CN111995940B - Super-matte PU odor-free clear finishing coat and preparation method thereof - Google Patents
Super-matte PU odor-free clear finishing coat and preparation method thereof Download PDFInfo
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- CN111995940B CN111995940B CN202010978864.6A CN202010978864A CN111995940B CN 111995940 B CN111995940 B CN 111995940B CN 202010978864 A CN202010978864 A CN 202010978864A CN 111995940 B CN111995940 B CN 111995940B
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
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- 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
- C09D7/20—Diluents or solvents
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- 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
- C09D7/42—Gloss-reducing agents
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- 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
- C09D7/47—Levelling agents
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/65—Additives macromolecular
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a super-matte PU odor-free clear finish and a preparation method thereof, belonging to the technical field of coatings, wherein the super-matte PU odor-free clear finish comprises a component A, a component B and a diluent; the component A comprises synthetic fatty acid modified odor-free alkyd resin, 1/16 nitrocellulose resin, ether ester solvent, matting powder, glass powder and other auxiliary agents; the component B comprises n-butyl acetate, a dehydrating agent, an addition product polyisocyanate curing agent and a trimer curing agent; the preparation method adopts the step-by-step addition of raw materials for stirring. The super-matte PU odorless clear finish paint can obviously reduce the addition amount of matting powder and improve the matting effect, the glossiness of a prepared paint film can achieve the super-matte effect, the problems that the existing matte clear finish paint is poor in matte effect and cannot reach the glossiness of 3 degrees or below 3 degrees are solved, the preparation method is better in compatibility among groups and better in dispersion effect, and the matte effect and other properties of the paint film prepared from the paint are improved to a certain extent.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a super-matte PU odor-free clear finishing coat and a preparation method thereof.
Background
Along with the continuous improvement of the cultural life of people and the gradual enhancement of the environmental awareness, the taste and the requirements of people on living environment and home furnishing are also gradually improved. The coating effect of the surfaces of furniture with various colors is a standard for people to select furniture and is a criterion for judging the coating effect of paint on the surfaces of the furniture. In recent years, the coating of furniture with pure taste and super-matte gloss is indispensable in furniture production, and is more and more favored by consumers. However, the problem of achieving a coating effect with an ultra-matte gloss on furniture is that of each coating company and furniture factory. At present, the common PU matte top-coat paint on the market generally has the defects that the glossiness of a paint film is not sufficient, the glossiness of the paint film is less than or equal to 3 degrees after coating and film forming, and simultaneously, the phenomenon of residual smell exists. Particularly, for solid wood furniture products, the coating effect is obviously influenced due to insufficient gloss, residual odor and the like, and the purchasing of consumers is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the technical problems to be solved by the invention are as follows: how to solve the problems that the glossiness of the bi-component PU matte clear finish is higher (more than or equal to 5 degrees) after being coated and formed into a film and the glossiness less than or equal to 3 degrees is difficult to realize
In order to solve the technical problems, the invention adopts the technical scheme that: the super-matte PU odorless clear finishing coat comprises a component A, a component B and a diluent;
the component A comprises 65-76.5% of synthetic fatty acid modified odor-removing alkyd resin, 3-5% of 1/16 nitrocellulose resin, 5-8% of ether ester solvent, 0.8-2% of dispersing agent, 0.2-0.5% of defoaming agent, 4.5-6.5% of matting powder, 3-4.5% of glass powder, 0.5-1% of wax powder, 0.3-0.5% of acrylic acid leveling agent, 0.2-0.3% of organic silicon leveling agent and 5-6.7% of ester solvent according to weight percentage;
the component B comprises 14.5 to 34.9 weight percent of n-butyl acetate, 0.1 to 0.5 weight percent of dehydrating agent, 35 to 45 weight percent of adduct polyisocyanate and 30 to 40 weight percent of trimer curing agent;
the diluent comprises, by weight, 35-50% of propylene glycol methyl ether acetate, 30-50% of n-butyl acetate and 15-20% of ethyl acetate.
The other technical scheme adopted by the invention is as follows: the preparation method of the super-matte PU odorless clear finishing paint specifically comprises the following steps:
step 1, mixing synthetic fatty acid modified odor purification alkyd resin, nitrocellulose resin, ether ester solvent, dispersant and defoamer, and dispersing uniformly under the condition of 600-800 r/min; then adding matting powder, glass powder and wax powder, and dispersing under the condition of 800-1200r/min until the fineness is less than or equal to 30 um; then adding an acrylic acid flatting agent, an organic silicon flatting agent and an ester solvent, and uniformly dispersing under the condition of 600-800r/min to obtain a component A;
step 2, adding a dehydrating agent into n-butyl acetate, sequentially adding an addition product polyisocyanate and a trimer curing agent after 24 hours, and uniformly stirring to obtain a component B;
step 3, mixing n-butyl acetate and ethyl acetate, and uniformly stirring to obtain a diluent;
the component A comprises 65-76.5% of synthetic fatty acid modified odor-removing alkyd resin, 3-5% of 1/16 nitrocellulose resin, 5-8% of ether ester solvent, 0.8-2% of dispersing agent, 0.2-0.5% of defoaming agent, 4.5-6.5% of matting powder, 3-4.5% of glass powder, 0.5-1% of wax powder, 0.3-0.5% of acrylic acid leveling agent, 0.2-0.3% of organic silicon leveling agent and 5-6.7% of ester solvent according to weight percentage;
the component B comprises 14.5 to 34.9 weight percent of n-butyl acetate, 0.1 to 0.5 weight percent of dehydrating agent, 35 to 45 weight percent of adduct polyisocyanate and 30 to 40 weight percent of trimer curing agent;
the diluent comprises, by weight, 35-50% of propylene glycol methyl ether acetate, 30-50% of n-butyl acetate and 15-20% of ethyl acetate.
The invention has the beneficial effects that: according to the super-matte PU odorless clear finish paint provided by the invention, the addition amount of matting powder can be obviously reduced and the matting effect of the matting powder can be improved by specifically selecting the synthetic fatty acid modified odorless alkyd resin, the 1/16 nitrocellulose resin and the two curing agents, the glossiness of a prepared paint film can reach three degrees and below 3 degrees, the super-matte effect is obtained, the problems that the existing matte clear finish paint is poor in matting effect and cannot reach 3 degrees and below 3 degrees are solved, and a coating prepared from the obtained clear finish paint has excellent transparency and good weather resistance.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
The invention provides a super-matte PU odor-free clear finishing coat, which comprises a component A, a component B and a diluent;
the component A comprises 65-76.5% of synthetic fatty acid modified odor-removing alkyd resin, 3-5% of nitrocellulose resin, 5-8% of ether ester solvent, 0.8-2% of dispersing agent, 0.2-0.5% of defoaming agent, 4.5-6.5% of matting powder, 3-4.5% of glass powder, 0.5-1% of wax powder, 0.3-0.5% of acrylic acid leveling agent, 0.2-0.3% of organic silicon leveling agent and 5-6.7% of ester solvent according to weight percentage;
the component B comprises 14.5 to 34.9 weight percent of n-butyl acetate, 0.1 to 0.5 weight percent of dehydrating agent, 35 to 45 weight percent of adduct polyisocyanate and 30 to 40 weight percent of trimer curing agent;
the diluent comprises, by weight, 35-50% of propylene glycol methyl ether acetate, 30-50% of n-butyl acetate and 15-20% of ethyl acetate.
From the above description, the beneficial effects of the present invention are: according to the super-matte PU odorless clear finish paint provided by the invention, the addition amount of matting powder can be obviously reduced and the matting effect of the matting powder can be improved by specifically selecting the synthetic fatty acid modified odorless alkyd resin, the 1/16 nitrocellulose resin and the two curing agents, the glossiness of a prepared paint film can reach three degrees and below 3 degrees, the super-matte effect is obtained, the problems that the existing matte clear finish paint is poor in matting effect and cannot reach 3 degrees and below 3 degrees are solved, and a coating prepared from the obtained clear finish paint has excellent transparency and good weather resistance.
Furthermore, the fineness of the synthetic fatty acid modified odorless alkyd resin is less than or equal to 15 μm, the hydroxyl value is 130 +/-10 mgKOH/g, and the viscosity is 25000-35000 cps.
Furthermore, the synthetic fatty acid modified odor-free alkyd resin is firstly made XC9855 odor-free alkyd resin or SY-3801-X-70 synthetic fatty acid modified odor-free alkyd resin of synthetic resin in Guangdong Heshan city.
As can be seen from the above description, the above odor-removing resin is selected to reduce the pungent odor of the final product, and to have high transparency and light-retaining property compared with the conventional alkyd resin, thereby achieving permanent light-retaining property.
Further, the nitrocellulose resin is 1/16 nitrocellulose resin. The northwest tai nitre 1/16 nitrocellulose resin is preferred.
Compared with the traditional 1/4-second nitrocellulose or 1/2 nitrocellulose, the 1/16 nitrocellulose resin has low viscosity and good fullness, is good in compatibility with the synthetic fatty acid modified odor-removing alkyd resin and the trimer curing agent, and is a paint film prepared by sharing the synthetic fatty acid modified odor-removing alkyd resin, the drying speed is high, the extinction performance is good, the hand feeling is fine and smooth, and the usage amount of the matting powder (matting powder) can be obviously reduced by using 1/16 nitrocellulose resin.
Further, the ether ester solvent is dioxy dimethyl ether acetate (PDM).
As can be seen from the above description, compared with PMA and CAC commonly used in the prior art, PDM has good dissolving power and is environmentally friendly and odorless.
Furthermore, the extinction powder is fumed silica, and the fineness of the glass powder is less than or equal to 30 microns.
Further, the matting powder is ED-2 of Grace, and the glass is VX-SP of Nippon Longson.
According to the description, the selection of the matting powder of the matte paint (matte coating) is crucial, and the high-transparency fumed silica is selected as the matting powder and is shared with the glass powder with the fineness less than or equal to 30 micrometers, so that a better matting effect can be obtained under the condition of the same addition amount of the matting powder, and meanwhile, the paint film can be ensured to have good hardness and wear resistance.
Further, the dispersing agent is a high-molecular block copolymer, the defoaming agent is modified polysiloxane, and the wax powder is polytetrafluoroethylene modified polyethylene micronized wax.
Further, the dispersing agent is EFKA-4010, the defoaming agent is BYK-141, and the wax powder is Germany BYK-996.
As can be seen from the above description, the addition of the dispersant can not only improve the dispersion effect, but also improve the arrangement effect of the matting powder, and the phenomenon of the plate surface after the matting powder is placed and smeared is caused to bloom; the polytetrafluoroethylene modified polyethylene micronized wax can be uniformly distributed and float on the surface of a paint film, and compared with common polyethylene wax powder, the polytetrafluoroethylene modified polyethylene micronized wax can enable the paint film to have fine and smooth hand feeling, has scratch resistance, and improves the hardness of the paint film.
Further, the acrylic acid leveling agent is fluorocarbon modified polyacrylate high polymer, and the organic silicon leveling agent is polyether modified polydimethylsiloxane.
Further, the acrylic leveling agent is EFKA-3777 or BYK-358N, and the organosilicon leveling agent is digao 450 or BYK-333.
The description shows that the addition of the acrylic acid leveling agent and the organic silicon leveling agent can effectively improve the long-wave leveling of the finished product during large-area spraying and coating construction, improve the wettability of the substrate and the surface smoothness, and simultaneously has an arrangement effect on the fumed silica of the polishing powder, thereby effectively improving the anti-fouling performance and the leveling performance of the finished product.
Further, the dehydrating agent is isocyanate. Further, the dehydrating agent is BF5 of Samsung chemical engineering, TI of Bayer or BF5 of Germany Samba.
As can be seen from the above description, the water content in n-butyl acetate is completely removed by using a dehydrating agent, the water content therein is completely reacted to become a gas to be discharged, and then the gas is mixed with isocyanate.
Further, the trimer curing agent is low molecular weight toluene diisocyanate. Further, the adduct polyisocyanate is Bayer L-75 or Bogh BG-L75, and the trimer curing agent is Bayer 1451 or Bogh BG-650 TB.
From the above description, it can be seen that the addition of the adduct polyisocyanate and the low molecular weight toluene diisocyanate as the curing agent has better compatibility with the synthetic fatty acid modified odor-removing alkyd resin and the 1/16 nitrocellulose resin and better curing effect than the single use.
The invention provides a preparation method of a super-matte PU odor-free clear finishing coat, which specifically comprises the following steps:
step 1, mixing synthetic fatty acid modified odor purification alkyd resin, nitrocellulose resin, ether ester solvent, dispersant and defoamer, and dispersing uniformly under the condition of 600-800 r/min; then adding matting powder, glass powder and wax powder, and dispersing under the condition of 800-1200r/min until the fineness is less than or equal to 30 um; then adding an acrylic acid flatting agent, an organic silicon flatting agent and an ester solvent, uniformly dispersing under the condition of 600-800r/min, and then inspecting.
Filtering and packaging to obtain a component A;
step 2, adding a dehydrating agent into n-butyl acetate, sequentially adding an addition product polyisocyanate and a trimer curing agent after 24 hours, uniformly stirring, and then inspecting and packaging to obtain a component B;
step 3, propylene glycol methyl ether acetate, n-butyl acetate and ethyl acetate are mixed and stirred uniformly, and then the diluent is obtained through inspection and packaging;
the component A comprises 65-76.5% of synthetic fatty acid modified odor-removing alkyd resin, 3-5% of nitrocellulose resin, 5-8% of ether ester solvent, 0.8-2% of dispersing agent, 0.2-0.5% of defoaming agent, 4.5-6.5% of matting powder, 3-4.5% of glass powder, 0.5-1% of wax powder, 0.3-0.5% of acrylic acid leveling agent, 0.2-0.3% of organic silicon leveling agent and 5-6.7% of ester solvent according to weight percentage;
the component B comprises 14.5 to 34.9 weight percent of n-butyl acetate, 0.1 to 0.5 weight percent of dehydrating agent, 35 to 45 weight percent of adduct polyisocyanate and 30 to 40 weight percent of trimer curing agent;
the diluent comprises, by weight, 35-50% of propylene glycol methyl ether acetate, 30-50% of n-butyl acetate and 15-20% of ethyl acetate.
From the above description, the beneficial effects of the present invention are: according to the preparation method provided by the invention, the component A is prepared by adopting a step-by-step addition method, compared with the traditional one-step addition and dispersion method, different stirring rates are selected according to different components, the compatibility among the component A is better, the dispersion effect is better, the matte effect and other properties of the paint film prepared by the obtained coating are improved to a certain extent, and meanwhile, the paint film prepared by the paint is also provided with a diluent, so that the diluent has excellent stability, can be stored for a long time, has good compatibility with the component A and the component B, has no side reaction, and cannot influence the super matte property of the obtained paint film after being diluted.
Example (b):
the composition of component A is shown in Table 1, the composition of component B is shown in Table 2, and the composition of diluent is shown in Table 3.
TABLE 1
Wherein, the synthetic fatty acid modified odor-purifying alkyd resin of A, B, C, D and E is XC9855, and the synthetic fatty acid modified odor-purifying alkyd resin of F, G, H and I is SY-3801-X-70; the nitro-cotton cellulose resins of the formazan A, the formazan B, the formazan C, the formazan F and the formazan G are all nitro-cotton cellulose resins of beifangtai nitre 1/16, and the nitro-cotton cellulose resins of the formazan H and the formazan I are respectively 1/2 nitro-cotton cellulose resins and 1/4 nitro-cotton cellulose resins; the acrylic acid leveling agents of A-E are EFKA3777, and the acrylic acid leveling agents of A-F-A I are BYK-358N; the organic silicon flatting agents of A-E are BYK333, and the organic silicon flatting agents of A-F-A I are digao 450; the ester solvents of A-I are all n-butyl acetate.
TABLE 2
Wherein, the dehydrating agents of the ethyl A, the ethyl B, the ethyl E and the ethyl F are BF5 of the samsung chemical industry, the dehydrating agent of the ethyl C is TI, and the dehydrating agent of the ethyl D is BF5 of German Ciba; the curing agent of the tripolymers of the B A, the B E and the B F is 1451, and the curing agent of the tripolymers of the B C and the B D is BG-650 TB.
TABLE 3
Example 1:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A, the component B is B A, and the diluent is diluted A.
Example 2:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is component A B, the component B is component B, and the diluent is diluent B.
Example 3:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is component A C, the component B is component B C, and the diluent is diluent C.
Example 4:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is component A D, the component B is component B D, and the diluent is diluent C.
Example 5:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is component A F, the component B is component B A, and the diluent is diluent A.
Example 6:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A G, the component B is B A, and the diluent is diluent A.
Example 7:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A, the component B is B A, and the diluent is diluted A.
Comparative example 1:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A E, the component B is B A, and the diluent is diluted A.
Comparative example 2:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A H, the component B is B A, and the diluent is diluted A.
Comparative example 3:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is component A I, the component B is component B A, and the diluent is diluent A.
Comparative example 4:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A, the component B is B E, and the diluent is diluent A.
Comparative example 5:
the super-matte PU odorless clear finishing coat consists of a component A, a component B and a diluent; the component A is A, the component B is B F, and the diluent is diluent A.
The preparation method of the super-matte PU odorless clear finish paint of the examples 1 to 3 and the comparative examples 1 to 5 specifically comprises the following steps:
step 1, mixing synthetic fatty acid modified odor purification alkyd resin, nitrocellulose resin, ether ester solvent, dispersant and defoamer, and dispersing uniformly under the condition of 800 r/min; then adding matting powder, glass powder and wax powder, and dispersing under the condition of 1200r/min until the fineness is less than or equal to 30 um; then adding an acrylic acid flatting agent, an organic silicon flatting agent and an ester solvent, dispersing uniformly under the condition of 800r/min, and then inspecting. Filtering and packaging to obtain a component A;
step 2, adding a dehydrating agent into n-butyl acetate, sequentially adding an addition product polyisocyanate and a trimer curing agent after 24 hours, uniformly stirring, and then inspecting and packaging to obtain a component B;
and 3, uniformly stirring the propylene glycol methyl ether acetate, the n-butyl acetate and the ethyl acetate, and then inspecting and packaging to obtain the diluent.
The preparation methods of the super-matte PU odorless clear top coats of examples 4-7 are different from those of examples 1-3 and comparative examples 1-5 in step 1, and the specific preparation method of examples 4-5 has the following steps: mixing synthetic fatty acid modified odor purification alkyd resin, nitrocellulose resin, ether ester solvent, dispersant and defoamer, and dispersing uniformly under the condition of 600 r/min; then adding matting powder, glass powder and wax powder, and dispersing under the condition of 800r/min until the fineness is less than or equal to 30 um; then adding an acrylic acid flatting agent, an organic silicon flatting agent and an ester solvent, dispersing uniformly under the condition of 600r/min, and then inspecting. Filtering and packaging to obtain the component A.
And (3) performance testing:
the A component and the B component of examples 1 to 7 and comparative examples 1 to 5 were mixed at a ratio of 100:50, and then spray coating test was carried out after adding a diluent to adjust to the respective construction viscosities (10-12"), and the results are shown in tables 4 to 5.
TABLE 4
TABLE 5
In conclusion, the super-matte PU odorless clear finish paint provided by the invention has the advantages that the addition amount of the matting powder can be remarkably reduced and the matting effect can be improved by specifically selecting and synthesizing the fatty acid modified odorless alkyd resin, the 1/16 nitrocellulose resin and the two curing agents, the glossiness of a prepared paint film can reach three degrees and below 3 degrees, the super-matte effect is obtained, the problems that the existing matte clear finish paint has poor matting effect and cannot reach 3 degrees and below 3 degrees are solved, the compatibility among components is good, the dispersibility is excellent, and a coating prepared from the obtained clear finish paint has excellent transparency and good weather resistance;
according to the preparation method provided by the invention, the component A is prepared by adopting a step-by-step addition method, compared with the traditional one-step addition and dispersion method, different stirring rates are selected according to different components, the compatibility among the component A is better, the dispersion effect is better, the matte effect and other properties of the paint film prepared by the obtained coating are improved to a certain extent, and meanwhile, the diluent is also provided, so that the diluent is beneficial to stability, can be stored for a long time, is good in compatibility with the component A and the component B, has no side reaction, and cannot influence the super matte property of the obtained paint film after being diluted.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.
Claims (9)
1. The super-matte PU odorless clear finishing paint is characterized by consisting of a component A, a component B and a diluent;
the component A comprises 65-76.5% of synthetic fatty acid modified odor-removing alkyd resin, 3-5% of 1/16 nitrocellulose resin, 5-8% of ether ester solvent, 0.8-2% of dispersing agent, 0.2-0.5% of defoaming agent, 4.5-6.5% of matting powder, 3-4.5% of glass powder, 0.5-1% of wax powder, 0.3-0.5% of acrylic acid leveling agent, 0.2-0.3% of organic silicon leveling agent and 5-6.7% of ester solvent according to weight percentage;
the component B comprises 14.5 to 34.9 weight percent of n-butyl acetate, 0.1 to 0.5 weight percent of dehydrating agent, 35 to 45 weight percent of adduct polyisocyanate curing agent and 30 to 40 weight percent of toluene diisocyanate trimer curing agent with low molecular weight;
the diluent comprises, by weight, 35-50% of propylene glycol methyl ether acetate, 30-50% of n-butyl acetate and 15-20% of ethyl acetate.
2. The super-matte PU odorless clear finish paint according to claim 1, characterized in that the component A comprises 75% of synthetic fatty acid modified odorless alkyd resin, 3% of 1/16 nitrocellulose resin, 5% of ether ester solvent, 1.2% of dispersing agent, 0.3% of defoaming agent, 6% of matting powder, 3% of glass powder, 0.8% of wax powder, 0.5% of acrylic leveling agent, 0.2% of organic silicon leveling agent and 5% of ester solvent in percentage by weight;
the component B comprises 24.5 percent of n-butyl acetate, 0.5 percent of dehydrating agent, 45 percent of adduct polyisocyanate curing agent and 30 percent of toluene diisocyanate trimer curing agent with low molecular weight according to weight percentage;
the diluent comprises 35% of propylene glycol methyl ether acetate, 50% of n-butyl acetate and 15% of ethyl acetate in percentage by weight.
3. The super-matte PU odorless clear finish paint according to claim 1, characterized in that the fineness of the synthetic fatty acid modified odorless alkyd resin is less than or equal to 15 μm, the hydroxyl value is 130 +/-10 mgKOH/g, and the viscosity is 25000-35000 cps.
4. The ultramatte PU clear top coat according to claim 1, wherein the ether ester solvent is dioxydimethyl ether acetate.
5. The super-matte PU odorless clear finish according to claim 1, characterized in that the matting powder is fumed silica, and the fineness of the glass powder is less than or equal to 30 μm.
6. The super-matte PU odorless clear finish according to claim 1, characterized in that the dispersant is a high molecular block copolymer, the defoamer is modified polysiloxane, and the wax powder is polytetrafluoroethylene modified polyethylene micronized wax.
7. The super-matte PU odor-free clear topcoat paint according to claim 1, wherein the acrylic leveling agent is fluorocarbon-modified polyacrylate high polymer, and the organic silicon leveling agent is polyether-modified polydimethylsiloxane.
8. The ultramatte PU odor-free clear topcoat according to claim 1, wherein the dehydrating agent is an isocyanate.
9. A process for the preparation of a super-matte PU clear top coat according to any of claims 1 to 8, comprising the steps of:
step 1, mixing synthetic fatty acid modified odor purification alkyd resin, 1/16 nitrocellulose resin, ether ester solvent, dispersant and defoamer, and dispersing uniformly under the condition of 600-800 r/min; then adding matting powder, glass powder and wax powder, and dispersing under the condition of 800-1200r/min until the fineness is less than or equal to 30 mu m; then adding an acrylic acid flatting agent, an organic silicon flatting agent and an ester solvent, and uniformly dispersing under the condition of 600-800r/min to obtain a component A;
step 2, adding a dehydrating agent into n-butyl acetate, sequentially adding adduct polyisocyanate and low-molecular-weight toluene diisocyanate trimer curing agent after 24 hours, and uniformly stirring to obtain a component B;
and 3, mixing propylene glycol methyl ether acetate, n-butyl acetate and ethyl acetate, and uniformly stirring to obtain the diluent.
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| CN115772360B (en) * | 2022-11-30 | 2023-07-21 | 沈阳盛达惠发化工有限公司 | High-solid odor-removing matte finishing paint and preparation and application methods thereof |
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