CN113185910A - Coating process of water-based plastic substitute - Google Patents
Coating process of water-based plastic substitute Download PDFInfo
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- CN113185910A CN113185910A CN202110551579.0A CN202110551579A CN113185910A CN 113185910 A CN113185910 A CN 113185910A CN 202110551579 A CN202110551579 A CN 202110551579A CN 113185910 A CN113185910 A CN 113185910A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4205—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups
- C08G18/423—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing cycloaliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
Abstract
The invention relates to the technical field of paper-plastic processing, in particular to a coating process for water-based plastic replacement. Although the polyurethane synthesized by polyether polyol has better flexibility and hydrolysis resistance, the cohesive energy of the polyurethane synthesized by the polyester polyol is stronger, the anti-tack performance is more excellent, in addition, excessive isocyanate with a cyclic monomer is adopted to react with the polyester polyol, the further initiation of the cyclic monomer can improve the strength and the water resistance of a coating, and then the cyclic monomer reacts with hydroxyethyl acrylate and a hydrophilic chain extender to form a polyurethane acrylate aqueous system, so that the emulsion has better emulsion stability, and an adhesive film with better hardness, flexibility, adhesiveness, anti-tack and water resistance can be quickly formed through photocuring.
Description
Technical Field
The invention relates to the technical field of paper-plastic processing, in particular to a coating process for water-based plastic replacement.
Background
The traditional paper adopts a paper-plastic film-coated material, an adhesive is coated on a plastic film through a roller coating device, the plastic film is heated through a hot-pressing roller to soften the film, and then a printed product coated with a base material is pressed with the film to form a paper-plastic integrated film-coated product. But the phenomena of corrugation, foaming and finished product curling can occur in the production process, and the problems of white pollution, difficult circular pulping and the like are easily caused.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a water-based plastic-replacing coating process, which adopts water-based UV (ultraviolet) curing coating to replace the traditional glue water thermosetting film-coating technology.
The purpose of the invention is realized by the following technical scheme:
a coating process of water-based plastic substitute comprises the following steps:
(1) synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 13.1-15.5 parts of adipic acid, 7.3-7.9 parts of 1, 4-cyclohexanedimethanol, 6.6-7.0 parts of 2, 2-dimethyl-1, 3-propanediol and 3.4-3.8 parts of 1, 4-butanediol by mole, adding the reaction monomers into a reaction kettle, mixing, heating to 120 ℃ of 100-;
(2) synthesis of polyurethane acrylate prepolymer: weighing 12-15% of isophorone diisocyanate, 11-13% of polyester polyol prepared in step (1), 4-7% of hydroxyethyl acrylate, 1-2% of hydrophilic chain extender, 1-2% of trimethylolpropane, 0.01-0.1% of second catalyst, 1-2% of neutralizer, 0.1-0.3% of defoaming agent and the balance of water according to weight percentage, adding isophorone diisocyanate, polyester polyol and second catalyst into a reaction kettle, heating to 80-90 ℃ and reacting for 1-2h, then adding hydrophilic chain extender and trimethylolpropane, reacting for 2-3h at 60-80 ℃, then adding hydroxyethyl acrylate, continuing to react for 1-2h at a constant temperature, cooling to 30-40 ℃, adding neutralizer for neutralization, then cooling to normal temperature, adding defoaming agent and water, stirring and mixing, thus obtaining polyurethane acrylate prepolymer;
(3) preparing the water-based plastic substitute: adding an active diluent monomer and an initiator into the polyurethane acrylate prepolymer, stirring uniformly, standing and defoaming to obtain a water-based plastic substitute, wherein the adding amounts of the active diluent monomer and the initiator are respectively 15-25 wt% and 0.1-0.2 wt% of the polyurethane acrylate prepolymer;
(4) coating and curing: and coating the water-based plastic substitute plastic on a base material, and curing under ultraviolet irradiation to form a glue film.
The ultraviolet curing coating is a new environment-friendly technology, the energy consumed by curing is far lower than that of the traditional thermosetting coating, and the ultraviolet curing coating has the advantages of low curing temperature, high curing speed, small environmental pollution and the like, wherein the aqueous polyurethane acrylate is a main aqueous UV coating. The water-based plastic substitute is prepared from hydroxyethyl acrylate, polyester polyol and isocyanate as raw materials to prepare a double-bond-containing polyurethane acrylate prepolymer, and the double-bond-containing polyurethane acrylate prepolymer and an active diluent monomer are subjected to polymerization reaction under the action of ultraviolet-initiated free radical polymerization, so that curing is realized. The water-based plastic-replacing glue film of the invention is used as a glue film on paper, and needs to have better hardness, flexibility, adhesiveness, anti-tack property and water resistance, but ester groups in polyurethane are easy to hydrolyze, and hydrophilic monomers (hydrophilic chain extenders) are needed to reach a stable emulsion state, so the water resistance is poor. The invention mainly solves the technical problem of how to improve the water resistance of the water-based plastic substitute and make the plastic substitute have better comprehensive performance.
The invention is improved from the polyol, and the polyester polyol is selected between polyether polyol and polyester polyol. Although polyurethane synthesized by polyether polyol has better flexibility and hydrolysis resistance, the polyurethane synthesized by polyester polyol has stronger cohesive energy and is more excellent in anti-tack performance.
Furthermore, the cyclohexane dimethanol and the 2, 2-dimethyl-1, 3-propylene glycol are added into the special polyester polyol, and the steric effect of the polyol can be improved and ester groups can be shielded by adding the cyclic group and the side chain dimethyl, so that the hardness and the hydrolysis resistance of the coating are improved; the reason why cyclohexanedimethanol is used instead of cyclohexanedicarboxylic acid, which has a better hydrolysis resistance, is that the molecular weight of the polyurethane acrylic prepolymer is too large to facilitate the radical polymerization, so that only adipic acid with a lower molecular weight is used as the dibasic acid, thereby reducing the molecular weight of the polyester polyol. In addition, the invention does not select single cyclohexane dimethanol and single 2, 2-dimethyl-1, 3-propylene glycol to improve the hydrolytic resistance, because the cyclic group activity of the cyclohexane dimethanol is poor, and excessive addition can cause the flexibility of the coating to be poor, and the coating is easy to break when the paper base product is used as a paper base product needing to be bent; the side methyl has a certain mobility, so that the hydrolysis resistance can be improved, the excessive reduction of the flexibility can be well avoided, and the disordered side chain arrangement can be generated on the main chain of the polyurethane by the matching use of the cyclohexanedicarboxylic acid and the 2, 2-dimethyl-1, 3-propylene glycol, so that the formation of hydrogen bonds in the polyester polyol is inhibited, the separation degree of a microphase structure can be reduced, the glass transition temperature is improved, and the anti-tack-back is improved.
In addition, in the polyurethane synthesis, the excessive isocyanate with the cyclic monomer is also adopted to react with the polyester polyol, the strength and the water resistance of the coating can be improved by further initiation of the cyclic monomer, and then the cyclic monomer reacts with the hydroxyethyl acrylate and the hydrophilic chain extender to form a polyurethane acrylate aqueous system, so that the emulsion stability is better, and a glue film with better hardness, flexibility, adhesiveness, anti-tack property and water resistance can be quickly formed through photocuring.
Wherein the first catalyst and the second catalyst are both organic tin catalysts, and the addition amount of the first catalyst is 0.05-0.1% of the reaction monomer.
Wherein the addition amount of the dimethylbenzene is 3-5% of the reaction monomer.
Wherein the molecular weight of the polyester polyol is 1500-.
Wherein the hydrophilic chain extender is at least one of dimethylolpropionic acid, ethylene diamino ethyl sodium sulfonate and diethylenetriamine. Preferably, the chain extender is dihydroxymethylpropionic acid.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the neutralizing agent is triethylamine.
Wherein the initiator is a photoinitiator TPO and/or a photoinitiator 184. Preferably, the initiator consists of the photoinitiator TPO and the photoinitiator 184 in a weight ratio of 1: 1.
Wherein the reactive diluent monomer is at least one of tripropylene glycol diacrylate, trimethylolpropane triacrylate and pentaerythritol triacrylate. Preferably, the reactive diluent monomer is tripropylene glycol diacrylate.
The invention has the beneficial effects that:
the invention is improved from the polyol, and the polyester polyol is selected between polyether polyol and polyester polyol. Although polyurethane synthesized by polyether polyol has better flexibility and hydrolysis resistance, the polyurethane synthesized by polyester polyol has stronger cohesive energy and is more excellent in anti-tack performance.
Furthermore, the cyclohexane dimethanol and the 2, 2-dimethyl-1, 3-propylene glycol are added into the special polyester polyol, and the steric effect of the polyol can be improved and ester groups can be shielded by adding the cyclic group and the side chain dimethyl, so that the hardness and the hydrolysis resistance of the coating are improved; the reason why cyclohexanedimethanol is used instead of cyclohexanedicarboxylic acid, which has a better hydrolysis resistance, is that the molecular weight of the polyurethane acrylic prepolymer is too large to facilitate the radical polymerization, so that only adipic acid with a lower molecular weight is used as the dibasic acid, thereby reducing the molecular weight of the polyester polyol. In addition, the invention does not select single cyclohexane dimethanol and single 2, 2-dimethyl-1, 3-propylene glycol to improve the hydrolytic resistance, because the cyclic group activity of the cyclohexane dimethanol is poor, and excessive addition can cause the flexibility of the coating to be poor, and the coating is easy to break when the paper base product is used as a paper base product needing to be bent; the side methyl has a certain mobility, so that the hydrolysis resistance can be improved, the excessive reduction of the flexibility can be well avoided, and the disordered side chain arrangement can be generated on the main chain of the polyurethane by the matching use of the cyclohexanedicarboxylic acid and the 2, 2-dimethyl-1, 3-propylene glycol, so that the formation of hydrogen bonds in the polyester polyol is inhibited, the separation degree of a microphase structure can be reduced, the glass transition temperature is improved, and the anti-tack-back is improved.
In addition, in the polyurethane synthesis, the excessive isocyanate with the cyclic monomer is also adopted to react with the polyester polyol, the strength and the water resistance of the coating can be improved by further initiation of the cyclic monomer, and then the cyclic monomer reacts with the hydroxyethyl acrylate and the hydrophilic chain extender to form a polyurethane acrylate aqueous system, so that the emulsion stability is better, and a glue film with better hardness, flexibility, adhesiveness, anti-tack property and water resistance can be quickly formed through photocuring.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
A coating process of water-based plastic substitute comprises the following steps:
(1) synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 13.8 parts of adipic acid, 7.6 parts of 1, 4-cyclohexanedimethanol, 6.8 parts of 2, 2-dimethyl-1, 3-propanediol and 3.6 parts of 1, 4-butanediol by mole, adding the reaction monomers into a reaction kettle, mixing, heating to 110 ℃, adding the first catalyst and the xylene, heating to 200 ℃, carrying out heat preservation reaction for 4 hours, cooling to 145 ℃, vacuumizing, and stopping heating after the acid value is lower than 1mgKOH/g to obtain the polyester polyol;
(2) synthesis of polyurethane acrylate prepolymer: weighing 13.5% of isophorone diisocyanate, 12% of polyester polyol prepared in the step (1), 5.5% of hydroxyethyl acrylate, 1.5% of hydrophilic chain extender, 1.5% of trimethylolpropane, 0.02% of second catalyst, 1.5% of neutralizer, 0.2% of defoaming agent and the balance of water according to the weight percentage, adding isophorone diisocyanate, polyester polyol and second catalyst into a reaction kettle, heating to 85 ℃ and reacting for 1.5h, then adding hydrophilic chain extender and trimethylolpropane, reacting at 70 ℃ for 2.5h, then adding hydroxyethyl acrylate, continuing to react for 1.5h at a constant temperature, cooling to 35 ℃, adding neutralizer for neutralization, then cooling to normal temperature, adding defoaming agent and water, stirring and mixing to obtain a polyurethane acrylate prepolymer;
(3) preparing the water-based plastic substitute: adding an active diluent monomer and an initiator into the polyurethane acrylate prepolymer, uniformly stirring, standing and defoaming to obtain a water-based plastic substitute, wherein the adding amounts of the active diluent monomer and the initiator are respectively 20 wt% and 0.15 wt% of the polyurethane acrylate prepolymer;
(4) coating and curing: and coating the water-based plastic substitute plastic on a base material, and curing under ultraviolet irradiation to form a glue film.
The first catalyst and the second catalyst are both organic tin catalysts, and the addition amount of the first catalyst is 0.07 percent of the reaction monomer.
Wherein the addition amount of the xylene is 4 percent of the reaction monomer.
Wherein the polyester polyol has a molecular weight of 2000.
Wherein the hydrophilic chain extender is dimethylolpropionic acid.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the neutralizing agent is triethylamine.
Wherein the initiator consists of a photoinitiator TPO and a photoinitiator 184 according to the weight ratio of 1: 1.
Wherein the reactive diluent monomer is tripropylene glycol diacrylate.
Example 2
A coating process of water-based plastic substitute comprises the following steps:
(1) synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 13.1 parts of adipic acid, 7.3 parts of 1, 4-cyclohexanedimethanol, 6.6 parts of 2, 2-dimethyl-1, 3-propanediol and 3.4 parts of 1, 4-butanediol by mole, adding the reaction monomers into a reaction kettle, mixing, heating to 100 ℃, then adding the first catalyst and the xylene, heating to 180 ℃, carrying out heat preservation reaction for 3 hours, cooling to 140 ℃, vacuumizing, and stopping heating after the acid value is lower than 1mgKOH/g to obtain the polyester polyol;
(2) synthesis of polyurethane acrylate prepolymer: weighing 12% of isophorone diisocyanate, 11% of polyester polyol prepared in the step (1), 4% of hydroxyethyl acrylate, 1-2% of hydrophilic chain extender, 1% of trimethylolpropane, 0.01% of second catalyst, 1% of neutralizer, 0.1% of defoaming agent and the balance of water according to the weight percentage, adding isophorone diisocyanate, polyester polyol and second catalyst into a reaction kettle, heating to 80 ℃ and reacting for 1h, then adding hydrophilic chain extender and trimethylolpropane, reacting for 2h at 60 ℃, then adding hydroxyethyl acrylate, continuing to perform heat preservation reaction for 1h, cooling to 30 ℃, adding neutralizing agent for neutralization, then cooling to normal temperature, adding defoaming agent and water, stirring and mixing to obtain a polyurethane acrylate prepolymer;
(3) preparing the water-based plastic substitute: adding an active diluent monomer and an initiator into the polyurethane acrylate prepolymer, uniformly stirring, standing and defoaming to obtain a water-based plastic substitute, wherein the adding amounts of the active diluent monomer and the initiator are respectively 15 wt% and 0.1 wt% of the polyurethane acrylate prepolymer;
(4) coating and curing: and coating the water-based plastic substitute plastic on a base material, and curing under ultraviolet irradiation to form a glue film.
The first catalyst and the second catalyst are both organic tin catalysts, and the addition amount of the first catalyst is 0.05% of the reaction monomer.
Wherein the addition amount of the xylene is 3 percent of the reaction monomer.
Wherein the molecular weight of the polyester polyol is 1500.
Wherein the hydrophilic chain extender is ethylene diamino ethyl sodium sulfonate.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the neutralizing agent is triethylamine.
Wherein the initiator is a photoinitiator TPO.
Wherein the reactive diluent monomer is trimethylolpropane triacrylate.
Example 3
A coating process of water-based plastic substitute comprises the following steps:
(1) synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 15.5 parts of adipic acid, 7.9 parts of 1, 4-cyclohexanedimethanol, 7.0 parts of 2, 2-dimethyl-1, 3-propanediol and 3.8 parts of 1, 4-butanediol in molar parts, adding the reaction monomers into a reaction kettle, mixing, heating to 120 ℃, adding the first catalyst and the xylene, heating to 220 ℃, carrying out heat preservation reaction for 3-5 hours, cooling to 150 ℃, vacuumizing, and stopping heating after the acid value is lower than 1mgKOH/g to obtain the polyester polyol;
(2) synthesis of polyurethane acrylate prepolymer: weighing 15% of isophorone diisocyanate, 13% of polyester polyol prepared in the step (1), 7% of hydroxyethyl acrylate, 1-2% of hydrophilic chain extender, 2% of trimethylolpropane, 0.1% of second catalyst, 2% of neutralizer, 0.3% of defoaming agent and the balance of water according to the weight percentage, adding isophorone diisocyanate, polyester polyol and second catalyst into a reaction kettle, heating to 90 ℃ and reacting for 2 hours, then adding hydrophilic chain extender and trimethylolpropane, reacting for 3 hours at 80 ℃, then adding hydroxyethyl acrylate, continuing to perform heat preservation reaction for 2 hours, cooling to 40 ℃, adding neutralizing agent for neutralization, then cooling to normal temperature, adding defoaming agent and water, stirring and mixing to obtain a polyurethane acrylate prepolymer;
(3) preparing the water-based plastic substitute: adding an active diluent monomer and an initiator into the polyurethane acrylate prepolymer, uniformly stirring, standing and defoaming to obtain a water-based plastic substitute, wherein the adding amounts of the active diluent monomer and the initiator are respectively 25 wt% and 0.2 wt% of the polyurethane acrylate prepolymer;
(4) coating and curing: and coating the water-based plastic substitute plastic on a base material, and curing under ultraviolet irradiation to form a glue film.
The first catalyst and the second catalyst are both organic tin catalysts, and the addition amount of the first catalyst is 0.1% of the reaction monomer.
Wherein the addition amount of the xylene is 5 percent of the reaction monomer.
Wherein the molecular weight of the polyester polyol is 2500.
Wherein the hydrophilic chain extender is diethylenetriamine.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the neutralizing agent is triethylamine.
Wherein the initiator is a photoinitiator 184.
Wherein the reactive diluent monomer is pentaerythritol triacrylate.
Comparative example 1
This comparative example differs from example 1 in that:
synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 13.8 parts of adipic acid, 14.4 parts of 1, 4-cyclohexanedimethanol and 3.6 parts of 1, 4-butanediol in molar parts, adding the reaction monomers into a reaction kettle, mixing, heating to 110 ℃, then adding the first catalyst and the xylene, heating to 200 ℃, carrying out heat preservation reaction for 4 hours, cooling to 145 ℃, vacuumizing, and stopping heating after the acid value is lower than 1mgKOH/g, thus obtaining the polyester polyol.
Comparative example 2
This comparative example differs from example 1 in that:
synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 13.8 parts of adipic acid, 14.4 parts of 2, 2-dimethyl-1, 3-propanediol and 3.6 parts of 1, 4-butanediol in molar parts, adding the reaction monomers into a reaction kettle, mixing, heating to 110 ℃, adding the first catalyst and the xylene, heating to 200 ℃, carrying out heat preservation reaction for 4 hours, cooling to 145 ℃, carrying out vacuum pumping, stopping heating after the acid value is lower than 1mgKOH/g, and thus obtaining the polyester polyol.
Comparative example 3
This comparative example differs from example 1 in that:
synthesis of polyurethane acrylate prepolymer: weighing 13.5% of isophorone diisocyanate, 12% of polycaprolactone diol (with the molecular weight of 1500), 5.5% of hydroxyethyl acrylate, 1.5% of hydrophilic chain extender, 1.5% of trimethylolpropane, 0.02% of second catalyst, 1.5% of neutralizer, 0.2% of defoaming agent and the balance of water according to the weight percentage, adding isophorone diisocyanate, polyester polyol and second catalyst into a reaction kettle, heating to 85 ℃ and reacting for 1.5h, then adding hydrophilic chain extender and trimethylolpropane, reacting for 2.5h at 70 ℃, then adding hydroxyethyl acrylate, continuing to react for 1.5h at a constant temperature, cooling to 35 ℃, adding neutralizer for neutralization, then cooling to normal temperature, adding defoaming agent and water, stirring and mixing to obtain the polyurethane acrylate prepolymer.
The water-based plastic substitutes of example 1 and comparative examples 1 to 3 were tested for film hardness, film adhesion, film water resistance and film blocking resistance as follows:
film hardness: GB/T6739-2006;
film layer flexibility: curing the water-based plastic substitute on the gray card paper, repeatedly folding the gray card for 10 times along the same folding line, and judging that the film passes the flexibility test if the film layer has no phenomena of fading, cracking, whitening and the like;
film layer adhesiveness: after curing the water-based plastic substitute on the gray cardboard, adhering the cured water-based plastic substitute on the gray cardboard by using a 3M600 adhesive tape, peeling the adhesive tape at an angle of 90 degrees, and judging that the adhesive test is passed if the film layer does not fall off, lose gloss, lose color and the like;
and (3) water resistance of the film layer: curing the water-based plastic substitute on the gray card paper, soaking the gray card paper in water for 36 hours, removing and airing, and judging that the water resistance test is passed if the film layer does not fall off, bubble and the like;
the test results were as follows:
| example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Hardness of film layer | 5H | 5H | 3H | 3H |
| Film flexibility | By passing | Do not pass through | By passing | Do not pass through |
| Film adhesion | By passing | By passing | Do not pass through | By passing |
| Water resistance of film layer | By passing | By passing | By passing | Do not pass through |
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (9)
1. A coating process of water-based plastic substitute is characterized in that: the method comprises the following steps:
(1) synthesis of polyester polyol: weighing reaction monomers, a first catalyst and xylene, wherein the reaction monomers comprise 13.1-15.5 parts of adipic acid, 7.3-7.9 parts of 1, 4-cyclohexanedimethanol, 6.6-7.0 parts of 2, 2-dimethyl-1, 3-propanediol and 3.4-3.8 parts of 1, 4-butanediol by mole, adding the reaction monomers into a reaction kettle, mixing, heating to 120 ℃ of 100-;
(2) synthesis of polyurethane acrylate prepolymer: weighing 12-15% of isophorone diisocyanate, 11-13% of polyester polyol prepared in step (1), 4-7% of hydroxyethyl acrylate, 1-2% of hydrophilic chain extender, 1-2% of trimethylolpropane, 0.01-0.1% of second catalyst, 1-2% of neutralizer, 0.1-0.3% of defoaming agent and the balance of water according to weight percentage, adding isophorone diisocyanate, polyester polyol and second catalyst into a reaction kettle, heating to 80-90 ℃ and reacting for 1-2h, then adding hydrophilic chain extender and trimethylolpropane, reacting for 2-3h at 60-80 ℃, then adding hydroxyethyl acrylate, continuing to react for 1-2h at a constant temperature, cooling to 30-40 ℃, adding neutralizer for neutralization, then cooling to normal temperature, adding defoaming agent and water, stirring and mixing, thus obtaining polyurethane acrylate prepolymer;
(3) preparing the water-based plastic substitute: adding an active diluent monomer and an initiator into the polyurethane acrylate prepolymer, stirring uniformly, standing and defoaming to obtain a water-based plastic substitute, wherein the adding amounts of the active diluent monomer and the initiator are respectively 15-25 wt% and 0.1-0.2 wt% of the polyurethane acrylate prepolymer;
(4) coating and curing: and coating the water-based plastic substitute plastic on a base material, and curing under ultraviolet irradiation to form a glue film.
2. The coating process of claim 1, wherein the coating process comprises: the first catalyst and the second catalyst are both organic tin catalysts, and the addition amount of the first catalyst is 0.05-0.1% of the reaction monomer.
3. The coating process of claim 1, wherein the coating process comprises: the addition amount of the dimethylbenzene is 3-5% of the reaction monomer.
4. The coating process of claim 1, wherein the coating process comprises: the molecular weight of the polyester polyol is 1500-.
5. The coating process of claim 1, wherein the coating process comprises: the hydrophilic chain extender is at least one of dimethylolpropionic acid, ethylene diamino ethyl sodium sulfonate and diethylenetriamine.
6. The coating process of claim 1, wherein the coating process comprises: the defoaming agent is a BYK defoaming agent.
7. The coating process of claim 1, wherein the coating process comprises: the neutralizing agent is triethylamine.
8. The coating process of claim 1, wherein the coating process comprises: the initiator is a photoinitiator TPO and/or a photoinitiator 184.
9. The coating process of claim 1, wherein the coating process comprises: the active dilution monomer is at least one of tripropylene glycol diacrylate, trimethylolpropane triacrylate and pentaerythritol triacrylate.
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