阅读说明：本技术 一种环保耐擦洗涂料 (Environment-friendly scrubbing-resistant coating ) 是由 钟会井 于 2020-08-13 设计创作，主要内容包括：本发明公开一种环保耐擦洗涂料,由如下重量份原料制成：去离子水200-300份、KX-5040分散剂6-10份、增光剂3-7份、钛白粉100-200份、改性淀粉40-80份、填料60-100份、改性醇酸树脂25-30份、助剂0.2-0.3份、氢化蓖麻油0.3-0.5份、阻聚剂5-7份、MD-20消泡剂0.1-0.3份和BEK-500杀菌剂0.1-0.3份；制备该环保耐擦洗涂料的过程中加入的改性淀粉和改性醇酸树脂,改性淀粉间的氢键和相互作用力的束缚作用使溶液形成立体网状结构；引入了双键后的醇酸树脂双键越多,干燥性能越好,因此具有较高的粘度,该环保耐擦洗涂料的原料均低毒或无毒,绿色环保。(The invention discloses an environment-friendly scrubbing-resistant coating which is prepared from the following raw materials in parts by weight: 300 parts of deionized water 200-containing materials, 6-10 parts of KX-5040 dispersing agent, 3-7 parts of gloss enhancer, 200 parts of titanium dioxide 100-containing materials, 40-80 parts of modified starch, 60-100 parts of filler, 25-30 parts of modified alkyd resin, 0.2-0.3 part of auxiliary agent, 0.3-0.5 part of hydrogenated castor oil, 5-7 parts of polymerization inhibitor, 0.1-0.3 part of MD-20 defoaming agent and 0.1-0.3 part of BEK-500 bactericide; modified starch and modified alkyd resin are added in the process of preparing the environment-friendly scrub-resistant coating, and the solution forms a three-dimensional net structure under the constraint action of hydrogen bonds and interaction force among the modified starch; the more double bonds of the alkyd resin after the double bonds are introduced, the better the drying performance is, so that the alkyd resin has higher viscosity, and the raw materials of the environment-friendly scrub resistant coating are low-toxic or non-toxic and are environment-friendly.)

1. The environment-friendly scrubbing-resistant coating is characterized by being prepared from the following raw materials in parts by weight: 300 parts of deionized water 200-containing materials, 6-10 parts of KX-5040 dispersing agent, 3-7 parts of gloss enhancer, 200 parts of titanium dioxide 100-containing materials, 40-80 parts of modified starch, 60-100 parts of filler, 25-30 parts of modified alkyd resin, 0.2-0.3 part of auxiliary agent, 0.3-0.5 part of hydrogenated castor oil, 5-7 parts of polymerization inhibitor, 0.1-0.3 part of MD-20 defoaming agent and 0.1-0.3 part of BEK-500 bactericide;

the environment-friendly scrubbing-resistant coating is prepared by the following steps:

firstly, adding deionized water into a reaction kettle, setting the rotating speed at 800-;

secondly, adjusting the rotating speed to 700-900r/min, adjusting the temperature to 50-60 ℃, adding the filler and the modified alkyd resin into the mixture A, continuing stirring for 10-30min, adding the hydrogenated castor oil and the polymerization inhibitor, and uniformly stirring to obtain a mixture B;

and thirdly, cooling the mixture B to 20-30 ℃, then sequentially adding the MD-20 defoaming agent and the BEK-500 bactericide, stirring for 35-45min, and filtering to retain filtrate, wherein the filtrate is the environment-friendly scrubbing-resistant coating.

2. The environment-friendly scrub resistant coating as claimed in claim 1, wherein the brightener is one or two of H701 and terpolymer acrylic acid-vinyl acetate polymer mixed in any proportion; the filler is calcium carbonate and talcum powder according to the mass ratio of 1: 1-3; the polymerization inhibitor is one or more of tartaric acid, citric acid and phosphoric acid mixed in any proportion.

3. The environment-friendly scrub-resistant coating according to claim 1, wherein the modified starch is prepared by the following steps:

s11, diluting concentrated nitric acid with the mass fraction of 68% by using absolute ethyl alcohol to form nitric acid-ethanol mixed solution with the mass fraction of 30%, mixing carboxymethyl cellulose and the nitric acid-ethanol mixed solution, stirring for 2-3h at the temperature of 20-30 ℃ and the rotation speed of 200-300r/min, filtering and retaining precipitates after stirring, washing the precipitates by using deionized water until the pH value of the washing solution is 5-7, adding the washed precipitates into a sodium hydroxide solution with the mass fraction of 40%, stirring until the precipitates are completely dissolved, adding absolute ethyl alcohol to form floccules, filtering, washing the obtained floccules by using an ethanol solution with the mass fraction of 80% until the pH value of the washing solution is 7, and drying at the temperature of 80-100 ℃ to obtain a mixture C after washing;

s12, adding ethanol with the mass fraction of 95%, sodium hydroxide solution with the mass fraction of 20% and corn starch into a stirring kettle, stirring for 1-2 hours at the temperature of 30-40 ℃ and the rotation speed of 300-400r/min, keeping the temperature and the rotation speed unchanged, adding the mixture C, continuing stirring for 1-2 hours, cooling to 20-25 ℃ after stirring is finished, adjusting the pH value to 6-7 by using 0.1mol/L hydrochloric acid, filtering, washing a filter cake for three times by using the ethanol solution with the mass fraction of 85%, drying to constant weight at the temperature of 50 ℃, drying, crushing, and sieving by using a 100-mesh sieve to obtain the modified starch.

4. The environment-friendly scrub resistant coating as claimed in claim 3, wherein the mass ratio of the nitric acid and ethanol mixed solution to the carboxymethyl cellulose in step S11 is 20-30: 7; in the step S12, the mass ratio of the 95% ethanol by mass fraction, the 20% sodium hydroxide solution by mass fraction, the corn starch and the mixture C is 10: 15: 8: 7-9.

5. The environment-friendly scrub-resistant coating according to claim 1, wherein the modified alkyd resin is prepared by the following steps:

s21, adding linolenic acid, trimethylolpropane and maleic anhydride into a four-neck flask, heating and stirring at the speed of 10 ℃/h under the protection of nitrogen, and keeping the temperature unchanged and continuing stirring for 2-3h when the temperature is increased to 230 ℃; the temperature is reduced to 160 ℃ and 180 ℃, and the mixture is stirred for 1 to 2 hours; reducing the temperature to 150 ℃, adding trimellitic anhydride, keeping the temperature unchanged, and continuing stirring for 5-7 h; after stirring, adding propylene glycol methyl ether and uniformly stirring to obtain a mixture D;

s22, reducing the temperature of the mixture D to 100-120 ℃, sequentially adding methyl methacrylate, styrene, n-butyl methacrylate and diketone acrylamide, keeping the temperature unchanged, continuing stirring for 2h, cooling to 30-40 ℃ after stirring, adding adipic dihydrazide and dimethylethanolamine, stirring for 20-30min, adding deionized water, and stirring uniformly to obtain the modified alkyd resin.

6. The environment-friendly scrub resistant coating of claim 5, wherein the molar mass ratio of the linoleic acid, the trimethylolpropane, the maleic anhydride, the trimellitic anhydride and the propylene glycol methyl ether in step S21 is 1: 1: 1-3: 2: 5-7, wherein the mass ratio of the mixture D, the methyl methacrylate, the styrene, the n-butyl methacrylate, the diketoacrylic amide, the adipic dihydrazide, the dimethylethanolamine and the deionized water in the step S22 is 5: 3: 1: 0.1: 2: 3-5: 3: 20.

Technical Field

The invention belongs to the technical field of paint production, and particularly relates to an environment-friendly scrubbing-resistant paint.

Background

Along with the development of current scientific technology, the improvement of people's living standard puts forward higher and higher requirements on the living environment of people, and along with the enhancement of people's environmental awareness, indoor pollution and VOC are more and more concerned by the public. However, in order to improve the performance of the latex paint, a certain amount of auxiliary agents are required to be added into the paint formula, and in the process of film formation of the paint, the auxiliary agents migrate to the surface of the paint and volatilize organic volatile matters, and in addition, residual monomers in the emulsion also form organic volatile matters, so that the emulsion paint is harmful to the health of people.

The invention patent CN102153923B discloses a high-strength scrub-resistant environment-friendly dry powder emulsion coating, which comprises one or more than one emulsion glue powder with the content of 20-50% w, calcium hydroxide micro powder with the content of 35-70% wt, coloring titanium dioxide with the content of 0-30% wt and an auxiliary agent with the content of 0.05-0.1% wt. Compared with the prior liquid emulsion coating, the dry powder emulsion coating has the advantages that: the dry powder emulsion coating has the advantages of low packaging and transportation cost, 50% lower product cost, obvious economic and social benefits, high film hardness, water resistance, scrubbing resistance, lasting corrosion resistance, environmental friendliness, no toxicity or pollution, resource saving and reduction of the harm of VOC to the environment.

Disclosure of Invention

In order to overcome the technical problems, the invention provides an environment-friendly washable paint and a preparation method thereof.

The technical problems to be solved by the invention are as follows: emulsion paint is widely used as building decorative coating of inner walls, and the emulsion paint uses water as a dispersion medium, which has certain advantages in the aspect of environmental protection, but in order to improve the performance of the emulsion paint, a certain amount of auxiliary agent is required to be added into the paint formula, and in the process of film forming of the paint, the auxiliary agent can migrate to the surface of the paint and volatilize organic volatile matters, and in addition, residual monomers in the emulsion also form organic volatile matters, which are harmful to the health of people.

The purpose of the invention can be realized by the following technical scheme:

an environment-friendly scrubbing-resistant coating is prepared from the following raw materials in parts by weight: 300 parts of deionized water 200-containing materials, 6-10 parts of KX-5040 dispersing agent, 3-7 parts of gloss enhancer, 200 parts of titanium dioxide 100-containing materials, 40-80 parts of modified starch, 60-100 parts of filler, 25-30 parts of modified alkyd resin, 0.2-0.3 part of auxiliary agent, 0.3-0.5 part of hydrogenated castor oil, 5-7 parts of polymerization inhibitor, 0.1-0.3 part of MD-20 defoaming agent and 0.1-0.3 part of BEK-500 bactericide;

the environment-friendly scrubbing-resistant coating is prepared by the following steps:

firstly, adding deionized water into a reaction kettle, setting the rotating speed at 800-;

secondly, adjusting the rotating speed to 700-900r/min, adjusting the temperature to 50-60 ℃, adding the filler and the modified alkyd resin into the mixture A, continuing stirring for 10-30min, adding the hydrogenated castor oil and the polymerization inhibitor, and uniformly stirring to obtain a mixture B;

and thirdly, cooling the mixture B to 20-30 ℃, then sequentially adding the MD-20 defoaming agent and the BEK-500 bactericide, stirring for 35-45min, and filtering to retain filtrate, wherein the filtrate is the environment-friendly scrubbing-resistant coating.

Wherein, the brightener is one or two of H701 and terpolymer acrylic acid-vinegar polymer which are mixed according to any proportion; the filler is calcium carbonate and talcum powder according to the mass ratio of 1: 1-3; the polymerization inhibitor is one or more of tartaric acid, citric acid and phosphoric acid mixed in any proportion.

Wherein, the modified starch is prepared by the following steps:

s11, diluting concentrated nitric acid with the mass fraction of 68% by using absolute ethyl alcohol to form nitric acid-ethanol mixed solution with the mass fraction of 30%, mixing carboxymethyl cellulose and the nitric acid-ethanol mixed solution, stirring for 2-3h at the temperature of 20-30 ℃ and the rotation speed of 200-300r/min, filtering and retaining precipitates after stirring, washing the precipitates by using deionized water until the pH value of the washing solution is 5-7, adding the washed precipitates into a sodium hydroxide solution with the mass fraction of 40%, stirring until the precipitates are completely dissolved, adding absolute ethyl alcohol to form floccules, filtering, washing the obtained floccules by using an ethanol solution with the mass fraction of 80% until the pH value of the washing solution is 7, and drying at the temperature of 80-100 ℃ to obtain a mixture C after washing;

s12, adding ethanol with the mass fraction of 95%, sodium hydroxide solution with the mass fraction of 20% and corn starch into a stirring kettle, stirring for 1-2 hours at the temperature of 30-40 ℃ and the rotation speed of 300-400r/min, keeping the temperature and the rotation speed unchanged, adding the mixture C, continuing stirring for 1-2 hours, cooling to 20-25 ℃ after stirring is finished, adjusting the pH value to 6-7 by using 0.1mol/L hydrochloric acid, filtering, washing a filter cake for three times by using the ethanol solution with the mass fraction of 85%, drying to constant weight at the temperature of 50 ℃, drying, crushing, and sieving by using a 100-mesh sieve to obtain the modified starch.

Wherein the mass ratio of the nitric acid-ethanol mixed solution to the carboxymethyl cellulose in the step S11 is 20-30: 7; in the step S12, the mass ratio of the 95% ethanol by mass fraction, the 20% sodium hydroxide solution by mass fraction, the corn starch and the mixture C is 10: 15: 8: 7-9.

Wherein the modified alkyd resin is prepared by the following steps:

s21, adding linolenic acid, trimethylolpropane and maleic anhydride into a four-neck flask, heating and stirring at the speed of 10 ℃/h under the protection of nitrogen, and keeping the temperature unchanged and continuing stirring for 2-3h when the temperature is increased to 230 ℃; the temperature is reduced to 160 ℃ and 180 ℃, and the mixture is stirred for 1 to 2 hours; reducing the temperature to 150 ℃, adding trimellitic anhydride, keeping the temperature unchanged, and continuing stirring for 5-7 h; after stirring, adding propylene glycol methyl ether and uniformly stirring to obtain a mixture D;

s22, reducing the temperature of the mixture D to 100-120 ℃, sequentially adding methyl methacrylate, styrene, n-butyl methacrylate and diketone acrylamide, keeping the temperature unchanged, continuing stirring for 2h, cooling to 30-40 ℃ after stirring, adding adipic dihydrazide and dimethylethanolamine, stirring for 20-30min, adding deionized water, and stirring uniformly to obtain the modified alkyd resin.

In step S21, the molar mass ratio of the linolenic acid, the trimethylolpropane, the maleic anhydride, the trimellitic anhydride, and the propylene glycol monomethyl ether is 1: 1: 1-3: 2: 5-7, wherein the mass ratio of the mixture D, the methyl methacrylate, the styrene, the n-butyl methacrylate, the diketoacrylic amide, the adipic dihydrazide, the dimethylethanolamine and the deionized water in the step S22 is 5: 3: 1: 0.1: 2: 3-5: 3: 20.

the invention has the beneficial effects that:

the nitric acid-ethanol mixture is mixed with the carboxymethyl cellulose, so that the decomposition degree of the carboxymethyl cellulose is reduced, gel formation after the carboxymethyl cellulose absorbs water is avoided, and the chloride content and the lead content are greatly reduced after the carboxymethyl cellulose is washed by ethanol; the modified starch after carboxymethyl is enhanced in hydrophilicity, the substituent group is increased, namely the content of carboxymethyl is increased, so that the starch molecule is negatively charged, the chain segments have repulsion action due to the same charge, and the solution forms a huge three-dimensional network structure by the constraint action of hydrogen bonds and interaction force among the modified starch, so that the modified starch has higher viscosity.

The double bonds are introduced into the structure of the alkyd resin by maleic anhydride, the grafting rate of the acrylate monomer to the alkyd resin is improved, the alkyd resin is formed into a film mainly by means of oxidative crosslinking of the double bonds, the more the double bonds of the alkyd resin are introduced, the better the drying performance is, the diacetone acrylamide is subjected to reaction with adipic dihydrazide, and is interpenetrated with the oxidative crosslinking network structure of the alkyd resin to form a double-network structure, so that the crosslinking degree is further improved.

The modified starch and the modified alkyd resin added in the process of preparing the environment-friendly scrub resistant coating improve the viscosity strength of the coating, and the raw materials of the environment-friendly scrub resistant coating are low-toxic or non-toxic and are environment-friendly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.