Water-based advertising sticker pressure-sensitive adhesive with excellent wetting performance and preparation method thereof

Abstract

The present invention belongs to the technical field of C09J133 / 08 adhesives, and more specifically relates to a water-based advertising sticker pressure-sensitive adhesive with excellent wetting properties and a preparation method thereof. A water-based advertising sticker pressure-sensitive adhesive with excellent wetting properties, the preparation raw materials include polymer emulsion and auxiliary agent; the polymer emulsion includes at least one of styrene-acrylate copolymer emulsion, pure acrylic emulsion, and acetic acid acrylic emulsion. The water-based advertising sticker pressure-sensitive adhesive prepared by the present invention has excellent wetting properties and suitable viscosity, and can realize the coating method of transfer coating when used for cold mounting film backing glue, and can basically achieve no shrinkage cavities and shrinkage edges within 5s, meet the needs of production transfer coating, and avoid the oil shrinkage phenomenon that may occur during use.

Description

Technical Field

[0001] The invention belongs to the technical field of C09J133 / 08 adhesives, and more specifically relates to a water-based advertising pressure-sensitive adhesive with excellent wetting properties and a preparation method thereof. Background Art

[0002] With the strengthening of environmental protection in the country, the increase of people's environmental awareness, and the guidance of market price trends, water-based acrylic pressure-sensitive adhesive as a backing adhesive advertising sticker has become an important development at this stage.

[0003] Traditional adhesive backing is mainly oily acrylic pressure-sensitive adhesive, but a large amount of solvent volatilization will be produced during the drying process, which is not only a waste of raw materials, but also causes certain pollution to the environment and harms people, animals and plants. Therefore, in recent years, people have tried to use water-based pressure-sensitive adhesive to replace oily pressure-sensitive adhesive; however, water-based acrylic pressure-sensitive adhesive is prone to some problems during use: mainly manifested in two aspects: First, the comprehensive performance of water-based acrylic pressure-sensitive adhesive is not as good as that of oily pressure-sensitive adhesive; Second, during the transfer coating process of water-based pressure-sensitive adhesive, oil shrinkage is easy to occur on the surface of silicone oil paper, affecting the distribution state of the product film, and it is necessary to add a large amount of wetting agent to improve its wetting performance.

[0004] A Chinese invention patent with publication number CN112661900A discloses a styrene acrylic emulsion pressure sensitive adhesive for a protective film, a preparation method thereof, a styrene acrylic emulsion pressure sensitive adhesive tape for a protective film, and an application thereof. In the patent disclosure, a protective film for use as a protective film on the surface of products such as fluorocarbon aluminum profiles, electrophoretic paint aluminum profiles, stainless steel, glass, home appliances, and anodized aluminum profiles is prepared by using styrene and acrylate monomers. However, the prepared pressure sensitive adhesive is prone to oil shrinkage during use, which affects the distribution state of the product film.

[0005] In order to solve the coating and wetting properties of pressure-sensitive adhesives at this stage, it is still a challenge for researchers. Summary of the invention

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a water-based advertising sticker pressure-sensitive adhesive with excellent wetting properties, and the preparation raw materials include polymer emulsion and additives;

[0007] The polymer emulsion comprises at least one of styrene-acrylate copolymer emulsion, pure acrylic emulsion and acetate-acrylic emulsion.

[0008] In some preferred embodiments, the polymer emulsion is a styrene-acrylate copolymer emulsion.

[0009] It should be noted that the term "styrenes" in and described in this application refers to a monomer containing a molecular structure, or a polymer containing a polymerization unit, and the molecular structure or polymerization unit is styrene or its derivatives, for example, methylstyrene, vinyltoluene, methoxystyrene, butylstyrene, chlorostyrene or their analogs.

[0010] In some preferred embodiments, the styrenes include styrene.

[0011] The "acrylates" mentioned in this application refer to a monomer containing a molecular structure, or a polymer including a polymerization unit, wherein the molecular structure or polymerization unit is: (meth)acrylic acid, (meth)acrylic acid alkyl ester, (meth)acrylamide, (meth)acrylic acid nitrile or its modified structure, for example, (meth)acrylic acid hydroxyalkyl ester.

[0012] In addition, suitable acrylic acid ester monomers include: (meth) acrylic acid C1-C30 alkyl ester monomers, (meth) acrylic acid C5-C30 cycloalkyl ester monomers, (meth) acrylic acid C5-C30 (alkyl) aryl ester monomers; for example, methyl methacrylate, isobutyl methacrylate and low Tg acrylic acid monomers. In some preferred embodiments, the low Tg acrylic acid monomers include but are not limited to ethyl acrylate (EA), butyl acrylate (BA), tert-butyl acrylate (t-BA), 2-ethylhexyl acrylate (2-EHA), lauryl acrylate, lauryl methacrylate, hexadecyl (meth)acrylate, eicosyl (meth)acrylate, hexadecyl eicosyl (meth)acrylate, behenyl (meth)acrylate, methyl acrylate, butyl methacrylate (BMA) and mixtures thereof.

[0013] In some preferred embodiments, the acrylic esters include ethyl acrylate, methacrylic acid, butyl acrylate, 2-ethylhexyl acrylate, acrylic acid, and methyl methacrylate.

[0014] In some preferred embodiments, the weight of the auxiliary agent is 0.01-2% of the total weight of the raw materials; preferably, it is 0.1-1% of the total weight of the raw materials.

[0015] In some preferred embodiments, the auxiliary agent includes at least one of a thickener, a wetting agent, a defoaming agent, an emulsifier, an initiator, and a pH adjuster.

[0016] In some preferred embodiments, the weight of the thickener is 0.01-2% of the total weight of the raw materials; preferably, it is 0.1-0.8% of the total weight of the raw materials.

[0017] In some preferred embodiments, the thickener is a thixotropic thickener.

[0018] In some preferred embodiments, the thixotropic thickener is selected from at least one of an alkali-swellable thickener, an associative thickener, and a cellulose thickener.

[0019] In some preferred embodiments, the alkali swelling thickener is BLJ-935.

[0020] BLJ-935 thickener was purchased from Shanghai Baolijia Chemical Co., Ltd.

[0021] In some preferred embodiments, the associative thickener is RM-8W.

[0022] RM-8W thickener, purchased from BASF, USA;

[0023] In some preferred embodiments, the cellulose thickener is carboxymethyl cellulose.

[0024] During the experiment, the applicant found that adding a thixotropic thickener to the system can greatly improve the balance between the viscosity and wetting properties of the prepared pressure-sensitive adhesive, especially when the weight of the thickener is in the range of 0.1-1% of the weight of the raw material, and can ensure that it avoids shrinkage when used on the surface of the cold laminating film. The applicant speculates that the reason for this phenomenon is that the thixotropic thickener added to the system contains hydrophobic and hydrophilic groups. After being added to the pressure-sensitive adhesive system, it can slow down the increase in the thickness of the system's hydration layer, while ensuring a good leveling effect, it increases the possibility of coating on the surface of the cold laminating film, avoiding possible internal defects and shrinkage problems.

[0025] In some preferred embodiments, the emulsifier is selected from at least one of fatty alcohol polyoxyethylene ether sulfate sodium salt, sulfosuccinate, branched dodecylbenzene sulfonate sodium salt, EO / PO polyether block copolymer, fatty alcohol ethoxylate, and aromatic alcohol ethoxylate.

[0026] In some preferred embodiments, the pH adjuster is an alkaline substance.

[0027] Further preferably, the alkaline substance is an inorganic base and / or an organic base.

[0028] In the present application, the organic base includes but is not limited to one or a mixture of ethanolamine, diethanolamine, triethanolamine, and triethylamine.

[0029] In some preferred embodiments, the defoaming agent is selected from silicone defoaming agents, polyether defoaming agents, polyether-modified polysiloxane defoaming agents and combinations thereof.

[0030] More preferably, the defoaming agent is a polyether defoaming agent.

[0031] In some preferred embodiments, the initiator is a free radical initiator.

[0032] More preferably, the initiator is one or a combination of ammonium persulfate, sodium persulfate, and potassium persulfate.

[0033] In some preferred embodiments, residual monomers are eliminated when the temperature drops to 75° C. after the synthesis and insulation, that is, an oxidant and a reductant are added dropwise into the reaction kettle at the same time.

[0034] More preferably, the oxidizing agent used is hydrogen peroxide and the reducing agent is bleaching agent.

[0035] In some preferred embodiments, the raw materials for preparing the water-based advertising pressure-sensitive adhesive with excellent wetting properties include, by weight, 1-5 parts of styrene, 30-70 parts of acrylates, 0.1-1 parts of emulsifiers, 0.1-1 parts of free radical initiators, 1-3 parts of polymer initiators, 1-3 parts of reducing agents, 0.1-1 parts of wetting agents, 0.1-1 parts of defoaming agents, 0.5-2 parts of pH regulators, 0.1-1 parts of thickeners, and 30-100 parts of water.

[0036] The second aspect of the present invention provides a method for preparing a water-based advertising pressure-sensitive adhesive having excellent wetting properties, comprising the following steps:

[0037] 1) Preparation of polymer emulsion;

[0038] 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity, filtering, and discharging to obtain the product.

[0039] In some preferred embodiments, the polymer emulsion preparation in step 1) includes the preparation of a pre-emulsion solution and the preparation of an initiator solution.

[0040] In some preferred embodiments, the viscosity of the solution is adjusted to 50-5000 cps in step 2), preferably, the viscosity is adjusted to 200-3000 cps.

[0041] In some preferred embodiments, the filtration in step 2) is performed through a 50-200 mesh filter cloth.

[0042] Beneficial effects: The water-based advertising pressure-sensitive adhesive with excellent wetting properties prepared by the present invention has the following advantages:

[0043] 1. The water-based advertising sticker pressure-sensitive adhesive prepared by the present invention has excellent wetting performance and suitable viscosity. When used for cold lamination film back glue, it can realize the coating method of transfer coating, and basically can achieve no shrinkage cavities and shrinkage edges within 5 seconds, meeting the needs of production transfer coating and avoiding the oil shrinkage phenomenon that may occur during use;

[0044] 2. The water-based advertising sticker pressure-sensitive adhesive prepared by the present invention is also suitable for transfer coating of release paper;

[0045] 3. The water-based advertising sticker pressure-sensitive adhesive prepared by the present invention is safe, environmentally friendly and non-toxic, and has no harm to either the coating process or the use process, and has extremely high application value. DETAILED DESCRIPTION

[0046] Example

[0047] Example 1

[0048] A water-based advertising pressure-sensitive adhesive with excellent wetting properties. The raw materials for its preparation include, by weight, 2 parts of styrene, 54.4 parts of acrylates, 0.6 parts of emulsifiers, 0.3 parts of free radical initiators, 1.2 parts of polymer initiators, 1.1 parts of reducing agents, 0.4 parts of wetting agents, 0.1 parts of defoaming agents, 1 part of pH regulators, 0.4 parts of thickeners, and 42 parts of water.

[0049] The acrylic esters are butyl acrylate, hydroxyethyl acrylate and acrylic acid, and their weight parts are 52.75 parts, 0.8 parts and 0.85 parts respectively.

[0050] The emulsifier is sodium dodecylbenzene sulfonate;

[0051] The free radical initiator is ammonium persulfate;

[0052] The polymerization initiator is a 1% mass concentration of tert-butyl hydroperoxide aqueous solution;

[0053] The reducing agent is a 0.55% mass concentration of bleaching powder aqueous solution;

[0054] The wetting agent is alkyl polyoxyethylene ether and WET-100 wetting agent, and the weight ratio thereof is 1:1;

[0055] The alkyl polyoxyethylene ether, model OT-75, was purchased from Shanghai Hongtu Industrial Co., Ltd.;

[0056] The WET-100 wetting agent was purchased from Shanghai Xuchu Chemical Co., Ltd.

[0057] The defoamer is A10 defoamer purchased from Corning Company;

[0058] The pH regulator is ammonia water;

[0059] The thickener is an alkali swelling thickener, model BLJ-935, purchased from Shanghai Baolijia Chemical Co., Ltd.;

[0060] A method for preparing a water-based advertising pressure-sensitive adhesive with excellent wetting properties comprises the following steps:

[0061] 1) Preparation of polymer emulsion:

[0062] S1: Weigh 18 parts of deionized water and 0.5 parts of sodium dodecylbenzenesulfonate into an emulsifying tank, stir for 5 minutes, add styrene, butyl acrylate, hydroxyethyl acrylate, and acrylic acid while stirring, and stir rapidly for 30 minutes to prepare a pre-emulsion;

[0063] S2: Weigh ammonium persulfate and dissolve it in 4 g of deionized water to prepare an initiator solution;

[0064] 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity, filtering, and discharging to obtain the product.

[0065] The specific operations described in step 2) are:

[0066] S3: Weigh the remaining deionized water and add 0.1g sodium dodecylbenzenesulfonate into the reactor, stir and heat to 84°C, add 2% pre-emulsion and 60% initiator solution, react for 10 minutes, start to drop the remaining pre-emulsion and initiator solution, the drop time is 3.5 hours, the reaction temperature is 85°C, and keep warm for 1 hour after addition;

[0067] S4: cool the step S3 to 75°C, and simultaneously add tert-butyl hydroperoxide aqueous solution and bleaching powder aqueous solution dropwise. After a reaction time of 30 min, cool the mixture to 50°C, add a wetting agent and a defoaming agent, stir evenly, add a pH regulator to adjust the pH to 8, and finally add a thickener to adjust the viscosity to 1000 mPa·s. After stabilization, filter the mixture with a 100-mesh filter cloth to obtain the product.

[0068] Example 2

[0069] A water-based advertising pressure-sensitive adhesive with excellent wetting properties. The raw materials for its preparation include, by weight, 3.5 parts of styrene, 53.35 parts of acrylates, 0.59 parts of emulsifiers, 0.29 parts of free radical initiators, 1.2 parts of polymer initiators, 1.1 parts of reducing agents, 0.4 parts of wetting agents, 0.1 parts of defoaming agents, 1 part of pH regulators, 0.4 parts of thickeners, and 39.5 parts of water.

[0070] The acrylic esters are butyl acrylate, hydroxyethyl acrylate, acrylic acid and acrylamide, and their weight parts are 51.85 parts, 0.6 parts, 0.8 parts and 0.1 parts respectively.

[0071] The emulsifier is sodium dodecylbenzene sulfonate;

[0072] The free radical initiator is ammonium persulfate;

[0073] The polymerization initiator is a 1% mass concentration of tert-butyl hydroperoxide aqueous solution;

[0074] The reducing agent is a VC aqueous solution with a mass concentration of 0.55%;

[0075] The wetting agent is alkyl polyoxyethylene ether 1;

[0076] The alkyl polyoxyethylene ether, model OT-75, was purchased from Shanghai Hongtu Industrial Co., Ltd.;

[0077] The defoamer is A10 defoamer purchased from Corning Company;

[0078] The pH regulator is aqueous ammonia;

[0079] The thickener is an alkali swelling thickener, model BLJ-935, purchased from Shanghai Baolijia Chemical Co., Ltd.;

[0080] A method for preparing a water-based advertising pressure-sensitive adhesive with excellent wetting properties comprises the following steps:

[0081] 1) Preparation of polymer emulsion:

[0082] S1: Weigh 16.5 parts of deionized water and 0.5 parts of sodium dodecylbenzenesulfonate into an emulsifying tank, stir for 5 minutes, add styrene, butyl acrylate, hydroxyethyl acrylate, acrylic acid, and acrylamide while stirring, and stir rapidly for 30 minutes to prepare a pre-emulsion;

[0083] S2: Weigh ammonium persulfate and dissolve it in 4 g of deionized water to prepare an initiator solution;

[0084] 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity, filtering, and discharging to obtain the product.

[0085] The specific operations described in step 2) are:

[0086] S3: Weigh the remaining deionized water and add 0.09g sodium dodecylbenzenesulfonate into the reactor, stir and heat to 84°C, add 3% pre-emulsion and 60% initiator solution, react for 10 minutes, start to drop the remaining pre-emulsion and initiator solution, the drop time is 4 hours, the reaction temperature is 85°C, and keep the temperature for 1 hour after adding;

[0087] S4: cool down the temperature of step S3 to 75°C, add tert-butyl hydroperoxide aqueous solution and VC aqueous solution dropwise at the same time, react for 30 minutes, cool down to 50°C, add wetting agent and defoaming agent, stir evenly, add pH regulator to adjust the pH to 8, finally add thickener to adjust the viscosity to 1200mPa·s, filter the material with 100 mesh filter cloth after stabilization, and obtain the product.

[0088] Example 3

[0089] A water-based advertising pressure-sensitive adhesive with excellent wetting properties. The raw materials for its preparation include, by weight, 54.8 parts of acrylates, 0.5 parts of emulsifiers, 0.3 parts of free radical initiators, 1.2 parts of polymer initiators, 1.1 parts of reducing agents, 0.4 parts of wetting agents, 0.1 parts of defoaming agents, 0.8 parts of pH regulators, 0.5 parts of thickeners, and 42 parts of water.

[0090] The acrylic esters are methyl methacrylate, butyl acrylate, hydroxyethyl acrylate and acrylic acid, and their weight parts are 3 parts, 50.5 parts, 0.8 parts and 0.5 parts respectively.

[0091] The emulsifier is fatty alcohol polyoxyethylene ether sodium sulfate;

[0092] The free radical initiator is sodium persulfate;

[0093] The polymerization initiator is a 1% mass concentration of tert-butyl hydroperoxide aqueous solution;

[0094] The reducing agent is a 0.55% mass concentration of bleaching powder aqueous solution;

[0095] The wetting agent is alkyl polyoxyethylene ether and WET-100 wetting agent, and the weight ratio thereof is 3:1;

[0096] The alkyl polyoxyethylene ether, model OT-75, was purchased from Shanghai Hongtu Industrial Co., Ltd.;

[0097] The WET-100 wetting agent was purchased from Shanghai Xuchu Chemical Co., Ltd.

[0098] The defoamer is A10 defoamer purchased from Corning Company;

[0099] The pH regulator is ammonia water;

[0100] The thickener is carboxymethyl cellulose;

[0101] The preparation method of a water-based advertising pressure-sensitive adhesive with excellent wetting properties is described in Example 1.

[0102] Example 4

[0103] A water-based advertising pressure-sensitive adhesive with excellent wetting properties. The raw materials for its preparation include, by weight, 55.5 parts of acrylates, 0.65 parts of emulsifiers, 0.28 parts of free radical initiators, 0.5 parts of wetting agents, 0.1 parts of defoaming agents, 1.1 parts of pH regulators, 0.5 parts of thickeners, and 41 parts of water.

[0104] The acrylic esters are methyl methacrylate, butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate and acrylic acid, and their weight parts are 3 parts, 48.5 parts, 2.5 parts, 0.7 parts and 0.8 parts respectively.

[0105] The emulsifiers are sodium dodecylbenzenesulfonate and fatty alcohol ethoxylate;

[0106] The fatty alcohol ethoxylate is AEO-9, purchased from China Petroleum Jilin Chemical Group

[0107] The free radical initiator is sodium persulfate;

[0108] The wetting agents are OT-70 wetting agent and WET-100 wetting agent, and the weight ratio thereof is 2:3;

[0109] The OT-70 wetting agent was purchased from; the WET-100 wetting agent was purchased from Shanghai Xuchu Chemical Co., Ltd.

[0110] The defoamer is A10 defoamer purchased from Corning Company;

[0111] The pH regulator is ammonia water;

[0112] The thickener is an alkali swelling thickener, model BLJ-935, purchased from Shanghai Baolijia Chemical Co., Ltd.;

[0113] A method for preparing a water-based advertising pressure-sensitive adhesive with excellent wetting properties comprises the following steps:

[0114] 1) Preparation of polymer emulsion:

[0115] S1: Weigh 16 parts of deionized water, 0.4 parts of sodium dodecylbenzenesulfonate, and 0.1 parts of fatty alcohol ethoxylate, add them into an emulsifying tank, stir for 5 minutes, add methyl methacrylate, butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate, and acrylic acid while stirring, and stir rapidly for 30 minutes to prepare a pre-emulsion;

[0116] S2: Weigh ammonium persulfate and dissolve it in 4 g of deionized water to prepare an initiator solution;

[0117] 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity, filtering, and discharging to obtain the product.

[0118] The specific operations described in step 2) are:

[0119] S3: Weigh the remaining deionized water and add 0.15g sodium dodecylbenzenesulfonate into the reactor, stir and heat to 84°C, add 2.5% pre-emulsion and 65% initiator solution, react for 10 minutes, start to drop the remaining pre-emulsion and initiator solution, the drop time is 4 hours, the reaction temperature is 85°C, and keep the temperature for 1.5 hours after addition;

[0120] S4: cool down the temperature of step S3 to 60°C, add a wetting agent and a defoaming agent, stir evenly, cool down to 50°C, add a pH adjuster to adjust the pH to 8, and finally add a thickener to adjust the viscosity to 1400 mPa·s. After stabilization, filter the material with a 100-mesh filter cloth to obtain the product.

[0121] Example 5

[0122] A water-based advertising pressure-sensitive adhesive with excellent wetting properties. The raw materials for its preparation include, by weight, 3.5 parts of vinyl acetate, 51.45 parts of acrylates, 0.9 parts of emulsifiers, 0.32 parts of free radical initiators, 0.3 parts of wetting agents, 0.1 parts of defoaming agents, 1 part of pH regulators, 0.2 parts of thickeners, and 42 parts of water.

[0123] The acrylic esters are butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate and methacrylic acid, and their weight parts are 47.5 parts, 2.5 parts, 0.7 parts and 0.75 parts respectively.

[0124] The emulsifier is sodium dodecyl diphenyl ether sulfonate;

[0125] The free radical initiator is ammonium persulfate;

[0126] The wetting agent is BYK-310, purchased from BYK;

[0127] The defoamer is A10 defoamer purchased from Corning Company;

[0128] The pH regulator is ammonia water;

[0129] The thickener is an associative thickener, RM-8W thickener, purchased from BASF, USA;

[0130] A method for preparing a water-based advertising pressure-sensitive adhesive with excellent wetting properties comprises the following steps:

[0131] 1) Preparation of polymer emulsion:

[0132] S1: Weigh 17 parts of deionized water and 0.7 parts of sodium dodecyl diphenyl ether sulfonate into an emulsifying tank, stir for 5 minutes, add vinyl acetate, butyl acrylate, isooctyl acrylate, hydroxyethyl acrylate, and methacrylic acid while stirring, and stir rapidly for 30 minutes to prepare a pre-emulsion;

[0133] S2: Weigh ammonium persulfate and dissolve it in 4 g of deionized water to prepare an initiator solution;

[0134] 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity, filtering, and discharging to obtain the product.

[0135] The specific operations described in step 2) are:

[0136] S3: Weigh the remaining deionized water and add 0.15g sodium dodecylbenzenesulfonate into the reactor, stir and heat to 84°C, add 2.5% pre-emulsion and 65% initiator solution, react for 10 minutes, start to drop the remaining pre-emulsion and initiator solution, the drop time is 3.5 hours, the reaction temperature is 85°C, and keep warm for 1.5 hours after addition;

[0137] S4: cool down the temperature of step S3 to 60°C, add a wetting agent and a defoaming agent, stir evenly, cool down to 50°C, add a pH adjuster to adjust the pH to 8, and finally add a thickener to adjust the viscosity to 900 mPa·s. After stabilization, filter the material with a 100-mesh filter cloth to obtain the product.

[0138] Example 6

[0139] A water-based advertising pressure-sensitive adhesive with excellent wetting properties. The raw materials for its preparation include, by weight: 3 parts of vinyl methyl acetate, 51.45 parts of acrylates, 0.75 parts of emulsifiers, 0.35 parts of free radical initiators, 0.4 parts of wetting agents, 0.1 parts of defoaming agents, 1.1 parts of pH regulators, 0.5 parts of thickeners, and 44 parts of water.

[0140] The acrylic esters are butyl acrylate, ethyl acrylate, hydroxyethyl acrylate and methacrylic acid, and their weight parts are 48.5 parts, 2.5 parts, 0.6 parts and 0.6 parts respectively.

[0141] The emulsifier is sodium dodecyl diphenyl ether sulfonate;

[0142] The free radical initiator is sodium persulfate;

[0143] The wetting agents are OT-70 wetting agent and BYK-310, and the weight ratio thereof is 1:3;

[0144] OT-70 wetting agent, purchased from;

[0145] The defoamer is A10 defoamer purchased from Corning Company;

[0146] The pH regulator is ammonia water;

[0147] The thickener is an alkali swelling thickener, model BLJ-935, purchased from Shanghai Baolijia Chemical Co., Ltd.;

[0148] A method for preparing a water-based advertising pressure-sensitive adhesive with excellent wetting properties comprises the following steps:

[0149] 1) Preparation of polymer emulsion:

[0150] S1: Weigh 20 parts of deionized water and 0.6 parts of sodium dodecyl diphenyl ether sulfonate into an emulsifying tank, stir for 5 minutes, add vinyl acetate, butyl acrylate, ethyl acrylate, hydroxyethyl acrylate, and methacrylic acid while stirring, and stir rapidly for 40 minutes to prepare a pre-emulsion;

[0151] S2: Weigh ammonium persulfate and dissolve it in 5 g of deionized water to prepare an initiator solution;

[0152] 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity, filtering, and discharging to obtain the product.

[0153] The specific operations described in step 2) are:

[0154] S3: Weigh the remaining deionized water and add 0.15g sodium dodecylbenzenesulfonate into the reactor, stir and heat to 84°C, add 3% pre-emulsion and 72% initiator solution, react for 10 minutes, start to drop the remaining pre-emulsion and initiator solution, the drop time is 3.5 hours, the reaction temperature is 85°C, and keep the temperature for 1.5 hours after adding;

[0155] S4: cool down the temperature of step S3 to 60°C, add a wetting agent and a defoaming agent, stir evenly, cool down to 50°C, add a pH adjuster to adjust the pH to 8, and finally add a thickener to adjust the viscosity to 1300 mPa·s. After stabilization, filter the material with a 100-mesh filter cloth to obtain the product.

[0156] Performance Test:

[0157] A. Emulsion wetting ability test: Use a 25-wire rod and a small coating machine to evenly apply the glue on the silicone oil surface of the transfer film, observe the changes in 1, 3, 5, 7, and 10 seconds, and record the above performance test results in the following Table 1;

[0158] B. Test of emulsion pressure sensitivity:

[0159] 20min peeling force test: Tested using a computer testing machine in accordance with GB / T2792~1998.

[0160] Initial adhesion test: Test according to GB / T4852-2002, with the ball number indicating the initial adhesion.

[0161] Adhesion test: Tested in accordance with GB / T4851-1998 and expressed by drop time.

[0162] The above performance test results are recorded in Table 2 below;

[0163] Table 1:

[0164]

[0165] The above performance test results show that when the wetting agent and thickener are matched, the prepared pressure-sensitive adhesive has good wetting properties and can basically achieve no shrinkage crater or edge shrinkage within 5 seconds, meeting the needs of production transfer coating. Similarly, the glue produced by this process is also suitable for transfer coating of release paper.

[0166] Table 2:

[0167]

[0168] The above performance test results show that the pressure-sensitive adhesive prepared by this application has good performance and can fully meet the application requirements of cold lamination film. Moreover, under the mediation of this wetting system, whether styrene acrylic, pure acrylic, or acetate acrylic emulsion has good applicability and can meet the requirements of transfer coating.

Claims

1. A water-based advertising pressure-sensitive adhesive with excellent wetting properties, characterized in that: The raw materials for preparation are 1-5 parts of styrene, 30-70 parts of acrylates, 0.1-1 parts of emulsifiers, 0.1-1 parts of free radical initiators, 1-3 parts of polymer initiators, 1-3 parts of reducing agents, 0.1-1 parts of wetting agents, 0.1-1 parts of defoaming agents, 0.5-2 parts of pH regulators, 0.1-1 parts of thixotropic thickeners, and 30-100 parts of water; The method for preparing the pressure-sensitive adhesive comprises the following steps: 1) Preparation of polymer emulsion; 2) Adding an auxiliary agent to the prepared polymer emulsion, stirring, adjusting the viscosity to 900-1400 cps, filtering through a 50-200 mesh filter cloth, and discharging the material to obtain; The thixotropic thickener is selected from at least one of an alkali swelling thickener, an associative thickener, and a cellulose thickener; the weight of the thixotropic thickener is 0.01-2% of the total weight of the raw materials; The emulsifier is selected from at least one of fatty alcohol polyoxyethylene ether sulfate sodium salt, sulfosuccinate, branched dodecylbenzene sulfonic acid sodium salt, EO / PO polyether block copolymer, fatty alcohol ethoxylate, and aromatic alcohol ethoxylate.

2. The water-based advertising pressure-sensitive adhesive with excellent wetting properties according to claim 1, characterized in that: The weight of the thixotropic thickener is 0.1-0.8% of the total weight of the raw materials.

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