CN108219618B - A kind of preparation method of high resist sagging type acrylic coating - Google Patents

A kind of preparation method of high resist sagging type acrylic coating Download PDF

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CN108219618B
CN108219618B CN201810102720.7A CN201810102720A CN108219618B CN 108219618 B CN108219618 B CN 108219618B CN 201810102720 A CN201810102720 A CN 201810102720A CN 108219618 B CN108219618 B CN 108219618B
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acrylic coating
coating
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CN108219618A (en
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江兵
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Shanghai Hongye Coating Technology Development Co ltd
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
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    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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    • C09D133/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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Abstract

The invention discloses a kind of preparation methods of high resist sagging type acrylic coating, are related to technical field of coatings, comprising the following steps: (1) aqueous acrylic emulsion synthesizes, the preparation of (2) auxiliary material, the preparation of (3) acrylic coating.The present invention makes coating using water as diluent by the preparation of aqueous acrylic emulsion, avoids the problem that using organic solvent as volatile pollution environment existing for diluent;Made acrylic coating is on the basis of mechanical property satisfies the use demand while having excellent resist sagging performance, it can effectively avoid Conventional acrylic coating after spray coating since gravity generates flowing accumulation downwards to the appearance current mark of " shedding tears " occur, and then improve the presentation quality of paint film.

Description

A kind of preparation method of high resist sagging type acrylic coating
Technical field:
The present invention relates to technical field of coatings, and in particular to a kind of preparation method of high resist sagging type acrylic coating.
Background technique:
In paint field, acrylic resin has many excellent performances, and with the development of technology, to acrylic acid Higher requirements are also raised for the service performance of coating, especially the thixotropic property of coating.Good thixotropic property makes paint film i.e. Make in the case where thicker, sagging phenomenon will not occur.
Sagging phenomenon is a kind of defect frequently encountered in coating application.When coating passes through spraying or the coating of other techniques When on to the surface being disposed vertically, due to gravity, thicker coating wet film or the excessively dilute coating wet film of viscosity can be to Lower generation flowing accumulation, and there is the appearance current mark of " shedding tears ", seriously affect the appearance of paint film.
Currently, the common method for improving paint thixotropy includes: that thixotropic agent is added in coating by (1).Thixotropic agent due to The reasons such as performance, side effect, additive amount is limited, very limited for the change of Rheological Property of Coating, so that made coating is anti- Sagging performance is poor.(2) rheology control agent is synthesized in the presence of matrix resin, is finally mixed to form thixotroping resin.Rheology It is physical mixed between controlling agent and matrix resin, the dispersion in resin needs to realize by physical agitation, is unable to get More stable uniform product, and thixotropy is still poor, causes resist sagging performance poor.
Summary of the invention:
Technical problem to be solved by the present invention lies in one kind is provided, operation is simple, the feature of environmental protection is strong and product usability The preparation method of high resist sagging type acrylic coating that can be excellent.
The following technical solution is employed for the technical problems to be solved by the invention to realize:
A kind of preparation method of high resist sagging type acrylic coating, comprising the following steps:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator, stirring is completely dissolved initiator, adds Chain-transferring agent and the monomer mixed, are heated to reflux state insulation reaction, after reaction drop gained mixture under stirring Then temperature is added in triethylamine and stirs to 30-40 DEG C, deionized water is added after the completion of to be neutralized and stirs aquation, and distills back Acetone solvent is received to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by nanometer calcium carbonate, ultra-fine polytetrafluorethylepowder powder, Lauryl Alcohol ester, anti-sagging agent, polymerization Aluminum sulfate, the mixing of hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
The initiator is selected from one of azodiisobutyronitrile, azobisisoheptonitrile.
The initiator amount accounts for the 4.5-5% of monomer gross mass.
The monomer is made of methyl methacrylate, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate.
The methyl methacrylate, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate molar ratio be 1:1:1:0.5- 1。
The chain-transferring agent selects beta -mercaptoethanol.
The dosage of the chain-transferring agent is that every synthesis 1mol acrylate polymer needs 1mol chain-transferring agent.
The nanometer calcium carbonate, ultra-fine polytetrafluorethylepowder powder, Lauryl Alcohol ester, anti-sagging agent, polyaluminium sulfate, six hydroxyls Methyl melamine pregnancy ether and the ratio of monomer gross mass are 10-15:5-10:3-8:3-8:1-5:1-5:50-80.
The anti-sagging agent is selected from one of rilanit special, fumed silica.
The anti-sagging agent is made of the raw material of following parts by weight: 20-40 parts of rilanit special, polyglutamic acid 10- 15 parts, 5-10 parts of 4A molecular screen primary powder, 100-200 parts of dehydrated alcohol.
The preparation method of the anti-sagging agent includes the following steps:
(1) esterification modification: polyglutamic acid being dissolved in 20-25 DEG C of deionized water, polyglutamic acid saturated solution be made, And 5% dilute sulfuric acid is added dropwise and adjusts solution ph to 4.5-5, rilanit special is added, it is anti-to be heated to reflux state insulated and stirred It answers, lotion is made in the reduced pressure of gained mixture after esterification, made lotion is sent into after cooled to room temperature In freeze drier, micro mist is made through micronizer to get modified hydrogenated castor oil in dry obtained solid;
(2) carrier helps dispersion: the modified hydrogenated castor oil of made polyglutamic acid being added to absolute ethanol, and is heated to 50-55 DEG C of insulated and stirred 5-10min, adds 4A molecular screen primary powder, continues to be heated to reflux state insulated and stirred 0.5-1h, institute It obtains mixture and recycling ethyl alcohol is concentrated under reduced pressure, condensate residue, which is sent into 55-60 DEG C of baking oven, to be dried to constant weight, and obtained solid warp is super Micro mist is made to get anti-sagging agent in atomizer.
The polyglutamic acid selects water process grade polyglutamic acid.
By polyglutamic acid to the esterification modification of rilanit special, easy shape when solving rilanit special applied to coating The problem of at gel, improves dispersibility of the rilanit special in coating;And helping peptizaiton and further promote by carrier It is dispersed in rilanit special in coating, the comixing compatibility of anti-sagging agent and coating raw material is improved, to make resist sagging Agent gives full play to its resist sagging performance.
The 4A molecular screen primary powder passes through modification, method of modifying are as follows: three hydroxyl first are added into 4A molecular screen primary powder Base propane triglycidyl ether and ferrocene are heated to 120-125 DEG C of insulated and stirred 0.5-1h, add hydrolyzed polymaleic anhydride Acid anhydride continues insulated and stirred 0.5-1h, gained mixture cooled to room temperature, most afterwards through micronizer at 120-125 DEG C Micro mist is made to get modified 4A molecular sieve.
The 4A molecular screen primary powder, trihydroxymethylpropanyltri diglycidyl ether, ferrocene, hydrolysis of polymaleic anhydride quality Than for 15-25:5-10:0.05-0.5:1-5.
4A molecular screen primary powder significantly increases its comixing compatibility with coating raw material after above-mentioned modification, to promote It is dispersed in rilanit special in coating, to give full play to its sag resistance energy.
Thixotroping value: referring at room temperature, the ratio of the viscosity number under viscosity number and 50rpm under revolving speed 5rpm.
The beneficial effects of the present invention are: the preparation method of acrylic coating of the present invention has, operation is simple, ring The strong feature of guarantor property, is made coating using water as diluent, avoids being made using organic solvent by the preparation of aqueous acrylic emulsion For existing for diluent the problem of volatile pollution environment;Made acrylic coating is on the basis that mechanical property satisfies the use demand Above while there is excellent resist sagging performance, can effectively avoid Conventional acrylic coating after spray coating since gravity produces downwards Raw flowing accumulation improves the presentation quality of paint film to the appearance current mark of " shedding tears " occur.
Specific embodiment:
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below Specific embodiment is closed, the present invention is further explained.
Embodiment 1
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 5kg Anti-sagging agent rilanit special, 3kg polyaluminium sulfate, the mixing of 2kg hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
Embodiment 2
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 5kg Anti-sagging agent fumed silica, 3kg polyaluminium sulfate, the mixing of 2kg hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
Embodiment 3
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 5kg Anti-sagging agent, 3kg polyaluminium sulfate, the mixing of 2kg hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
The preparation of anti-sagging agent:
(1) esterification modification: 15g water process grade polyglutamic acid is dissolved in 20-25 DEG C of deionized water, more polyglutamics is made Sour saturated solution, and 5% dilute sulfuric acid is added dropwise and adjusts solution ph to 4.5-5,40g rilanit special is added, is heated to flowing back State insulated and stirred is reacted, and lotion is made in the reduced pressure of gained mixture after esterification, made lotion is through naturally cold But in feeding freeze drier, micro mist is made through micronizer to get modified hydrogenated castor-oil plant in dry obtained solid after room temperature Oil;
(2) carrier helps dispersion: the modified hydrogenated castor oil of made polyglutamic acid being added in 200g dehydrated alcohol, and is heated To 50-55 DEG C of insulated and stirred 10min, 8g 4A molecular screen primary powder is added, continues to be heated to reflux state insulated and stirred 1h, institute It obtains mixture and recycling ethyl alcohol is concentrated under reduced pressure, condensate residue, which is sent into 55-60 DEG C of baking oven, to be dried to constant weight, and obtained solid warp is super Micro mist is made to get anti-sagging agent in atomizer.
Embodiment 4
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 5kg Anti-sagging agent, 3kg polyaluminium sulfate, the mixing of 2kg hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
The preparation of anti-sagging agent:
(1) esterification modification: 15g water process grade polyglutamic acid is dissolved in 20-25 DEG C of deionized water, more polyglutamics is made Sour saturated solution, and 5% dilute sulfuric acid is added dropwise and adjusts solution ph to 4.5-5,40g rilanit special is added, is heated to flowing back State insulated and stirred is reacted, and lotion is made in the reduced pressure of gained mixture after esterification, made lotion is through naturally cold But in feeding freeze drier, micro mist is made through micronizer to get modified hydrogenated castor-oil plant in dry obtained solid after room temperature Oil;
(2) carrier helps dispersion: the modified hydrogenated castor oil of made polyglutamic acid being added in 200g dehydrated alcohol, and is heated To 50-55 DEG C of insulated and stirred 10min, 8g 4A molecular screen primary powder is added, continues to be heated to reflux state insulated and stirred 1h, institute It obtains mixture and recycling ethyl alcohol is concentrated under reduced pressure, condensate residue, which is sent into 55-60 DEG C of baking oven, to be dried to constant weight, and obtained solid warp is super Micro mist is made to get anti-sagging agent in atomizer.
The modification of 4A molecular screen primary powder: 8g trihydroxymethylpropanyltri diglycidyl ether is added into 25g 4A molecular screen primary powder With 0.25g ferrocene, it is heated to 120-125 DEG C of insulated and stirred 1h, adds 3g hydrolysis of polymaleic anhydride, is continued in 120-125 Most micro mist is made to get modified 4A through micronizer afterwards in insulated and stirred 0.5h at DEG C, gained mixture cooled to room temperature Molecular sieve.
Reference examples 1
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 5kg Anti-sagging agent rilanit special, 3kg polyaluminium sulfate, the mixing of 2kg hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
Reference examples 2
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 5kg Anti-sagging agent rilanit special, the mixing of 3kg polyaluminium sulfate are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
Reference examples 3
The preparation of coating:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator azodiisobutyronitrile, stirring keeps initiator complete Dissolution, adds the monomer that chain-transferring agent beta -mercaptoethanol and 80kg are mixed, reflux state insulation reaction is heated under stirring, Gained mixture is cooled to 30-40 DEG C after reaction, is then added in triethylamine and stirs, is added and goes after the completion of to be neutralized Ionized water stirs aquation, and is distilled to recover acetone solvent to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by 15kg nanometer calcium carbonate, the ultra-fine polytetrafluorethylepowder powder of 8kg, 5kg Lauryl Alcohol ester, 3kg Polyaluminium sulfate, the mixing of 2kg hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, contains the quality of gained mixture Water reaches 30-40%, stirs evenly, and is transferred to sealing and standing 12h in 5-10 DEG C of environment, and spontaneous recovery to room temperature is sufficiently stirred It mixes to get acrylic coating.
Wherein, initiator amount accounts for the 5% of monomer gross mass, and monomer is 1:1:1:0.7 methyl methacrylate by molar ratio Ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition, the dosage of chain-transferring agent are every synthesis 1mol acrylic ester polymerization Object needs 1mol chain-transferring agent.
Embodiment 5
Be utilized respectively embodiment 1-4, reference examples 1-3 prepares acrylic coating, and test the sagging of made acrylic coating Performance, test result are as shown in table 1.
Test method: one piece of 40mm × 15 × (0.1-0.3) mm tinplate template is divided into 5 with adhesive tape from top to bottom Then region is sprayed, spray 1 time, 2 times, 3 times, 4 times and 5 times respectively from top to bottom, i.e. film thickness gradually becomes from top to bottom It is thick.Adhesive tape is torn, vertical state is kept to place surface drying, then enters after baking oven high-temperature baking certain time takes out and observes from which Region starts slight sagging phenomenon occur, and records the film thickness of this region lower edge, this numerical value is defined as the sagging pole of wet film Limit film thickness.
The sagging the performance test results of the acrylic coating of the present invention of table 1
As shown in Table 1, self-control anti-sagging agent has better than conventional anti-sagging agent rilanit special and fumed silica Resist sagging performance makes by oneself and helps the modification of dispersible carrier 4A molecular screen primary powder to can be further improved resist sagging used in anti-sagging agent Energy;Coating resist sagging performance decline without 5-10 DEG C of sub-cooled processing, is not added with hexamethylolmelamine pregnancy ether Coating resist sagging performance can also decline.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (8)

1. a kind of preparation method of high resist sagging type acrylic coating, which comprises the following steps:
(1) aqueous acrylic emulsion synthesizes: acetone being added into initiator, stirring is completely dissolved initiator, adds chain and turns The monomer for moving agent and mixing, is heated to reflux state insulation reaction, is after reaction cooled to gained mixture under stirring It 30-40 DEG C, is then added in triethylamine and stirs, deionized water is added after the completion of to be neutralized and stirs aquation, and is distilled to recover third Ketone solvent is to get aqueous acrylic emulsion;
(2) prepared by auxiliary material: by nanometer calcium carbonate, ultra-fine polytetrafluorethylepowder powder, Lauryl Alcohol ester, anti-sagging agent, polyaluminum sulfate Aluminium, the mixing of hexamethylolmelamine pregnancy ether are to get auxiliary material;
(3) prepared by acrylic coating: aqueous acrylic emulsion and auxiliary material being added into water, makes the mass water content of gained mixture Reach 30-40%, stir evenly, and be transferred to sealing and standing 12h in 5-10 DEG C of environment, spontaneous recovery to room temperature is sufficiently stirred, i.e., Obtain acrylic coating;
The anti-sagging agent is made of the raw material of following parts by weight: 20-40 parts of rilanit special, 10-15 parts of polyglutamic acid, 5-10 parts of 4A molecular screen primary powder, 100-200 parts of dehydrated alcohol, preparation method includes the following steps:
(1) esterification modification: polyglutamic acid is dissolved in 20-25 DEG C of deionized water, polyglutamic acid saturated solution is made, and dripped Add 5% dilute sulfuric acid to adjust solution ph to 4.5-5, adds rilanit special, be heated to the reaction of reflux state insulated and stirred, ester Change and lotion is made in the reduced pressure of gained mixture after reaction, it is dry that made lotion is sent into freezing after cooled to room temperature In dry machine, micro mist is made through micronizer to get modified hydrogenated castor oil in dry obtained solid;
(2) carrier helps dispersion: the modified hydrogenated castor oil of made polyglutamic acid being added to absolute ethanol, and is heated to 50-55 DEG C insulated and stirred 5-10min, adds 4A molecular screen primary powder, continues to be heated to reflux state insulated and stirred 0.5-1h, gained is mixed It closes object and recycling ethyl alcohol is concentrated under reduced pressure, condensate residue is sent into 55-60 DEG C of baking oven and is dried to constant weight, and obtained solid is through Ultramicro-powder Micro mist is made to get anti-sagging agent in broken machine.
2. the preparation method of high resist sagging type acrylic coating according to claim 1, it is characterised in that: the initiator Selected from one of azodiisobutyronitrile, azobisisoheptonitrile.
3. the preparation method of high resist sagging type acrylic coating according to claim 1, it is characterised in that: the initiator Dosage accounts for the 4.5-5% of monomer gross mass.
4. the preparation method of high resist sagging type acrylic coating according to claim 1, it is characterised in that: the monomer by Methyl methacrylate, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate composition.
5. the preparation method of high resist sagging type acrylic coating according to claim 4, it is characterised in that: the methyl-prop E pioic acid methyl ester, butyl acrylate, acrylic acid, hydroxy-ethyl acrylate molar ratio be 1:1:1:0.5-1.
6. the preparation method of high resist sagging type acrylic coating according to claim 1, it is characterised in that: the chain tra nsfer Beta -mercaptoethanol is selected in agent.
7. the preparation method of high resist sagging type acrylic coating according to claim 1, it is characterised in that: the chain tra nsfer The dosage of agent is that every synthesis 1mol acrylate polymer needs 1mol chain-transferring agent.
8. the preparation method of high resist sagging type acrylic coating according to claim 1, it is characterised in that: the nano-sized carbon Sour calcium, ultra-fine polytetrafluorethylepowder powder, Lauryl Alcohol ester, anti-sagging agent, polyaluminium sulfate, hexamethylolmelamine pregnancy ether Ratio with monomer gross mass is 10-15:5-10:3-8:3-8:1-5:1-5:50-80.
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