CN112430412A - PU sealing paint for UV paint, and preparation method and construction method thereof - Google Patents
PU sealing paint for UV paint, and preparation method and construction method thereof Download PDFInfo
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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
- C09D133/00—Coating 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
- C09D133/04—Homopolymers or copolymers of esters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
- B05D7/26—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials synthetic lacquers or varnishes
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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
- C09D7/20—Diluents or solvents
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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
- C09D7/45—Anti-settling agents
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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
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- Engineering & Computer Science (AREA)
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- Sealing Material Composition (AREA)
Abstract
The invention discloses a PU sealing paint for UV paint, a preparation method and a construction method thereof, and relates to the technical field of printing coatings, wherein the PU sealing paint for UV paint comprises a component A and a component B which are separately stored and mixed according to the weight part ratio of 1 (0.15-0.25) when in use, and the component A comprises the following raw materials in parts by weight: 15-30 parts of low-hydroxyl self-drying resin; 5-15 parts of PU white slurry; 6-10 parts of a first solvent; 30.5-64.2 parts of a second solvent; 5-15 parts of 25% CAB liquid; 0.1-0.3 part of defoaming agent; 0.2-0.5 part of dispersant; 0.5-3 parts of polyethylene wax anti-settling slurry; 0.1-0.3 part of molecular weight regulator; 0.1-0.3 part of catalyst; 0.6-0.8 part of filler; the component B comprises the following raw materials: 45-60 parts of isocyanate curing agent; 39.5-54.5 parts of a third solvent. The PU sealing paint for the UV paint has the advantages of being fast in self-drying and free of polishing.
Description
Technical Field
The application relates to the technical field of printing coatings, in particular to PU sealing paint for UV paint and a preparation method and a construction method thereof.
Background
The PU paint is a general name of all polyurethane coatings, and the film forming mode of the PU paint is natural film forming without special processes.
At present, the woodware coating in China is mainly made of PU and other oil paints, and is a coating with low VOCs content for woodworkers, which is advocated for new national environmental protection laws. According to research and development, more and more interior furniture enterprises tend to use water-based paint and UV paint with low VOCs content, particularly UV wood lacquer occupies the leading market in large and medium-sized wooden doors, decorative boards, kitchens and bathrooms, but the UV also needs PU to be matched at present, and PU is used for finishing color repair and sealing in many cases. The groove parts of a plurality of wooden doors, kitchens and bathrooms and the like can be sprayed with UV only after a sealing primer is firstly made, and the grooves are sprayed with finish paint together after the primer is made by PU (polyurethane) and the UV paint is rolled on the surfaces, so that the process has extremely high production efficiency; some grooves are sealed by PU only after one groove is formed, then the groove is sprayed with UV, but the PU paint needs to be polished, the time for drying is needed, the UV paint can be polished and sprayed after the PU paint is dried, especially in winter, the PU paint is dried slowly and can be polished at night, the production efficiency is seriously influenced for UV, and the requirement of a UV production line can not be met; the UV is directly used for spraying the seal primer, so that potential safety hazards exist, the seal primer is easy to crack, the paint is easy to fall off, and the like.
Aiming at the related technologies, the inventor thinks that the obtained PU seal coat has slow self-drying and needs to be polished in practical application, and the production efficiency is seriously influenced.
Disclosure of Invention
In order to improve the problem that PU seal coat is slow, need polish from drying in practical application, this application provides a PU seal coat for UV lacquer.
The application provides a PU sealing paint for UV lacquer adopts following technical scheme:
a PU sealing paint for UV paint comprises a component A and a component B which are stored separately and mixed according to the proportion of 1 (0.15-0.25) in parts by weight when in use, wherein the component A comprises the following raw materials in parts by weight:
15-30 parts of low-hydroxyl self-drying resin;
5-15 parts of PU white slurry;
6-10 parts of a first solvent;
30.5-64.2 parts of second solvent
5-15 parts of 25% CAB liquid;
0.1-0.3 part of defoaming agent;
0.2-0.5 part of dispersant;
0.5-3 parts of polyethylene wax anti-settling slurry;
0.1-0.3 part of molecular weight regulator;
0.1-0.3 part of catalyst;
0.6-0.8 part of filler;
the component B comprises the following raw materials:
45-60 parts of isocyanate curing agent;
39.5-54.5 parts of a third solvent.
By adopting the technical scheme, the molecular weight regulator can reduce the polymerization degree of the low-hydroxyl self-drying acrylic resin and the molecular weight of the low-hydroxyl self-drying acrylic resin, and increases the compatibility of CAB liquid and the low-hydroxyl self-drying acrylic resin, so that the self-drying effect of the PU sealing paint for the UV paint is accelerated; due to the adoption of the catalyst, the catalyst can promote the disconnection of double bonds of the low-hydroxyl self-drying acrylic resin and the resin in the UV paint, so that the low-hydroxyl self-drying acrylic resin and the resin in the UV paint react, and chemical bond force is formed between the low-hydroxyl self-drying acrylic resin and the resin in the UV paint, thereby obtaining the polishing-free effect of the PU sealing paint for the UV paint.
Preferably, the preferable weight part ratio of the component A to the component B is 1: 0.2.
by adopting the technical scheme, the component A is adopted: the component B is 1:0.2, thereby leading the PU sealing paint for the UV paint to obtain better self-drying and polishing-free effects.
Preferably, the hydroxyl value of the low hydroxyl type acrylic resin is 50 to 60.
By adopting the technical scheme, the PU sealing paint for the UV paint has better self-drying effect because the acrylic resin with the hydroxyl value of 50-60 is adopted, and the acrylic resin with the hydroxyl value of 50-60 has better self-drying property and better CAB liquid compatibility.
Preferably, the molecular weight regulator is any one or a mixture of mercaptoethanol and thioglycolic acid.
By adopting the technical scheme, as one or more molecular weight regulators in mercaptoethanol and thioglycolic acid are adopted, the mercaptoethanol and the thioglycolic acid are colorless and tasteless, and the residual quantity of the mercaptoethanol and the thioglycolic acid does not influence the sensory evaluation effect.
Preferably, the first solvent comprises toluene, the second solvent comprises ethyl acetate and butyl acetate, and the weight part ratio of the toluene to the ethyl acetate to the butyl acetate is (0.7-1.7): (4.5-5.5): 1.
by adopting the technical scheme, as the toluene, the ethyl acetate and the butyl acetate are adopted, the dissolving power of the butyl acetate, the toluene and the ethyl acetate is strong, and the volatilization speeds are inconsistent, so that the dilution and the reasonable volatilization gradient are obtained, the construction is convenient, and the defect-free effect of a paint film is ensured.
Preferably, the preferred weight part ratio of toluene, ethyl acetate and butyl acetate is 1.2:5: 1.
By adopting the technical scheme, the method adopts toluene: ethyl acetate: butyl acetate is 1.2: the ratio of 5:1, therefore, the effect of more reasonable volatilization gradient is obtained.
Preferably, the cyanate ester curing agent comprises HDI trimer and TDI trimer, and the weight ratio of the HDI trimer to the TDI trimer is 1: (1.5-2.5).
By adopting the technical scheme, as the HDI tripolymer is adopted, the HDI tripolymer is not yellowed and has good flexibility, and can generate chemical reaction with the synthetic fatty acid in the formula, so that the effects of improving the yellowing resistance and the toughness of the paint film are obtained. The TDI tripolymer has quick drying and yellowing resistance and can react with hydroxyl-containing groups in a formula, so that the effects of improving the hardness and strength of a paint film are achieved.
Preferably, the component B also comprises a dehydrating agent; the dosage of the dehydrating agent is 0.3-0.5 part of the mass of the solvent.
By adopting the technical scheme, the dehydrating agent has good compatibility with water, and can separate moisture from solvents such as butyl acetate and the like, and the moisture in the tank can be absorbed by the dehydrating agent, so that the storage and use effects of the curing agent are ensured.
The application provides a preparation method of PU sealing paint for UV paint, which at least comprises the following steps:
the method comprises the following steps: taking a special clean container to stir and disperse the low-hydroxyl self-drying acrylic resin, the CAB liquid, the PU white slurry, the first solvent, the defoaming agent, the dispersing agent, the polyethylene wax anti-settling slurry, the molecular weight regulator and the catalyst for 3-7min at the speed of 550-650r/min so as to uniformly mix the low-hydroxyl self-drying acrylic resin, the CAB liquid, the PU white slurry, the first solvent, the defoaming agent, the dispersing agent, the polyethylene wax anti-settling slurry and;
step two: sequentially adding the polyethylene wax anti-settling slurry and the second solvent into a container, dispersing for 8-12min at 550-650r/min to obtain a component A, and standing for later use;
step three: filling nitrogen into a clean specific container, sequentially adding the cyanate curing agent and the third solvent into the container after the container is filled with the nitrogen, dispersing for 13-17min at the speed of 750 plus 850r/min to obtain the component B, and standing for later use.
By adopting the technical scheme, the component A and the component B are dispersed by the dispersion machine, so that substances in the component A are fully mixed, and substances in the component B are fully mixed, and therefore, the effect of enabling the component A and the component B to be stored more stably is achieved.
The application provides a construction method of PU sealing paint for UV paint, which comprises the following steps:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1: (0.15-0.25) is added into a container and stirred for 3-7min at 550-650 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity until the viscosity is adjusted to 8.5-9.5 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-25 ℃ in a spraying mode, and the coating quantity is 40-60 g/square meter.
By adopting the technical scheme, the coating amount is controlled to be 40-60 g/square meter by adopting a spraying mode, and the PU sealing paint for the UV paint is adjusted to be proper in viscosity, so that the PU sealing paint for the UV paint is uniformly distributed on the surface of the base material, and therefore, the PU sealing paint for the UV paint obtains good adhesive force and film forming effect.
In summary, the present application has the following beneficial effects:
1. because the molecular weight regulator is adopted, the polymerization degree of the low-hydroxyl self-drying acrylic resin is reduced and the molecular weight of the low-hydroxyl self-drying acrylic resin is reduced by the molecular weight regulator, and the effect of accelerating the self-drying of the PU sealing paint for the UV paint is obtained;
2. the catalyst is preferably adopted in the application, and the low-hydroxyl self-drying acrylic resin and the resin in the UV paint are broken by the catalyst, so that the low-hydroxyl self-drying acrylic resin and the resin in the UV paint react, and the PU sealing paint for the UV paint has a polishing-free effect.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
Example 1
A PU sealing paint for UV paint comprises a component A and a component B which are stored separately and mixed according to the weight part ratio of 1:0.2 when in use, wherein each component and the corresponding weight part are shown in Table 1, and the PU sealing paint is prepared by the following steps:
the method comprises the following steps: adding low-hydroxyl self-drying acrylic resin, CAB liquid, PU white slurry, a first solvent, a defoaming agent, a dispersing agent, polyethylene wax anti-settling slurry, a molecular weight regulator and a catalyst into a special clean container, starting a dispersion machine, and stirring for 5min at 600 r/min;
step two: sequentially adding the polyethylene wax anti-settling slurry and a second solvent into a container, dispersing for 10min at the speed of 600r/min to obtain a component A, and storing for later use;
step three: filling nitrogen into a clean specific container, sequentially adding cyanate curing agent and third solvent into the container after the container is filled with nitrogen, dispersing for 15min at a speed of 800r/min to obtain component B, and storing for later use.
Note: the hydroxyl value of the low-hydroxyl self-drying acrylic resin is 50-60, and the low-hydroxyl self-drying acrylic resin is selected from the acrylic resin with the trade mark of AC 6552; the PU white paste is selected from B-063G; the first solvent is selected from toluene, a second solvent of ethyl acetate and butyl acetate; CAB liquid is selected from CRF-903; the defoaming agent is selected from F-5300; the dispersant is selected from EXKA-4010; the polyethylene wax anti-settling slurry is selected from Jiaming 201P; the molecular weight regulator is mercaptoethanol; the catalyst is selected from hydrogen sulfate liquid catalyst; the filling material is selected from transparent powder; the isocyanate curing agent comprises HDI tripolymer and TDI tripolymer, wherein the HDI tripolymer is selected from HT-100, and the TDI tripolymer is selected from IL-1451; the third solvent was selected to be butyl acetate.
Example 2: a PU sealer for UV paint, which differs from example 1 in that it is prepared by the following steps:
the method comprises the following steps: adding low-hydroxyl self-drying acrylic resin, CAB liquid, PU white slurry, a first solvent, a defoaming agent, a dispersing agent, polyethylene wax anti-settling slurry, a molecular weight regulator and a catalyst into a special clean container, starting a dispersing machine, and stirring for 3min at 550 r/min;
step two: sequentially adding the polyethylene wax anti-settling slurry and a second solvent into a container, dispersing for 8min at 550r/min to obtain a component A, and storing for later use;
step three: filling nitrogen into a clean specific container, sequentially adding the isocyanate curing agent and the third solvent into the container after the container is filled with the nitrogen, dispersing for 13min at 750r/min to obtain a component B, and storing for later use.
Example 3: a PU sealer for UV paint, which differs from example 1 in that it is prepared by the following steps:
the method comprises the following steps: adding low-hydroxyl self-drying acrylic resin, CAB liquid, PU white slurry, a first solvent, a defoaming agent, a dispersing agent, polyethylene wax anti-settling slurry, a molecular weight regulator and a catalyst into a special clean container, starting a dispersing machine, and stirring for 7min at 650 r/min;
step two: sequentially adding the polyethylene wax anti-settling slurry and a second solvent into a container, dispersing for 12min at 650r/min to obtain a component A, and storing for later use;
step three: filling nitrogen into a clean specific container, adding the isocyanate curing agent and the third solvent into the container in sequence after the container is filled with the nitrogen, dispersing for 17min at 850r/min to obtain a component B, and storing for later use.
Examples 4 to 5: a PU sealer for UV paint is different from example 1 in that each component and its corresponding weight fraction are shown in Table 1.
TABLE 1 Components and parts by weight of examples 1-5
Example 6: the PU sealing paint for the UV paint is different from the PU sealing paint in example 1 in that the component A and the component B are 1: mixing was carried out at a ratio of 0.15.
Example 7: the PU sealing paint for the UV paint is different from the PU sealing paint in example 1 in that the component A and the component B are 1: mixing was carried out at a ratio of 0.25.
Example 8: a PU sealer for UV paint, which is different from example 1 in that the hydroxyl value of the low-hydroxyl self-drying acrylic resin in the above step is 50.
Example 9: a PU sealer for UV paint, which is different from example 1 in that the hydroxyl value of the low-hydroxyl self-drying acrylic resin in the above step is 60.
Example 10: a PU sealer for UV paint is different from example 1 in that thioglycolic acid is used as the molecular weight regulator in the above step.
Example 11: a PU sealer for UV paint is different from example 1 in that the preferable weight ratio among toluene, ethyl acetate and butyl acetate is 0.7:4.5: 1.
Example 12: a PU sealing paint for UV paint is different from example 1 in that the preferable weight part ratio of toluene, ethyl acetate and butyl acetate is 1.7:5.5: 1.
Example 13: the PU sealing paint for the UV paint is different from the PU sealing paint in the embodiment 1 in that the weight part ratio of the HDI tripolymer to the TDI tripolymer is 1: 1.5.
example 14: the PU sealing paint for the UV paint is different from the PU sealing paint in the embodiment 1 in that the weight part ratio of the HDI tripolymer to the TDI tripolymer is 1: 2.5.
example 15: the PU sealing paint for the UV paint is different from the PU sealing paint in the embodiment 1 in that the third step is as follows: filling nitrogen into a clean specific container, sequentially adding cyanate curing agent, third solvent and dehydrating agent into the container after the container is filled with nitrogen, dispersing for 15min at the speed of 800r/min to obtain component B, and storing for later use.
Example 16: a construction method of PU sealing paint for UV paint adopts the following method to carry out construction:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1:0.2, adding the mixture into a container, and stirring for 5min at the speed of 600 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity of the mixture until the viscosity is adjusted to 9 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-26 ℃ in a spraying mode, and the coating weight is 50 per square meter.
Example 17: the construction method of the PU sealing paint for the UV paint is different from that of the embodiment 16 in that the following method is adopted for construction:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1: adding 0.2 of the mixture into a container, and stirring for 3min at the speed of 550 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity until the viscosity is adjusted to 8.5 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-26 ℃ in a spraying mode, and the coating weight is 40 g/square meter.
Example 18: the construction method of the PU sealing paint for the UV paint is different from that of the embodiment 16 in that the following method is adopted for construction:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1: adding 0.2 of the mixture into a container, and stirring for 7min at the speed of 650 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity until the viscosity is adjusted to 9.5 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-26 ℃ in a spraying mode, and the coating weight is 60 g/square meter.
Note: the dehydrating agent is FY-180.
Comparative example 1: a PU seal coat for UV paint is different from the PU seal coat in the embodiment 1 in that the first step is as follows: adding the low-hydroxyl self-drying acrylic resin, CAB liquid, PU white slurry, a first solvent, a defoaming agent, a dispersing agent, polyethylene wax anti-settling slurry and a catalyst into a special clean container, starting a dispersing machine, and stirring for 5min at 600 r/min.
Comparative example 2: a PU seal coat for UV paint is different from the PU seal coat in the embodiment 1 in that the first step is as follows: adding the low-hydroxyl self-drying acrylic resin, CAB liquid, PU white slurry, a first solvent, a defoaming agent, a dispersing agent, polyethylene wax anti-settling slurry and a molecular weight regulator into a special clean container, starting a dispersion machine, and stirring for 5min at 600 r/min.
Comparative example 3: a PU seal coat for UV paint is different from the PU seal coat in the embodiment 1 in that the first step is as follows: taking a special clean container, adding the low-hydroxyl self-drying acrylic resin, CAB liquid, PU white slurry, a first solvent, a defoaming agent, a dispersing agent and polyethylene wax anti-settling slurry into a dispersion cylinder, starting a dispersion machine, and stirring for 5min at 600 r/min.
Comparative example 4: a PU sealer for UV paint, which is different from example 1 in that the hydroxyl value of the above-mentioned low-hydroxyl type acrylic resin is 45.
Comparative example 5: a PU sealer for UV paint, which is different from example 1 in that the hydroxyl value of the above-mentioned low-hydroxyl type acrylic resin is 65.
Comparative example 6: the construction method of the PU sealing paint for the UV paint is different from that of the embodiment 16 in that the following method is adopted for construction:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1:0.2, adding the mixture into a container, and stirring for 2min at the speed of 500 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity until the viscosity is adjusted to 7 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-26 ℃ in a spraying mode, and the coating weight is 30 g/square meter.
Comparative example 7: the construction method of the PU sealing paint for the UV paint is different from that of the embodiment 16 in that the following method is adopted for construction:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1:0.2, adding the mixture into a container, and stirring for 8min at the speed of 700 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity until the viscosity is adjusted to 11 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-26 ℃ in a spraying mode, and the coating weight is 70 g/square meter.
Performance test
Sample preparation:
a. wiping (or washing with a solvent) the substrate clean;
b. the PU sealing paints for UV paints obtained in examples 1 to 15 and comparative examples 1 to 5 were applied to the treated substrates according to the application method of the national standard GB 67536.6-86 to form a paint film of 5mm thickness;
c. drying at 25 deg.C for 1 hr to obtain test samples 1-15 and control samples 1-5;
d. the PU sealing paint for UV paint obtained in example 1 was applied to a treated substrate to form a paint film of 5mm thickness by the application methods of example 16, example 17 and example 18, and dried at 25 ℃ for 1 hour to obtain test samples 16 to 18;
e. the PU sealing paint for UV paint obtained in example 1 was applied to the treated substrate to form a paint film of 5mm thickness by the application methods of comparative examples 6 and 7, and dried at 25 ℃ for 1 hour to obtain comparative samples 6 to 7; the experimental tool is a cross-cut tester, which is a multi-blade cutter with 6 cutting surfaces, and the length between the cutters is lmm, 2mm and 3mm (the cutter head can be replaced). A scriber is used to pull 3-4cm in parallel, six cuts are made, the paint film is cut through to the substrate, then the paint film is perpendicular to the substrate by the same method, and the same six cuts are made, so that a plurality of small squares are formed. For soft substrates, the grading was performed by forming each diagonal line along the grid pattern with a soft brush and sweeping several times gently forward and backward. For hard substrates, the hard substrates are cleaned firstly, an adhesive tape (generally a 3M adhesive tape is used) is attached after cleaning, the adhesive tape is ensured to be in full contact with an experimental area, the adhesive tape can be in good contact by rubbing back and forth with fingers, then the adhesive tape is pulled away quickly, and comparison and grading are carried out by using visual or magnifier to contrast a standard. The criteria for its classification are described as:
the 0-level cutting edge is completely smooth, and no lattice falls off;
a little coating layer falls off at the 1-level intersection, and the affected area cannot be obviously more than 5%;
stage 2 has coating shedding at the intersection of the cuts or along the cut edges. The influence area is 5% -15%;
the cross cutting area of the 3-grade coating which is affected by large-area falling along the cutting edge part or the whole is 15 to 35 percent;
the whole 4-level lattice falls off along the edge, and some lattices partially or completely fall off, so that the affected area is 35-65%.
The test method comprises the following steps: firstly, a fan is placed in a constant temperature and humidity box, the wind speed required by the experiment is adjusted, and the constant temperature and humidity box is adjusted to a certain temperature and humidity. After the wind speed, the temperature and the humidity are stable, diluting the UV paint to be tested to the construction viscosity by using PU sealing paint according to construction instructions, constructing the sand blasting steel plate by using airless spraying, immediately putting the steel plate into a constant temperature and constant humidity box after the spraying is finished, starting timing, observing the drying condition of the paint, and recording the surface drying time. And (5) rechecking the thickness of the paint film after the paint film is completely dried.
And (3) test results: and (3) test results: the test results of the test samples 1 to 15 and the control samples 1 to 5 are shown in Table 2. As can be seen from Table 2, the results of the tests of examples 1 to 5 and comparative examples 1 to 3 are compared: the component A is added with a molecular weight regulator, so that the self-drying of the PU sealing paint for the UV paint can be greatly accelerated; the catalyst is added into the component A, so that the adhesive force of the UV paint on the PU sealing paint can be greatly improved, and the polishing-free effect is achieved. Compared with the test results of the example 1 and the comparative examples 4 to 5, the low-hydroxyl self-drying acrylic resin with the hydroxyl value of 50 to 60 is selected to improve the self-drying property and the non-sanding property of the UV paint in the PU sealing paint.
TABLE 2 test results of test samples 1-18 and control samples 1-7
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A PU sealing paint for UV paint comprises a component A and a component B which are stored separately and mixed according to the proportion of 1 (0.15-0.25) in parts by weight when in use, wherein the component A comprises the following raw materials in parts by weight:
15-30 parts of low-hydroxyl self-drying resin;
5-15 parts of PU white slurry;
6-10 parts of a first solvent;
30.5-64.2 parts of second solvent
5-15 parts of 25% CAB liquid;
0.1-0.3 part of defoaming agent;
0.2-0.5 part of dispersant;
0.5-3 parts of polyethylene wax anti-settling slurry;
0.1-0.3 part of molecular weight regulator;
0.1-0.3 part of catalyst;
0.6-0.8 part of filler;
the component B comprises the following raw materials:
45-60 parts of isocyanate curing agent;
39.5-54.5 parts of a third solvent.
2. PU sealing paint for UV paint according to claim 1, characterized in that the preferred weight portion ratio between the A component and the B component is 1: 0.2.
3. PU sealer for UV paint according to claim 1, wherein the hydroxyl value of said low hydroxyl type acrylic resin is 50-60.
4. The PU sealer for UV paint according to claim 1, wherein the molecular weight regulator is any one or a mixture of mercaptoethanol and mercaptoacetic acid.
5. The PU sealer for UV paint according to claim 1, wherein the first solvent comprises toluene, the second solvent comprises ethyl acetate and butyl acetate, and the weight ratio of toluene, ethyl acetate and butyl acetate is (0.7-1.7): (4.5-5.5): 1.
6. PU sealer for UV paint according to claim 5, wherein the preferred weight part ratio between toluene, ethyl acetate and butyl acetate is 1.2:5: 1.
7. The PU sealer for UV paint according to claim 1, wherein the cyanate ester-based curing agent comprises HDI trimer and TDI trimer, and the weight part ratio of HDI trimer to TDI trimer is 1: (1.5-2.5).
8. PU sealer for UV paint according to claim 1, characterized in that said B component further comprises a dehydrating agent; the dosage of the dehydrating agent is 0.3-0.5 part of the mass of the solvent.
9. The process for the preparation of a PU sealer for UV paint according to claim 1, characterized by comprising the steps of:
the method comprises the following steps: taking a special clean container to stir and disperse the low-hydroxyl self-drying acrylic resin, the CAB liquid, the PU white slurry, the first solvent, the defoaming agent, the dispersing agent, the polyethylene wax anti-settling slurry, the molecular weight regulator and the catalyst for 3-7min at the speed of 550-650r/min so as to uniformly mix the low-hydroxyl self-drying acrylic resin, the CAB liquid, the PU white slurry, the first solvent, the defoaming agent, the dispersing agent, the polyethylene wax anti-settling slurry and;
step two: sequentially adding the polyethylene wax anti-settling slurry and the second solvent into a container, dispersing for 8-12min at 550-650r/min to obtain a component A, and standing for later use;
step three: filling nitrogen into a clean specific container, sequentially adding the cyanate curing agent and the third solvent into the container after the container is filled with the nitrogen, dispersing for 13-17min at the speed of 750 plus 850r/min to obtain the component B, and standing for later use.
10. The method of applying the PU sealer for UV paint according to claim 1, wherein the steps comprise:
s1: taking a clean special container, and mixing the component A and the component B according to the ratio of 1: (0.15-0.25) is added into a container and stirred for 3-7min at 550-650 r/min;
s2: then dropwise adding diluent toluene, stirring, and measuring the viscosity until the viscosity is adjusted to 8.5-9.5 s;
s3: after the mixing is finished, construction is carried out at the temperature of 23-26 ℃ in a spraying mode, and the coating quantity is 40-60 g/square meter.
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| CN202011019265.8A CN112430412A (en) | 2020-09-24 | 2020-09-24 | PU sealing paint for UV paint, and preparation method and construction method thereof |
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| CN202011019265.8A CN112430412A (en) | 2020-09-24 | 2020-09-24 | PU sealing paint for UV paint, and preparation method and construction method thereof |
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| CN114316774A (en) * | 2022-01-07 | 2022-04-12 | 上海立邦长润发涂料有限公司 | Polishing-free PU (polyurethane) color-modifying finishing paint for UV (ultraviolet) and construction method thereof |
| CN116102964A (en) * | 2022-12-08 | 2023-05-12 | 上海立邦长润发涂料有限公司 | PU color-modifying paint for UV and preparation method thereof |
| CN116120788A (en) * | 2022-12-23 | 2023-05-16 | 澳达树熊涂料(惠州)有限公司 | Single-component filler capable of preventing blushing as well as preparation method and application thereof |
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