阅读说明：本技术 一种水性高光涂料及其制备方法 (Water-based high-gloss paint and preparation method thereof ) 是由 郑少琴 谢进标 于 2021-01-30 设计创作，主要内容包括：一种水性高光涂料,其特征在于由下述重量配比的原料制成：水40－60%,异氰酸酯8-40%,扩链树脂5-15%,交联树脂5-10%,活性聚硅氧烷1-10%,磺酸盐亲水扩链剂2-5%,后扩链剂0.5-3%,后交联剂0.02-0.2%,前催化剂0.01-0.1%,后催化剂0.02-0.2%,羟基丙烯酸酯0.5-5%,甲基丙烯酸甲酯2-20%,苯乙烯2-10%,乳化剂0.1-0.4%,引发剂0.1-0.4%,增稠剂0.01-0.05%,流平剂0.05-0.2%,消泡剂0.1-0.3%,防腐剂0.1-0.3%。本发明还提供上述水性高光涂料的一种制备方法。本发明的水性高光涂料用于复合转移工艺生产高光纸,纸张表面光泽度高,耐热性好,耐折性好,涂层与纸张附着力好,与模压膜有良好的剥离性,超低VOC含量,符合节能环保和安全卫生要求。(The water-based high-gloss paint is characterized by being prepared from the following raw materials in parts by weight: 40-60% of water, 8-40% of isocyanate, 5-15% of chain-extending resin, 5-10% of cross-linked resin, 1-10% of active polysiloxane, 2-5% of sulfonate hydrophilic chain extender, 0.5-3% of rear chain extender, 0.02-0.2% of rear cross-linking agent, 0.01-0.1% of procatalyst, 0.02-0.2% of rear catalyst, 0.5-5% of hydroxyl acrylate, 2-20% of methyl methacrylate, 2-10% of styrene, 0.1-0.4% of emulsifier, 0.1-0.4% of initiator, 0.01-0.05% of thickener, 0.05-0.2% of flatting agent, 0.1-0.3% of defoaming agent and 0.1-0.3% of preservative. The invention also provides a preparation method of the water-based high-gloss paint. The water-based high-gloss coating is used for producing high-gloss paper by a composite transfer process, has high surface gloss of the paper, good heat resistance, good folding resistance, good adhesion of a coating and the paper, good stripping property with a molded film and ultralow VOC content, and meets the requirements of energy conservation, environmental protection, safety and sanitation.)

1. The water-based high-gloss paint is characterized by being prepared from the following raw materials in parts by weight: 40-60% of water, 8-40% of isocyanate, 5-15% of chain-extending resin, 5-10% of cross-linked resin, 1-10% of active polysiloxane, 2-5% of sulfonate hydrophilic chain extender, 0.5-3% of rear chain extender, 0.02-0.2% of rear cross-linking agent, 0.01-0.1% of procatalyst, 0.02-0.2% of rear catalyst, 0.5-5% of hydroxyl acrylate, 2-20% of methyl methacrylate, 2-10% of styrene, 0.1-0.4% of emulsifier, 0.1-0.4% of initiator, 0.01-0.05% of thickener, 0.05-0.2% of flatting agent, 0.1-0.3% of defoaming agent and 0.1-0.3% of preservative.

2. The aqueous high gloss coating of claim 1, wherein: the isocyanate is one or a combination of more of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, 4' -dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and HDI trimer.

3. The aqueous high gloss coating of claim 1, wherein: the chain extension resin is polyether diamine, polyether diol, polyester diol or polyaspartic acid ester.

4. The aqueous high gloss coating of claim 1, wherein: the crosslinking resin is a polyether polyol having a molecular weight of 200-1000.

5. The aqueous high gloss coating of claim 1, wherein: the active polysiloxane is aminopropyl terminated polydimethylsiloxane or alcohol hydroxyl terminated dimethyl siloxane, and the molecular weight of the active polysiloxane is 500-4000.

6. The aqueous high gloss coating of claim 1, wherein: the sulfonate hydrophilic chain extender is an aqueous solution of ethylenediamine ethanesulfonic acid sodium salt or 1, 2-dihydroxy-3-propanesulfonic acid sodium salt, and the weight percentage concentration of the sulfonate hydrophilic chain extender is 40-60%.

7. The aqueous high gloss coating of claim 1, wherein: the rear chain extender is isophorone diamine or ethylene diamine, and the rear cross-linking agent is diethylenetriamine.

8. The aqueous high gloss coating of claim 1, wherein: the pre-catalyst is dibutyltin dilaurate, stannous octoate, potassium isooctanoate or bismuth catalyst, and the post-catalyst is triethanolamine, dimethylethanolamine or dimorpholinyl diethyl ether.

9. The aqueous high gloss coating of claim 1, wherein: the hydroxy acrylic ester is hydroxyethyl methacrylate or hydroxyethyl acrylate;

the emulsifier is one or the combination of alkyl alcohol ether sodium sulfate and nonylphenol polyoxyethylene ether ammonium sulfate;

the initiator is potassium persulfate, sodium persulfate, ammonium persulfate or benzoyl peroxide;

the thickening agent is a polyurethane thickening agent;

the leveling agent is polyether siloxane copolymer;

the defoaming agent is a polyether defoaming agent;

the preservative is an isothiazolinone preservative.

10. The method for preparing the water-based high-gloss paint according to claim 1, which is characterized by comprising the following steps:

(1) the following raw materials are prepared by weight: 40-60% of water, 8-40% of isocyanate, 5-15% of chain-extending resin, 5-10% of cross-linking resin, 1-10% of active polysiloxane, 2-5% of sulfonate hydrophilic chain extender, 0.5-3% of rear chain extender, 0.02-0.2% of rear cross-linking agent, 0.01-0.1% of procatalyst, 0.02-0.2% of rear catalyst, 0.5-5% of hydroxyl acrylate, 2-20% of methyl methacrylate, 2-10% of styrene, 0.1-0.4% of emulsifier, 0.1-0.4% of initiator, 0.01-0.05% of thickener, 0.05-0.2% of flatting agent, 0.1-0.3% of defoaming agent and 0.1-0.3% of preservative;

the water is divided into four parts: the first part of water accounts for 10-15% of the total water amount, and is used for dissolving the post-catalyst to obtain a post-catalyst aqueous solution for later use; the second part of water accounts for 10-15% of the total water amount, and is used for dissolving the post-chain extender and the post-crosslinking agent to obtain a post-chain extender and post-crosslinking agent aqueous solution for later use; the third part of water accounts for 10-15% of the total water amount and is used for dissolving the initiator to obtain an initiator aqueous solution for later use; the remaining water was used as a fourth water portion for pre-emulsification;

(2) respectively adding the chain-extending resin and the cross-linking resin into a water removal reaction kettle with a stirrer and a vacuum water removal system to remove water contained in the chain-extending resin and the cross-linking resin;

(3) adding the chain-extended resin with water removed into a first polymerization reaction kettle with a stirrer, dropwise adding isocyanate while stirring, heating to 70-85 ℃, and reacting for 0.5-1.5 hours; then adding the dehydrated crosslinking resin, and reacting for 1-3 hours at 70-85 ℃;

(4) adjusting the temperature in the first polymerization reaction kettle to 55-70 ℃, adding active polysiloxane, and reacting for 0.5-2 hours at 65-70 ℃;

(5) regulating the temperature in the first polymerization reaction kettle to 55-70 ℃, adding hydroxyl acrylate and a procatalyst, heating to 70-80 ℃, and reacting for 1-3 hours;

(6) adjusting the temperature in the first polymerization reaction kettle to 55-65 ℃, and then adding methyl methacrylate and styrene; then cooling to below 40 ℃, dropwise adding the sulfonate hydrophilic chain extender within 30 minutes, and stirring for 5-30 min;

(7) setting the stirring speed of the first polymerization reaction kettle to be 1000-3000rmp, adding fourth part of water into the first polymerization reaction kettle within 10-40min, emulsifying for 5-30min, dropwise adding the post-chain extender and post-crosslinking agent aqueous solution, and continuously stirring for 5-30 min; then reducing the stirring speed of the first polymerization reaction kettle to 50-300rmp, adding the post-catalyst aqueous solution into the first polymerization reaction kettle, and stirring for 10-30min to obtain a pre-emulsion;

(8) adding 10-30% of pre-emulsion into a second polymerization reaction kettle with a reflux device, adding an emulsifier, adding 10-30% of initiator aqueous solution, stirring and heating until reflux is generated in a reflux pipe, simultaneously dropwise adding the rest of initiator aqueous solution and the rest of pre-emulsion, and finishing dropwise adding within 3 hours; heating to 80-90 deg.C after dripping, maintaining the temperature for 20-60min, and cooling to 35-40 deg.C;

(9) and adding a defoaming agent, a thickening agent, a flatting agent and a preservative into the second polymerization reaction kettle, and uniformly stirring to obtain the water-based high-gloss paint.

Technical Field

The invention relates to a coating composition, and particularly relates to a water-based high-gloss coating and a preparation method thereof.

Background

The aircraft glass cardboard is also called as cast-coated paper, and the traditional processing method is that the base paper coated with the coating is stuck and pressed on the surface of a heated chrome-plated drying cylinder with high polishing and mirror luster, and then the processed paper is dried and stripped. Because the paper surface is smooth and bright like glass, the paper is also called as glass paperboard and is commonly called as high gloss paper. The high-gloss paper as a high-end packaging material is widely applied to the external packaging of high-end products such as cosmetics, medicines, health products, high-grade cigarettes and wines, and has very large market demand potential.

At present, the high-gloss paper produced at home and abroad has the traditional cast coating process and the composite transfer process.

The traditional cast coating process has the defects of relatively complex process, large equipment investment, high control precision requirement, thick coating, low production line speed, high production cost and the like, and the produced high-gloss paper has certain defects of glossiness, folding resistance, adhesive force, printing and gold stamping performance.

The composite transfer process is a new process for producing highlight paper, which is developed in recent years in China, and comprises the steps of coating highlight paint on paper, then compounding the paper with a film with a smooth surface (such as a PET film, an OPP film and the like), stripping a recovered film after curing, and utilizing the smooth surface of the film to mold a coating so as to enable the surface of the paper to be smooth and bright to form the highlight paper. The process has the advantages of simple equipment, easy operation, thin coating and high production speed. The high-gloss paint suitable for producing high-gloss paper by a composite transfer process has high performance requirement, not only requires high glossiness, but also has high heat and pressure resistance, and also meets the requirements of good folding resistance, good adhesive force with paper, good stripping property with a molded film, and safety and sanitation requirements of industries such as medicine, food, tobacco and the like. Therefore, the market has no water-based high-gloss paint which accords with a composite transfer process to produce high-end high-gloss paper so far, and the application and the rapid development of the process are hindered.

Disclosure of Invention

The invention aims to solve the technical problem of providing the water-based high-gloss coating and the preparation method thereof, the water-based high-gloss coating is used for producing high-gloss paper by a composite transfer process, the surface gloss of the paper is high, the heat resistance is good, the folding resistance is good, the adhesive force between the coating and the paper is good, the stripping property with a molded film is good, the VOC content is ultralow, and the water-based high-gloss coating meets the requirements of energy conservation, environmental protection, safety and sanitation. The technical scheme is as follows:

the water-based high-gloss paint is characterized by being prepared from the following raw materials in parts by weight: 40-60% of water, 8-40% of isocyanate, 5-15% of chain-extending resin, 5-10% of cross-linked resin, 1-10% of active polysiloxane, 2-5% of sulfonate hydrophilic chain extender, 0.5-3% of rear chain extender, 0.02-0.2% of rear cross-linking agent, 0.01-0.1% of procatalyst, 0.02-0.2% of rear catalyst, 0.5-5% of hydroxyl acrylate, 2-20% of methyl methacrylate, 2-10% of styrene, 0.1-0.4% of emulsifier, 0.1-0.4% of initiator, 0.01-0.05% of thickener, 0.05-0.2% of flatting agent, 0.1-0.3% of defoaming agent and 0.1-0.3% of preservative.

The water is used as a dispersant of the high-gloss paint, and deionized water is preferred.

The isocyanate is used as a hard segment part of the highlight coating, and the strength, the temperature resistance and other properties of the highlight coating are endowed. In a preferred embodiment, the isocyanate is one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), 4' -dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), and HDI trimer. More preferably, the isocyanate is one or a combination of isophorone diisocyanate (IPDI) and Hexamethylene Diisocyanate (HDI). IPDI and HDI can reduce the reaction speed of polyurethane, and ensure the molecular weight consistency and regularity of prepolymer.

The chain-extended resin is used as a soft segment component of the high-gloss coating, so that the high-gloss coating is endowed with flexibility. Preferably, the chain extension resin may be a polyether diamine (e.g., polyoxyethylene ether diamine, polyoxypropylene ether diamine having a molecular weight of 200-. The polyether is selected from DDL-400, DDL-1000, DDL-220, etc. of German Federal, and the polyester diol is selected from PE-3010, PE-3020, PE-3030, etc. having a gorgeon group. More preferably, the chain-extended resin is a polyether diamine having a molecular weight of 2000.

The cross-linked resin is used as a cross-linked soft segment component, so that the soft segment content and cross-linking points can be increased, and the strength, hardness and glossiness of the high-gloss coating are improved. Preferably, the crosslinking resin is a polyether polyol having a molecular weight of 200-1000, such as a polyether polyol having glycerol, pentaerythritol, sorbitol or sucrose as an initiator (e.g., Monocarb's designations YNW-6205, YNW-305, YNW-380, etc.). More preferably, the crosslinking resin is a sorbitol polyether polyol having a molecular weight of 400 and a functionality of 3.5.

The active polysiloxane endows the film strippability of the high-gloss paint with high heat resistance, and reduces damage to a coating and a molded film caused by static electricity during stripping. Preferably, the reactive polysiloxane is aminopropyl terminated polydimethylsiloxane or alcoholic hydroxyl terminated dimethylsiloxane, the molecular weight of which is 500-4000. More preferably, the above-mentioned reactive polysiloxane is an α, ω -dihydroxyhydrocarbyl polysiloxane having a molecular weight of 1000.

The sulfonate hydrophilic chain extender imparts self-emulsifying properties and strength to the polyurethane. The hydrophilic chain extender introduces hydrophilic groups on the molecular chain of the polyurethane prepolymer molecules to change the polyurethane molecules into the internal emulsifier with hydrophilic and lipophilic properties. The sulfonate hydrophilic chain extender can be an aqueous solution of ethylenediamine ethanesulfonic acid sodium salt (AAS salt) or 1, 2-dihydroxy-3-propanesulfonic acid sodium salt (DHPA), and the weight percentage concentration of the sulfonate hydrophilic chain extender is 40-60%.

The post-chain extender and the post-crosslinking agent are added into reaction materials during emulsification so as to improve the molecular weight and the hard segment content of the polymer. The post-chain extender and the post-crosslinking agent adopt micromolecule amines. Preferably, the post-chain extender is isophorone diamine (IPDA) or ethylene diamine and the post-crosslinker is diethylenetriamine.

The procatalyst is used to catalyze the reaction of isocyanate with chain-extended resin, cross-linked resin, reactive polysiloxane and hydroxy acrylate. The above procatalyst may be dibutyltin dilaurate, stannous octoate, potassium isooctanoate catalyst or bismuth based catalyst, preferably stannous octoate.

The post catalyst is used for promoting the complete chain extension reaction of the residual isocyanate group (NCO) and water in the system and preventing the residual isocyanate group in the system from imploding or generating slag in the post dropwise polymerization process. The above-mentioned post-catalyst may be an amine soluble in water, such as triethanolamine, dimethylethanolamine, dimorpholinodiethylether, etc., preferably dimorpholinodiethylether.

The hydroxy acrylate is a bridging resin of polyurethane and monomer (methyl methacrylate and styrene), and the end hydroxyl group is reacted with NCO of polyurethane prepolymer to intervene in unsaturated resin. The hydroxy acrylate may be hydroxyethyl methacrylate or hydroxyethyl acrylate, preferably hydroxyethyl methacrylate.

The methyl methacrylate and the styrene can reduce the viscosity of the prepolymer, reduce the cost of the highlight coating and improve the performances of the highlight coating such as weather resistance, strength, adhesive force and the like.

The emulsifier can improve the emulsifying property of the system, improve the stability of the emulsion and reduce the slag generated in the polymerization reaction process. The emulsifier can be one or the combination of alkyl alcohol ether sodium sulfate and nonylphenol polyoxyethylene ether ammonium sulfate. Preferably, the emulsifier is sodium alkyl alcohol ether sulfate.

The above initiator acts as a catalyst for the polymerization of the acrylic resin. The initiator may be potassium persulfate, sodium persulfate, ammonium persulfate or benzoyl peroxide, preferably potassium persulfate.

Preferably, the thickener is a polyurethane thickener such as Malachi RM-2020 NPR.

Preferably, the leveling agent is a polyether siloxane copolymer, such as TEGO Glide 410.

Preferably, the defoamer is a polyether defoamer, such as TEGOFoamex 825 Digao.

Preferably, the preservative is an isothiazolinone preservative, and the effective ingredient is a mixture of 2-methyl-4-isothiazolin-3-one and 5-chloro-2-methyl-4-isothiazolin-3-one.

The invention adopts a synthesis process of waterborne polyurethane modified acrylic acid, firstly isocyanate reacts with chain extension resin, cross-linking resin, active polysiloxane and hydroxyl acrylate step by step to generate polyurethane prepolymer, solvent methyl methacrylate and styrene are added in the reaction process to adjust viscosity, and sulfonate hydrophilic chain extender is added after cooling to react to ensure that the polyurethane prepolymer has hydrophilic performance; then adding water for emulsification under high-speed stirring, adding a post-chain extender and a post-crosslinking agent to further improve the molecular weight, and obtaining a waterborne polyurethane pre-emulsion; and finally, under the action of an initiator, carrying out a dropping method to carry out polymerization reaction on the waterborne polyurethane pre-emulsion containing the unsaturated monomer, and adding an auxiliary agent to obtain the high-gloss coating.

The invention also provides a preparation method of the water-based high-gloss paint, which is characterized by comprising the following steps:

(1) the following raw materials are prepared by weight: 40-60% of water, 8-40% of isocyanate, 5-15% of chain-extending resin, 5-10% of cross-linking resin, 1-10% of active polysiloxane, 2-5% of sulfonate hydrophilic chain extender, 0.5-3% of rear chain extender, 0.02-0.2% of rear cross-linking agent, 0.01-0.1% of procatalyst, 0.02-0.2% of rear catalyst, 0.5-5% of hydroxyl acrylate, 2-20% of methyl methacrylate, 2-10% of styrene, 0.1-0.4% of emulsifier, 0.1-0.4% of initiator, 0.01-0.05% of thickener, 0.05-0.2% of flatting agent, 0.1-0.3% of defoaming agent and 0.1-0.3% of preservative;

the water is divided into four parts: the first part of water accounts for 10-15% of the total water amount, and is used for dissolving the post-catalyst to obtain a post-catalyst aqueous solution for later use; the second part of water accounts for 10-15% of the total water amount, and is used for dissolving the post-chain extender and the post-crosslinking agent to obtain a post-chain extender and post-crosslinking agent aqueous solution for later use; the third part of water accounts for 10-15% of the total water amount and is used for dissolving the initiator to obtain an initiator aqueous solution for later use; the remaining water was used as a fourth water portion (55-70% of the total water) in pre-emulsification;

(2) respectively adding the chain-extending resin and the cross-linking resin into a water removal reaction kettle with a stirrer and a vacuum water removal system to remove water contained in the chain-extending resin and the cross-linking resin;

(3) adding the chain-extended resin with water removed into a first polymerization reaction kettle with a stirrer, dropwise adding isocyanate while stirring, heating to 70-85 ℃, and reacting for 0.5-1.5 hours; then adding the dehydrated crosslinking resin, and reacting for 1-3 hours at 70-85 ℃;

(4) adjusting the temperature in the first polymerization reaction kettle to 55-70 ℃, adding active polysiloxane, and reacting for 0.5-2 hours at 65-70 ℃;

(5) regulating the temperature in the first polymerization reaction kettle to 55-70 ℃, adding hydroxyl acrylate and a procatalyst, heating to 70-80 ℃, and reacting for 1-3 hours;

(6) adjusting the temperature in the first polymerization reaction kettle to 55-65 ℃, and then adding methyl methacrylate and styrene; then cooling to below 40 ℃, dropwise adding the sulfonate hydrophilic chain extender within 30 minutes, and stirring for 5-30 min;

(7) setting the stirring speed of the first polymerization reaction kettle to be 1000-3000rmp, adding fourth part of water into the first polymerization reaction kettle within 10-40min, emulsifying for 5-30min, dropwise adding the post-chain extender and post-crosslinking agent aqueous solution, and continuously stirring for 5-30 min; then reducing the stirring speed of the first polymerization reaction kettle to 50-300rmp, adding the post-catalyst aqueous solution into the first polymerization reaction kettle, and stirring for 10-30min to obtain a pre-emulsion;

(8) adding 10-30% of pre-emulsion into a second polymerization reaction kettle with a reflux device, adding an emulsifier, adding 10-30% of initiator aqueous solution, stirring and heating until reflux is generated in a reflux pipe (usually heating to 85 ℃), simultaneously dropwise adding the rest initiator aqueous solution and the rest pre-emulsion, and finishing dropwise adding within 3 hours; heating to 80-90 deg.C after dripping, maintaining the temperature for 20-60min, and cooling to 35-40 deg.C;

(9) and adding a defoaming agent, a thickening agent, a flatting agent and a preservative into the second polymerization reaction kettle, and uniformly stirring to obtain the water-based high-gloss paint.

Preferably, in the step (2), the chain-extended resin and the crosslinked resin are respectively added into a water removal reaction kettle with a stirrer and a vacuum water removal system, and then heated to 100-130 ℃ under the condition of stirring, and water is pumped for 1-3 hours under the vacuum degree of-0.01 MPa to-0.02 MPa, so as to remove the water contained therein.

And (5) filtering and discharging the water-based high-gloss paint obtained in the step (9).

The highlight coating synthesized by the process is a core-shell structure coating taking acrylate as a core and polyurethane as a shell, and the coating with the structure has the advantages of high brightness, strong adhesive force, folding resistance, temperature resistance, wear resistance, abrasion resistance, scratch resistance, small unit coating amount, low cost, safety, environmental protection, aging resistance, no toxicity, no harm and the like.

The water-based high-gloss coating is used for producing high-gloss paper by a composite transfer process, and has the advantages of high surface gloss of the paper, good heat resistance, good folding resistance, good adhesion of a coating and the paper, and good stripping property with a molded film. The water-based high-gloss paint disclosed by the invention has the advantages of ultralow VOC content, no toxicity, no harm and little environmental pollution, and meets the requirements of energy conservation, environmental protection, safety and sanitation. After the high-gloss paper is made and the subsequent processing (such as printing, gold stamping and the like) has the advantages of embossing resistance, solvent resistance, water resistance, folding resistance, explosion resistance, strong adhesive force, good flatness, leveling property and the like, and meanwhile, the high-gloss paper is low in cost, non-toxic, harmless and tasteless, is an ideal environment-friendly high-gloss packaging material, is suitable for packaging any solid object, and better meets the requirements of the industries of national tobacco, food, medicine and the like.

Detailed Description

Example 1

In this embodiment, the preparation method of the water-based high-gloss paint includes the following steps:

(1) the following raw materials are prepared by weight: 40% of water, 20% of isocyanate (all isophorone diisocyanate), 10% of chain extending resin (all polyether diamine (trade name: Delphin Federal ZD-1200)), 6% of crosslinking resin (all polyether polyol (trade name: Mononover YNW-6205) with sorbitol as an initiator), 6% of active polysiloxane (all alpha, omega-dihydroxy alkyl polysiloxane with molecular weight of 1000), 3% of sulfonate hydrophilic chain extender (all ethylene diamine sodium sulfonate aqueous solution (trade name: Yingchuang A95) with weight percentage concentration of 50%), 1% of rear chain extender (all ethylene diamine), 0.1% of rear crosslinking agent (all diethylene triamine), 0.05% of procatalyst (all stannous octoate), 0.05% of rear catalyst (all dimorpholinyl diethyl ether), 3% of hydroxyl acrylate (all hydroxyethyl acrylate), 4.8% of methyl methacrylate, 5% of styrene, 0.2% of emulsifier (sodium alkyl alcohol ether sulfate), 0.3% of initiator (potassium persulfate), 0.03% of thickener (polyurethane thickener, Malhun RM-2020 NPR), 0.07% of flatting agent (polyether siloxane copolymer, TEGO Glide 410), 0.2% of defoaming agent (polyether defoaming agent, TEGOFoamex 825 defoaming agent with diji), and 0.2% of preservative (isothiazolinone preservative);

the water is divided into four parts: the first part of water accounts for 12.5 percent of the total water amount and is used for dissolving the post-catalyst to obtain a post-catalyst aqueous solution for later use; the second part of water accounts for 12.5% of the total water amount and is used for dissolving the post-chain extender and the post-crosslinking agent to obtain a post-chain extender and post-crosslinking agent aqueous solution for later use; the third part of water accounts for 12.5 percent of the total water amount and is used for dissolving the initiator to obtain an initiator aqueous solution for later use; the remaining water was used as a fourth water portion (62.5% of the total water) in pre-emulsification;

(2) adding the chain-extended resin and the cross-linked resin into a water removal reaction kettle with a stirrer and a vacuum water removal system respectively, and removing water contained in the resin (after adding the chain-extended resin and the cross-linked resin into the water removal reaction kettle with the stirrer and the vacuum water removal system respectively, heating to 120 ℃ under the stirring condition, pumping water for 2 hours under the vacuum degree of-0.01 MPa, and removing the water contained in the resin);

(3) adding the chain-extended resin with water removed into a first polymerization reaction kettle with a stirrer, dropwise adding isocyanate while stirring, heating to 70-85 ℃, and reacting for 1 hour; then adding the dehydrated crosslinking resin, and reacting for 2 hours at 70-85 ℃;

(4) adjusting the temperature in the first polymerization reaction kettle to 65 ℃, adding active polysiloxane, and reacting for 1 hour at 65-70 ℃;

(5) adjusting the temperature in the first polymerization reaction kettle to 65 ℃, adding hydroxyl acrylate and a procatalyst, heating to 70-80 ℃, and reacting for 2 hours;

(6) adjusting the temperature in the first polymerization reaction kettle to 60 ℃, and then adding methyl methacrylate and styrene; then cooling to below 40 ℃, dropwise adding the sulfonate hydrophilic chain extender within 30 minutes, and stirring for 10 min;

(7) setting the stirring speed of the first polymerization reaction kettle to 2000rmp, adding fourth part of water into the first polymerization reaction kettle within 30min, emulsifying for 10min, dropwise adding a post-chain extender and post-crosslinking agent aqueous solution, and continuously stirring for 10 min; then reducing the stirring speed of the first polymerization reaction kettle to 100rmp, adding the post-catalyst aqueous solution into the first polymerization reaction kettle, and stirring for 20min to obtain a pre-emulsion;

(8) adding 10% of pre-emulsion into a second polymerization reaction kettle with a reflux device, adding an emulsifier, adding 10% of initiator aqueous solution, stirring and heating until reflux is generated in a reflux pipe (heating to 85 ℃), simultaneously dropwise adding the rest of initiator aqueous solution and the rest of pre-emulsion, and finishing dropwise adding within 3 hours; after the dropwise addition, heating to 85 ℃, preserving the heat for 30min, and then cooling to 35 ℃;

(9) and adding a defoaming agent, a thickening agent, a flatting agent and a preservative into the second polymerization reaction kettle, and uniformly stirring to obtain the water-based high-gloss paint.

And (5) filtering and discharging the water-based high-gloss paint obtained in the step (9).

Example 2

In this embodiment, the preparation method of the water-based high-gloss paint includes the following steps:

(1) the following raw materials are prepared by weight: 53 percent of water, 8.4 percent of isocyanate (all hexamethylene diisocyanate), 5 percent of chain extending resin (all polyaspartic acid ester with the molecular weight of 560 (trade name: Qinzhou Qixiang NQ 420)), 5 percent of cross-linking resin (all sorbitol polyether polyol with the molecular weight of 400 and the functionality of 3.5), 10 percent of active polysiloxane (all aminopropyl terminated polydimethylsiloxane with the molecular weight of 1000), 2 percent of sulfonate hydrophilic chain extender (all ethylene diamine sodium sulfonate aqueous solution with the weight percentage concentration of 50 percent (trade name: Yingchuang A95)), 3 percent of rear chain extender (all ethylene diamine), 0.2 percent of rear cross-linking agent (all diethylene triamine), 0.02 percent of procatalyst (all stannous octoate), 0.2 percent of rear catalyst (all dimorpholinyl diethyl ether), 0.5 percent of hydroxyl acrylate (all hydroxyethyl methacrylate), 10 percent of methyl methacrylate, 2% of styrene, 0.1% of emulsifier (sodium alkyl alcohol ether sulfate), 0.1% of initiator (potassium persulfate), 0.02% of thickener (polyurethane thickener, Malhun RM-2020 NPR), 0.06% of flatting agent (polyether siloxane copolymer, TEGO Glide 410), 0.3% of defoaming agent (polyether defoaming agent, TEGOFoamex 825 defoaming agent with diji), and 0.1% of preservative (isothiazolinone preservative);

the water is divided into four parts: the first part of water accounts for 10% of the total water amount and is used for dissolving the post-catalyst to obtain a post-catalyst aqueous solution for later use; the second part of water accounts for 15% of the total water amount and is used for dissolving the post-chain extender and the post-crosslinking agent to obtain a post-chain extender and post-crosslinking agent aqueous solution for later use; the third part of water accounts for 15 percent of the total water amount and is used for dissolving the initiator to obtain an initiator aqueous solution for later use; the remaining water was used as a fourth water portion (60% of the total water) in pre-emulsification;

(2) adding the chain-extended resin and the cross-linked resin into a water removal reaction kettle with a stirrer and a vacuum water removal system respectively, and removing water contained in the resin (after adding the chain-extended resin and the cross-linked resin into the water removal reaction kettle with the stirrer and the vacuum water removal system respectively, heating to 130 ℃ under the stirring condition, pumping water for 1.5 hours under the vacuum degree of-0.02 MPa, and removing the water contained in the resin);

(3) adding the chain-extended resin with water removed into a first polymerization reaction kettle with a stirrer, dropwise adding isocyanate while stirring, heating to 70-85 ℃, and reacting for 0.6 hour; then adding the dehydrated crosslinking resin, and reacting for 2.5 hours at 70-85 ℃;

(4) adjusting the temperature in the first polymerization reaction kettle to 60 ℃, adding active polysiloxane, and reacting for 0.6 hour at 65-70 ℃;

(5) regulating the temperature in the first polymerization reaction kettle to 60 ℃, adding hydroxyl acrylate and a procatalyst, heating to 70-80 ℃, and reacting for 1.5 hours;

(6) adjusting the temperature in the first polymerization reaction kettle to 55 ℃, and then adding methyl methacrylate and styrene; then cooling to below 40 ℃, dropwise adding the sulfonate hydrophilic chain extender within 30 minutes, and stirring for 30 min;

(7) setting the stirring speed of the first polymerization reaction kettle to 1000rmp, adding fourth part of water into the first polymerization reaction kettle within 40min, emulsifying for 15min, dropwise adding a post-chain extender and post-crosslinking agent aqueous solution, and continuously stirring for 15 min; then reducing the stirring speed of the first polymerization reaction kettle to 50rmp, adding the post-catalyst aqueous solution into the first polymerization reaction kettle, and stirring for 30min to obtain a pre-emulsion;

(8) adding the pre-emulsion accounting for 20 percent of the total amount into a second polymerization reactor with a reflux device, adding the emulsifier, adding the initiator aqueous solution accounting for 20 percent of the total amount, stirring and heating until reflux is generated in a reflux pipe (heating to 85 ℃), simultaneously dropwise adding the rest initiator aqueous solution and the rest pre-emulsion, and finishing dropwise adding within 3 hours; heating to 80 ℃ after the dropwise adding is finished, preserving the heat for 60min, and then cooling to 40 ℃;

(9) and adding a defoaming agent, a thickening agent, a flatting agent and a preservative into the second polymerization reaction kettle, and uniformly stirring to obtain the water-based high-gloss paint.

And (5) filtering and discharging the water-based high-gloss paint obtained in the step (9).

Example 3

In this embodiment, the preparation method of the water-based high-gloss paint includes the following steps:

(1) the following raw materials are prepared by weight: 40% of water, 28.2% of isocyanate (all diphenylmethane diisocyanate), 6% of chain-extending resin (all polyoxyethylene ether diol with molecular weight of 2000 (trade name: Monocarb YNW-220)), 10% of crosslinking resin (all polyoxyethylene ether triol with molecular weight of 1000 and functionality of 3), 1% of active polysiloxane (all alpha, omega-dihydroxyalkyl polysiloxane with molecular weight of 1000), 4% of sulfonate hydrophilic chain extender (all 1, 2-dihydroxy-3-sodium propanesulfonate aqueous solution with weight percentage concentration of 50%), 0.5% of rear chain extender (all isophorone diamine), 0.03% of rear crosslinking agent (all diethylene triamine), 0.1% of procatalyst (all dibutyltin dilaurate), 0.02% of rear catalyst (all triethanolamine), 4% of hydroxyl acrylate (all hydroxyethyl methacrylate), 2% of methyl methacrylate, 3% of styrene, 0.4% of emulsifier (both nonylphenol polyoxyethylene ether ammonium sulfate), 0.1% of initiator (both ammonium persulfate), 0.05% of thickener (both polyurethane thickeners and clonidine RM-2020 NPR), 0.2% of flatting agent (both polyether siloxane copolymer and TEGO Glide 410), 0.1% of defoaming agent (both polyether defoaming agent and Digao TEGOFoamex 825 defoaming agent), and 0.3% of preservative (both isothiazolinone preservative);

the water is divided into four parts: the first part of water accounts for 10% of the total water amount and is used for dissolving the post-catalyst to obtain a post-catalyst aqueous solution for later use; the second part of water accounts for 15% of the total water amount and is used for dissolving the post-chain extender and the post-crosslinking agent to obtain a post-chain extender and post-crosslinking agent aqueous solution for later use; the third part of water accounts for 10 percent of the total water amount and is used for dissolving the initiator to obtain an initiator aqueous solution for later use; the remaining water was used as a fourth water portion (65% of the total water) in pre-emulsification;

(2) adding the chain-extended resin and the cross-linked resin into a water removal reaction kettle with a stirrer and a vacuum water removal system respectively, and removing water contained in the resin (after adding the chain-extended resin and the cross-linked resin into the water removal reaction kettle with the stirrer and the vacuum water removal system respectively, heating to 110 ℃ under the stirring condition, pumping water for 3 hours under the vacuum degree of-0.01 MPa, and removing the water contained in the resin);

(3) adding the chain-extended resin with water removed into a first polymerization reaction kettle with a stirrer, dropwise adding isocyanate while stirring, heating to 70-85 ℃, and reacting for 1.5 hours; then adding the dehydrated crosslinking resin, and reacting for 3 hours at 70-85 ℃;

(4) adjusting the temperature in the first polymerization reaction kettle to 55 ℃, adding active polysiloxane, and reacting for 1 hour at 65-70 ℃;

(5) adjusting the temperature in the first polymerization reaction kettle to 55 ℃, adding hydroxyl acrylate and a procatalyst, heating to 70-80 ℃, and reacting for 3 hours;

(6) adjusting the temperature in the first polymerization reaction kettle to 55 ℃, and then adding methyl methacrylate and styrene; then cooling to below 40 ℃, dropwise adding the sulfonate hydrophilic chain extender within 30 minutes, and stirring for 15 min;

(7) setting the stirring speed of the first polymerization reaction kettle to 3000rmp, adding a fourth part of water into the first polymerization reaction kettle within 15min, emulsifying for 6min, dropwise adding a post-chain extender and post-crosslinking agent aqueous solution, and continuously stirring for 6 min; then reducing the stirring speed of the first polymerization reaction kettle to 300rmp, adding the post-catalyst aqueous solution into the first polymerization reaction kettle, and stirring for 10min to obtain a pre-emulsion;

(8) adding 15% of pre-emulsion into a second polymerization reaction kettle with a reflux device, adding an emulsifier, adding 15% of initiator aqueous solution, stirring and heating until reflux is generated in a reflux pipe (heating to 85 ℃), simultaneously dropwise adding the rest of initiator aqueous solution and the rest of pre-emulsion, and finishing dropwise adding within 3 hours; heating to 90 ℃ after the dropwise adding is finished, preserving the heat for 25min, and then cooling to 40 ℃;

(9) and adding a defoaming agent, a thickening agent, a flatting agent and a preservative into the second polymerization reaction kettle, and uniformly stirring to obtain the water-based high-gloss paint.

And (5) filtering and discharging the water-based high-gloss paint obtained in the step (9).

The water-based highlight paint of the embodiments 1 to 3 and the existing market highlight paint product are respectively and uniformly coated on the paperboard, compounded with the OPP film, stripped after being dried and cured to recover the OPP film, and the detection indexes are compared with the existing market product as shown in the following table. As can be seen from the table, the surface gloss, adhesion, folding resistance, heat resistance and printing adaptability of the high gloss coating prepared by the invention are all higher than those of the products in the existing market.