CN112724338B - Castor oil modified emulsion for improving directionality of silver powder of water-based silver powder coating and preparation method of castor oil modified emulsion - Google Patents
Castor oil modified emulsion for improving directionality of silver powder of water-based silver powder coating and preparation method of castor oil modified emulsion Download PDFInfo
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- CN112724338B CN112724338B CN202011549198.0A CN202011549198A CN112724338B CN 112724338 B CN112724338 B CN 112724338B CN 202011549198 A CN202011549198 A CN 202011549198A CN 112724338 B CN112724338 B CN 112724338B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
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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
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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Abstract
The invention relates to the field of water-based paint, in particular to castor oil modified emulsion for improving the directionality of silver powder of water-based silver powder paint and a preparation method thereof. The castor oil modified emulsion comprises, by weight, 7-20 parts of castor oil modified emulsifier, 27-63 parts of vinyl monomer, 131-158 parts of deionized water, 0.3-0.9 part of initiator, 0.2-0.4 part of pH buffer and 0.5-13 parts of neutralizer. According to the castor oil modified emulsion for improving the directionality of the silver powder of the water-based silver powder coating and the preparation method thereof, provided by the invention, the castor oil which is an environment-friendly resource is used as a starting raw material, renewable resources are effectively utilized, an effective way for solving the energy crisis is provided, the silver powder orientation effect of the water-based silver powder coating is effectively improved, the use of expensive silver powder arrangement auxiliaries is avoided, and the production cost is saved.
Description
Technical Field
The invention relates to the field of water-based paint, in particular to castor oil modified emulsion for improving the directionality of silver powder of water-based silver powder paint and a preparation method thereof.
Background
The directional arrangement of the water-based silver powder is a big problem in the global industry, the silver powder flashing paint has a special decorative effect, is more and more widely applied, plays a role in the color of the automobile paint, and can be used for machine tools, television housings, VCD housings, mobile phone shells and the like, even wall decoration. The silver powder has a problem of arrangement in the coating due to its flake structure, and if the arrangement of the silver powder is not well controlled, the color cannot meet the requirements, and the silver powder is not easy to construct and is easy to flower, and finally the decorative effect is influenced. Therefore, how to control the arrangement of the silver powder and avoid the floating is a problem which needs to be solved by each formula designer and constructor, and the traditional silver powder orientation auxiliary agent is expensive and limits the use of the formula designer, so that the exploration of green and novel silver powder orientation coatings has great significance.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides the castor oil modified emulsion for improving the silver powder directionality of the water-based silver powder coating, when the castor oil modified emulsion is used for the water-based silver powder coating, the triglyceride structure of castor oil obviously inhibits the shrinkage of a coating film in the coating film curing process, the castor oil modified emulsion plays a good role in directional arrangement of silver powder, the problems of easy blooming and blushing of the water-based silver powder coating caused by poor orientation are solved, meanwhile, the emulsion brings the silver powder directional effect, the silver powder arrangement auxiliary agent with high cost is not required to be used, and the castor oil modified emulsion plays a good role in cost control.
In order to achieve the purpose, the castor oil modified emulsion for improving the directionality of the silver powder of the water-based silver powder coating comprises 7 to 20 parts of castor oil modified emulsifying agent, 27 to 63 parts of vinyl monomer, 131-158 parts of deionized water, 0.3 to 0.9 part of initiator, 0.2 to 0.4 part of pH buffering agent and 0.5 to 13 parts of neutralizing agent in percentage by weight.
Further, the castor oil modified emulsifier comprises 93-111 parts by weight of castor oil, 44-53 parts by weight of mercaptosuccinic acid, 50-100 parts by weight of dichloromethane and 0.5-1 part by weight of photoinitiator.
Further, the vinyl monomer includes 14 to 32 parts of a vinyl monomer or a vinyl aromatic compound not including a carboxyl group or a hydroxyl group, 12 to 21 parts of a vinyl monomer including a hydroxyl group, and 1 to 10 parts of a vinyl monomer including a carboxyl group.
In another aspect of the present invention, a method for preparing the above castor oil modified emulsion is provided, which comprises the following steps:
s1, carrying out emulsion polymerization on a castor oil modified emulsifier and a vinyl monomer
S2, carrying out sulfydryl-alkene click reaction, and removing dichloromethane in vacuum;
and S3, neutralizing by using a neutralizing agent to obtain the castor oil modified emulsion.
Further, the step of emulsion polymerization in the step S1 includes:
s11, placing a vinyl monomer or a vinyl aromatic compound which does not contain carboxyl or hydroxyl, a vinyl monomer containing carboxyl, a castor oil modified emulsifier, part of deionized water and part of an initiator into a reaction kettle, rotating at 600r/min, and dispersing for at least 20min to obtain a pre-emulsion.
S12, adding the rest deionized water, the initiator and the pH buffering agent into a reaction kettle, stirring at 200r/min, heating to 80-85 ℃, starting to dropwise add the pre-emulsion, keeping the temperature for 1h after 4h of dropwise addition is finished, cooling to below 50 ℃, adding a neutralizing agent, and adjusting the pH to 7-8; filtering and discharging to obtain the castor oil modified emulsion.
The preparation method of the castor oil modified emulsifier comprises the following steps: after castor oil is subjected to vacuum dehydration, adding castor oil, dichloromethane, mercaptosuccinic acid and a photoinitiator into a four-neck flask, heating to 50 ℃, irradiating for 1.5h by using an ultraviolet lamp, washing out excessive mercaptosuccinic acid by using deionized water, removing dichloromethane in vacuum, and adjusting the ph to 7-8 by using a neutralizing agent to obtain the castor oil modified emulsifier.
Further, the vinyl monomer or vinyl aromatic compound not containing carboxyl or hydroxyl is a mixture of three or more of styrene, methyl methacrylate, butyl acrylate, isooctyl acrylate, methyl acrylate and ethyl acrylate.
Further, the vinyl monomer containing hydroxyl is one or a mixture of more than one of hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate and hydroxypropyl acrylate.
Further, the vinyl monomer containing carboxyl is one or a mixture of more than one of acrylic acid and methacrylic acid.
Further, the initiator is ammonium persulfate; the pH buffering agent is sodium bicarbonate; the neutralizer is ammonia water.
Advantageous effects of the invention
The castor oil modified emulsion for improving the directionality of the silver powder of the water-based silver powder coating and the preparation method thereof have the advantages that:
1. the castor oil modified emulsion for improving the directionality of the silver powder of the water-based silver powder coating adopts environment-friendly castor oil as a starting material, effectively utilizes renewable resources and provides an effective way for solving the energy crisis;
2. the castor oil modified emulsion for improving the directionality of the silver powder of the water-based silver powder coating effectively improves the silver powder directing effect of the water-based silver powder coating, avoids using expensive silver powder arrangement auxiliary agents and saves the cost;
3. the invention has simple process, and the prepared emulsion has good storage stability and good compatibility with the coating, and is suitable for industrial production.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
A. The formula of the castor oil modified emulsifier comprises:
after castor oil is subjected to vacuum dehydration, adding castor oil, dichloromethane, mercaptosuccinic acid and a photoinitiator UV1173 into a four-neck flask according to the using amount, heating to 50 ℃, irradiating for 1.5h by using an ultraviolet lamp, washing out excessive mercaptosuccinic acid by using deionized water, removing dichloromethane in vacuum, and adjusting the pH to 7-8 by using a neutralizing agent to obtain the castor oil modified emulsifier.
B. The formula of the castor oil modified emulsion comprises:
the formula of the pre-emulsion comprises:
the vinyl monomer, the deionized water, the castor oil modified emulsifier and the initiator are placed in a reaction kettle according to the formula amount, the rotating speed is 600r/min, and the pre-emulsion is prepared after the dispersion is carried out for 20 min.
Weighing deionized water: 88 parts of ammonium persulfate: 0.3 part, sodium bicarbonate: 0.3 part of the mixture is put in a reaction kettle, stirred at 200r/min, heated to 80 ℃, pre-emulsion is started, dropwise adding is completed within 4 hours, heat preservation is carried out for 1 hour, the temperature is reduced to below 50 ℃, and industrial ammonia water is added: 6 parts, adjusting the pH to 7-8; filtering and discharging to obtain the castor oil modified emulsion with improved directionality of the silver powder of the water-based silver powder coating.
Example 2
A. The formula of the castor oil modified emulsifier comprises:
after castor oil is subjected to vacuum dehydration, adding castor oil, dichloromethane, mercaptosuccinic acid and a photoinitiator UV1173 into a four-neck flask according to the using amount, heating to 50 ℃, irradiating for 1.5h by using an ultraviolet lamp, washing out excessive mercaptosuccinic acid by using deionized water, removing dichloromethane in vacuum, and adjusting the pH to 7-8 by using a neutralizing agent to obtain the castor oil modified emulsifier.
B. The formula of the castor oil modified emulsion comprises:
the formula of the pre-emulsion comprises:
the vinyl monomer, the deionized water, the castor oil modified emulsifier and the initiator are placed in a reaction kettle according to the formula amount, the rotating speed is 600r/min, and the pre-emulsion is prepared after the dispersion is carried out for 20 min.
Weighing deionized water: 88 parts of ammonium persulfate: 0.3 part, sodium bicarbonate: 0.3 part of the mixture is put in a reaction kettle, stirred at 200r/min, heated to 80 ℃, pre-emulsion is started, dropwise adding is completed within 4 hours, heat preservation is carried out for 1 hour, the temperature is reduced to below 50 ℃, and industrial ammonia water is added: 6 parts, and adjusting the pH to 7-8; filtering and discharging to obtain the castor oil modified emulsion with improved directionality of the silver powder of the water-based silver powder coating.
Example 3 (blank experiment)
B. The formula of the blank emulsion comprises:
the formula of the pre-emulsion comprises:
the vinyl monomer, deionized water, the emulsifier OP-10 and the initiator are placed in a reaction kettle according to the formula amount, the rotating speed is 600r/min, and the pre-emulsion is prepared after the dispersion is carried out for 20 min.
Weighing deionized water: 88 parts of ammonium persulfate: 0.3 part, sodium bicarbonate: 0.3 part of the mixture is put in a reaction kettle, stirred at 200r/min, heated to 80 ℃, pre-emulsion is started, dropwise adding is completed within 4 hours, heat preservation is carried out for 1 hour, the temperature is reduced to below 50 ℃, and industrial ammonia water is added: 6 parts, and adjusting the pH to 7-8; filtering and discharging to obtain blank emulsion.
Example 4
The emulsions prepared in examples 1-3 above were formulated into waterborne silver powder baking paints according to the following formulation:
adding the materials into a 1L paint mixing tank according to the formula amount, dispersing for 30 minutes at a high speed, adding a thickening agent to adjust the viscosity, and obtaining the water-based silver powder baking paint.
The performance tests of the prepared 3 waterborne silver powder baking paints are shown in the table one:
watch 1
The silver powder orientation effect test of the prepared 3 kinds of water-based silver powder baking paints is shown in the table two:
| directional effect of silver powder | Example 1 | Example 2 | Example 3 |
| Visual particle size | Fineness of fineness | Fineness of fineness | Roughness of |
| Front view surface | Gao Guang | Gao Guang | Plain light |
| Oblique viewing surface | Dark | Darkness | White with flashing dots |
| Plane view surface | Darkness | Darkness | White with flickering dots |
| Degree of scintillation | Weak (weak) | Weak (weak) | White with flickering dots |
| Surface state | Smoothing | Smoothing | Roughness of |
| Hiding power | Good effect | Good effect | Difference (D) |
Watch two
As can be seen from the salt spray results of the baking finishes of examples 1 to 3, the castor oil modified emulsion has a good effect of inhibiting the edge corrosion of the coating film, and as can be seen from the comparison of the orientation effect of the silver powder of examples 1 to 3, the triglyceride in the castor oil has a good effect of the orientation of the silver powder.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be within the technical scope of the present invention, and the technical solutions and novel concepts according to the present invention should be covered by the scope of the present invention.
Claims (8)
1. A castor oil modified emulsion for improving the directionality of silver powder of a water-based silver powder coating is characterized by comprising 7-20 parts of castor oil modified emulsifier, 27-63 parts of vinyl monomer, 131-158 parts of deionized water, 0.3-0.9 part of initiator, 0.2-0.4 part of pH buffer and 0.5-13 parts of neutralizer according to weight ratio, wherein the vinyl monomer comprises 14-32 parts of vinyl monomer without carboxyl or hydroxyl, 12-21 parts of vinyl monomer containing hydroxyl and 1-10 parts of vinyl monomer containing carboxyl;
the preparation method further comprises the preparation steps of the castor oil modified emulsifier, and specifically comprises the following steps:
after castor oil is subjected to vacuum dehydration, adding castor oil, dichloromethane, mercaptosuccinic acid and a photoinitiator into a four-neck flask, heating to 50 ℃, irradiating for 1.5h by using an ultraviolet lamp, washing out excessive mercaptosuccinic acid by using deionized water, removing dichloromethane in vacuum, and adjusting the ph to 7-8 by using a neutralizing agent to obtain the castor oil modified emulsifier.
2. The castor oil modified emulsion for improving the orientation of silver powder in an aqueous silver powder coating of claim 1, wherein the castor oil modified emulsifier comprises 93 to 111 parts by weight of castor oil, 44 to 53 parts by weight of mercaptosuccinic acid, 50 to 100 parts by weight of dichloromethane, and 0.5 to 1 part by weight of photoinitiator.
3. A preparation method of the castor oil modified emulsion for improving the orientation of the silver powder of the water-based silver powder coating as claimed in any one of claims 1 to 2, wherein the method comprises emulsion polymerization of the castor oil modified emulsifier and a vinyl monomer.
4. The method of preparing a castor oil-modified emulsion according to claim 3, wherein the step of emulsion polymerizing comprises:
(1) placing a vinyl monomer without carboxyl or hydroxyl, a vinyl monomer containing carboxyl, a castor oil modified emulsifier, part of deionized water and part of initiator in a reaction kettle, rotating at 600r/min, and dispersing for at least 20min to obtain a pre-emulsion;
(2) adding the rest deionized water, the initiator and the pH buffering agent into a reaction kettle, stirring at 200r/min, heating to 80-85 ℃, starting to dropwise add the pre-emulsion, keeping the temperature for 1h after 4h of dropwise addition is finished, cooling to below 50 ℃, adding a neutralizing agent, and adjusting the pH to 7-8; filtering and discharging to obtain the castor oil modified emulsion.
5. The method of claim 4, wherein the vinyl monomer that does not contain a carboxyl or hydroxyl group is a mixture of three or more of styrene, methyl methacrylate, butyl acrylate, isooctyl acrylate, methyl acrylate, and ethyl acrylate.
6. The method of claim 4, wherein the hydroxyl-containing vinyl monomer is one or more of hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, and hydroxypropyl acrylate.
7. The method of claim 4, wherein the vinyl monomer containing carboxyl groups is one or more of acrylic acid, methacrylic acid, and mixtures thereof.
8. The method of claim 4, wherein the initiator is ammonium persulfate; the pH buffering agent is sodium bicarbonate; the neutralizer is ammonia water.
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| JP2006052294A (en) * | 2004-08-11 | 2006-02-23 | Kansai Paint Co Ltd | Method for producing aqueous resin dispersion |
| CN101080429A (en) * | 2004-12-15 | 2007-11-28 | 阿克佐诺贝尔国际涂料股份有限公司 | Water borne coating composition containing thiol functional compounds |
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