CN113308166B - High-adhesion anti-re-adhesion replacement plastic and preparation method thereof - Google Patents

High-adhesion anti-re-adhesion replacement plastic and preparation method thereof Download PDF

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CN113308166B
CN113308166B CN202110551130.4A CN202110551130A CN113308166B CN 113308166 B CN113308166 B CN 113308166B CN 202110551130 A CN202110551130 A CN 202110551130A CN 113308166 B CN113308166 B CN 113308166B
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adhesion
diacetone acrylamide
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acrylic acid
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CN113308166A (en
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赵建国
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Dongguan City Guanli Glue Industry Co ltd
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    • C09D133/00—Coating compositions based on 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

The invention relates to the technical field of paper-plastic processing, in particular to a high-adhesion anti-sticky alternative plastic and a preparation method thereof, and the preparation method comprises the following steps: (1) synthesizing a first acrylic emulsion; (2) synthesizing a second acrylic acid emulsion; (3) preparing high-adhesion anti-re-adhesion replacement plastic. The hard monomer methyl methacrylate content in the first acrylic emulsion is higher, so that the Tg of the copolymer is higher, and methyl acrylate with the Tg higher than that of butyl acrylate is also added into the soft monomer; the second acrylic emulsion of the invention has a moderate Tg point and good adhesion and film forming properties, but the film layer formed by the emulsion alone is weak in anti-tack property. The two acrylic acid emulsions are compounded for use, and the bridging of the two colloidal particles is realized by utilizing the crosslinking reaction of diacetone acrylamide and adipic dihydrazide, so that the molding continuity is improved, the adhesion performance is improved, and the anti-after-tack performance is also remarkably shown due to the fact that the whole has a higher Tg point.

Description

High-adhesion anti-re-adhesion replacement plastic and preparation method thereof
Technical Field
The invention relates to the technical field of paper-plastic processing, in particular to high-adhesion anti-sticky replacement plastic and a preparation method thereof.
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 the high-adhesion anti-sticking plastic and the preparation method thereof, and the water-based paint is adopted to replace the traditional glue film coating technology.
The purpose of the invention is realized by the following technical scheme:
a preparation method of high-adhesion anti-re-adhesion replacement plastic comprises the following steps:
(1) synthesis of the first acrylic emulsion: weighing the following raw materials in percentage by mass: 30-40% of methyl methacrylate, 10-15% of butyl acrylate, 5-10% of methyl acrylate, 3-7% of acrylic acid, 1-3% of diacetone acrylamide, 0.6-1% of initiator, 1-3% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and part of the initiator, adding part of the methyl methacrylate, part of the butyl acrylate, part of the methyl acrylate, part of the acrylic acid and part of the diacetone acrylamide, heating to 80-85 ℃, reacting for 30-50min, dropwise adding the rest of the methyl acrylate, the rest of the butyl acrylate, the rest of the acrylic acid, the rest of the diacetone acrylamide and the rest of the initiator, continuously reacting for 2-4h under heat preservation after dropwise adding is finished, and then cooling to room temperature to obtain a first acrylic emulsion;
(2) synthesis of second acrylic emulsion: weighing the following raw materials in percentage by mass: 30-35% of methyl methacrylate, 25-30% of butyl acrylate, 3-7% of acrylic acid, 2-4% of diacetone acrylamide, 0.6-1% of initiator, 1-3% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and part of the initiator, adding part of the methyl methacrylate, part of the butyl acrylate, part of the acrylic acid and part of the diacetone acrylamide, heating to 80-85 ℃, reacting for 30-40min, dropwise adding the rest of the methyl methacrylate, the rest of the butyl acrylate, the rest of the acrylic acid, the rest of the diacetone acrylamide and the rest of the initiator, continuing to perform heat preservation reaction for 2-4h after dropwise adding is completed, and then cooling to room temperature to obtain a second acrylic acid emulsion;
(3) preparing high-adhesion anti-re-adhesion replacement plastic: and mixing the first acrylic emulsion and the second acrylic emulsion according to the mass ratio of 4-5:5-6, uniformly stirring, adding a neutralizing agent to adjust the pH value to 7-8, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the high-adhesion anti-tack plastic.
The high-adhesion anti-after-tack replacement plastic disclosed by the invention is an emulsion type acrylic resin coating, in the emulsion type acrylic resin coating, the variety and the using amount of monomers determine various performances of an emulsion and a film, methyl methacrylate is a hard monomer and endows the film with hardness and tensile strength, butyl acrylate and methyl acrylate are soft monomers and endows the film with adhesiveness and flexibility, acrylic acid is a functional monomer and provides a crosslinking point to promote polymerization reaction, diacetone acrylamide is a functional monomer and is matched with adipyl to be used, and the functional monomer and the adipyl are subjected to crosslinking reaction in a curing process to form a crosslinked network structure, so that the film forming temperature is reduced, and the water resistance and the hardness of the film are improved. Generally, the use of various monomers is formulated according to the performance requirements of an emulsion and a film layer, it is not necessary to use two kinds of polymerization emulsions for blending modification, emulsion particles need to be mutually permeated and dissolved in the curing process of the film layer, and two different polymers are easy to generate the phenomenon of phase separation, which is not favorable for the continuity of the film layer. However, the high adhesion and the anti-tack property of the film layer are two contradictory properties, the high adhesion generally requires the copolymer to have a lower Tg, the anti-tack property generally requires the copolymer to have a higher Tg, and a single emulsion synthesized by blending the soft and hard monomers by a conventional method is difficult to have both the adhesion and the anti-tack property.
According to the invention, the hard monomer methyl methacrylate content in the first acrylic emulsion is higher, so that the Tg of the copolymer is higher, methyl acrylate with the Tg higher than that of butyl acrylate is also added into the soft monomer, the Tg point is further increased, and the adhesion of a film layer is improved at the same time, but although diacetone acrylamide is added to reduce the film forming temperature, the film forming property of the emulsion for independently forming a film is still poorer; the proportion of the hard monomer methyl methacrylate and the soft monomer butyl acrylate of the second acrylic emulsion is still higher than that of common latex, the second acrylic emulsion is moderate compared with the first acrylic emulsion, the diacetone acrylamide is added to reduce the film forming temperature, the copolymer has moderate Tg point and good adhesiveness and film forming property, but the anti-tack property of a film layer formed by the emulsion alone is weaker. The two acrylic acid emulsions are compounded for use, and the bridging of the two colloidal particles is realized by utilizing the crosslinking reaction of diacetone acrylamide and adipic dihydrazide, so that the molding continuity is improved, the adhesion performance is improved, and the anti-after-tack performance is also remarkably shown due to the fact that the whole has a higher Tg point.
Because the steric effect of the formed polymer molecules can be increased along with the increase of the content of hard monomer methyl methacrylate to hinder the crosslinking reaction of diacetone acrylamide and adipic dihydrazide, the improvement of the hardness and the film forming property of the diacetone acrylamide are not obvious, in the invention, the content of the diacetone acrylamide of the first acrylic emulsion is lower than that of the diacetone acrylamide of the second acrylic emulsion, so that the diacetone acrylamide in the first acrylic emulsion has weak contribution to the mechanical property and mainly has the function of bridging with colloidal particles of the first acrylic emulsion to improve the continuity of film forming, and the diacetone acrylamide in the second acrylic emulsion has sufficient crosslinking reaction, so that the film forming temperature can be reduced better, and the anti-sticking property can be improved along with the increase of the crosslinking structure. Compared with a system for directly preparing the first acrylic emulsion and the second acrylic emulsion, the invention has higher utilization efficiency of diacetone acrylamide, so that the finally formed film has better adhesiveness and better anti-after-tack performance, and also has better mechanical performance.
Wherein the initiator is at least one of ammonium persulfate, potassium persulfate and dibenzoyl peroxide. Preferably, the initiator is ammonium persulfate, so that the cost is low.
Wherein the emulsifier consists of SDS and OP-10 according to the weight ratio of 4-6: 3. SDS is anionic surfactant, OP-10 is nonionic surfactant, the emulsifying capacity of anionic surfactant is better, but the emulsifying stability of nonionic surfactant is better, through the appropriate combination of the two, the storage stability of emulsion particles can be better improved.
Wherein the neutralizing agent is diluted ammonia water and/or triethanolamine.
And (3) adding an auxiliary agent before adding the neutralizing agent, wherein the auxiliary agent is at least one of a flatting agent, a brightening agent, an abrasion-resistant auxiliary agent and a rheological agent.
Wherein, the specific operation of synthesizing the first acrylic emulsion in the step (1) is as follows: weighing the following raw materials in percentage by mass: 30-40% of methyl methacrylate, 10-15% of butyl acrylate, 5-10% of methyl acrylate, 3-7% of acrylic acid, 1-3% of diacetone acrylamide, 0.6-1% of initiator, 1-3% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and 1/2 initiator accounting for the total mass of the initiator, adding 1/3% of methyl methacrylate, 1/3% of butyl acrylate, 1/3% of methyl acrylate, 1/3% of acrylic acid and 1/3% of diacetone acrylamide accounting for the total mass of the acrylic acid under the stirring condition of keeping 300-350r/min, heating to 80-85 ℃, after reacting for 30-50min, dropwise adding the residual methyl methacrylate, the residual butyl acrylate, the residual methyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator, continuing to perform heat preservation reaction for 2-4h after dropwise adding is completed, and then cooling to room temperature to obtain the first acrylic emulsion.
Wherein the specific operation of the (2) second acrylic emulsion synthesis comprises the following steps: weighing the following raw materials in percentage by mass: 30-35% of methyl methacrylate, 25-30% of butyl acrylate, 3-7% of acrylic acid, 2-4% of diacetone acrylamide, 0.6-1% of initiator, 1-3% of emulsifier and the balance of water, wherein after the water, the emulsifier and the initiator 1/2 which accounts for the total mass of the initiator are uniformly mixed, 1/3% of methyl methacrylate, 1/3% of butyl acrylate, 1/3% of acrylic acid and 1/3% of diacetone acrylamide which accounts for the total mass of the diacetone acrylamide are added under the stirring condition of keeping 300-350r/min, then the temperature is increased to 80-85 ℃, after 30-40min of reaction, the rest of methyl methacrylate, the rest of butyl acrylate, the rest of diacetone acrylamide are added dropwise, And (3) continuously preserving the temperature and reacting for 2-4h after the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, and then cooling to room temperature to obtain a second acrylic acid emulsion.
The polymerization reaction can be facilitated by controlling the stirring speed and controlling the amount of the monomer to be added in several portions.
Wherein, in the step (3), the adding molar quantity of the adipic dihydrazide is 0.8-1.2 times of the sum of the adding molar quantities of the diacetone acrylamide of the first acrylic emulsion and the second acrylic emulsion.
The invention has the beneficial effects that: according to the invention, the content of hard monomer methyl methacrylate in the first acrylic emulsion is higher, so that the Tg of the copolymer is higher, methyl acrylate with the Tg higher than that of butyl acrylate is also added into the soft monomer, the Tg point is further improved, and the adhesion of a film layer is improved at the same time, but although diacetone acrylamide is added to reduce the film forming temperature, the film forming property of the emulsion for forming a film independently is still poor; the proportion of the hard monomer methyl methacrylate and the soft monomer butyl acrylate of the second acrylic acid emulsion is still higher than that of the common latex, the second acrylic acid emulsion is moderate compared with the first acrylic acid emulsion, the diacetone acrylamide is also added to reduce the film forming temperature, the copolymer has moderate Tg point and good adhesiveness and film forming property, but the film layer formed by the emulsion alone is weaker in anti-tack property. The two acrylic acid emulsions are compounded for use, and the bridging of the two colloidal particles is realized by utilizing the crosslinking reaction of diacetone acrylamide and adipic dihydrazide, so that the molding continuity is improved, the adhesion performance is improved, and the anti-after-tack performance is also remarkably shown due to the fact that the whole has a higher Tg point.
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-adhesion anti-re-adhesion replacement plastic comprises the following steps:
(1) synthesis of the first acrylic emulsion: weighing the following raw materials in percentage by mass: weighing the following raw materials in percentage by mass: 35 percent of methyl methacrylate, 12.5 percent of butyl acrylate, 7.5 percent of methyl acrylate, 5 percent of acrylic acid, 2 percent of diacetone acrylamide, 0.8 percent of initiator, 2 percent of emulsifier and the balance of water, evenly mixing the water, the emulsifier and 1/2 percent of initiator accounting for the total mass of the initiator, adding 1/3 percent of methyl methacrylate accounting for the total mass of methyl methacrylate, 1/3 percent of butyl acrylate accounting for the total mass of butyl acrylate, 1/3 percent of methyl acrylate accounting for the total mass of methyl acrylate, 1/3 percent of acrylic acid accounting for the total mass of acrylic acid and 1/3 percent of diacetone acrylamide accounting for the total mass of diacetone acrylamide under the stirring condition of maintaining 325r/min, then heating to 80 ℃, reacting for 40min, and then dropwise adding the rest of methyl methacrylate, the rest of butyl acrylate, the rest of methyl acrylate, After the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, continuing to perform heat preservation reaction for 3 hours, and then cooling to room temperature to obtain a first acrylic emulsion;
(2) synthesis of second acrylic emulsion: weighing the following raw materials in percentage by mass: 32.5 percent of methyl methacrylate, 27.5 percent of butyl acrylate, 5 percent of acrylic acid, 3 percent of diacetone acrylamide, 0.8 percent of initiator, 2 percent of emulsifier and the balance of water, after uniformly mixing the water, the emulsifier and the initiator 1/2 which accounts for the total mass of the initiator, under the stirring condition of maintaining 325r/min, 1/3 percent of methyl methacrylate which accounts for the total mass of the methyl methacrylate, 1/3 percent of butyl acrylate which accounts for the total mass of the butyl acrylate, 1/3 percent of acrylic acid which accounts for the total mass of the acrylic acid and 1/3 percent of diacetone acrylamide which accounts for the total mass of the diacetone acrylamide are added, then the temperature is increased to 80 ℃, after 35min of reaction, the residual methyl methacrylate, the residual butyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, the heat preservation reaction is continued for 3h after the dropwise addition is completed, then cooling to room temperature to obtain a second acrylic emulsion;
(3) preparing high-adhesion anti-re-adhesion replacement plastic: and mixing the first acrylic emulsion and the second acrylic emulsion according to the mass ratio of 45:55, uniformly stirring, adding a neutralizing agent to adjust the pH value to 7, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the high-adhesion anti-re-adhesion plastic.
Wherein the initiator is ammonium persulfate.
Wherein the emulsifier consists of SDS and OP-10 according to the weight ratio of 5: 3.
Wherein the neutralizer is diluted ammonia water.
Wherein, in the step (3), the adding molar quantity of the adipic dihydrazide is 1.0 time of the sum of the adding molar quantities of the diacetone acrylamide of the first acrylic emulsion and the second acrylic emulsion.
Example 2
A preparation method of high-adhesion anti-re-adhesion replacement plastic comprises the following steps:
(1) synthesis of the first acrylic emulsion: weighing the following raw materials in percentage by mass: 30% of methyl methacrylate, 10% of butyl acrylate, 5% of methyl acrylate, 3% of acrylic acid, 1% of diacetone acrylamide, 0.6% of initiator, 1% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and the initiator 1/2 in terms of the total mass of the initiator, adding 1/3% of methyl methacrylate in terms of the total mass of methyl methacrylate, 1/3% of butyl acrylate in terms of the total mass of butyl acrylate, 1/3% of methyl acrylate in terms of the total mass of methyl acrylate, 1/3% of acrylic acid in terms of the total mass of acrylic acid and 1/3% of diacetone acrylamide in terms of the total mass of diacetone acrylamide under the stirring condition of keeping 300r/min, heating to 83 ℃, reacting for 30min, and then dropwise adding the rest of methyl methacrylate, the rest of butyl acrylate, the rest of methyl acrylate, the rest of diacetone acrylamide in terms of the total mass of 1/3-, After the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, continuing to perform heat preservation reaction for 2 hours, and then cooling to room temperature to obtain a first acrylic emulsion;
(2) synthesis of second acrylic emulsion: weighing the following raw materials in percentage by mass: 30% of methyl methacrylate, 25% of butyl acrylate, 3% of acrylic acid, 2% of diacetone acrylamide, 0.6% of initiator, 1% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and 1/2% of initiator which accounts for the total mass of the initiator, adding 1/3% of methyl methacrylate which accounts for the total mass of methyl methacrylate, 1/3% of butyl acrylate which accounts for the total mass of butyl acrylate, 1/3% of acrylic acid which accounts for the total mass of acrylic acid and 1/3% of diacetone acrylamide which accounts for the total mass of diacetone acrylamide under the stirring condition of keeping 300r/min, heating to 82 ℃, reacting for 30min, dropwise adding the residual methyl methacrylate, the residual butyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator, and continuing to perform heat preservation reaction for 2h after dropwise adding is completed, then cooling to room temperature to obtain a second acrylic acid emulsion;
(3) preparing high-adhesion anti-re-adhesion replacement plastic: and mixing the first acrylic emulsion and the second acrylic emulsion according to the mass ratio of 4:6, uniformly stirring, adding a neutralizing agent to adjust the pH value to 7.5, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the high-adhesion anti-re-adhesion plastic.
Wherein the initiator is potassium persulfate.
Wherein the emulsifier consists of SDS and OP-10 according to the weight ratio of 4: 3.
Wherein the neutralizing agent is triethanolamine.
And (3) adding an auxiliary agent before adding the neutralizing agent, wherein the auxiliary agent is a flatting agent, a brightening agent, a wear-resistant auxiliary agent and a rheological agent.
Wherein, in the step (3), the adding molar quantity of the adipic dihydrazide is 0.8 times of the sum of the adding molar quantities of the diacetone acrylamide of the first acrylic emulsion and the second acrylic emulsion.
Example 3
A preparation method of high-adhesion anti-re-adhesion replacement plastic comprises the following steps:
(1) synthesis of the first acrylic emulsion: weighing the following raw materials in percentage by mass: 40% of methyl methacrylate, 15% of butyl acrylate, 10% of methyl acrylate, 7% of acrylic acid, 1-3% of diacetone acrylamide, 1% of initiator, 3% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and the initiator 1/2 which accounts for the total mass of the initiator, adding 1/3% of methyl methacrylate which accounts for the total mass of methyl methacrylate, 1/3% of butyl acrylate which accounts for the total mass of butyl acrylate, 1/3% of methyl acrylate which accounts for the total mass of methyl acrylate, 1/3% of acrylic acid which accounts for the total mass of acrylic acid and 1/3% of diacetone acrylamide which accounts for the total mass of diacetone acrylamide under the stirring condition of keeping 350r/min, then heating to 85 ℃, reacting for 50min, and then dropwise adding the rest of methyl methacrylate, the rest of butyl acrylate, the rest of diacetone acrylamide, After the residual methyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, continuing to perform heat preservation reaction for 4 hours, and then cooling to room temperature to obtain a first acrylic emulsion;
(2) synthesis of second acrylic emulsion: weighing the following raw materials in percentage by mass: 35% of methyl methacrylate, 30% of butyl acrylate, 7% of acrylic acid, 4% of diacetone acrylamide, 1% of initiator, 3% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and 1/2% of initiator which accounts for the total mass of the initiator, adding 1/3% of methyl methacrylate which accounts for the total mass of methyl methacrylate, 1/3% of butyl acrylate which accounts for the total mass of butyl acrylate, 1/3% of acrylic acid which accounts for the total mass of acrylic acid and 1/3% of diacetone acrylamide which accounts for the total mass of diacetone acrylamide under the stirring condition of keeping 350r/min, heating to 85 ℃, reacting for 40min, dropwise adding the residual methyl methacrylate, the residual butyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator, and continuing the heat preservation reaction for 4h after dropwise adding, then cooling to room temperature to obtain a second acrylic acid emulsion;
(3) preparing high-adhesion anti-re-adhesion replacement plastic: and mixing the first acrylic emulsion and the second acrylic emulsion according to the mass ratio of 5:5, uniformly stirring, adding a neutralizing agent to adjust the pH value to 8, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the high-adhesion anti-re-adhesion plastic cement.
Wherein the initiator is ammonium persulfate.
Wherein the emulsifier consists of SDS and OP-10 according to the weight ratio of 6: 3.
Wherein the neutralizer is diluted ammonia water.
And (3) adding an auxiliary agent before adding the neutralizing agent, wherein the auxiliary agent is a flatting agent, a brightening agent, a wear-resistant auxiliary agent and a rheological agent.
Wherein, in the step (3), the adding molar quantity of the adipic dihydrazide is 1.2 times of the sum of the adding molar quantities of the diacetone acrylamide of the first acrylic emulsion and the second acrylic emulsion.
Comparative example 1
A preparation method of a plastic substitute comprises the following steps:
weighing the following raw materials in percentage by mass: weighing the following raw materials in percentage by mass: 35 percent of methyl methacrylate, 12.5 percent of butyl acrylate, 7.5 percent of methyl acrylate, 5 percent of acrylic acid, 2 percent of diacetone acrylamide, 0.8 percent of initiator, 2 percent of emulsifier and the balance of water, after uniformly mixing the water, the emulsifier and 1/2 percent of initiator accounting for the total mass of the initiator, 1/3 percent of methyl methacrylate accounting for the total mass of methyl methacrylate, 1/3 percent of butyl acrylate accounting for the total mass of butyl acrylate, 1/3 percent of methyl acrylate accounting for the total mass of methyl acrylate, 1/3 percent of acrylic acid accounting for the total mass of acrylic acid and 1/3 percent of diacetone acrylamide accounting for the total mass of diacetone acrylamide are added under the stirring condition of keeping 325r/min, then the temperature is raised to 80 ℃, and after 40min of reaction, the rest of methyl methacrylate, the rest of butyl acrylate, the rest of methyl acrylate, the diacetone acrylamide are added dropwise, And (3) continuously carrying out heat preservation reaction for 3h after the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, then cooling to room temperature, adding a neutralizing agent to adjust the pH value to 7, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the plastic substitute.
Comparative example 2
A preparation method of a plastic substitute comprises the following steps:
weighing the following raw materials in percentage by mass: 32.5 percent of methyl methacrylate, 27.5 percent of butyl acrylate, 5 percent of acrylic acid, 3 percent of diacetone acrylamide, 0.8 percent of initiator, 2 percent of emulsifier and the balance of water, after uniformly mixing the water, the emulsifier and the initiator 1/2 which accounts for the total mass of the initiator, under the stirring condition of maintaining 325r/min, 1/3 percent of methyl methacrylate which accounts for the total mass of the methyl methacrylate, 1/3 percent of butyl acrylate which accounts for the total mass of the butyl acrylate, 1/3 percent of acrylic acid which accounts for the total mass of the acrylic acid and 1/3 percent of diacetone acrylamide which accounts for the total mass of the diacetone acrylamide are added, then the temperature is increased to 80 ℃, after 35min of reaction, the residual methyl methacrylate, the residual butyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, the heat preservation reaction is continued for 3h after the dropwise addition is completed, and then cooling to room temperature, adding a neutralizing agent to adjust the pH value to 7, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the plastic substitute.
Comparative example 3
The preparation method of the plastic substitute comprises the following steps:
weighing the following raw materials in percentage by mass: 35% of methyl methacrylate, 25% of butyl acrylate, 5% of acrylic acid, 3% of diacetone acrylamide, 0.8% of initiator, 2% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and 1/2% of initiator which accounts for the total mass of the initiator, adding 1/3% of methyl methacrylate which accounts for the total mass of methyl methacrylate, 1/3% of butyl acrylate which accounts for the total mass of butyl acrylate, 1/3% of acrylic acid which accounts for the total mass of acrylic acid and 1/3% of diacetone acrylamide which accounts for the total mass of diacetone acrylamide under the stirring condition of 325r/min, heating to 80 ℃, reacting for 35min, dropwise adding the residual methyl methacrylate, the residual butyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator, and continuing the heat preservation reaction for 3h after dropwise adding, and then cooling to room temperature, adding a neutralizing agent to adjust the pH value to 7, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the plastic substitute.
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 adhesiveness: solidifying the replacement plastic on gray cardboard, adhering the replacement plastic 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;
blocking resistance of the film layer: curing the substitute plastic on gray card paper, cutting two paper boards with the thickness of 7cm by 7cm, attaching the printing surfaces of the two paper boards, pressing the two paper boards by using a 4kg weight, placing the two paper boards in an environment with the temperature of 60 ℃ and the RH percent of 90% for 240 hours, and judging that the film passes the anti-adhesion test if the film layer does not have the adhesion phenomenon;
example 1 Comparative example 1 Comparative example 2 Comparative example 3
Hardness of film layer 3H 5H 2H 3H
Film adhesion By passing Do not pass through By passing By passing
Blocking resistance of film layer By passing By passing Do not pass through 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 (6)

1. A preparation method of high-adhesion anti-re-adhesion replacement plastic is characterized by comprising the following steps: the method comprises the following steps:
(1) synthesis of the first acrylic emulsion: weighing the following raw materials in percentage by mass: 30-40% of methyl methacrylate, 10-15% of butyl acrylate, 5-10% of methyl acrylate, 3-7% of acrylic acid, 1-3% of diacetone acrylamide, 0.6-1% of initiator, 1-3% of emulsifier and the balance of water, uniformly mixing the water, the emulsifier and 1/2 initiator accounting for the total mass of the initiator, adding 1/3% of methyl methacrylate, 1/3% of butyl acrylate, 1/3% of methyl acrylate, 1/3% of acrylic acid and 1/3% of diacetone acrylamide accounting for the total mass of the acrylic acid under the stirring condition of keeping 300-350r/min, heating to 80-85 ℃, after reacting for 30-50min, dropwise adding the residual methyl methacrylate, the residual butyl acrylate, the residual methyl acrylate, the residual acrylic acid, the residual diacetone acrylamide and the residual initiator, continuing to perform heat preservation reaction for 2-4h after dropwise adding is finished, and then cooling to room temperature to obtain a first acrylic emulsion;
(2) synthesis of second acrylic emulsion: weighing the following raw materials in percentage by mass: 30-35% of methyl methacrylate, 25-30% of butyl acrylate, 3-7% of acrylic acid, 2-4% of diacetone acrylamide, 0.6-1% of initiator, 1-3% of emulsifier and the balance of water, wherein after the water, the emulsifier and the initiator 1/2 which accounts for the total mass of the initiator are uniformly mixed, 1/3% of methyl methacrylate, 1/3% of butyl acrylate, 1/3% of acrylic acid and 1/3% of diacetone acrylamide which accounts for the total mass of the diacetone acrylamide are added under the stirring condition of keeping 300-350r/min, then the temperature is increased to 80-85 ℃, after 30-40min of reaction, the rest of methyl methacrylate, the rest of butyl acrylate, the rest of diacetone acrylamide are added dropwise, After the residual acrylic acid, the residual diacetone acrylamide and the residual initiator are added dropwise, continuing to perform heat preservation reaction for 2-4h, and then cooling to room temperature to obtain a second acrylic acid emulsion;
(3) preparing high-adhesion anti-re-adhesion replacement plastic: mixing the first acrylic emulsion and the second acrylic emulsion according to the mass ratio of 4-5:5-6, uniformly stirring, adding a neutralizing agent to adjust the pH value to 7-8, adding adipic dihydrazide, uniformly stirring, and filtering to obtain the high-adhesion anti-re-adhesion replacement plastic;
in the step (3), the adding molar quantity of the adipic dihydrazide is 0.8-1.2 times of the sum of the adding molar quantities of the diacetone acrylamide of the first acrylic emulsion and the second acrylic emulsion.
2. The method for preparing high-adhesion anti-sticking plastic cement according to 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 method for preparing high-adhesion anti-sticking plastic cement according to claim 1, wherein the method comprises the following steps: the emulsifier is composed of SDS and OP-10 according to the weight ratio of 4-6: 3.
4. The method for preparing high-adhesion anti-sticking plastic cement according to claim 1, wherein the method comprises the following steps: the neutralizing agent is diluted ammonia water and/or triethanolamine.
5. The method for preparing high-adhesion anti-sticking plastic cement according to claim 1, wherein the method comprises the following steps: in the step (3), an auxiliary agent is added before the neutralizing agent is added, wherein the auxiliary agent is at least one of a leveling agent, a brightening agent, a wear-resistant auxiliary agent and a rheological agent.
6. The high-adhesion anti-re-adhesion replacement plastic is characterized in that: the preparation method of the high-adhesion anti-sticking plastic cement as claimed in any one of claims 1 to 5.
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