CN115595052A - Anti-doodling powder coating and preparation method thereof - Google Patents
Anti-doodling powder coating and preparation method thereof Download PDFInfo
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- CN115595052A CN115595052A CN202211125430.7A CN202211125430A CN115595052A CN 115595052 A CN115595052 A CN 115595052A CN 202211125430 A CN202211125430 A CN 202211125430A CN 115595052 A CN115595052 A CN 115595052A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of powder coatings, in particular to an anti-doodling powder coating and a preparation method thereof, wherein the anti-doodling powder coating comprises the following components in parts by weight: 30-60 parts of water-based resin, 2-5 parts of curing agent, 0.1-3 parts of catalyst, 0-6 parts of sizing agent and 8-20 parts of additive, wherein the additive comprises the following components in parts by weight: methyl hydrogen silicone oil a, hydroxyl silicone oil b, glycerol modified organic silicon c and polyorganosiloxane d, wherein a, b, c and d are parts by weight of corresponding components respectively and satisfy the following conditions: (0.4a + 0.1d)/(0.2c + 0.3b) =1. The anti-graffiti powder coating disclosed by the invention can obtain excellent graffiti resistance while ensuring the basic coating performance of the coating.
Description
Technical Field
The invention relates to the technical field of powder coatings, and particularly relates to an anti-doodling powder coating and a preparation method thereof.
Background
In recent years, various small advertisements and wild advertisements which are scrawled, scrawled and pasted are more and more concerned by people, and the scrawling not only affects the appearance of the city and the landscape, but also has huge cost for removing the scrawling in various countries. These graffiti advertisements have been regarded as "urban cowhide delicacy" affecting the appearance of the city, and have become a persistent ailment that is difficult to cure in every city across the country.
The anti-graffiti coating is self-cleaning and stain-resistant, the water-based coating is green and environment-friendly, and the combination of the anti-graffiti coating and the water-based coating is a key development direction of modern functional coating products. However, the water-based anti-graffiti coating still has many application problems to be solved urgently. Firstly, negative factors such as emulsifiers, wetting agents etc. in the aqueous phase make it difficult for hydrophobic coatings to show good anti-graffiti effects, which also leads to intolerance of such coatings to physical abrasion. In addition, if the water-based coating needs to show excellent anti-graffiti effect, high-content fluorosilicone resin (10-30 wt%) is often selected, the economy and the high efficiency of materials are not reflected, and the requirements of low carbon and environmental protection are not met.
Therefore, there is a need to find an anti-graffiti powder coating that has excellent anti-graffiti and scrub resistance effects, thereby solving the above problems.
Disclosure of Invention
The invention aims to overcome the defect that the water-based paint in the prior art is not graffiti-resistant, and provides an anti-graffiti powder paint and a preparation method thereof.
In order to achieve the above object, the invention provides in a first aspect an anti-graffiti powder coating comprising the following components in parts by weight: 30-60 parts of water-based resin, 2-5 parts of curing agent, 0.1-3 parts of catalyst, 0-6 parts of sizing agent and 8-20 parts of additive, wherein the additive comprises the following components in parts by weight: methyl hydrogen silicone oil a, hydroxyl silicone oil b, glycerol modified organic silicon c and polyorganosiloxane d, wherein a, b, c and d are parts by weight of corresponding components respectively and satisfy the following conditions: (0.4a + 0.1d)/(0.2c + 0.3b) =1; wherein the glycerin-modified silicone has a long-chain alkyl group, has a monovalent hydrocarbon group in a proportion of 35 mass% or less in the molecule, has only a glycerin group as a hydrophilic group, and has no other hydrophilic group; the polyorganosiloxane has at least two hydroxyl groups or hydrolyzable groups bonded to a silicon atom per molecule.
Wherein preferably, the weight ratio of the additive to the water-based resin is 0.2-0.5.
Wherein preferably, the weight ratio of the additive to the water-based resin is 0.2-0.3.
Wherein preferably, the kinematic viscosity of the methyl hydrogen silicone oil at 25 ℃ is 80-120mm 2 /s。
Wherein preferably, the dynamic viscosity of the hydroxyl silicone oil at 25 ℃ is 1200-1500 mPa.
Wherein, preferably, the content of the glycerin radical in the glycerin-modified organosilicon is 3-6wt% of the total weight of the glycerin-modified organosilicon.
Wherein preferably, the polyorganosiloxane contains hydroxyl group in an amount of 5 to 8wt% based on the total weight of the polyorganosiloxane.
Wherein preferably the hydrolysable groups in the polyorganosiloxane are ester groups.
In a second aspect, the present invention provides a method for preparing the anti-graffiti powder coating of the first aspect, comprising the following steps:
(1) Uniformly mixing methyl hydrogen silicone oil and hydroxyl silicone oil to obtain a first mixture;
(2) Mixing the glycerol modified organic silicon and the polysiloxane uniformly to obtain a second mixture;
(3) After the first mixture and the second mixture are subjected to third mixing, adding an aqueous resin for fourth mixing; then the curing agent, catalyst and slurry are added for a fifth mixing.
Preferably, the conditions of the first blending, the second blending, the third mixing and the fourth mixing each independently include: stirring at 300-600r/min for 15-25min; the fifth mixing conditions include: the stirring speed is 100-200r/min, and the time is 20-40min.
Compared with the prior art, the anti-doodling powder coating provided by the invention is prepared by adding the following additives in specific components: the paint is characterized by comprising methylhydrogen silicone oil a, hydroxyl silicone oil b, glycerol modified organic silicon c and polyorganosiloxane d, wherein a, b, c and d meet the specific formula, and the paint can obtain excellent anti-graffiti performance while ensuring the basic coating performance of the paint by matching with other technical characteristics. After the water-based pen and the oil-based pen are coated on a base material, the water-based pen and the oil-based pen have excellent anti-falling performance, high hardness and smooth surfaces, common water-based pens and oil-based pens can not scrawl basically, and even if the water-based pens and the oil-based pens with high corrosivity can partially scrawl, the water-based pens and the oil-based pens can be easily erased by using an aqueous detergent. The anti-graffiti powder coating does not contain environmentally-friendly components such as fluorine-containing silicone resin and the like, can have excellent anti-graffiti performance without adding an emulsifier and a wetting agent, and has coating performance meeting requirements. Under the same conditions, if a, b, c and d do not satisfy the above specific formula or if the additive does not contain any of the above components, the effects of the present invention cannot be achieved.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides an anti-doodling powder coating in a first aspect, which comprises the following components in parts by weight: 30-60 parts of water-based resin, 2-5 parts of curing agent, 0.1-3 parts of catalyst, 0-6 parts of slurry and 8-20 parts of additive, wherein the additive comprises the following components: methyl hydrogen silicone oil a, hydroxyl silicone oil b, glycerol modified organic silicon c and polyorganosiloxane d, wherein a, b, c and d are parts by weight of corresponding components respectively and satisfy the following conditions: (0.4a + 0.1d)/(0.2c + 0.3b) =1.
Wherein the glycerin-modified silicone has a long-chain alkyl group, has a monovalent hydrocarbon group in a proportion of 35 mass% or less in the molecule, has only a glycerin group as a hydrophilic group, and has no other hydrophilic group; the polyorganosiloxane has at least two hydroxyl groups or hydrolyzable groups bonded to a silicon atom per molecule.
Wherein preferably, the weight ratio of the additive to the aqueous resin is 0.2-0.5. Under this preferred scheme, additive and waterborne resin ratio are more suitable, more do benefit to the anti-graffiti performance that promotes anti-graffiti powder coating.
Wherein preferably, the weight ratio of the additive to the water-based resin is 0.2-0.3.
Wherein preferably, the kinematic viscosity of the methyl hydrogen silicone oil at 25 ℃ is 80-120mm 2 And s. In the invention, the specific type of the methyl hydrogen silicone oil can achieve the effect of the invention as long as the specific kinematic viscosity is met; the person skilled in the art can select methylhydrosilicone oils as required under conditions which meet this particular kinematic viscosity.
Wherein preferably, the dynamic viscosity of the hydroxyl silicone oil at 25 ℃ is 1200-1500mPa & s. In the invention, the specific type of the hydroxyl silicone oil can achieve the effect of the invention as long as the specific dynamic viscosity is met; one skilled in the art can select the hydroxy silicone oil under the conditions to meet the specific kinematic viscosity according to the needs.
Wherein, preferably, the content of the glycerin radical in the glycerin-modified organosilicon is 3-6wt% of the total weight of the glycerin-modified organosilicon. In the present invention, the specific type of the glycerin-modified silicone can achieve the effects of the present invention as long as the specific group and the content of the specific group are satisfied; the particular type of glycerin-modified silicone can be selected by one skilled in the art as desired under conditions that satisfy the above-mentioned specific groups and the content of the specific groups.
Wherein, preferably, the hydroxyl content in the polyorganosiloxane accounts for 5 to 8 weight percent of the total weight of the polyorganosiloxane.
Wherein preferably the hydrolysable group in the polyorganosiloxane is an ester group.
In the present invention, the specific type of polyorganosiloxane can achieve the effects of the present invention as long as the specific group and the content of the specific group are satisfied; the specific type of polyorganosiloxane can be selected by those skilled in the art as desired under the conditions that the above-mentioned specific groups and the content of the specific groups are satisfied.
In the present invention, the aqueous resin, the curing agent, the catalyst, and the slurry may be any conventional ones available in the art. Illustratively, the aqueous resin may include one or more of epoxy-modified acrylic resin, aqueous epoxy resin, aqueous polyester resin, aqueous alkyd resin, and aqueous polyurethane resin. Illustratively, the curing agent may include one or more of a phenol-formaldehyde resin, an isocyanate curing agent, a urea-formaldehyde resin, a melamine-formaldehyde resin, and an aniline-formaldehyde resin. Illustratively, the catalyst may include one or more of dinonylnaphthalene sulfonic acid, dinonylnaphthalene disulfonic acid, sulfamic acid, p-toluenesulfonic acid, dodecylbenzene sulfonic acid. Preferably, the aqueous resin is aqueous polyurethane resin, the curing agent is phenolic resin, and the catalyst is dinonylnaphthalenesulfonic acid.
In a second aspect, the present invention provides a method for preparing the anti-graffiti powder coating of the first aspect, comprising the following steps:
(1) Uniformly mixing methyl hydrogen silicone oil and hydroxyl silicone oil to obtain a first mixture;
(2) Mixing the glycerol modified organic silicon and the polysiloxane uniformly to obtain a second mixture;
(3) After the first mixture and the second mixture are subjected to third mixing, adding water-based resin for fourth mixing; then the curing agent, catalyst and slurry are added for a fifth mixing.
The preparation method disclosed by the invention is beneficial to promoting the synergistic effect and uniform distribution among the raw materials and improving the anti-graffiti performance of the coating.
Preferably, the conditions of the first blending, the second blending, the third mixing and the fourth mixing each independently include: stirring at 300-600r/min for 15-25min; the fifth mixing conditions include: the stirring speed is 100-200r/min, and the time is 20-40min.
The present invention will be described in detail below by way of examples. Wherein the water-based resin is water-based polyurethane resin, the curing agent is phenolic resin, and the catalyst is dinonyl naphthalenesulfonic acid.
Example 1
The anti-doodling powder coating comprises the following components in parts by weight: 40 parts of waterborne resin, 2 parts of curing agent and 0.5 part of catalyst, wherein the weight ratio of the additive to the waterborne resin is 0.2; the additive comprises: methyl hydrogen silicone oil a 1 part, hydroxyl silicone oil b, glycerol modified organic silicon c 1 part and polyorganosiloxane d, wherein a, b, c and d are parts by weight of corresponding components respectively and satisfy the following conditions: (0.4a + 0.1d)/(0.2c + 0.3b) =1; wherein the glycerol is modifiedThe organic silicon has long-chain alkyl, the proportion of univalent hydrocarbon groups in the molecule is 20 mass percent, and the content of glyceryl accounts for 4wt percent of the total weight of the glycerin modified organic silicon; and having only a glyceryl group as a hydrophilic group and no other hydrophilic group; the polyorganosiloxane has at least two hydroxyl groups bonded to silicon atoms per molecule, and the hydroxyl content is 6wt% based on the total weight of the polyorganosiloxane. The kinematic viscosity of the methyl hydrogen silicone oil is 100-120mm at 25 DEG C 2 And s. The dynamic viscosity of the hydroxyl silicone oil at 25 ℃ is 1200-1300 mPas.
The preparation method comprises the following steps:
(1) Uniformly mixing methyl hydrogen silicone oil and hydroxyl silicone oil to obtain a first mixture;
(2) Mixing the glycerol modified organic silicon and the polysiloxane uniformly to obtain a second mixture;
(3) After the first mixture and the second mixture are subjected to third mixing, adding water-based resin for fourth mixing; then the curing agent, catalyst and slurry are added for a fifth mixing. The conditions of the first blending, the second blending, the third blending and the fourth blending are as follows: stirring at 500r/min for 20min; the fifth mixing condition is as follows: the stirring speed is 150r/min, and the time is 30min.
Example 2
The procedure is as in example 1, except that a is 2 parts and c is 1 part.
Example 3
The procedure is as in example 1, except that a is 1 part and c is 1.5 parts.
Example 4
The procedure is as in example 1, except that the weight ratio of additive to aqueous resin is 0.5.
Example 5
The procedure is as in example 1 except that the glyceryl groups are present in an amount of 1% by weight based on the total weight of the glycerin-modified silicone.
Example 6
The procedure is as in example 1 except that the glyceryl groups are present in an amount of 10% by weight based on the total weight of the glycerin-modified silicone.
Example 7
The procedure is as in example 1 except that the glyceryl groups are present in an amount of 1% by weight based on the total weight of the glycerin-modified silicone.
Comparative example 1
The process is followed as in example 1 except that (0.4a + 0.1d)/(0.2c + 0.3b) is greater than 1,b is 3 parts.
Comparative example 2
The process is as in example 1 except that (0.4 a + 0.1d)/(0.2c + 0.3b) is less than 1,b is 1 part.
Comparative example 3
The procedure is as in example 1, except that no hydroxysilicone oil is added.
Comparative example 4
The procedure is as in example 1 except that no glycerol-modified silicone is added.
Test example
The coatings obtained in the above examples and comparative examples were subjected to the following performance tests:
1. evaluation of anti-graffiti Properties
The doodling resistance evaluation method refers to the building industry standard JG/T304-2011 of the people's republic of China, and evaluation is carried out according to the cleanable level of doodling.
The cleanable wash rating for graffiti is rated as follows in table 1:
TABLE 1
2. Evaluation of anti-sticking Properties
The method for evaluating the anti-sticking performance refers to the building industry standard JG/T304-2011 of the people's republic of China, and the evaluation is carried out through the anti-sticking performance (180-degree peel strength) and the repeated sticking resistance test.
3. Evaluation of other technical indices of the coating film
Other technical indexes of the coating film comprise the appearance, the surface drying time, the pencil hardness and the adhesive force of the coating film, and the coating film is prepared according to the method and the steps of the building industry standard JG/T304-2011 of the people's republic of China.
TABLE 2
As can be seen from the results in Table 1, the examples of the present invention have significantly better effects.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The anti-doodling powder coating comprises the following components in parts by weight: 30-60 parts of water-based resin, 2-5 parts of curing agent, 0.1-3 parts of catalyst, 0-6 parts of sizing agent and 8-20 parts of additive, and is characterized in that the additive comprises: methyl hydrogen silicone oil a, hydroxyl silicone oil b, glycerol modified organic silicon c and polyorganosiloxane d, wherein a, b, c and d are parts by weight of corresponding components respectively and satisfy the following conditions: (0.4a + 0.1d)/(0.2c + 0.3b) =1; wherein the glycerin-modified silicone has a long-chain alkyl group, has a monovalent hydrocarbon group in a proportion of 35 mass% or less in the molecule, has only a glycerin group as a hydrophilic group, and has no other hydrophilic group; the polyorganosiloxane has at least two hydroxyl groups or hydrolyzable groups bonded to a silicon atom per molecule.
2. The anti-graffiti powder coating according to claim 1, wherein the weight ratio of the additive to the aqueous resin is from 0.2 to 0.5.
3. The anti-graffiti powder coating according to claim 1, wherein the weight ratio of the additive to the aqueous resin is from 0.2 to 0.3.
4. Anti-graffiti powder coating according to claim 1, characterized in that the methylhydrogensilicone oil has a kinematic viscosity at 25 ℃ of 80 to 120mm 2 /s。
5. Anti-graffiti powder coating according to claim 1, characterized in that the hydroxyl silicone oil has a kinematic viscosity at 25 ℃ of 1200 to 1500 mPa-s.
6. The anti-graffiti powder coating according to claim 1, wherein the glycerol-modified silicone has a content of glycerol groups of 3 to 6wt% based on the total weight of the glycerol-modified silicone.
7. The graffiti-resistant powder coating according to claim 1, wherein the polyorganosiloxane has a hydroxyl group content of 5 to 8 wt.%, based on the total weight of the polyorganosiloxane.
8. The graffiti-resistant powder coating of claim 1, wherein the hydrolyzable groups in the polyorganosiloxane are ester groups.
9. Process for the preparation of an anti-graffiti powder coating according to any one of claims 1 to 8, characterized in that it comprises the following steps:
(1) Uniformly mixing methyl hydrogen silicone oil and hydroxyl silicone oil to obtain a first mixture;
(2) Mixing the glycerol modified organic silicon and the polysiloxane uniformly to obtain a second mixture;
(3) After the first mixture and the second mixture are subjected to third mixing, adding an aqueous resin for fourth mixing; then the curing agent, catalyst and slurry are added for a fifth mixing.
10. The method of claim 9, wherein the first homogenising, the second homogenising, the third mixing, and the fourth mixing conditions each independently comprise: stirring at 300-600r/min for 15-25min; the fifth mixing conditions include: the stirring speed is 100-200r/min, and the time is 20-40min.
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| CN202211125430.7A CN115595052A (en) | 2022-09-14 | 2022-09-14 | Anti-doodling powder coating and preparation method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477249A (en) * | 2010-11-26 | 2012-05-30 | 深圳市嘉达高科产业发展有限公司 | Aqueous anti-doodling and anti-affixing paint and its preparation method |
| CN111320922A (en) * | 2018-12-14 | 2020-06-23 | 天津中航百慕新材料技术有限公司 | High weather-proof anti-sticking coating and preparation method thereof |
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- 2022-09-14 CN CN202211125430.7A patent/CN115595052A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477249A (en) * | 2010-11-26 | 2012-05-30 | 深圳市嘉达高科产业发展有限公司 | Aqueous anti-doodling and anti-affixing paint and its preparation method |
| CN111320922A (en) * | 2018-12-14 | 2020-06-23 | 天津中航百慕新材料技术有限公司 | High weather-proof anti-sticking coating and preparation method thereof |
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