion resin, the odor is smaller, which is caused by different raw materials used for producing the dispersion, and the two dispersion resins can be selected according to the odor requirement of customers.

Preferably, the aqueous cross-linking agent is a 303 amino resin in the chemical industry of stained austin or a 325 amino resin in the chemical industry of asahi, and the dosage ratio of the two is 6: 5. the 325 amino resin can provide faster curing speed due to high imino content, and the 303 amino resin can avoid the generation of micro bubbles in a paint film caused by too fast curing reaction.

Preferably, the aqueous dispersant is BYK-190 dispersant, SN-1790 dispersant of deep bamboo chemical industry or 4585 acrylic block copolymer dispersant of Xin chemical industry. Has good wetting dispersibility and is suitable for dispersing pigments in an aqueous system.

Preferably, the pigment is titanium dioxide, carbon black powder, permanent red or phthalocyanine blue. The selection of the pigment is based on the comprehensive consideration of the covering power, tinting strength, density, oil absorption, fineness, weather resistance, light resistance, environment friendliness without heavy metals and the like of the pigment. Further, the color ratio (P/B) of the formula is determined according to the requirements on the color and the covering power of the pigment, wherein the white water-based vacuum cup baking paint P/B is approximately equal to 1: 1, black water-based vacuum cup baking paint P/B is approximately equal to 0.08: 1, the red water-based thermos cup baking paint P/B is approximately equal to 0.24:1, and the blue water-based thermos cup baking paint P/B is approximately equal to 0.24: 1.

Preferably, the cosolvent is dipropylene glycol methyl ether (DPM for short) or diethylene glycol butyl ether. The application of dipropylene glycol methyl ether or diethylene glycol butyl ether mainly promotes the affinity wetting of the pigment surface to water, assists the water-based dispersant to quickly wrap the pigment surface, adjusts the surface performance of the pigment, accelerates the dispersion speed, achieves the qualified pigment fineness and keeps stable.

Preferably, the bactericide is 1, 2-benzisothiazolin-3-one. The 1, 2-benzisothiazolin-3-one is an isothiazolinone compound with long-acting bactericidal effect.

Preferably, the multifunctional regulator is N, N-dimethylethanolamine, DMEA for short, has a multifunctional regulating effect, and can be used for optimally regulating the performances of the resin such as dissolving capacity, dissolving parameters, relative volatilization rate, boiling point and the like after being added.

Preferably, the anti-settling agent is organically modified hectorite clay or bentonite. In some white paint formulations, due to the high requirements, the titanium dioxide used for covering is added in large amounts, and in order to prevent pigment precipitation, organically modified hectorite clay or bentonite is added as an anti-settling agent. In other color paint formulations, due to the low pigment content and low specific gravity, no anti-settling agent may be added.

Preferably, the adhesion promoter is HX-6023 polyester phosphate ester of Dahlian chemistry. The base resin of the product provides basic adhesion performance to a metal substrate, and the wet and hot adhesion performance of the product during a cooking test is improved by adding HX-6023 polyester phosphate adhesion promoter.

Preferably, the anti-flash corrosion auxiliary agent is SN-9779 organic zinc chelate of deep bamboo chemical industry. Considering that the substrate generates flash rust phenomenon to some metal ions of the substrate in the period from the time of spraying the water-based vacuum cup baking paint to the time of baking and volatilizing to form a film, the final performance is that white spots can be penetrated out quickly when a boiling test is carried out after a paint film is dried, and the requirement can not be met when the adhesive tape is pulled out. By adding a proper amount of anti-flash corrosion auxiliary agent, the white spots in cooking can be avoided, the cooking performance is improved, and the best addition amount is 0.15-0.3% obtained through tests. The anti-flash corrosion agent is a compound salt substance, so that the flash corrosion phenomenon belongs to the field of electrochemical action, the adopted anti-flash corrosion agent is a substance with reduction to release negative charges to play a role in corrosion inhibition, ions contained in the substance have strong reduction effect, and excessive use amount can cause that some ions are remained on a paint film to reduce the boiling resistance of the paint film and influence the storage stability.

Preferably, the aqueous defoamer is a BYK-024 defoamer or a TegoAirex904W defoamer. These selected defoamers are aqueous, environmentally friendly and have good defoaming capability.

Preferably, the aqueous leveling shrinkage-proof auxiliary agent is Tego270 polyether siloxane copolymer or SN-4727 polyether modified siloxane in deep bamboo chemical industry. The selected water-based leveling shrinkage-proof auxiliary agent is water-based and environment-friendly, and has a better leveling shrinkage-proof effect.

Preferably, the water-based wetting and leveling agent is BYK-346 polyether modified siloxane of Pico chemistry.

In a second aspect, the invention also provides a preparation method of the water-based vacuum cup baking paint, which comprises the following steps:

(1) weighing raw materials according to the weight proportion of the raw materials, adding part of deionized water into a container, gradually adding a multifunctional regulator, a water-based dispersant, a water-based defoamer, a bactericide, a cosolvent, an anti-settling agent and a pigment, uniformly dispersing for 30 minutes at a rotating speed of 500-800 r/min by adopting a high-speed stirring and dispersing sand mill, and grinding to the fineness of less than or equal to 20 microns;

(2) after the fineness is ground to be qualified, sequentially adding the water-based matrix resin, the water-based cross-linking agent, the water-based leveling shrinkage-resistant auxiliary agent, the water-based wetting and leveling agent, the adhesive force auxiliary agent and the anti-flash corrosion auxiliary agent, and stirring and dispersing at the rotating speed of 500-800 r/min for 20min to uniformly disperse the mixture;

(3) slowly adding the rest deionized water, uniformly stirring at a rotating speed of 500-800 r/min, and adjusting the viscosity to a qualified range;

(4) and after the viscosity is adjusted to be qualified, filtering the mixture by using filter cloth with more than 360 meshes, and packaging the mixture to obtain the water-based vacuum cup baking paint.

Compared with the prior art, the invention provides the water-based vacuum cup baking paint and the preparation method thereof, and the water-based vacuum cup baking paint has the following beneficial effects:

the invention selects the waterborne acrylic dispersion resin with the VOC of less than or equal to 5 percent, develops the cup waterborne baking paint with the VOC of less than 10 percent by matching with a waterborne cross-linking agent, other environment-friendly waterborne raw materials, a waterborne auxiliary agent and the like, can provide corresponding functional effects by various auxiliary agents, has better compatibility with a formula system, has simple preparation process and convenient operation, meets the performance requirements of customers on the heat-insulating paint, and is environment-friendly and safe.

Detailed Description

The technical solutions of the present invention will be described clearly and completely by the detailed embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The use of the main raw materials in the following examples is shown in Table 1 below.

TABLE 1

The following examples and the instrumentation used in the tests are shown in table 2 below.

TABLE 2

Device and instrument name	Model number	Manufacturer of the product
			Electronic balance	HLD-10002	Hangzhou Yongheng weighing Equipment Co Ltd
High-speed dispersing sand mill	SF intelligence model	Shanghai Modern Environmental Engineering Technology Co.,Ltd.
			Scraper blade fineness gauge	QXD-50	Shanghai Modern Environmental Engineering Technology Co.,Ltd.
Mirror-direction glossiness instrument	XGP	Tianjin City Xintong Songhua technologies Co Ltd
			Viscometer	Scribble-4 #
Pendulum rod sclerometer	QBY	Tianjin Sen Ridad test Equipment Co Ltd
			Paint film adhesive force experimental instrument	QFZ	Tianjin Sen Ridad test Equipment Co Ltd
Paint film impactor	BGD304	Guangzhou Dageda laboratory products Ltd
			Paint film bending tester	QTZ	Tianjin Sen Ridad test Equipment Co Ltd
Paint film thickness gauge	MiniTest600B	German ERK
			Dish washing machine	WQP6-V9	QINGDAO HAIER DISHWASHER Co.,Ltd.

Example 1

This example provides a white waterborne vacuum cup baking finish having the composition shown in Table 3 below.

The preparation method of the white water-based vacuum cup baking paint comprises the following steps:

(1) weighing the raw materials according to the weight ratio of the raw materials in the table 3, adding 9.4% of deionized water into a container, gradually adding a water-based dispersant 4585, a water-based defoamer BYK-024, a bactericide SNB9750, a cosolvent DPM, an anti-settling agent BentoniE and titanium dioxide R-606, uniformly dispersing for 30 minutes at a rotating speed of 500-800R/min by adopting a high-speed stirring and dispersing sand mill, and grinding the mixture to the fineness of less than or equal to 20 microns.

(2) After the fineness is ground to be qualified, sequentially adding the water-based matrix resin 5060, the water-based cross-linking agents 303 and 325, the water-based leveling shrinkage-proof auxiliary SN-4727, the water-based wetting leveling agent BYK-346, the adhesive force auxiliary HX-6023 and the anti-flash corrosion auxiliary SN-9779, and stirring and dispersing at the rotating speed of 500-800 r/min for 20min to ensure that the materials are uniformly dispersed.

(3) Slowly adding the rest 9.14 percent of deionized water, uniformly stirring at the rotating speed of 500-800 r/min, and adjusting the viscosity to a qualified range (coating a No. 4 viscosity cup at 25 ℃ for 50-90 seconds); when the viscosity is adjusted, the deionized water can be added in a fine adjustment mode according to the viscosity.

(4) And after the viscosity is adjusted to be qualified, filtering the mixture by using filter cloth with more than 360 meshes, and packaging the mixture to obtain the white water-based vacuum cup baking paint. And (5) storing the packaged water-based vacuum cup baking varnish in a sealed and shady place.

Example 2

This example provides a black waterborne vacuum cup baking finish having the composition shown in table 3 below.

The preparation method of the black water-based vacuum cup baking paint comprises the following steps:

(1) weighing the raw materials according to the weight ratio of the raw materials in the table 3, adding 5.65% of deionized water into a container, gradually adding a multifunctional regulator DMEA, a water-based dispersant 4585, a water-based defoamer BYK-024, a bactericide SNB9750, a cosolvent DPM and carbon black powder HM15, uniformly dispersing for 30 minutes at a rotating speed of 500-800 r/min by adopting a high-speed stirring and dispersing sand mill, and grinding the mixture to the fineness of less than or equal to 20 microns.

(3) Slowly adding the rest 13.77 percent of deionized water, uniformly stirring at the rotating speed of 500-800 r/min, and adjusting the viscosity to a qualified range (coating a-4 # viscosity cup at 25 ℃ for 50-90 seconds); when the viscosity is adjusted, the deionized water can be added in a fine adjustment mode according to the viscosity.

(4) And after the viscosity is adjusted to be qualified, filtering the mixture by using filter cloth with more than 360 meshes, and packaging the mixture to obtain the black water-based vacuum cup baking paint. And (5) storing the packaged water-based vacuum cup baking varnish in a sealed and shady place.

Example 3

This example provides a red waterborne vacuum cup baking finish having the composition shown in table 3 below.

The preparation method of the red water-based vacuum cup baking paint comprises the following steps:

(1) weighing the raw materials according to the weight ratio of the raw materials in the table 3, adding 6.72% of deionized water into a container, gradually adding a multifunctional regulator DMEA, a water-based dispersant 4585, a water-based defoamer BYK-024, a bactericide SNB9750, a cosolvent DPM and permanent red F3RK, uniformly dispersing for 30 minutes at a rotating speed of 500-800 r/min by adopting a high-speed stirring dispersion sand mill, and grinding to the fineness of less than or equal to 20 microns.

(3) Slowly adding the rest 12.24 percent of deionized water, uniformly stirring at the rotating speed of 500-800 r/min, and adjusting the viscosity to a qualified range (coating a-4 # viscosity cup at 25 ℃ for 50-90 seconds); when the viscosity is adjusted, the deionized water can be added in a fine adjustment mode according to the viscosity.

(4) And after the viscosity is adjusted to be qualified, filtering the mixture by using filter cloth with more than 360 meshes, and packaging the mixture to obtain the red water-based vacuum cup baking paint. And (5) storing the packaged water-based vacuum cup baking varnish in a sealed and shady place.

Example 4

This example provides a blue waterborne vacuum cup baking finish having the composition shown in table 3 below.

The preparation method of the blue water-based vacuum cup baking paint comprises the following steps:

(1) weighing the raw materials according to the weight ratio of the raw materials in the table 3, adding 6.72% of deionized water into a container, gradually adding a multifunctional regulator DMEA, a water-based dispersant 4585, a water-based defoamer BYK-024, a bactericide SNB9750, a cosolvent DPM and phthalocyanine blue 8631, uniformly dispersing for 30 minutes at a rotating speed of 500-800 r/min by adopting a high-speed stirring and dispersing sand mill, and grinding to the fineness of less than or equal to 20 microns.

(4) And after the viscosity is adjusted to be qualified, filtering the mixture by using filter cloth with more than 360 meshes, and packaging the mixture to obtain the blue water-based vacuum cup baking paint. And (5) storing the packaged water-based vacuum cup baking varnish in a sealed and shady place.

Example 5

(1) weighing the raw materials according to the weight proportion of the raw materials in the table 3, adding 9.4% of deionized water into a container, gradually adding a multifunctional regulator DMEA, a water-based dispersant BYK-190, a water-based defoaming agent BYK-024, a bactericide SNB9750, a cosolvent DPM, an anti-settling agent Bentone DE and titanium dioxide R-606, uniformly dispersing for 30 minutes at a rotation speed of 500-800R/min by adopting a high-speed stirring and dispersing sand mill, and grinding the fineness to be less than or equal to 20 mu m.

(3) Slowly adding the rest 9.12 percent of deionized water, uniformly stirring at the rotating speed of 500-800 r/min, and adjusting the viscosity to a qualified range (coating a No. 4 viscosity cup at 25 ℃ for 50-90 seconds); when the viscosity is adjusted, the deionized water can be added in a fine adjustment mode according to the viscosity.

Example 6

(1) weighing the raw materials according to the weight ratio of the raw materials in the table 3, adding 9.4% of deionized water into a container, gradually adding a water-based dispersant SN-1790, a water-based defoamer TegoAirex904W, a bactericide SNB9750, a cosolvent diethylene glycol butyl ether, an anti-settling agent HF-140 and titanium dioxide R-606, uniformly dispersing for 30 minutes at a rotating speed of 500-800R/min by adopting a high-speed stirring and dispersing sand mill, and grinding the fineness to be less than or equal to 20 mu m.

(2) After the fineness is ground to be qualified, sequentially adding an aqueous matrix resin KW-8753, aqueous cross-linking agents 303 and 325, an aqueous leveling shrinkage-proof auxiliary Tego270, an aqueous wetting leveling agent BYK-346, an adhesive force auxiliary HX-6023 and an anti-flash corrosion auxiliary SN-9779, and stirring and dispersing at the rotating speed of 500-800 r/min for 20min to ensure that the mixture is uniformly dispersed.

The waterborne vacuum cup baking varnish prepared in the embodiments 1 to 6 is used for construction and performance detection.

And (3) construction description: the workpiece needs to be degreased, derusted and polished before spraying, and dust-free cleaning and drying are ensured.

Spraying construction viscosity: stirring evenly before spraying, diluting with deionized water to viscosity: coating the No. 4 cup at 25 ℃ for 20-30 seconds.

Controlling the thickness of a paint film: 20 to 30 μm.

Baking temperature: 150 ℃ for 20 minutes.

The performance and effect of the waterborne vacuum cup baking varnish prepared in the embodiments 1 to 6 are shown in the following table 4.

TABLE 3

TABLE 4

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The water-based vacuum cup baking paint is characterized by comprising the following components in percentage by weight:

the aqueous matrix resin is an acrylic dispersion with VOC less than or equal to 5%.

2. The aqueous vacuum cup baking finish of claim 1, wherein the aqueous matrix resin is 5060 polyacrylate dispersion resin of chemical industry or KW-8753 polyacrylate dispersion resin of deep bamboo chemical industry.

3. The aqueous thermos cup baking finish of claim 1, wherein the aqueous cross-linking agent is a 303 amino resin of the stained austin chemical industry or a 325 amino resin of the asahi chemical industry, in a ratio of 6: 5.

4. the aqueous thermos cup baking varnish according to claim 1, wherein the aqueous dispersant is BYK-190 dispersant, SN-1790 dispersant of deep bamboo chemical industry or 4585 acrylic block copolymer dispersant of Xin chemical industry.

5. The aqueous vacuum cup baking paint of claim 1, wherein the pigment is titanium dioxide, carbon black powder, permanent red or phthalocyanine blue, and the cosolvent is dipropylene glycol methyl ether or diethylene glycol butyl ether.

6. The aqueous thermos cup baking finish of claim 1, wherein the bactericide is 1, 2-benzisothiazolin-3-one, the multifunctional modifier is N, N-dimethylethanolamine, and the anti-settling agent is an organically modified hectorite clay or bentonite.

7. The waterborne vacuum cup baking finish of claim 1, wherein the adhesion promoter is HX-6023 polyester phosphate ester by darts chemical.

8. The waterborne vacuum cup baking paint of claim 1, wherein the anti-flash additive is SN-9779 organic zinc chelate of deep bamboo chemical industry.

9. The waterborne vacuum cup baking varnish of claim 1, wherein the waterborne defoamer is a BYK-024 defoamer or a Tego Airex904W defoamer, the waterborne leveling shrinkage-proof assistant is Tego270 polyether siloxane copolymer or SN-4727 polyether modified siloxane in deep bamboo chemical industry, and the waterborne wetting and leveling agent is BYK-346 polyether modified siloxane in Pico chemistry.

10. The preparation method of the water-based vacuum cup baking paint as claimed in claim 1, which is characterized by comprising the following steps:

(2) after the fineness is ground to be qualified, sequentially adding the water-based matrix resin, the water-based cross-linking agent, the water-based leveling shrinkage-proof auxiliary agent, the water-based wetting and leveling agent, the adhesive force auxiliary agent and the anti-flash corrosion auxiliary agent, and stirring and dispersing at the rotating speed of 500-800 r/min for 20min to uniformly disperse the mixture;