Environment-friendly chromium-free color-adjustable film primer as well as preparation method and application thereof

Abstract

The invention relates to an environment-friendly chromium-free color-adjustable film primer, which comprises a coloring pigment, has a color adjusting function, can be independently used without being matched with finish paint, and comprises the following components in percentage by mass: 10-90% of polyester resin, 2-50% of an anticorrosive pigment, 1-50% of the coloring pigment, 3-30% of a solvent and 0.5-9% of an auxiliary agent, totaling 100%. The environment-friendly chromium-free color-adjustable film-pasting primer has the conventional functions of good adhesive force, corrosion resistance and the like, can meet the decorative requirements of green environmental protection and various color display effects, does not contain harmful substances such as chromium, has low VOC (Volatile Organic Compounds) and higher corrosion resistance, can be subjected to color adjustment according to different requirements, can be directly pasted with a film after being coated with the primer, and has the advantages of environmental protection, environmental protection and the like. And the use of finish paint is omitted. The film can be matched with transparent and semitransparent films to show the decoration, and can also be matched with non-transparent PVC (polyvinyl chloride), PET (polyethylene terephthalate) and other films to obtain a product with higher boiling performance. The invention also relates to a preparation method and application of the environment-friendly chromium-free color-adjustable film primer.

Description

Technical Field

[0001] The present invention relates to the fields of household appliances and industrial coatings, and in particular to an environmentally friendly chromium-free color-adjustable film primer for building material coils, and a preparation method and application thereof. Background Art

[0002] Steel sheets with cold-rolled steel sheets or galvanized steel sheets as the base material and painted are also called pre-painted color steel sheets, which can be used for various purposes such as external parts of home appliances such as air conditioner outdoor units and water heaters, and external building materials such as roofs and walls. Usually, color-coated sheets are painted by roller coating, with different topcoats for different functional and decorative needs.

[0003] With the development of science and technology, people have higher and higher requirements on functionality, decoration, production efficiency, etc., and the method of using film to produce color-coated plates has attracted more and more attention. This method of using film to replace the original topcoat coating process has better decoration and its surface quality control also has obvious advantages.

[0004] However, the method of producing color-coated plates with film has higher requirements for primers. Commonly used steel coil primers mainly play the role of connecting the substrate and the topcoat to improve adhesion and anti-corrosion. For film primers, in addition to the conventional function of connecting the substrate and the film, for pasting transparent or translucent films, they also need to have decorative properties, that is, to partially replace the display effects of various colors of the original topcoat. This is a big challenge for the existing single-color primer formula system.

[0005] In view of this, there is an urgent need to develop a primer suitable for the production of color-coated plates using film, which, while having conventional functions such as good adhesion and anti-corrosion, meets the decorative needs of green, environmentally friendly, chromium-free and various color display effects, so as to meet the needs of the home appliance and industrial coatings fields and solve the problems existing in the prior art. Summary of the invention

[0006] Based on the above problems, the purpose of the present invention is to provide an environmentally friendly chrome-free color-adjustable film primer for building material coils and its preparation method and application. The environmentally friendly chrome-free color-adjustable film primer does not contain harmful substances such as chrome, has low VOC and high anti-corrosion performance, can be toned according to different needs, and can be directly filmed after the primer is applied, eliminating the use of topcoat. It can be used with transparent and translucent films to show its decorativeness, and can also be used with opaque PVC, PET and other films to obtain products with higher water boiling performance.

[0007] The first aspect of the present invention provides an environmentally friendly chrome-free color-adjustable film primer, which contains a coloring pigment, has a coloring function, and can be used alone without a topcoat. The components thereof, calculated by mass percentage, include:

[0008]

[0009] The total mass percentage of the above components is 100%.

[0010] In some preferred embodiments of the present invention, the environmentally friendly chrome-free color-adjustable film primer further includes one or more of a curing agent, a catalyst, and a filler. In terms of mass percentage, the environmentally friendly chrome-free color-adjustable film primer includes:

[0011]

[0012] The total mass percentage of the above components is 100%.

[0013] Polyester resin

[0014] In some embodiments of the present invention, the polyester resin is selected from polyester resins having a hydroxyl value of 2-50 mgKOH / g and a number average molecular weight of 2000-20000.

[0015] Specifically, the polyester resin is selected from one or more of the polyester resins of models DYNAPOL LH 818-05AN, DYNAPOL LH 820-05AN, DYNAPOL LH 826-05AN, DYNAPOL LH 831-05AN provided by Evonik, and models ES420 and ES710 provided by SK.

[0016] Anticorrosive pigments

[0017] In some embodiments of the present invention, the anticorrosive pigment is selected from PAT30, XCA02, Grace SHIELDEX C303, SHIELDEX AC 3, Phosphate series LF BOWSEIPM-308, LF BOWSEIMZP-500, K-WHITE G105, K-WHITE G110, K-WHITE G82, EP855, QS301, QS-302, QS-303, 102F, One or more of ZP 10, NP 001 PIC pigment, NP 031 PIC pigment, Sivision AC 302.

[0018] Coloring Pigments

[0019] In the present invention, the coloring pigment is selected from one or more of inorganic pigments and organic pigments.

[0020] In some embodiments of the present invention, the inorganic pigment is selected from one or more of the following: R-996 titanium dioxide provided by Chemours, R-216 titanium dioxide provided by China National Nuclear Corporation, BAYFERROX 4905, fw200 carbon black, iron yellow, iron red, and cobalt blue. The organic pigment is selected from one or more of JHV-2303w pigment violet, DDP red, phthalocyanine blue, and PY139.

[0021] Curing agent

[0022] In the present invention, the curing agent is selected from one or more of amino resin and blocked isocyanate. Calculated by mass percentage, the environmentally friendly chromium-free color-adjustable film primer contains:

[0023] Amino resin 0-25%

[0024] Blocked isocyanate 0-25%

[0025] The total mass percentage of the above components is 0-50%;

[0026] Specifically, the amino resin includes but is not limited to one or more of the amino resins with models cycmel303, cycmel325 provided by Zhanxin Company, models YP5627B, YP5605, YP5603 provided by Yuanbang Company, or model Changxing 9603, and the blocked isocyanate includes but is not limited to one or more of the blocked isocyanates with models DESMODUR BL 3175SN, SUMIDURBL3175, and RHEBL 3075.

[0027] catalyst

[0028] The catalyst is selected from the model provided by King Company. One or more of the organic acids of 4000, XC300, N2500, N1051 or DBTDL organotin.

[0029] filler

[0030] In some embodiments of the present invention, the filler is selected from one or more of kaolin, talc, and barium sulfate.

[0031] Solvents

[0032] In some embodiments of the present invention, the solvent is selected from one or more of propylene glycol methyl ether, propylene glycol methyl ether acetate, and butyl acetate.

[0033] Additives

[0034] In some embodiments of the present invention, the auxiliary agent is selected from one or more of a defoamer, a leveling agent, a wetting agent, and an adhesion promoter. Calculated by mass percentage, the environmentally friendly chrome-free color-adjustable film primer contains:

[0035]

[0036] The total mass percentage of the above components is 0.5-9%.

[0037] The second aspect of the present invention provides a method for preparing the environmentally friendly chromium-free color-adjustable film primer according to the first aspect of the present invention, comprising the following steps:

[0038] S1: Under stirring, add part of polyester resin, part of solvent and part of additive into the container in sequence, disperse them with a high-speed disperser for 15-30 minutes, and control the stirring rate at 1500-2000rpm to obtain a uniformly mixed material A;

[0039] S2: Keep stirring, control the stirring rate at 2800-3500rpm, gradually add coloring pigment and anticorrosive pigment to material A to obtain a uniformly mixed material B; preferably, control the viscosity of the material B to be about 100KU;

[0040] S3: Stop stirring, transfer material B to a sand mill, and grind for 10 hours until the fineness is ≤15 μm to obtain material C;

[0041] S4: Transfer material C to a dilution kettle, add the remaining polyester resin and the remaining additives in sequence, and use the remaining solvent to adjust the viscosity to obtain the environmentally friendly chrome-free color-adjustable film primer with a 25°C T4 cup viscosity of 120s and a solid content of 60±3%.

[0042] The third aspect of the present invention provides an application of the environmentally friendly chromium-free color-adjustable film primer described in the first aspect of the present invention, characterized in that the film primer is applied as a pre-coat on a coiled steel.

[0043] In some embodiments of the present invention, the environmentally friendly chromium-free color-adjustable film primer is used in the coating of household appliance coils. The household appliance coils may be pre-treated before use, and the pre-treatment is a chromium-free pre-treatment.

[0044] In some embodiments of the present invention, the environmentally friendly chromium-free color-adjustable film primer is used in the coating of building material coils; preferably, the material of the building material coils is selected from one of hot-dip galvanizing, electro-galvanizing, and cold-rolled plates.

[0045] In some preferred embodiments of the present invention, the coating process of the primer is: 10# wire rod, baking time 23s, PMT 232°C; more preferably, the steel plate coated with the film primer is immediately filmed after leaving the oven, the filming temperature is PMT> 180°C, and the film pressing pressure is 2kg / cm 2 .

[0046] In some embodiments of the present invention, the film is selected from one of a transparent polyester film, a PVC film, a printing film, a printed film, and a biaxially stretched film.

[0047] Beneficial Effects of the Invention

[0048] Compared with the prior art, the environmentally friendly chrome-free color-adjustable film primer provided by the present invention does not contain harmful substances such as chrome, has low VOC and high anti-corrosion performance, can be toned according to different needs, and can be directly applied after the primer is applied, eliminating the need for topcoat. It can be used with transparent and translucent films to show its decorativeness, and can also be used with opaque PVC, PET and other films to obtain products with higher water boiling performance. DETAILED DESCRIPTION

[0049] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0050] The technical solution of the present invention is described below in conjunction with some specific embodiments.

[0051] Example 1-3: Environmentally friendly chrome-free color-adjustable film primer 1-3

[0052] According to the formula in Table 1, environmentally friendly chrome-free color-adjustable film primers 1-3 are prepared, and the preparation methods are all in the following steps:

[0053] S1: Under stirring, add part of the polyester resin, part of the solvent, and the wetting agent to the container in sequence, and disperse them with a high-speed disperser for 15-30 minutes, with the stirring rate controlled at 1500-2000 rpm to obtain a uniformly mixed material A;

[0054] S2: Keep stirring, control the stirring rate at 2800-3500rpm, gradually add coloring pigment, anticorrosive pigment and filler to material A to obtain a uniformly mixed material B; preferably, control the viscosity of the material B to be about 100KU;

[0055] S3: Stop stirring, transfer material B to a sand mill, and grind for 10 hours until the fineness is ≤15 μm to obtain material C;

[0056] S4: Transfer material C to a dilution kettle, add the remaining polyester resin, blocked isocyanate, amino resin, catalyst, adhesion promoter, defoamer and leveling agent in sequence, and use the remaining solvent to adjust the viscosity to obtain the environmentally friendly chrome-free color-adjustable film primer 1-3 with a 25°C T4 cup viscosity of 120s and a solid content of 60±3%.

[0057] Table 1: Formula of Examples 1-3

[0058]

[0059] The environmentally friendly chrome-free color-adjustable film-sticking primer obtained in Examples 1-3 was coated with a No. 10 wire rod, and the process was: baking time 23s, PMT 232°C, and supporting film-sticking process: PMT>180°C.

[0060] The corresponding baking conditions were used for baking and transparent film pasting, and the performance was shown in Table 2.

[0061] Table 2 Corresponding results of transparent film pasting

[0062]

[0063] The corresponding baking conditions were used for baking and aluminum film lamination, and the performance was shown in Table 3.

[0064] Table 3 Corresponding results of aluminum film pasting

[0065]

[0066]

[0067] The corresponding baking conditions were used for baking and drawing film pasting, and the properties are shown in Table 4.

[0068] Table 4 Corresponding results of wire drawing film

[0069]

[0070] From the results in Tables 2-4, it can be seen that the primer of the present invention has a color adjustment function and can be used alone without a topcoat. It is environmentally friendly and chromium-free. After coating and curing, the corresponding transparent film, wire drawing die and aluminum film are attached, and they all have excellent T-bend, adhesion, impact resistance, and processability. In the experiments, except for Example 3, the adhesion of the cross cup protrusion of the wire drawing film is slightly poor when boiled in water, the other films can be boiled in water for more than 10 minutes without cracking or falling off.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. An environmentally friendly chrome-free color-adjustable film primer, characterized in that: The primer contains a coloring pigment, and its components include, by weight percentage: The total mass percentage of the above components is 100%.

2. The environmentally friendly chromium-free color-adjustable film primer according to claim 1, characterized in that: The environmentally friendly chrome-free color-adjustable film primer also includes one or more of a curing agent, a catalyst, and a filler. Calculated by mass percentage, the environmentally friendly chrome-free color-adjustable film primer includes: The total mass percentage of the above components is 100%.

3. The environmentally friendly chromium-free color-adjustable film primer according to claim 1 or 2, characterized in that: The polyester resin is selected from polyester resins having a hydroxyl value of 2-50 mgKOH / g and a number average molecular weight of 2000-20000; preferably, the polyester resin is selected from one or more of the polyester resins of models DYNAPOL LH 818-05AN, DYNAPOL LH 820-05AN, DYNAPOL LH 826-05AN, DYNAPOL LH 831-05AN provided by Evonik, and models ES420 and ES710 provided by SK.

4. The environmentally friendly chromium-free color-adjustable film primer according to claim 1 or 2, characterized in that: The anticorrosive pigment is selected from PAT30, XCA02, Grace SHIELDEX C303, SHIELDEX AC 3, Phosphate series LF BOWSEIPM-308, LF BOWSEI MZP-500, K-WHITE G105, K-WHITE G110, K-WHITE G82, EP855, QS301, QS-302, QS-303, 102F, One or more of ZP 10, NP 001 PIC pigment, NP 031 PIC pigment, Sivision AC 302.

5. The environmentally friendly chromium-free color-adjustable film primer according to claim 1 or 2, characterized in that: The coloring pigment is selected from one or more of inorganic pigments and organic pigments, and the solvent is selected from one or more of propylene glycol methyl ether, propylene glycol methyl ether acetate, and butyl acetate; preferably, the inorganic pigment is selected from one or more of titanium dioxide model R-996 provided by Chemours, titanium dioxide model R-216 provided by China National Nuclear Corporation, BAYFERROX 4905, fw200 carbon black, iron yellow, iron red, and cobalt blue, and the organic pigment is selected from one or more of JHV-2303w pigment violet, DDP red, phthalocyanine blue, and PY139.

6. The environmentally friendly chromium-free color-adjustable film primer according to claim 2, characterized in that: The curing agent is selected from one or more of amino resins and blocked isocyanates. Calculated by mass percentage, the environmentally friendly chromium-free color-adjustable film primer contains: Amino resin 0-25% Blocked isocyanate 0-25% The total mass percentage of the above components is 0-50%; The amino resin includes but is not limited to one or more of the amino resins of model cycmel303 and cycmel325 provided by Zhanxin Company, model YP5627B, YP5605, YP5603 provided by Yuanbang Company or model Changxing 9603; the blocked isocyanate includes but is not limited to one or more of the blocked isocyanates of model DESMODUR BL 3175SN, SUMIDUR BL3175 and RHEBL3075; the catalyst is selected from one or more of the blocked isocyanates of model cyclopentane provided by King Company. One or more of the organic acids of 4000, XC300, N2500, N1051 or DBTDL organotin; the filler is one or more of kaolin, talc, and barium sulfate.

7. The environmentally friendly chromium-free color-adjustable film primer according to claim 1 or 2, characterized in that: The auxiliary agent is selected from one or more of a defoamer, a leveling agent, a wetting agent, and an adhesion promoter. Calculated by mass percentage, the environmentally friendly chrome-free color-adjustable film primer contains: The total mass percentage of the above components is 0.5-9%.

8. A method for preparing the environmentally friendly chromium-free color-adjustable film primer according to any one of claims 1 to 7, characterized in that: The steps include: S1: Under stirring, add part of polyester resin, part of solvent and part of additive into the container in sequence, disperse them with a high-speed disperser for 15-30 minutes, and control the stirring rate at 1500-2000rpm to obtain a uniformly mixed material A; S2: Keep stirring, control the stirring rate at 2800-3500rpm, gradually add coloring pigment and anticorrosive pigment to material A to obtain a uniformly mixed material B; preferably, control the viscosity of the material B to be about 100KU; S3: Stop stirring, transfer material B to a sand mill, and grind for 10 hours until the fineness is ≤15 μm to obtain material C; S4: Transfer material C to a dilution kettle, add the remaining polyester resin and the remaining additives in sequence, and use the remaining solvent to adjust the viscosity to obtain the environmentally friendly chrome-free color-adjustable film primer with a 25°C T4 cup viscosity of 120s and a solid content of 60±3%.

9. An application of the environmentally friendly chrome-free color-adjustable film primer as claimed in any one of claims 1 to 7, characterized in that: The environmentally friendly chrome-free color-adjustable film primer is applied as a pre-coat paint on coils and steel coils; preferably, the steel coils are selected from one of home appliance steel coils and building material steel coils; more preferably, the home appliance steel coils may be pre-treated before use, the pre-treatment being a chrome-free pre-treatment, and the building material steel coils are made of one of hot-dip galvanizing, electro-galvanizing and cold-rolled plates.

10. The use of the environmentally friendly chromium-free color-adjustable film primer according to claim 9, characterized in that: The coating process of the environmentally friendly chrome-free color-adjustable film primer as a pre-coating paint on the coil and coil steel is: 10 wire rod, baking time 23s, PMT232℃; preferably, the steel plate coated with the film primer is immediately filmed after leaving the oven, the filming temperature is PMT>180℃, and the film pressing pressure is 2kg / cm 2 More preferably, the film is selected from one of transparent polyester film, PVC film, printing film, printed film and biaxially stretched film.

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