CN113480933A - Hard PVC water-based white coating and preparation method thereof - Google Patents
Hard PVC water-based white coating and preparation method thereof Download PDFInfo
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- CN113480933A CN113480933A CN202110629737.XA CN202110629737A CN113480933A CN 113480933 A CN113480933 A CN 113480933A CN 202110629737 A CN202110629737 A CN 202110629737A CN 113480933 A CN113480933 A CN 113480933A
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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Abstract
The invention discloses a hard PVC water-based white paint and a preparation method thereof, wherein the hard PVC water-based white paint comprises the following raw materials in percentage by weight: 50-55% of polyurethane modified water-based acrylic emulsion, 0.3-0.6% of defoaming agent, 0.2-0.5% of wetting agent, 0.3-0.5% of surfactant, 0.1-0.2% of ammonia neutralizing agent, 0.2-0.5% of flatting agent, 0-2% of matte powder, 2-5% of film-forming assistant, 2-10% of deionized water, 25-30% of water-based white slurry, 0.05-0.1% of in-tank bactericide, 1-5% of wax emulsion and 0.1-2% of thickening agent, wherein the polyurethane modified water-based acrylic emulsion is one or two of polyurethane modified water-based acrylic emulsions of Opadry and DSM company. The hard PVC water-based white paint and the preparation method can realize that the adhesion force on the hard PVC can be well played by selecting the special polyurethane modified water-based acrylic emulsion, and meanwhile, in a weather resistance test, the weather resistance is within QUA 360 hours, and the delta E is less than or equal to 0.5.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a hard PVC water-based white coating and a preparation method thereof.
Background
The PVC water-based white paint is a high-molecular paint with excellent toughness, which is prepared by taking a high-molecular waterproof emulsion as a base material and adding additives such as ethylene propylene rubber, a softening agent and the like and fillers, is water-based single-component, forms an integral waterproof layer without seams after curing, has excellent waterproof performance, can be constructed on wet and dry base planes of various materials by taking water as a dispersion medium, is nontoxic and tasteless, has firm bonding force, high coating elasticity, high strength and high bonding force, has high elongation, strong adaptability to basic shrinkage and deformation, good low-temperature flexibility, water resistance and crack resistance, acid resistance, alkali resistance, high temperature resistance, ultraviolet ray resistance and ageing resistance, is simple to construct, short in construction period, pollution-free and convenient to maintain, and is mainly and widely applied to waterproof construction of kitchens, bathrooms and bathing rooms, and industrial and civil building impounding reservoirs in various fields, Basements and roofs of large-scale venues; subways, tunnels, bridges; the waterproof coiled material has unique effects on various parts with complex shapes, which are not easy to construct, such as longitudinal and transverse parts of a pipeline and the like, and particularly in kitchen and bathroom and waterproof construction.
The existing PVC water-based white paint has poor adhesive force on a hard PVC base material and is easy to cause the problem of yellowing of the hard PVC base material, and the aim of improving the weather resistance of the PVC water-based white paint cannot be fulfilled by selecting special polyurethane modified water-based acrylic emulsion so that the PVC water-based white paint is very unfavorable for people.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the hard PVC water-based white paint and the preparation method thereof, and the prepared hard PVC water-based white paint has better adhesive force on a hard PVC base material and can protect the hard PVC base material from yellowing.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a hard PVC water-based white paint comprises the following raw materials in percentage by weight: 50-55% of polyurethane modified water-based acrylic emulsion, 0.3-0.6% of defoaming agent, 0.2-0.5% of wetting agent, 0.3-0.5% of surfactant, 0.1-0.2% of ammonia neutralizing agent, 0.2-0.5% of flatting agent, 0-2% of matte powder, 2-5% of film-forming assistant, 2-10% of deionized water, 25-30% of water-based white slurry, 0.05-0.1% of in-tank bactericide, 1-5% of wax emulsion and 0.1-2% of thickening agent.
Preferably, the raw materials comprise the following components in percentage by weight: 54.28 percent of polyurethane modified water-based acrylic emulsion, 0.5 percent of defoaming agent, 0.3 percent of wetting agent, 0.4 percent of surfactant, 0.15 percent of ammonia neutralizer, 0.3 percent of flatting agent, 1 percent of matte powder, 3 percent of film forming additive, 8 percent of deionized water, 28 percent of water-based white slurry, 0.07 percent of in-tank bactericide, 3 percent of wax emulsion and 1 percent of thickening agent.
Preferably, the raw materials comprise the following components in percentage by weight: 54.25% of polyurethane modified water-based acrylic emulsion, 0.3% of defoaming agent, 0.2% of wetting agent, 0.3% of surfactant, 0.1% of ammonia neutralizing agent, 0.2% of flatting agent, 1.5% of matte powder, 2% of film-forming assistant, 10% of deionized water, 30% of water-based white slurry, 0.05% of in-tank bactericide, 1% of wax emulsion and 0.1% of thickening agent.
Preferably, the raw materials comprise the following components in percentage by weight: 51.65% of polyurethane modified water-based acrylic emulsion, 0.6% of defoaming agent, 0.5% of wetting agent, 0.5% of surfactant, 0.2% of ammonia neutralizer, 0.5% of flatting agent, 2% of matte powder, 5% of film-forming assistant, 2% of deionized water, 30% of water-based white slurry, 0.1% of in-tank bactericide, 5% of wax emulsion and 2% of thickening agent.
Preferably, the polyurethane modified aqueous acrylic emulsion is one or two of polyurethane modified aqueous acrylic emulsions provided by Opadry and DSM, and the defoaming agent is one or a combination of aqueous non-silicone fatty acid polymers, modified polyacrylic acid polymers, polyoxyethylene ethers or modified polysiloxanes provided by Pico, Digao or Pasteur.
Preferably, the wetting agent is one or the combination of polyether modified polysiloxane or polyether modified polydimethylsiloxane of Picker, and the surfactant is a high-efficiency ethoxylated nonionic super wetting agent which can effectively reduce the dynamic and static surface tension and generate little foam compared with the common surfactant.
Preferably, the ammonia neutralizer is AMP-95 of DOW, and the leveling agent is one or the combination of polyether or polyester modified polysiloxane.
Preferably, the matte powder is an organically treated silica matting powder, and the film-forming aid is one or a combination of DPnB dipropylene glycol butyl ether and DPM dipropylene glycol methyl ether.
Preferably, the in-tank bactericide is an environment-friendly in-tank bactericide of DOW or THOR, the wax emulsion is a high-density polyethylene wax emulsion of ultrafine particles, the wax emulsion has smooth hand feeling and good scratch resistance, and the thickener is a polyurethane thickener of the company Ming Ling.
The invention also discloses a preparation method of the hard PVC water-based white paint, which comprises the following steps:
s1, adding 50-55% of water-based acrylic emulsion into a paint preparation cylinder, gradually adding a defoaming agent, a wetting agent, a surfactant, an ammonia neutralizer, a leveling agent and matte powder at the rotation speed of 1000rpm of 800-;
s2, premixing the film-forming aid and deionized water, slowly adding at the rotating speed of 1000rpm under 800-;
s3, when in use, the prepared paint is uniformly stirred with a proper amount of water, and then the paint is kept still for five minutes and is coated on a workpiece.
(III) advantageous effects
The invention provides a hard PVC water-based white paint and a preparation method thereof. Compared with the prior art, the method has the following beneficial effects: the hard PVC water-based white paint and the preparation method thereof comprise the following raw materials by weight percent: 50-55% of polyurethane modified waterborne acrylic emulsion, 0.3-0.6% of defoaming agent, 0.2-0.5% of wetting agent, 0.3-0.5% of surfactant, 0.1-0.2% of ammonia neutralizer, 0.2-0.5% of flatting agent, 0-2% of matte powder, 2-5% of film-forming assistant, 2-10% of deionized water, 25-30% of waterborne white slurry, 0.05-0.1% of in-tank bactericide, 1-5% of wax emulsion and 0.1-2% of thickening agent.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the embodiment of the present invention provides three technical solutions: a hard PVC water-based white paint and a preparation method thereof specifically comprise the following embodiments:
example 1
A hard PVC water-based white paint comprises the following raw materials in percentage by weight: 54.28 percent of polyurethane modified water-based acrylic emulsion, 0.5 percent of defoaming agent, 0.3 percent of wetting agent, 0.4 percent of surfactant, 0.15 percent of ammonia neutralizer, 0.3 percent of leveling agent, 1 percent of matte powder, 3 percent of film forming additive, 8 percent of deionized water, 28 percent of water-based white slurry, 0.07 percent of in-tank bactericide, 3 percent of wax emulsion and 1 percent of thickening agent, wherein the polyurethane modified water-based acrylic emulsion is polyurethane modified water-based acrylic emulsion of Opadodi company, the defoaming agent is water-based non-silicone fatty acid polymer provided by Picker company, the wetting agent is polyether modified polysiloxane of Picker company, the surfactant is high-efficiency and ethoxylated nonionic super wetting agent, compared with the common surfactant, the polyurethane modified water-based acrylic emulsion can effectively reduce dynamic and static surface tension, generates little foam, the ammonia neutralizer is AMP-95 of DOW, the leveling agent is polyether, the matte powder is organic treated silicon dioxide matting powder, the film-forming assistant is DPnB dipropylene glycol butyl ether, the in-tank bactericide is DOW environment-friendly in-tank bactericide, the wax emulsion is ultrafine-particle high-density polyethylene wax emulsion, the wax emulsion has smooth hand feeling and good scratch resistance, and the thickener is polyurethane thickener of Mingling company.
The embodiment of the invention also discloses a preparation method of the hard PVC water-based white paint, which comprises the following steps:
s1, adding 54.28% of water-based acrylic emulsion into a paint preparing cylinder, gradually adding a defoaming agent, a wetting agent, a surfactant, an ammonia neutralizer, a flatting agent and matte powder at the rotating speed of 900rpm, and dispersing at a high speed at the rotating speed of 1300rpm until the fineness is less than or equal to 25 microns;
s2, premixing the film-forming aid and deionized water, slowly adding at the rotation speed of 900rpm, gradually adding the aqueous white slurry, the hand feeling aid, the in-tank bactericide and the wax emulsion, and finally adjusting the viscosity to 70KU by using the thickening agent;
s3, when in use, the prepared paint is uniformly stirred with a proper amount of water, and then the paint is kept still for five minutes and is coated on a workpiece.
Example 2
A hard PVC water-based white paint comprises the following raw materials in percentage by weight: 54.25 percent of polyurethane modified water-based acrylic emulsion, 0.3 percent of defoaming agent, 0.2 percent of wetting agent, 0.3 percent of surfactant, 0.1 percent of ammonia neutralizer, 0.2 percent of leveling agent, 1.5 percent of matte powder, 2 percent of film forming additive, 10 percent of deionized water, 30 percent of water-based white slurry, 0.05 percent of in-tank bactericide, 1 percent of wax emulsion and 0.1 percent of thickening agent, wherein the polyurethane modified water-based acrylic emulsion is one or two polyurethane modified water-based acrylic emulsions provided by DSM company, the defoaming agent is a modified polyacrylic polymer provided by Digao company, the wetting agent is polyether modified polydimethylsiloxane of Pic company, the surfactant is an efficient and ethoxylated nonionic super-wetting agent, compared with the common surfactant, the polyurethane modified water-based acrylic emulsion can effectively reduce dynamic and static surface tension and generate extremely little foam, the ammonia neutralizing agent is AMP-95 of DOW, the leveling agent is polyether, the matte powder is organic treated silicon dioxide matting powder, the film forming assistant is DPM dipropylene glycol methyl ether, the in-tank bactericide is DOW environment-friendly in-tank bactericide, the wax emulsion is ultrafine-particle high-density polyethylene wax emulsion, the wax emulsion has smooth hand feeling and good scratch resistance, and the thickener is polyurethane thickener of Mingling company.
The embodiment of the invention also discloses a preparation method of the hard PVC water-based white paint, which comprises the following steps:
s1, adding 54.25% of water-based acrylic emulsion into a paint preparing cylinder, gradually adding a defoaming agent, a wetting agent, a surfactant, an ammonia neutralizer, a flatting agent and matte powder at the rotating speed of 1000rpm, and dispersing at high speed at the rotating speed of 1500rpm until the fineness is less than or equal to 25 microns;
s2, premixing the film-forming aid and deionized water, slowly adding at the rotating speed of 1000rpm, gradually adding the aqueous white slurry, the hand feeling aid, the in-tank bactericide and the wax emulsion, and finally adjusting the viscosity to 75KU by using the thickening agent;
s3, when in use, the prepared paint is uniformly stirred with a proper amount of water, and then the paint is kept still for five minutes and is coated on a workpiece.
Example 3
A hard PVC water-based white paint comprises the following raw materials in percentage by weight: 51.65 percent of polyurethane modified water-based acrylic emulsion, 0.6 percent of defoaming agent, 0.5 percent of wetting agent, 0.5 percent of surfactant, 0.2 percent of ammonia neutralizer, 0.5 percent of leveling agent, 2 percent of matte powder, 5 percent of film forming additive, 2 percent of deionized water, 30 percent of water-based white slurry, 0.1 percent of in-tank bactericide, 5 percent of wax emulsion and 2 percent of thickening agent, wherein the polyurethane modified water-based acrylic emulsion is polyurethane modified water-based acrylic emulsion of Opposite company, the defoaming agent is polyoxyethylene ether provided by Basff, the wetting agent is polyether modified polydimethylsiloxane of Pic company, the surfactant is high-efficiency and ethoxylated nonionic super-wetting agent, compared with the common surfactant, the polyurethane modified water-based acrylic emulsion can effectively reduce dynamic and static surface tension and generate little foam, the ammonia neutralizer is AMP-95 of DOW, the leveling agent is polyester modified polysiloxane, the matte powder is organically treated silicon dioxide matting powder, the film-forming assistant is DPnB dipropylene glycol butyl ether, the in-tank bactericide is THOR which is an environment-friendly in-tank bactericide, the wax emulsion is ultrafine-particle high-density polyethylene wax emulsion, the wax emulsion has smooth hand feeling and good scratch resistance, and the thickener is polyurethane thickener of Mingling company.
The embodiment of the invention also discloses a preparation method of the hard PVC water-based white paint, which comprises the following steps:
s1, adding 51.65% of water-based acrylic emulsion into a paint preparing cylinder, gradually adding a defoaming agent, a wetting agent, a surfactant, an ammonia neutralizer, a flatting agent and matte powder at the rotating speed of 1000rpm, and dispersing at high speed at the rotating speed of 1500rpm until the fineness is less than or equal to 25 microns;
s2, premixing the film-forming aid and deionized water, slowly adding at the rotating speed of 1000rpm, gradually adding the aqueous white slurry, the hand feeling aid, the in-tank bactericide and the wax emulsion, and finally adjusting the viscosity to 75KU by using the thickening agent;
s3, when in use, the prepared paint is uniformly stirred with a proper amount of water, and then the paint is kept still for five minutes and is coated on a workpiece.
In conclusion, the invention can realize that the adhesion force on hard PVC can be well achieved by selecting the special polyurethane modified water-based acrylic emulsion, and meanwhile, in a weather resistance test, the delta E is less than or equal to 0.5 within QUA 360 hours.
And those not described in detail in this specification are well within the skill of those in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A hard PVC water-based white paint is characterized in that: the raw materials comprise the following components in percentage by weight: 50-55% of polyurethane modified water-based acrylic emulsion, 0.3-0.6% of defoaming agent, 0.2-0.5% of wetting agent, 0.3-0.5% of surfactant, 0.1-0.2% of ammonia neutralizing agent, 0.2-0.5% of flatting agent, 0-2% of matte powder, 2-5% of film-forming assistant, 2-10% of deionized water, 25-30% of water-based white slurry, 0.05-0.1% of in-tank bactericide, 1-5% of wax emulsion and 0.1-2% of thickening agent.
2. The rigid PVC waterborne white coating of claim 1, wherein: the raw materials comprise the following components in percentage by weight: 54.28 percent of polyurethane modified water-based acrylic emulsion, 0.5 percent of defoaming agent, 0.3 percent of wetting agent, 0.4 percent of surfactant, 0.15 percent of ammonia neutralizer, 0.3 percent of flatting agent, 1 percent of matte powder, 3 percent of film forming additive, 8 percent of deionized water, 28 percent of water-based white slurry, 0.07 percent of in-tank bactericide, 3 percent of wax emulsion and 1 percent of thickening agent.
3. The rigid PVC waterborne white coating of claim 1, wherein: the raw materials comprise the following components in percentage by weight: 54.25% of polyurethane modified water-based acrylic emulsion, 0.3% of defoaming agent, 0.2% of wetting agent, 0.3% of surfactant, 0.1% of ammonia neutralizing agent, 0.2% of flatting agent, 1.5% of matte powder, 2% of film-forming assistant, 10% of deionized water, 30% of water-based white slurry, 0.05% of in-tank bactericide, 1% of wax emulsion and 0.1% of thickening agent.
4. The rigid PVC waterborne white coating of claim 1, wherein: the raw materials comprise the following components in percentage by weight: 51.65% of polyurethane modified water-based acrylic emulsion, 0.6% of defoaming agent, 0.5% of wetting agent, 0.5% of surfactant, 0.2% of ammonia neutralizer, 0.5% of flatting agent, 2% of matte powder, 5% of film-forming assistant, 2% of deionized water, 30% of water-based white slurry, 0.1% of in-tank bactericide, 5% of wax emulsion and 2% of thickening agent.
5. The rigid PVC waterborne white coating according to any one of claims 1 to 4, wherein: the polyurethane modified water-based acrylic emulsion is one or two of polyurethane modified water-based acrylic emulsions provided by Opadry and DSM, and the defoaming agent is one or the combination of water-based non-silicone fatty acid polymers, modified polyacrylic acid polymers, polyoxyethylene ether or modified polysiloxane provided by Pico, Digao or Pasteur.
6. The rigid PVC waterborne white coating according to any one of claims 1 to 4, wherein: the wetting agent is one or the combination of polyether modified polysiloxane or polyether modified polydimethylsiloxane of Picker company.
7. The rigid PVC waterborne white coating according to any one of claims 1 to 4, wherein: the ammonia neutralizer is AMP-95 of DOW, and the flatting agent is one or the combination of polyether or polyester modified polysiloxane.
8. The rigid PVC waterborne white coating according to any one of claims 1 to 4, wherein: the matte powder is silicon dioxide matting powder subjected to organic treatment, and the film-forming assistant is one or a combination of DPnB dipropylene glycol butyl ether or DPM dipropylene glycol methyl ether.
9. The rigid PVC waterborne white coating according to any one of claims 1 to 4, wherein: the in-tank bactericide is an environment-friendly in-tank bactericide of DOW or THOR, the wax emulsion is a high-density polyethylene wax emulsion of ultrafine particles, and the thickener is a polyurethane thickener of the company Ming Ling.
10. A method for preparing the rigid PVC waterborne white coating of any one of claims 1 to 4, characterized in that: the method specifically comprises the following steps:
s1, adding 50-55% of water-based acrylic emulsion into a paint preparation cylinder, gradually adding a defoaming agent, a wetting agent, a surfactant, an ammonia neutralizer, a leveling agent and matte powder at the rotation speed of 1000rpm of 800-;
s2, premixing the film-forming aid and deionized water, slowly adding at the rotating speed of 1000rpm under 800-;
s3, when in use, the prepared paint is uniformly stirred with a proper amount of water, and then the paint is kept still for five minutes and is coated on a workpiece.
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Cited By (1)
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CN114634764A (en) * | 2022-04-11 | 2022-06-17 | 合肥市丰迪厚德新材料有限公司 | Powder-free water-based coating for PVC gloves and preparation method thereof |
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CN109321030A (en) * | 2018-11-07 | 2019-02-12 | 顾洪杰 | Water-based plastic inner printing ink and water-based plastic table printing ink |
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CN112358779A (en) * | 2020-09-28 | 2021-02-12 | 上海展辰涂料有限公司 | High-adhesion dip-coating water-based toning finish paint and preparation method thereof |
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CN107641413A (en) * | 2017-10-26 | 2018-01-30 | 宁波甬波新材料科技有限公司 | A kind of water-based plastic paint for nylon PA glass modified plastics and preparation method thereof |
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CN109627871A (en) * | 2018-12-18 | 2019-04-16 | 广州帝采环保科技有限公司 | Environmentally friendly high-performance water-based plastic cement industrial coating of one kind and preparation method thereof |
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Application publication date: 20211008 |