CN113250005A - High-light-transmittance paint for printing synthetic paper coating, and preparation and coating methods of paint - Google Patents
High-light-transmittance paint for printing synthetic paper coating, and preparation and coating methods of paint Download PDFInfo
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- CN113250005A CN113250005A CN202110592351.6A CN202110592351A CN113250005A CN 113250005 A CN113250005 A CN 113250005A CN 202110592351 A CN202110592351 A CN 202110592351A CN 113250005 A CN113250005 A CN 113250005A
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- 238000000576 coating method Methods 0.000 title claims abstract description 94
- 239000011248 coating agent Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000002834 transmittance Methods 0.000 title claims description 10
- 239000003973 paint Substances 0.000 title claims description 6
- 239000000839 emulsion Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 26
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 26
- 239000004814 polyurethane Substances 0.000 claims abstract description 23
- 229920002635 polyurethane Polymers 0.000 claims abstract description 23
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 19
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 238000010790 dilution Methods 0.000 claims abstract description 9
- 239000012895 dilution Substances 0.000 claims abstract description 9
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 239000003755 preservative agent Substances 0.000 claims abstract description 4
- 230000002335 preservative effect Effects 0.000 claims abstract description 4
- 239000008399 tap water Substances 0.000 claims abstract description 4
- 235000020679 tap water Nutrition 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 15
- 238000007865 diluting Methods 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- -1 polysiloxane Polymers 0.000 claims description 7
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 239000005056 polyisocyanate Substances 0.000 claims description 6
- 229920001228 polyisocyanate Polymers 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 5
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 5
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 229920005862 polyol Polymers 0.000 claims description 4
- 150000003077 polyols Chemical class 0.000 claims description 4
- 229920002873 Polyethylenimine Polymers 0.000 claims description 3
- 101001106411 Toxoplasma gondii Rhoptry neck protein 4 Proteins 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 150000003926 acrylamides Chemical class 0.000 claims description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 claims 1
- 239000011247 coating layer Substances 0.000 abstract description 5
- 238000003860 storage Methods 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 19
- 150000002009 diols Chemical class 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- YRTNMMLRBJMGJJ-UHFFFAOYSA-N 2,2-dimethylpropane-1,3-diol;hexanedioic acid Chemical compound OCC(C)(C)CO.OC(=O)CCCCC(O)=O YRTNMMLRBJMGJJ-UHFFFAOYSA-N 0.000 description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 239000011104 metalized film Substances 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 229920005906 polyester polyol Polymers 0.000 description 2
- 229920000921 polyethylene adipate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 150000004072 triols Chemical class 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- YPHQUSNPXDGUHL-UHFFFAOYSA-N n-methylprop-2-enamide Chemical class CNC(=O)C=C YPHQUSNPXDGUHL-UHFFFAOYSA-N 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/28—Polyesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/12—Defoamers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
Abstract
The invention discloses a high-light-transmission coating for printing a synthetic paper coating, and a preparation method and a coating method of the coating, wherein the coating comprises the following components in parts by weight (dry weight): 70-95 parts of acrylic resin, 3-28 parts of polyurethane, 0-1 part of preservative, 0.1-1 part of defoaming agent and 0-7 parts of cross-linking agent, wherein a proper amount of water for dilution is required to be added in the preparation process of the coating, the water for dilution comprises deionized water or tap water, and the weight part of the water for dilution is 30-400 parts. The high-light-transmission coating for the printing synthetic paper coating adopts high-Tg acrylic emulsion and water-based polyurethane as main components, the high-Tg acrylic emulsion ensures that the coating layers are not anti-adhered under the storage and transportation conditions of 45-60 ℃, the polyurethane ensures that the coating has high light transmission and ink affinity, and the bonding property of the polyurethane can promote the combination of the coating and the base film, so that the coating of the coating not only resists low temperature and high temperature, but also the printing ink is not easy to fall off and is convenient to transport.
Description
Technical Field
The invention relates to a high-light-transmittance coating for printing a synthetic paper coating, and a preparation method and a coating method of the coating.
Background
When synthetic paper is used as a packaging material, a transparent film allows consumers to see the contents, and therefore, it is required to coat the synthetic paper with a colorless coating layer having high light transmittance. Opaque films sometimes need to maintain the delicate luster of the base film, and also require coatings to have colorless high light transmittance; the main components of the coating are resin emulsion and a small amount of various additives, the emulsion is usually acrylic emulsion, the emulsion has good absorptivity to printing ink, most of the emulsion can be well combined through own polarity on the surface of films with strong polarity such as PET, PVC and the like, the adhesive force is strong, PP and PE films are the most common synthetic paper base materials and are non-polar materials, most of acrylic emulsion has no adhesiveness to the PP and PVC films, and film manufacturers can carry out corona treatment on the surface to enable the original non-polar surface to generate polar groups such as hydroxyl, carboxyl and the like, so that the adhesive force of the acrylic emulsion can be improved on the surface, but the surface is often not enough.
In order to ensure high light transmittance of a traditional paint coating, an acrylic emulsion with low Tg is generally used, although the low Tg is favorable for the adhesion of printing ink, the lower the Tg is, the stronger the viscosity of the coating is, the coating is anti-sticky at a higher temperature, the use is extremely unstable, and particularly, the conditions of package adhesion and pattern blurring easily occur in the storage and transportation process, so that the light transmittance of the coating is also influenced.
Disclosure of Invention
The invention aims to provide a high-light-transmission coating for printing synthetic paper, a preparation method and a coating method of the coating, and aims to solve the problems that the coating proposed in the background art generally uses acrylic emulsion with low Tg in order to ensure high light transmission, the lower Tg is favorable for the adhesion of printing ink, but the lower Tg is higher in the viscosity of the coating, the coating is anti-sticky at higher temperature and extremely unstable in use, and the conditions of package adhesion and pattern blurring are easy to occur particularly in the storage and transportation process, so that the light transmission of the coating is also influenced.
In order to achieve the purpose, the invention provides the following technical scheme: a high-light-transmission coating for printing synthetic paper coating, a preparation method and a coating method of the coating comprise the following components in parts by weight (dry weight): 70-95 parts of acrylic resin, 3-28 parts of polyurethane, 0-1 part of preservative, 0.1-1 part of defoaming agent and 0-7 parts of cross-linking agent.
Preferably, a proper amount of diluting water is also required to be added in the preparation process of the coating, wherein the diluting water comprises deionized water or tap water, and the weight part of the diluting water is 30-400 parts.
Preferably, the polyurethane is polymerized by polyisocyanate, dihydric or trihydric alcohol and carboxyl-containing dihydric or trihydric alcohol.
Preferably, the polyisocyanate includes, but is not limited to, HDI, XDI, IPDI, the diol or triol includes, but is not limited to, polyethylene glycol, polypropylene glycol, polyethylene adipate glycol, 1,3, 5-tripentanol, neopentyl glycol, and the carboxy-containing diol or triol includes, but is not limited to, dimethylolpropionic acid.
Preferably, the acrylic resin is acrylic resin emulsion in the form of emulsion, the acrylic resin emulsion comprises one or more of styrene-acrylic emulsion, acrylic emulsion and acrylic emulsion, and the Tg value of the acrylic resin emulsion is 35-100 ℃.
Preferably, the antifoaming agent includes, but is not limited to, silicone type antifoaming agents, polyether polyol type antifoaming agents.
Preferably, the crosslinking agent comprises one or more of polyaziridines, polycarbodiimides, and (meth) acrylamides.
A preparation and coating method of a high-light-transmission coating for printing synthetic paper coating comprises the following steps:
step (A), batching; 100 parts by weight of water for dilution, 18 parts by weight (dry weight) of pure acrylic resin (Tg65 ℃ C.), 72 parts by weight (dry weight) of acrylic resin for styrene-acrylic (Tg45 ℃ C.), 8 parts by weight (dry weight) of polyurethane, 0.1 part by weight of a defoaming agent, 1.9 parts by weight of a crosslinking agent and 100 parts by weight of water for dilution;
step (B), stirring and uniformly mixing; adding the weighed acrylic resin emulsion in the step (A) into 100 parts by weight of diluting water under the stirring state, and slowly adding 1.9 parts by weight of cross-linking agent and 0.1 part by weight of defoaming agent after uniformly stirring until uniformly stirring;
step (C), filtering; pumping the coating into a filter through a pneumatic pump for filtering;
step (D), quantitative coating; the filtered coating enters a material groove, and a reticulate pattern roller and a scraper are used for quantitative coating;
step (E), drying; drying the synthetic paper base film coated with the coating through a wind box;
step (F), rolling and finishing; and rolling the dried synthetic paper base film with the coating.
Preferably, the stirring intensity in the step (B) is not lower than 500RPM
Preferably, the filter in step (C) is a 300-mesh filter, the coating amount in step (D) is 0.5-2.5 g/square meter, the wind box setting temperature in step (E) is 70-110 ℃, and the synthetic paper base film used comprises but is not limited to PET, PVC, metallized film, corona PP and PE film.
Compared with the prior art, the invention has the advantages and benefits that:
the coating of the invention has the characteristics of no color and high light transmission, and when the synthetic paper is used as a packaging material, the transparent film can enable consumers to see the contents clearly; the transparent coating can also ensure that printing ink is not easy to fall off under the condition of keeping the exquisite appearance of the base film; the coating adopts high Tg acrylic emulsion and water-based polyurethane as main components, the high Tg acrylic emulsion ensures that the coating layer is not anti-adhered under the storage and transportation conditions of 45-60 ℃, the polyurethane ensures that the coating layer has high light transmittance and ink affinity, and the bonding property of the polyurethane can promote the combination of the coating layer and a base film, so that the coating of the coating not only resists low temperature and high temperature, but also is not easy to fall off in printing ink and is convenient to transport.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
The invention provides a technical scheme that: a high-light-transmission coating for printing synthetic paper coating, a preparation method and a coating method of the coating comprise the following components in parts by weight (dry weight): 70-95 parts of acrylic resin, 3-28 parts of polyurethane, 0-1 part of preservative, 0.1-1 part of defoaming agent and 0-7 parts of cross-linking agent.
Furthermore, a proper amount of diluting water is required to be added in the preparation process of the coating, wherein the diluting water comprises deionized water or tap water, and the weight part of the diluting water is 30-400 parts.
Furthermore, the polyurethane is polymerized by polyisocyanate, dihydric or trihydric alcohol and carboxyl-containing dihydric or trihydric alcohol, and the polyurethane plays roles of enhancing viscosity, enhancing ink affinity and reducing coating striations in the whole formula; polyisocyanates include, but are not limited to, HDI, XDI, IPDI, said diols or triols include, but are not limited to, polyethylene glycol, polypropylene glycol, polyethylene adipate glycol, 1,3, 5-tripentanol, neopentyl glycol, said carboxyl group containing diols or triols include, but are not limited to, dimethylolpropionic acid; aromatic isocyanates can also be used, but since aromatic isocyanates have a strong yellowing, they are generally not used, and the synthetic polyurethanes in the industry are all guaranteed to have isocyanate groups: the alcoholic hydroxyl group is about 1:1, the proportion is fixed as long as the raw materials are fixed, the proportion follows the types of the raw materials, the proportion is preferably synthesized by polyester polyol and IPDI, and the common proportion by weight is IPDI: poly (neopentyl glycol adipate): dimethylolpropionic acid =8:4:1, the overall properties are relatively good, and poly neopentyl glycol adipate belongs to the abbreviation of the polymer, is a polymer with a terminated hydroxyl group, and belongs to polyester polyol; the polyurethane ensures that the coating has high light transmittance and ink affinity, and the bonding property of the polyurethane can promote the combination of the coating and the base film. The polyurethane has the characteristics that the polyurethane has excellent toughness, wide glass transition temperature range, low temperature resistance and high temperature resistance due to microphase separation in the structure; the carbamate in the structure has higher polarity, and the adhesive force to a polar base material can be improved; the terminal isocyanate group has higher reactivity to hydroxyl, and the H on the amido group also has certain reactivity and can generate chemical bonds with carboxyl, epoxy and other groups; the carboxylic acid groups in the structure provide some water solubility, which is the basis for being able to make emulsions, while providing a reactive group that reacts with the crosslinking agent; overall, the addition of the polyurethane improves the tack and adhesion of the acrylic resin.
Further, the acrylic resin is an acrylic resin emulsion in the form of emulsion, the acrylic resin emulsion comprises one or more of styrene-acrylic emulsion, acrylic emulsion and acrylic emulsion, the Tg value of the acrylic resin emulsion is 35-100 ℃, the high Tg acrylic emulsion ensures that anti-sticking does not occur between coatings under the storage and transportation conditions of 45-60 ℃, the Tg of the emulsion is various, the Tg of the styrene-acrylic emulsion is from 0 ℃ to 110 ℃, such as target Tg60, the Tg80 is matched with the Tg40 to be about 1:1, but the emulsion with the Tg60 is not added with other emulsions; for example, an emulsion having a Tg of about 58.8 ℃ can be obtained by mixing acrylic emulsions having a Tg of 80 ℃ in equal proportions with acrylic emulsions having a Tg of 40 ℃.
Further, the defoaming agent comprises but is not limited to polysiloxane defoaming agents and polyether polyol defoaming agents, polyether siloxane commonly used in the industry is cheap and is easy to cause abnormal fish eyes, polyether polyol is expensive and has a poor effect, but the coating does not have problems, polyether siloxane commonly used in the industry is cheap and alkyne diol has a better effect.
Further, the crosslinking agent comprises one or more of polyaziridines, polycarbodiimides and (methyl) acrylamides, and can effectively improve the crosslinking degree, water resistance, solvent resistance and anti-tack property.
A preparation and coating method of a high-light-transmission coating for printing synthetic paper coating comprises the following steps:
step (A), batching; 100 parts by weight of water for dilution, 18 parts by weight (dry weight) of pure acrylic resin (Tg65 ℃ C.), 72 parts by weight (dry weight) of acrylic resin for styrene-acrylic (Tg45 ℃ C.), 8 parts by weight (dry weight) of polyurethane, 0.1 part by weight of a defoaming agent, 1.9 parts by weight of a crosslinking agent and 100 parts by weight of water for dilution;
step (B), stirring and uniformly mixing; adding the weighed acrylic resin emulsion in the step (A) into 100 parts by weight of diluting water under the stirring state, and slowly adding 1.9 parts by weight of cross-linking agent and 0.1 part by weight of defoaming agent after uniformly stirring until uniformly stirring;
step (C), filtering; pumping the coating into a filter through a pneumatic pump for filtering;
step (D), quantitative coating; the filtered coating enters a material groove, and a reticulate pattern roller and a scraper are used for quantitative coating;
step (E), drying; drying the synthetic paper base film coated with the coating through a wind box;
step (F), rolling and finishing; and rolling the dried synthetic paper base film with the coating.
Further, the stirring intensity in the step (B) is not lower than 500 RPM.
Further, the filter in the step (C) is a 300-mesh filter, the coating amount in the step (D) is 0.5-2.5 g/square meter, the setting temperature of the wind box in the step (E) is 70-110 ℃, and the used synthetic paper base films comprise but are not limited to PET, PVC, metallized films, corona PP and PE films.
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. The high-light-transmittance paint for printing the synthetic paper coating is characterized in that: comprises the following components in parts by weight (dry weight): 70-95 parts of acrylic resin, 3-28 parts of polyurethane, 0-1 part of preservative, 0.1-1 part of defoaming agent and 0-7 parts of cross-linking agent.
2. The high light transmission coating for printing synthetic paper according to claim 1, characterized in that: in the preparation process of the coating, a proper amount of diluting water is required to be added, wherein the diluting water comprises deionized water or tap water, and the weight part of the diluting water is 30-400 parts.
3. The high light transmission coating for printing synthetic paper according to claim 1, characterized in that: the polyurethane is polymerized by polyisocyanate, dihydric or trihydric alcohol and carboxyl-containing dihydric or trihydric alcohol.
4. The high light transmission coating for printing synthetic paper according to claim 3, characterized in that: the polyisocyanate comprises one of HDI, XDI and IPDI, the dihydric alcohol or the trihydric alcohol comprises polyethylene glycol, polypropylene glycol, polyethylene glycol adipate glycol, 1,3, 5-tripentanol and neopentyl glycol, and the carboxyl-containing dihydric or trihydric alcohol comprises dimethylolpropionic acid.
5. The high light transmission coating for printing synthetic paper according to claim 1, characterized in that: the acrylic resin is an acrylic resin emulsion in the form of emulsion, the acrylic resin emulsion comprises one or more of styrene-acrylic emulsion, acrylic emulsion and acrylic emulsion, and the Tg value of the acrylic resin emulsion is 35-100 ℃.
6. The high light transmission coating for printing synthetic paper according to claim 1, characterized in that: the defoaming agent comprises polysiloxane defoaming agent and polyether polyol defoaming agent.
7. The high light transmission coating for printing synthetic paper according to claim 1, characterized in that: the crosslinking agent comprises one or more of polyaziridines, polycarbodiimides, and (meth) acrylamides.
8. The method for preparing and coating the high-transparency coating for printing the synthetic paper is characterized by comprising the following steps of: the method comprises the following steps:
step (A), batching; 100 parts by weight of water for dilution, 18 parts by weight (dry weight) of pure acrylic resin (Tg65 ℃ C.), 72 parts by weight (dry weight) of acrylic resin for styrene-acrylic (Tg45 ℃ C.), 8 parts by weight (dry weight) of polyurethane, 0.1 part by weight of a defoaming agent, 1.9 parts by weight of a crosslinking agent and 100 parts by weight of water for dilution;
step (B), stirring and uniformly mixing; adding the weighed acrylic resin emulsion in the step (A) into 100 parts by weight of diluting water under the stirring state, and slowly adding 1.9 parts by weight of cross-linking agent and 0.1 part by weight of defoaming agent after uniformly stirring until uniformly stirring;
step (C), filtering; pumping the coating into a filter through a pneumatic pump for filtering;
step (D), quantitative coating; the filtered coating enters a material groove, and a reticulate pattern roller and a scraper are used for quantitative coating;
step (E), drying; drying the synthetic paper base film coated with the coating through a wind box;
step (F), rolling and finishing; and rolling the dried synthetic paper base film with the coating.
9. The method for preparing and coating the high-transparency coating for the printing synthetic paper according to claim 8, wherein the method comprises the following steps: the stirring intensity in the step (B) is not lower than 500 RPM.
10. The method for preparing and coating the high-transparency coating for the printing synthetic paper according to claim 8, wherein the method comprises the following steps: in the step (C), a 300-mesh filter is selected, the coating amount in the step (D) is 0.5-2.5 g/square meter, the setting temperature of the wind box in the step (E) is 70-110 ℃, and the used synthetic paper base films comprise but are not limited to PET, PVC, metal-plated films, corona-treated PP and PE films.
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