CN114940881A - High-solid low-viscosity pressure-sensitive adhesive for anilox roller - Google Patents
High-solid low-viscosity pressure-sensitive adhesive for anilox roller Download PDFInfo
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- CN114940881A CN114940881A CN202210771632.2A CN202210771632A CN114940881A CN 114940881 A CN114940881 A CN 114940881A CN 202210771632 A CN202210771632 A CN 202210771632A CN 114940881 A CN114940881 A CN 114940881A
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives 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; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
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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
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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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
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
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Abstract
The invention discloses a high-solid low-viscosity pressure-sensitive adhesive for an anilox roller, which comprises the following raw materials in parts by weight: 70-90 parts of a soft monomer; 10-20 parts of a hard monomer; 4-10 parts of functional monomer; 0.2-0.7 part of an initiator; 1-3 parts of an emulsifier; 0.1-0.2 parts of a buffering agent; 60-80 parts of deionized water. The high-solid low-viscosity pressure-sensitive adhesive for the anilox roller has excellent bonding performance, takes water as a medium in the production process, does not use a volatile organic solvent, is safe in production, does not cause environmental pollution, has the characteristics of high solid low viscosity, and can fully meet the use requirements on glue in the anilox roller coating process.
Description
Technical Field
The invention relates to the technical field of pressure-sensitive adhesives, in particular to a high-solid low-viscosity pressure-sensitive adhesive for an anilox roller.
Background
At present, in China, the solvent type acrylate pressure-sensitive adhesive which is not environment-friendly and has lower production safety coefficient is mainly used for producing the acrylate pressure-sensitive adhesive for labels. With the improvement of environmental protection importance in international large environment, the pressure-sensitive adhesive for the emulsion type label gradually occupies the market.
Patent publication numbers in the prior art are as follows: CN 112961629A, the invention discloses an acrylic ester pressure-sensitive adhesive emulsion which can be repeatedly pasted, in particular to be applied to sticky notes (Yoshidai, N-time stickers), a preparation method and an application thereof, wherein the preparation method comprises the following steps: preparing a mixed monomer A and a mixed monomer B containing an initiator and an anionic emulsifier according to a predetermined proportion, and respectively dropwise adding the mixed monomer A, B into a substrate containing a polymer emulsifier and an anionic emulsifier for reaction at a certain temperature according to a specified time; the emulsion prepared by the method can be repeatedly peeled and pasted after application, the bonding strength cannot be obviously reduced, the peeling and transferring process cannot be degummed, the bonding strength cannot be obviously increased after long-time pressing, and the conditions of paper damage caused by overhigh bonding strength in the preparation process and bonded object damage in the application process cannot occur after the emulsion is pasted and applied, so that the synthesis method has the advantages of simple process, mild conditions, stable prepared product and good application effect.
However, in the prior art, when the emulsion acrylate pressure-sensitive adhesive is used on a machine, some problems may occur, such as the problems of sizing in the process of coating and transferring caused by low coating speed, low drying speed and large surface tension, which are specifically represented as the phenomena of 'bubble point', 'mesh print', degumming and the like.
In conclusion, the high-solid low-viscosity pressure-sensitive adhesive for the anilox roller and the preparation method thereof are provided, the preparation process of the high-solid low-viscosity pressure-sensitive adhesive for the anilox roller is simple, the bonding performance of the pressure-sensitive adhesive is excellent, water is used as a medium in the production process, a volatile organic solvent is not used, the production is safe, the environmental pollution is not caused, and the high-solid low-viscosity pressure-sensitive adhesive has the characteristics of high solid low viscosity and meets the use requirement of the adhesive in the coating process of the anilox roller.
Disclosure of Invention
The invention aims to provide a high-solid low-viscosity pressure-sensitive adhesive for an anilox roller and a preparation method thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high-solid low-viscosity pressure-sensitive adhesive for anilox rollers comprises the following raw materials in parts by weight:
70-90 parts of a soft monomer;
10-20 parts of a hard monomer;
4-10 parts of functional monomer;
0.2-0.7 part of an initiator;
1-3 parts of an emulsifier;
0.1-0.2 parts of a buffering agent;
60-80 parts of deionized water.
More preferably, the soft monomer is an acrylic polymer prepared by reacting acrylic acid with an alcohol having 4 to 8 carbon atoms;
the hard monomer is any one or more of methyl methacrylate, methyl acrylate, vinyl acetate, styrene, acrylonitrile or acrylamide. The hard monomer has the functions of providing cohesive force for the polymer and enabling the viscosity of the polymer to be controlled, so that the high-solid low-viscosity polymer is synthesized.
As a further preferable scheme, the functional monomer is an acrylic acid functional monomer, and the acrylic acid functional monomer is any one or more of acrylic acid, maleic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, glycidyl methacrylate, beta-hydroxyethyl acrylate and acrylamide. The functional monomer contains functional groups, can provide viscosity for the polymer, and can increase the cross-linking points of the polymer, thereby improving the adhesive force between the polymer and paper and reducing the defects of easy degumming and the like.
As a further preferable scheme, the soft monomer is a composite monomer of butyl acrylate and isooctyl acrylate, and the ratio of the butyl acrylate to the isooctyl acrylate is 1: 3-3: 1.
As a further preferred embodiment, the hard monomer is methyl methacrylate.
As a further preferable scheme, the functional monomer is one or two of hydroxyethyl acrylate or beta-hydroxyethyl acrylate.
As a further preferred embodiment, the initiator is potassium persulfate or ammonium persulfate.
As a further preferable scheme, the emulsifier is a composite emulsifier, and the composite emulsifier is composed of a nonionic emulsifier A, an anionic emulsifier B and a polymerizable emulsifier C;
wherein the nonionic emulsifier A is succinic acid alkyl sulfonate; the anionic emulsifier B is dihexyl succinate sulfonate; the polymerizable emulsifier C is olefin oxysulfonate, and the proportion of the emulsifier A to the emulsifier B to the emulsifier C is as follows: 1:1:1.
In the further preferable scheme, the anionic emulsifier is a micromolecular polymer emulsifier, so that the polymer has wide particle size distribution, the viscosity of the polymer is greatly reduced, and the flowability is excellent; the polymerizable emulsifier can inlay and connect chemical bonds to emulsion particles in emulsion polymerization to form a part of the particles, thereby effectively improving the stability of the polymer.
As a further preferred embodiment, the buffer is a carbonate or phosphate; more preferably, the buffer is sodium bicarbonate or sodium dihydrogen phosphate.
The preparation method of the high-solid low-viscosity pressure-sensitive adhesive for the anilox roller comprises the following preparation steps:
step A preparation phase
Adding part of emulsifier, all monomers and all buffering agents into a reaction container, and adding part of deionized water for pre-emulsification; wherein, the addition amount of the emulsifier is 80 to 95 percent of the total weight of the emulsifier;
step B of bottoming
Adding part of emulsifier and part of deionized water into a reaction vessel, stirring and dissolving, heating to 60 ℃, and keeping the temperature for 30 min; wherein, the addition amount of the emulsifier is 5 to 20 percent of the total weight of the emulsifier;
step C seed stage
Continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of seed monomers and initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 30-60 min after dropwise adding; wherein the feeding amount of the seed monomer is 10-40% of the total weight of the monomer; the dosage of the initiator is 10-40% of the total weight of the initiator.
Compared with the prior art, the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller has the following beneficial effects:
1) in the preparation formula of the high-solid low-viscosity acrylate pressure-sensitive adhesive, an emulsifier without APEO is used, and auxiliaries such as tackifying resin, a softening agent, an anti-aging agent, a thickening agent and the like are not added, so that the high-solid low-viscosity acrylate pressure-sensitive adhesive is a low-VOC and environment-friendly pressure-sensitive adhesive;
2) in the preparation method, the high-solid low-viscosity acrylate pressure-sensitive adhesive adopts seed semi-continuous emulsion polymerization, so that the monomer conversion rate is high, and the monomer residual rate is effectively reduced; in addition, an organic solvent is not needed in the preparation process, so that the coating has the characteristics of no toxicity, safety in production and small environmental pollution, meets the use requirement of the glue in the anilox roller coating process, and has good economic benefit and practicability;
3) the functional monomer in the pressure-sensitive adhesive contains functional groups, can provide viscosity for polymers, and can increase the cross-linking points of the polymers, thereby improving the adhesive force between the polymers and paper and the like, and reducing the defects of easy degumming and the like;
4) the emulsifier of the pressure-sensitive adhesive of the invention selects three types of emulsifiers: the anionic emulsifier is a micromolecular polymer emulsifier, so that the particle size distribution of the polymer is wide, the viscosity of the polymer is greatly reduced, and the fluidity is excellent; the polymerizable emulsifier can be used for inlaying chemical bonds onto emulsion particles in emulsion polymerization to form a part of the particles, so that the stability of the polymer is effectively improved;
5) in the preparation process of the invention, the addition sequence of the emulsifier is as follows: firstly, the monomer is prepared into pre-emulsion, and the stability in the preparation process can be improved by dripping the pre-emulsion, so that the reaction rate of the monomer is improved or the generation of gel is reduced; the second part is added into a reaction bottle at the bottom of the kettle for bottoming to form seed emulsion, so that the stability is improved; the finally prepared latex particles have different particle sizes, the solid content of the finally prepared latex is improved, and the viscosity of the latex is reduced.
Detailed Description
In order to make the purpose, technical scheme and advantages of the invention clearer, the invention is further described with reference to embodiments 1 to 8 as follows:
the raw materials of the emulsifier used in each example were as follows:
the emulsifiers in the embodiments 1-7 of the application are mixed by three types of emulsifiers according to the weight ratio of 1:1: 1;
the emulsifier in the embodiment 8 is prepared by mixing one or two emulsifiers in three emulsifier types according to the weight part ratio of 3:0 or 1:2, and the operation process steps and others are the same as those in the embodiments 1 to 7.
The nonionic emulsifier A is one or more of ABEXAP2590, ABEXAP470Z, OP-100 and OP-405;
the anionic emulsifier B is one or more of model DNS-458, EF-800, ABEX EP-120 and CO-436;
the polymerizable emulsifier C is one or more of model V-20S, REACTSURF S8115, SE-10 and DNS-86.
Wherein the nonionic emulsifier A is ABEXAP 470Z; the anionic emulsifier B is CO-436; the polymeric emulsifier is DNS-86.
Example 1
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 17.5 parts of butyl acrylate, 52.5 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 10 parts of hydroxyethyl acrylate, 0.2 part of potassium persulfate, 2 parts of emulsifier, 0.1 part of sodium bicarbonate and 60 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A, preparation phase: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein, the addition amount of the emulsifier is 80 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring and dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein the addition amount of the emulsifier is 20 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of seed monomers and initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 30min after dropwise adding is finished. Wherein the dosage of the seed monomer is 10 percent of the total weight of the monomer, and the dosage of the initiator is 10 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1 hour under the stirring condition, then cooling, and discharging.
In the steps A to E, the stirring speed was 180 rpm.
Example 2
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 25 parts of butyl acrylate, 60 parts of isooctyl acrylate, 10 parts of methyl methacrylate, 4 parts of hydroxyethyl acrylate, 0.5 part of potassium persulfate, 2 parts of emulsifier, 0.1 part of sodium bicarbonate and 70 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A preparation stage: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein the addition amount of the emulsifier is 95 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring for dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein, the addition amount of the emulsifier is 5 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of the seed monomer and the initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 60min after dropwise adding. Wherein the feeding amount of the seed monomer is 40 percent of the total weight of the monomer, and the feeding amount of the initiator is 40 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1.5 hours under the stirring condition, then cooling, and discharging.
In steps A to E, the stirring speed was 300 rpm.
Example 3
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 21.2 parts of butyl acrylate, 63.8 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 7 parts of hydroxyethyl acrylate, 3 parts of beta-acryloxypropionic acid, 0.5 part of potassium persulfate, 3 parts of emulsifier, 0.1 part of sodium bicarbonate and 80 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A preparation stage: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein the addition amount of the emulsifier is 90 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring and dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein, the addition amount of the emulsifier is 10 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of the seed monomer and the initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 45min after dropwise adding. Wherein the dosage of the seed monomer is 20 percent of the total weight of the monomer, and the dosage of the initiator is 30 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1 hour under the stirring condition, then cooling, and discharging.
In steps A to E, the stirring speed was 240 rpm.
Example 4
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 40 parts of butyl acrylate, 40 parts of isooctyl acrylate, 10 parts of methyl methacrylate, 7 parts of hydroxyethyl acrylate, 3 parts of beta-acryloxypropionic acid, 0.7 part of potassium persulfate, 3 parts of an emulsifier, 0.2 part of sodium bicarbonate and 70 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A preparation stage: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein the addition amount of the emulsifier is 85 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring and dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein the addition amount of the emulsifier is 15 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of seed monomers and initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 30min after dropwise adding is finished. Wherein the feeding amount of the seed monomer is 30 percent of the total weight of the monomer, and the feeding amount of the initiator is 20 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1 hour under the stirring condition, then cooling, and discharging.
Preferably, in the steps A to E, the stirring speed is 260 rpm.
Example 5
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 52.5 parts of butyl acrylate, 17.5 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 10 parts of hydroxyethyl acrylate, 0.2 part of potassium persulfate, 1 part of emulsifier, 0.1 part of sodium bicarbonate and 60 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A, preparation phase: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein the addition amount of the emulsifier is 85 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring and dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein the addition amount of the emulsifier is 15 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of seed monomers and initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 30min after dropwise adding is finished. Wherein the feeding amount of the seed monomer is 30 percent of the total weight of the monomer, and the feeding amount of the initiator is 20 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1 hour under the stirring condition, then cooling, and discharging.
In the steps A to E, the stirring speed was 260 rpm.
Example 6
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 60 parts of butyl acrylate, 25 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 4 parts of beta-acryloxypropionic acid, 0.4 part of potassium persulfate, 2 parts of emulsifier, 0.1 part of sodium bicarbonate and 70 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A preparation stage: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein the addition amount of the emulsifier is 90 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring and dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein, the addition amount of the emulsifier is 10 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of the seed monomer and the initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 60min after dropwise adding. Wherein the feeding amount of the seed monomer is 15 percent of the total weight of the monomer, and the feeding amount of the initiator is 15 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed liquor obtained in the step B to 85 ℃, preserving the heat for 1.5 hours under the stirring condition, then cooling, and discharging.
In steps A to E, the stirring speed was 300 rpm.
Example 7
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 63.8 parts of butyl acrylate, 21.2 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 10 parts of hydroxyethyl acrylate, 0.5 part of potassium persulfate, 3 parts of emulsifier, 0.1 part of sodium bicarbonate and 80 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A, preparation phase: adding part of the emulsifier, all the monomers and all the buffer into a reaction vessel, and adding part of deionized water to perform pre-emulsification. Wherein the addition amount of the emulsifier is 90 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring for dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein, the addition amount of the emulsifier is 10 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of the seed monomer and the initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 45min after dropwise adding. Wherein the feeding amount of the seed monomer is 15 percent of the total weight of the monomer, and the feeding amount of the initiator is 30 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1 hour under the stirring condition, then cooling, and discharging.
In the steps A to E, the stirring speed was 220 rpm.
Example 8
A high-solid low-viscosity pressure-sensitive adhesive for an anilox roller comprises the following raw materials in parts by weight: 31.4 parts of butyl acrylate, 53.6 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 7 parts of hydroxyethyl acrylate, 3 parts of beta-acryloxypropionic acid, 0.5 part of potassium persulfate, 3 parts of emulsifier, 0.1 part of sodium bicarbonate and 80 parts of deionized water;
the preparation method of the pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller comprises the following steps:
step A, preparation phase: adding part of the emulsifier, all the monomers and all the buffering agent into a reaction vessel, and adding part of deionized water for pre-emulsification. Wherein the addition amount of the emulsifier is 90 percent of the total weight of the emulsifier;
step B, a bottoming stage: adding part of emulsifier and part of deionized water into a reaction vessel, stirring for dissolving, heating to 60 ℃, and keeping the temperature for 30 min. Wherein the addition amount of the emulsifier is 10 percent of the total weight of the emulsifier;
step C, a seed stage: and C, continuously heating the mixed solution obtained in the step B to 80 ℃, dropwise adding part of the seed monomer and the initiator aqueous solution into the reaction container in the step B at a constant speed under the stirring condition, and preserving heat for 45min after dropwise adding. Wherein the feeding amount of the seed monomer is 10 percent of the total weight of the monomer, and the feeding amount of the initiator is 10 percent of the total weight of the initiator;
step D, a feeding stage: after the heat preservation is finished, under the stirring condition, dropwise adding the residual initiator aqueous solution and the residual monomers into the reaction container in the step B at a constant speed, and keeping the temperature unchanged in the dropwise adding process;
step E, heat preservation reaction: and C, continuously heating the mixed solution obtained in the step B to 85 ℃, keeping the temperature for 1 hour under the stirring condition, then cooling, and discharging.
In the steps A to E, the stirring speed was 260 rpm.
And (3) performance testing:
the pressure-sensitive adhesive of examples 1 to 8 of the present invention was coated with a coat weight of 19 ± 1g, a matte white BOPP film as a face material, and a white glassine release paper as a base paper. Permanent adhesion testing according to permanent adhesion test on Standard Panel FTM 8; peel force test according to "90 ° peel force test" FTM 2; the ring initial adhesion test was according to FTM 9. The test results are shown in the following table:
TABLE 1 test results for products prepared by coating the pressure-sensitive adhesives of examples 1-7
As can be seen from the data in the table, the pressure-sensitive adhesive prepared in example 5 has the best overall effect, and has no phenomena of screen printing and rubber surface blooming in the coating process; the invention has stable synthesis and high solid content and low viscosity of the polymer, and can meet the coating requirement of an anilox roller. The proper viscosity is helpful for reducing the appearance of 'anilox' in the coating process, and the proper solid content of the polymer of the anilox roller can reduce the dilution of water before coating, reduce the probability of 'rubber surface blooming', shorten the drying time after coating, improve the drying speed and reduce the energy consumption.
The pressure-sensitive adhesive non-setting adhesive provided by the invention has the advantages that the annular initial adhesion is more than 9N/25mm, the 90-degree stripping force is more than 5N/25mm, the permanent adhesion is more than 100h, the comprehensive performance is good, and the use requirement of the non-setting adhesive can be well met.
The above description is only for the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention are within the scope of the present invention.
Claims (10)
1. The pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller is characterized by comprising the following raw materials in parts by weight:
70-90 parts of a soft monomer;
10-20 parts of a hard monomer;
4-10 parts of functional monomer;
0.2-0.7 part of an initiator;
1-3 parts of an emulsifier;
0.1-0.2 parts of a buffering agent;
60-80 parts of deionized water.
2. The pressure-sensitive adhesive for anilox rollers of claim 1, wherein,
the soft monomer is an acrylic ester polymer prepared by reacting acrylic acid with alcohol with 4-8 carbon atoms;
the hard monomer is any one or more of methyl methacrylate, methyl acrylate, vinyl acetate, styrene, acrylonitrile or acrylamide.
3. The high-solid low-viscosity pressure-sensitive adhesive for the anilox roller as claimed in claim 1, wherein the functional monomer is an acrylic functional monomer, and the acrylic functional monomer is any one or more of acrylic acid, maleic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, glycidyl methacrylate, beta-hydroxyethyl acrylate and acrylamide.
4. The pressure-sensitive adhesive with high solid content and low viscosity for the anilox roller as claimed in claim 1, wherein the soft monomer is a composite monomer of butyl acrylate and isooctyl acrylate, and the ratio of the butyl acrylate to the isooctyl acrylate is 1: 3-3: 1.
5. The high-solid low-tack pressure-sensitive adhesive for anilox rolls according to claim 1, wherein the hard monomer is methyl methacrylate.
6. The high-solid low-viscosity pressure-sensitive adhesive for the anilox roller as claimed in claim 1, wherein the functional monomer is one or both of hydroxyethyl acrylate and beta-hydroxyethyl acrylate.
7. The high-solid low-viscosity pressure-sensitive adhesive for the anilox roll according to claim 1, wherein the initiator is any one or more of potassium persulfate and ammonium persulfate.
8. The high-solid low-viscosity pressure-sensitive adhesive for the anilox roller according to claim 1, wherein the emulsifier is a compound emulsifier, and the compound emulsifier consists of an emulsifier A, an emulsifier B and an emulsifier C; the emulsifier A is a nonionic emulsifier A; emulsifier B anionic emulsifier B; the emulsifier C is a polymerizable emulsifier C;
the non-ionic emulsifier A is succinic acid alkyl sulfonate; the anionic emulsifier B is dihexyl succinate sulfonate; the polymerizable emulsifier C is olefin oxysulfonate, and the proportion of the emulsifier A to the emulsifier B to the emulsifier C is as follows: 1:1:1.
9. The high-solid low-tack pressure sensitive adhesive for anilox rolls of claim 1, wherein the buffer is a carbonate or phosphate; more preferably, the buffer is sodium bicarbonate or sodium dihydrogen phosphate.
10. The pressure-sensitive adhesive for anilox rollers of claim 8, wherein,
the nonionic emulsifier A is any one or more of ABEXAP2590, ABEXAP470Z, OP-100 and OP-405;
the anionic emulsifier B is any one or more of the models of DNS-458, EF-800, ABEX EP-120 and CO-436;
the polymerizable emulsifier C is any one or more of model V-20S, REACTSURF S8115, SE-10 and DNS-86.
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