CN113150477A - High-stability absorbent plastic and preparation method thereof - Google Patents
High-stability absorbent plastic and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L31/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
- C08L31/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C08L31/04—Homopolymers or copolymers of vinyl acetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/006—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00
- C08F283/008—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00 on to unsaturated polymers
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- 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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- 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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- 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
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/04—Polymer mixtures characterised by other features containing interpenetrating networks
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Abstract
The invention relates to the technical field of plastic-absorbing glue processing, in particular to a high-stability plastic-absorbing glue and a preparation method thereof, in the synthesis of polyurethane acrylate, an acrylate monomer is introduced into a polyurethane molecular chain, the hot tack of a copolymer can be improved, vinyl acetate can improve the compatibility of the polyurethane acrylate and a vinyl acetate-ethylene copolymer emulsion so that the polyurethane acrylate and the vinyl acetate-ethylene copolymer emulsion can be fully swelled and mixed, the stripping strength, the anti-tack property and the stability of a glue layer are improved by virtue of strong cohesive energy of the polyurethane acrylate, after the paper-based plastic-absorbing glue is coated and dried, the formed glue layer has low surface tack, the glue layer is not easy to adhere when being stacked, the structure of the glue layer is stable, the glue layer is not easy to age, and the glue layer does not have molecular migration caused by a plasticizer or an organic solvent, so that the plastic-absorbing glue still has the hot-melting adhesion capability after being placed for 3-6 months, and the bonding is firm.
Description
Technical Field
The invention relates to the technical field of plastic cement processing, in particular to a high-stability plastic cement and a preparation method thereof.
Background
Conventional vacuum-formed adhesives are widely used in the manufacture of computer tables, dressing tables, cabinets, door panels and furniture. The construction process comprises covering a PVC film on a density board which is dried after glue spraying, heating and softening PVC and activating plastic-absorbing glue through a vacuum plastic-absorbing machine, pumping air between the PVC film and the density board glue film by vacuum, and enabling the PVC film to be tightly adhered on the density board by virtue of atmospheric pressure.
In the field of paper-plastic packaging, paperboards such as Chinese white card/gold silver card/laser paper/white board paper and bubble shells such as PET/APET/PETG/PVC can also be bonded through absorbing plastic, and the packaging method is mainly applied to packaging industries such as toothbrushes, batteries, toys for children, electronic products, stationery, daily necessities and the like at present. But different from the traditional plastic uptake process, the plastic uptake glue in the paper-plastic package needs to be dried after the adhesive is coated on the paper, the paper products are stacked for convenient transportation, and then the paper products and the plastic shell are hot-pressed, plastic uptake and adhesion are carried out again. Therefore, the plastic absorbing material has the characteristics of anti-adhesion, avoiding adhesion when paper products are stacked, hot melting, secondary adhesion after hot melting, good adhesion performance and mechanical performance, and stability, can be placed for 3-6 months after being coated on paper, can be used for plastic absorbing and laminating, still keeps the adhesion force, and is more favorable for the connection of the working procedures. At present, the plastic is mainly polyurethane glue or vinyl acetate copolymer glue or blended latex of the polyurethane glue and the vinyl acetate copolymer glue, but the existing plastic cannot meet the use requirement.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a high-stability absorbent plastic and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a preparation method of high-stability absorbent plastic comprises the following steps:
(1) synthesis of urethane acrylate: weighing 13-15% of diisocyanate, 7-10% of polyester polyol, 6-8% of hydroxyethyl acrylate, 3-4% of vinyl acetate, 3-4% of butyl acrylate, 5-6% of methyl methacrylate, 1-2% of hydrophilic chain extender, 1-2% of small molecular chain extender, 0.01-0.5% of catalyst, 0.5-1.5% of neutralizer, 0.1-0.3% of defoamer, 0.05-0.1% of initiator and the balance of water according to the mass percentage, adding diisocyanate, polyester polyol and catalyst into a reaction kettle, heating to 80-90 ℃ and reacting for 1-3h, then adding hydroxyethyl acrylate, continuing to react for 1.5-2.5h at a constant temperature, cooling to 60-70 ℃ and adding chain extender and active diluent monomer, reacting for 1-2h at a constant temperature, cooling to 30-40 ℃, adding a neutralizing agent for neutralization, then cooling to normal temperature, adding a defoaming agent and water, stirring and emulsifying, adding an initiator, heating to 80-85 ℃, and carrying out heat preservation reaction for 3-4 hours to obtain the polyurethane acrylate;
(2) preparing high-stability absorbent plastic: and adding vinyl acetate-ethylene copolymer emulsion into the polyurethane acrylate, stirring and mixing to obtain the high-stability plastic absorbent, wherein the mass ratio of the polyurethane acrylate to the vinyl acetate-ethylene copolymer emulsion is 20-35: 65-80.
Polyurethanes are block copolymers in which isocyanates as hard blocks and polyols as soft blocks are alternately linked, so that the thermodynamic incompatibility of hard and soft blocks leads to microphase separation, and thus polyurethanes have a better balance of mechanical properties. As paper-based plastic absorbing materials, the polyurethane emulsion has high hot-melt temperature, so the paper-based plastic absorbing materials have good anti-after-tack performance, but do not have the condition of hot-melt adhesion; the vinyl acetate-ethylene copolymer emulsion has a lower Tg point, so that the water-based water-absorbent plastic disclosed by the invention has hot-melt adhesive property, good mechanical strength and anti-after-tack property by blending the vinyl acetate-ethylene copolymer emulsion and the polyurethane emulsion.
In addition, in the synthesis of polyurethane, the invention firstly synthesizes isocyanate-terminated polyurethane prepolymer by using excessive isocyanate, then the polyurethane prepolymer reacts with hydroxyl in hydroxyethyl acrylate to form polyurethane acrylate with carbon-carbon double bonds, and then the polyurethane acrylate with vinyl acetate, butyl acrylate and methyl methacrylate undergoes polymerization reaction by free radical initiation polymerization to form the polyurethane acrylate with interpenetrating network structure (IPN). The hydrophilic chain extender is introduced to polyurethane, so that the polyurethane acrylic prepolymer has the self-emulsifying characteristic, the polyurethane acrylic ester with a stable structure is formed by polymerization reaction with an acrylic ester monomer in a self-emulsifying system, the relative content of a soft monomer in the introduced acrylic ester monomer is higher, the heat tack of the copolymer can be improved, the introduced vinyl acetate also has a lower Tg point, and the compatibility of the polyurethane acrylic ester emulsion and the vinyl acetate-ethylene copolymer emulsion can be improved, so that the polyurethane acrylic ester and the vinyl acetate-ethylene copolymer emulsion can be fully swelled and mixed, the stripping strength, the anti-tack and the stability of an adhesive layer are improved by means of strong cohesive energy of the polyurethane acrylic ester, after the paper base is coated with the plastic uptake adhesive and dried, the surface tack of the formed adhesive layer is low, the adhesive layer is not easy to generate adhesion after being stacked, the structure of the adhesive layer is stable, and the adhesive layer is not easy to age, no plasticizer or organic solvent caused molecular migration, so that the adhesive still has the hot-melt adhesive bonding capability after being placed for 3-6 months and has firm bonding.
Wherein the initiator is at least one of ammonium persulfate, potassium persulfate and dibenzoyl peroxide. Preferably, the initiator is ammonium persulfate, and the water-soluble initiator is more compatible with aqueous systems.
Wherein the diisocyanate is isophorone diisocyanate.
Wherein the polyester polyol is 1, 4-butanediol adipate with the molecular weight of 1500-2500.
The hydrophilic chain extender is dimethylolpropionic acid, and the micromolecule chain extender is trimethylolpropane and/or 1, 4-butanediol. Preferably, the micromolecular chain extender is composed of trimethylolpropane and 1, 4-butanediol according to the weight ratio of 3:1, the property of a trimethylolpropane multifunctional group can enable a polyurethane molecular chain to form a cross-linking structure, the microphase separation degree is reduced, the 1, 4-butanediol can be embedded into a hard segment structure of isocyanate, the molecular weight is adjusted, and the stability of the polyurethane structure can be remarkably improved through the matching of the trimethylolpropane multifunctional group and the 1, 4-butanediol.
Wherein the catalyst is an organic tin catalyst.
Wherein the neutralizing agent is triethanolamine.
Wherein the defoaming agent is a BYK defoaming agent.
The vinyl acetate-ethylene copolymer emulsion is DA-102, has high solid content and low Tg point, and can improve the adhesion of the absorbent plastic.
The invention has the beneficial effects that:
the high-stability plastic absorbing material has hot melt adhesive property, good mechanical strength and anti-after-tack property by blending the vinyl acetate-ethylene copolymer emulsion and the polyurethane emulsion;
in addition, in the synthesis of polyurethane, the invention firstly synthesizes isocyanate-terminated polyurethane prepolymer by using excessive isocyanate, then the polyurethane prepolymer reacts with hydroxyl in hydroxyethyl acrylate to form polyurethane acrylate with carbon-carbon double bonds, and then the polyurethane acrylate with vinyl acetate, butyl acrylate and methyl methacrylate undergoes polymerization reaction by free radical initiation polymerization to form the polyurethane acrylate with interpenetrating network structure (IPN). The hydrophilic chain extender is introduced to polyurethane, so that the polyurethane acrylic prepolymer has the self-emulsifying characteristic, the polyurethane acrylic ester with a stable structure is formed by polymerization reaction with an acrylic ester monomer in a self-emulsifying system, the relative content of a soft monomer in the introduced acrylic ester monomer is higher, the heat tack of the copolymer can be improved, the introduced vinyl acetate also has a lower Tg point, and the compatibility of the polyurethane acrylic ester emulsion and the vinyl acetate-ethylene copolymer emulsion can be improved, so that the polyurethane acrylic ester and the vinyl acetate-ethylene copolymer emulsion can be fully swelled and mixed, the stripping strength, the anti-tack and the stability of an adhesive layer are improved by means of strong cohesive energy of the polyurethane acrylic ester, after the paper base is coated with the plastic uptake adhesive and dried, the surface tack of the formed adhesive layer is low, the adhesive layer is not easy to generate adhesion after being stacked, the structure of the adhesive layer is stable, and the adhesive layer is not easy to age, no plasticizer or organic solvent caused molecular migration, so that the adhesive still has the hot-melt adhesive bonding capability after being placed for 3-6 months and has firm bonding.
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 preparation method of high-stability absorbent plastic comprises the following steps:
(1) synthesis of urethane acrylate: weighing 14% of diisocyanate, 8.5% of polyester polyol, 7% of hydroxyethyl acrylate, 3.5% of vinyl acetate, 3.5% of butyl acrylate, 5.5% of methyl methacrylate, 1.5% of hydrophilic chain extender, 1.5% of micromolecular chain extender, 0.2% of catalyst, 1% of neutralizer, 0.2% of defoaming agent, 0.07% of initiator and the balance of water according to mass percentage, adding diisocyanate, polyester polyol and catalyst into a reaction kettle, heating to 85 ℃ and reacting for 2 hours, then adding hydroxyethyl acrylate, continuing to react for 2 hours under heat preservation, cooling to 65 ℃, adding a chain extender and an active diluent monomer, reacting for 1.5 hours under heat preservation, cooling to 35 ℃, adding a neutralizer for neutralization, then cooling to normal temperature, adding a defoaming agent and water, stirring and emulsifying, adding an initiator, heating to 83 ℃, and carrying out heat preservation reaction for 3.5 hours to obtain the polyurethane acrylate;
(2) preparing high-stability absorbent plastic: and adding vinyl acetate-ethylene copolymer emulsion into the polyurethane acrylate, stirring and mixing to obtain the high-stability plastic absorbent, wherein the mass ratio of the polyurethane acrylate to the vinyl acetate-ethylene copolymer emulsion is 30: 70.
Wherein the initiator is ammonium persulfate.
Wherein the diisocyanate is isophorone diisocyanate.
Wherein the polyester polyol is 1, 4-butanediol adipate with molecular weight of 2000.
The hydrophilic chain extender is dimethylolpropionic acid, and the micromolecule chain extender is composed of trimethylolpropane and 1, 4-butanediol according to the weight ratio of 3: 1.
Wherein the catalyst is an organic tin catalyst.
Wherein the neutralizing agent is triethanolamine.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the vinyl acetate-ethylene copolymer emulsion is Dalian chemical DA-102.
Example 2
A preparation method of high-stability absorbent plastic comprises the following steps:
(1) synthesis of urethane acrylate: weighing 13 percent of diisocyanate, 7 percent of polyester polyol, 6 percent of hydroxyethyl acrylate, 3 percent of vinyl acetate, 3 percent of butyl acrylate, 5 percent of methyl methacrylate, 1 percent of hydrophilic chain extender, 1 percent of micromolecular chain extender, 0.01 percent of catalyst, 0.5 percent of neutralizing agent, 0.1 percent of defoaming agent, 0.05 percent of initiator and the balance of water according to mass percentage, adding diisocyanate, polyester polyol and catalyst into a reaction kettle, heating to 80 ℃ and reacting for 1h, then adding hydroxyethyl acrylate, continuing to react for 1.5h under heat preservation, cooling to 60 ℃, adding a chain extender and an active diluent monomer, reacting for 1h under heat preservation, cooling to 30 ℃, adding a neutralizer for neutralization, then cooling to normal temperature, adding a defoaming agent and water, stirring and emulsifying, adding an initiator, heating to 80 ℃, and carrying out heat preservation reaction for 3 hours to obtain the polyurethane acrylate;
(2) preparing high-stability absorbent plastic: and adding vinyl acetate-ethylene copolymer emulsion into the polyurethane acrylate, stirring and mixing to obtain the high-stability plastic absorbent, wherein the mass ratio of the polyurethane acrylate to the vinyl acetate-ethylene copolymer emulsion is 20: 80.
Wherein the initiator is potassium sulfate.
Wherein the diisocyanate is isophorone diisocyanate.
Wherein the polyester polyol is 1, 4-butanediol adipate, and the molecular weight is 1500.
The hydrophilic chain extender is dimethylolpropionic acid, and the micromolecule chain extender is trimethylolpropane.
Wherein the catalyst is an organic tin catalyst.
Wherein the neutralizing agent is triethanolamine.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the vinyl acetate-ethylene copolymer emulsion is Dalian chemical DA-102.
Example 3
A preparation method of high-stability absorbent plastic comprises the following steps:
(1) synthesis of urethane acrylate: weighing 15 percent of diisocyanate, 10 percent of polyester polyol, 8 percent of hydroxyethyl acrylate, 4 percent of vinyl acetate, 4 percent of butyl acrylate, 6 percent of methyl methacrylate, 2 percent of hydrophilic chain extender, 2 percent of micromolecular chain extender, 0.5 percent of catalyst, 1.5 percent of neutralizer, 0.3 percent of defoaming agent, 0.1 percent of initiator and the balance of water according to mass percentage, adding diisocyanate, polyester polyol and catalyst into a reaction kettle, heating to 90 ℃, reacting for 3 hours, then adding hydroxyethyl acrylate, continuing to react for 2.5h under heat preservation, cooling to 70 ℃, adding a chain extender and an active diluent monomer, reacting for 2h under heat preservation, cooling to 40 ℃, adding a neutralizer for neutralization, then cooling to normal temperature, adding a defoaming agent and water, stirring and emulsifying, adding an initiator, heating to 85 ℃, and carrying out heat preservation reaction for 4 hours to obtain the polyurethane acrylate;
(2) preparing high-stability absorbent plastic: and adding a vinyl acetate-ethylene copolymer emulsion into the polyurethane acrylate, stirring and mixing to obtain the high-stability plastic absorbent, wherein the mass ratio of the polyurethane acrylate to the vinyl acetate-ethylene copolymer emulsion is 35: 65.
Wherein the initiator is dibenzoyl peroxide.
Wherein the diisocyanate is isophorone diisocyanate.
Wherein the polyester polyol is 1, 4-butanediol adipate, and the molecular weight is 2500.
The hydrophilic chain extender is dimethylolpropionic acid, and the micromolecule chain extender is 1, 4-butanediol.
Wherein the catalyst is an organic tin catalyst.
Wherein the neutralizing agent is triethanolamine.
Wherein the defoaming agent is a BYK defoaming agent.
Wherein the vinyl acetate-ethylene copolymer emulsion is Dalian chemical DA-102.
Comparative example 1
The absorbent plastic of this comparative example was the urethane acrylate prepared in example 1.
Comparative example 2
The absorbent plastic of this comparative example was Dalian chemical DA-102.
Comparative example 3
The plastic uptake adhesive of the comparative example is prepared by blending polyurethane emulsion and vinyl acetate-ethylene copolymer emulsion, the mass ratio is 35:65, the vinyl acetate-ethylene copolymer is DA-102, and the polyurethane emulsion is prepared by the following method:
weighing 14% of isophorone diisocyanate, 18% of poly adipic acid 1, 4-butanediol ester, 1% of chain extender, 0.01% of catalyst, 1% of neutralizer, 0.1% of defoaming agent and the balance of water according to mass percentage, adding diisocyanate, polyester polyol and catalyst into a reaction kettle, heating to 80 ℃, reacting for 3 hours, cooling to 60 ℃, adding the chain extender, reacting for 0.5 hour under heat preservation, cooling to 30 ℃, adding the neutralizing agent for neutralization, cooling to normal temperature, adding the defoaming agent and water, stirring and mixing to obtain the polyurethane emulsion.
The use method of the plastic uptake adhesive comprises the following steps: coating plastic absorbing plastic on the base material, drying at 60 ℃ for 20min, then attaching the bonded body, and carrying out plastic suction and hot pressing at 120 ℃ for 4s to finish bonding.
The performance of the plastic uptake adhesive of the embodiment 1 and the comparative examples 1 to 3 of the invention is tested, and the test method is as follows:
anti-tack property: coating plastic absorbing materials on gray card paper, drying at 60 ℃ for 20min, cutting two paper boards of 7cm by 7cm, attaching the printing surfaces of the two paper boards, pressing the two paper boards by a weight of 4kg, placing the two paper boards in an environment of 60 ℃ and 90 RH% for 240h, and judging that the film passes the anti-blocking test if the film layer does not have the adhesion phenomenon;
peel strength: referring to GB/T2791-1995, a plastic absorbent is coated on 200mm 25mm PVC, dried at 60 ℃ for 20min, then the two coated sides of PVC are attached and subjected to vacuum hot pressing at 120 ℃ for 4s, and then the peel strength is tested.
Stability: according to GB/T2791-1995, a plastic absorbent is coated on PVC of 200mm × 25mm, dried at 60 ℃ for 20min, left to stand for 1, 3, 6 months under natural conditions, then the two coated sides of PVC are attached and subjected to vacuum hot pressing at 120 ℃ for 4s, and then the peel strength is tested.
The test results are given in the following table:
| example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Anti-tack property | By passing | By passing | Do not pass through | By passing |
| Peel strength | 13.5 | 8.8 | 8.1 | 6.5 |
| Peel strength (standing for 1 month) | 12.1 | 8.1 | 7.2 | 5.8 |
| Peel strength (standing for 3 months) | 10.9 | 6.3 | 4.9 | 4.8 |
| Peel strength (standing for 6 months) | 9.2 | 4.8 | 3.5 | 4.1 |
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 preparation method of high-stability absorbent plastic is characterized by comprising the following steps: the method comprises the following steps:
(1) synthesis of urethane acrylate: weighing 13-15% of diisocyanate, 7-10% of polyester polyol, 6-8% of hydroxyethyl acrylate, 3-4% of vinyl acetate, 3-4% of butyl acrylate, 5-6% of methyl methacrylate, 1-2% of chain extender, 0.01-0.5% of catalyst, 0.5-1.5% of neutralizer, 0.1-0.3% of defoaming agent, 0.05-0.1% of initiator and the balance of water according to mass percentage, adding diisocyanate, polyester polyol and catalyst into a reaction kettle, heating to 80-90 ℃ and reacting for 1-3h, then adding hydroxyethyl acrylate, continuing to perform heat preservation reaction for 1.5-2.5h, cooling to 60-70 ℃ and adding chain extender and active diluent monomer, performing heat preservation reaction for 1-2h, cooling to 30-40 ℃, adding neutralizer for neutralization, then cooling to normal temperature, adding a defoaming agent and water, stirring and emulsifying, adding an initiator, heating to 80-85 ℃, and carrying out heat preservation reaction for 3-4 hours to obtain the polyurethane acrylate;
(2) preparing high-stability absorbent plastic: and adding vinyl acetate-ethylene copolymer emulsion into the polyurethane acrylate, stirring and mixing to obtain the high-stability plastic absorbent, wherein the mass ratio of the polyurethane acrylate to the vinyl acetate-ethylene copolymer emulsion is 20-35: 65-80.
2. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the initiator is at least one of ammonium persulfate, potassium persulfate and dibenzoyl peroxide.
3. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the diisocyanate is isophorone diisocyanate.
4. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the polyester polyol is 1, 4-butanediol adipate with the molecular weight of 1500-.
5. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the hydrophilic chain extender is dimethylolpropionic acid, and the micromolecule chain extender is trimethylolpropane and/or 1, 4-butanediol.
6. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the catalyst is an organic tin catalyst.
7. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the neutralizing agent is triethanolamine.
8. The preparation method of the high-stability absorbent plastic as claimed in claim 1, wherein the method comprises the following steps: the defoaming agent is a BYK defoaming agent.
9. The high-stability plastic suction rubber is characterized in that: the high-stability absorbent plastic of any one of claims 1-8.
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