Water-resistant plastic flocking latex emulsion, and preparation method and application thereof

Abstract

The present application relates to the technical field of adhesive, disclose a kind of water-resistant plastic flocking latex emulsion and its preparation method and application, the flocking latex emulsion includes styrene, isooctyl acrylate or 2-ethylhexyl methacrylate, unsaturated organic acid, hydroxyethyl acrylate, diacetone acrylamide, adipic acid dihydrazide, initiator, reactive emulsifier, water.The emulsion is reasonably compounded by rigid and flexible monomer, so that the polymer has suitable glass transition temperature, so that the polymer can be fully film.Formed by isooctyl acrylate or 2-ethylhexyl methacrylate of long-chain ester, provide excellent water resistance for polymer.The carboxyl in unsaturated organic acid and the hydroxyl in hydroxyethyl acrylate can improve the adhesion and binding force of the polymer to the plastic substrate.Add DAAM and ADH, crosslinking occurs between emulsion particles, which is beneficial to improve the water resistance of latex film.Add reactive emulsifier, which can reduce the probability of water molecules invading the latex film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesives, in particular to a water-resistant plastic flocking latex emulsion and a preparation method and application thereof. BACKGROUND

[0002] The existing flocking latex emulsion generally improves adhesion by self-crosslinking of N-hydroxymethyl acrylamide and hydroxyl groups provided by hydroxyethyl acrylate, but N-hydroxymethyl acrylamide releases formaldehyde, which exceeds the standard when used for ABS plastic children's toy flocking or PVC cosmetic packaging box flocking, so more and more flocking latex emulsions tend to be formaldehyde-free. The hydroxyl groups of hydroxyethyl acrylate can improve adhesion, but the hydroxyl groups do not achieve a high level of peel strength after flocking on a plastic substrate with low surface energy, and the hydroxyl groups themselves are hydrophilic groups, and the water resistance is generally poor, and the peel strength will decrease significantly after soaking in water, causing problems such as hair loss or whole flocking falling off; and the existing flocking latex emulsion is generally synthesized using an anionic emulsifier, and the emulsifier, as a water-soluble small molecule, is easily invaded by water under the condition of 60℃ warm water, resulting in poor water resistance.

[0003] It can be seen that the prior art still needs to be improved and improved. SUMMARY

[0004] In view of the deficiencies of the prior art described above, the purpose of the present application is to provide a water-resistant plastic flocking latex emulsion and a preparation method and application thereof, aiming to solve the problem that after the plastic substrate is coated with the flocking latex emulsion and the surface of the plastic substrate is flocked, the flocking latex emulsion has poor water resistance, causing the flocking on the surface of the plastic substrate to have problems such as hair loss or whole flocking falling off.

[0005] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] A water-resistant plastic flocking latex emulsion, by weight, comprises the following components: 30-40 parts of styrene, 20-30 parts of isooctyl acrylate or 2-ethylhexyl methacrylate, 3-5 parts of unsaturated organic acid, 0.5-1 part of hydroxyethyl acrylate, 0.1-0.3 part of diacetone acrylamide, 0.05-0.15 part of adipic acid dihydrazide, 0.2-0.3 part of initiator, 1-1.4 parts of reactive emulsifier, and 100-110 parts of water.

[0007] The water-resistant plastic flocking latex emulsion, wherein the reactive emulsifier is an allyl polyoxyethylene ether sulfate.

[0008] The water-resistant plastic flocking latex emulsion, wherein the unsaturated organic acid is one or more of acrylic acid, methacrylic acid, and maleic anhydride.

[0009] The water-resistant plastic flocking latex emulsion, wherein the initiator is one or more of sodium persulfate, ammonium persulfate and potassium persulfate.

[0010] The water-resistant plastic flocking latex emulsion, wherein the water-resistant plastic flocking latex emulsion further comprises 0.1-0.3 parts by weight of a defoaming agent.

[0011] The water-resistant plastic flocking latex emulsion, wherein the defoaming agent is one or more of a polyether defoaming agent and a silicone defoaming agent.

[0012] A preparation method of a water-resistant plastic flocking latex emulsion, comprising the following steps:

[0013] Water and a reactive emulsifier are added to an emulsifying cylinder and stirred uniformly;

[0014] Preparation of a pre-emulsion: styrene, isooctyl acrylate or 2-ethylhexyl methacrylate, unsaturated organic acid, hydroxyethyl acrylate and diacetone acrylamide are added to the emulsifying cylinder and stirred uniformly for standby use;

[0015] Water and a reactive emulsifier are added to a reaction cylinder, stirring is started, and the temperature is raised to 85-90 DEG C;

[0016] 5% of the pre-emulsion of the total pre-emulsion is added to the reaction cylinder, 50% of the total initiator is added as the initiator, and the reaction is carried out for 0.5-1 h;

[0017] The temperature of the reaction cylinder is controlled at 85-88 DEG C, the remaining pre-emulsion and the remaining initiator are simultaneously added dropwise to the reaction cylinder, the dropwise adding time is 3-4 h; and after the dropwise adding is completed, the temperature is kept at 86-88 DEG C for 1 h;

[0018] When the temperature of the reaction cylinder is lowered to 50 DEG C, adipic acid dihydrazide and a defoaming agent are added to the reaction cylinder to obtain the water-resistant plastic flocking latex emulsion.

[0019] The application of the water-resistant plastic flocking latex emulsion, wherein the water-resistant plastic flocking latex emulsion is applied to a plastic substrate by spraying.

[0020] The application of the water-resistant plastic flocking latex emulsion, wherein the plastic substrate comprises ABS plastic and PCV plastic.

[0021] Beneficial effects:

[0022] The application provides a water-resistant plastic flocking latex emulsion, a preparation method and application thereof, and has the following advantages:

[0023] 1. By reasonable matching of rigid and flexible monomers, the polymer has a suitable glass transition temperature, so that the polymer can fully form a film. The long-chain ester of isooctyl acrylate or 2-ethylhexyl methacrylate provides excellent water resistance to the polymer. The carboxyl group in the unsaturated organic acid and the hydroxyl group in the hydroxyethyl acrylate can assist the bonding of the emulsion with the plastic substrate, and can improve the adhesion and bonding force of the polymer to the plastic substrate.

[0024] 2. Adding diacetone acrylamide and adipic acid dihydrazide to the flocking latex emulsion promotes the reaction between the ketone carbonyl and the hydrazine, cross-linking occurs between the emulsion particles, and the penetration of water between the emulsion particles is reduced, thereby improving the water resistance of the latex film layer.

[0025] 3. Adding a reactive emulsifier to the flocking latex emulsion, which contains a carbon-carbon double bond that can undergo polymerization with monomers, polymerizing onto the high molecular chain, after the reaction is complete, the latex particles have self-emulsifying properties, and can be used for uniform dispersion of oil phase monomers; the branched chain of the latex particles has large steric hindrance and strong hydrophobicity; and there is no free surfactant in the emulsion, which can greatly reduce the probability of water molecules invading the latex film, thereby greatly improving the warm water resistance of the latex film.

[0026] 4. The water-resistant flocking latex emulsion prepared is sprayed on the plastic substrate, and the water-resistant performance of the flocking product is good, especially it is not easy to fall off after being soaked in warm water at 60℃ for 2 hours, preventing the problem of the flocking product falling off or falling off in chunks due to poor water resistance of the latex film after soaking in water, causing the flocking adhesion to decrease significantly. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A schematic diagram for testing the number of rubs by an electric motor rub fastness tester.

[0028] Figure 2 A schematic diagram of the flocking completed by Example 1 and Comparative Example 4 and soaked in warm water at 60℃ for 2 hours.

[0029] Figure 3 A schematic diagram of the wet rub test completed by Example 1 and Comparative Example 4. DETAILED DESCRIPTION

[0030] The present application provides a water-resistant plastic flocking latex emulsion, its preparation method and application. In order to make the purpose, technical scheme and effect of the present application more clear and explicit, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the protection scope of the present application.

[0031] Please refer to Figure 1The present application provides a kind of water-resistant plastic flocking latex emulsion, comprising the following components: 30-40 parts of styrene, 20-30 parts of isooctyl acrylate or 2-ethylhexyl methacrylate (2-EHMA), 3-5 parts of unsaturated organic acid, 0.5-1 part of hydroxyethyl acrylate, 0.1-0.3 part of diacetone acrylamide (DAAM), 0.05-0.15 part of adipic acid dihydrazide (ADH), 0.2-0.3 part of initiator, 1-1.4 part of reactive emulsifier, 0.1-0.3 part of defoaming agent, and 100-110 parts of water.

[0032] Styrene contains benzene ring, which is a hard monomer with excellent water resistance, and can improve the hardness of the latex film layer; the carbon chain of isooctyl acrylate or 2-ethylhexyl methacrylate is longer than that of existing butyl acrylate, and the long carbon chain wraps the hydrophilic carboxyl and carbonyl inside, so the water resistance of the long carbon chain monomer is better than that of butyl acrylate. Isooctyl acrylate or 2-ethylhexyl methacrylate is a soft monomer with excellent water resistance as a long-chain ester with strong hydrophobicity, which can provide a basis for excellent water resistance of the polymer and improve the softness of the latex film layer. By reasonably compounding the hard monomer and soft monomer in the above range, the polymer has a suitable glass transition temperature (5-10℃), avoiding the problems of large brittleness of the glue film formed by high glass transition temperature and stickiness of the glue film formed by low glass transition temperature.

[0033] The water in the emulsion volatilizes to form a film, the unsaturated organic acid contains a large number of carboxyl functional groups, which can alkali swell and thicken, and the hydroxyethyl acrylate contains hydroxyl groups. Carboxyl and hydroxyl groups can assist the bonding of the emulsion with the plastic substrate, improve the adhesion and bonding force of the polymer to the plastic substrate, and make the emulsion firmly adhere to the surface of the plastic substrate. In some embodiments, the unsaturated organic acid is one or more of acrylic acid, methacrylic acid, and maleic anhydride.

[0034] The emulsion self-crosslinking reaction can occur at room temperature as the water volatilizes and the pH value decreases. DAAM provides a ketone carbonyl group, and ADH contains a hydrazine group, which can undergo a rapid chemical reaction at room temperature or in an acidic environment to generate a hydrazone compound by dehydration, thereby achieving room temperature crosslinking of the polymer emulsion. The self-crosslinking reaction of the emulsion occurs in the late film forming stage, promoting the reaction of ketone carbonyl and hydrazine, crosslinking between emulsion particles, reducing the penetration of water between emulsion particles, and thereby improving the water resistance of the latex film layer. The raw materials that provide ketone carbonyl groups also include methacrolein, methyl vinyl ketone, and acetoxyethyl methacrylate.

[0035] In some embodiments, the reactive emulsifier is an allyl polyoxyethylene ether sulfate. As a reactive anionic emulsifier, the allyl polyoxyethylene ether sulfate contains a carbon-carbon double bond which can polymerize with monomers to form a high molecular chain. After the reaction is completed, the latex particles have self-emulsifying properties and can be used for uniform dispersion of oil phase monomers. The branched chain of the latex particles has large steric hindrance and strong hydrophobicity. There is no free surfactant in the emulsion, which can greatly reduce the probability of water molecules invading the latex film, thereby greatly improving the water resistance of the latex film. The use of the reactive emulsifier alone in the present application is equivalent to the use of a combination of anionic emulsifiers, non-ionic emulsifiers and reactive emulsifiers in the prior art, and the water resistance is better.

[0036] In some embodiments, the initiator is one or more of sodium persulfate, ammonium persulfate, and potassium persulfate.

[0037] Optionally, the defoaming agent is one or more of a polyether defoaming agent and a silicone defoaming agent.

[0038] The present application also provides a preparation method of a water-resistant plastic flocking latex emulsion, comprising the following steps:

[0039] 30-35 parts of water and 0.8-1.0 parts of a reactive emulsifier are added to an emulsifying cylinder and stirred for 10 minutes.

[0040] Preparation of pre-emulsion: 30-40 parts of styrene, 20-30 parts of isooctyl acrylate or 2-ethylhexyl methacrylate, 3-5 parts of an unsaturated organic acid, 0.5-1 part of hydroxyethyl acrylate, and 0.1-0.3 parts of diacetone acrylamide are added to an emulsifying cylinder and stirred uniformly for standby use.

[0041] 60-65 parts of water and 0.2-0.3 parts of a reactive emulsifier are added to a reaction cylinder, and stirring is started, and the temperature is raised to 85-90°C.

[0042] 5% of the pre-emulsion based on the total amount of the pre-emulsion and 50% of the initiator based on the total amount of the initiator are added to the reaction cylinder, and the reaction is carried out for 0.5-1 h.

[0043] The temperature of the reaction cylinder is controlled at 85-88°C, and the remaining pre-emulsion and the remaining initiator dissolved in 10 parts of water are simultaneously added to the reaction cylinder, and the dropping time is 3-4 h; after the dropping is completed, the temperature is kept at 86-88°C for 1 h.

[0044] When the temperature of the reaction cylinder is reduced to 50°C, 0.05-0.15 parts of adipic acid dihydrazide and 0.1-0.3 parts of a defoaming agent are added to the reaction cylinder to prepare a water-resistant plastic flocking latex emulsion.

[0045] The application further provides application of the water-resistant plastic flocking latex emulsion, which is coated on the surface of a plastic substrate in a spraying manner, and then electrostatic flocking is performed, and the plastic substrate is dried in an oven at 60 DEG C after flocking.

[0046] Specifically, the plastic substrate can be ABS plastic, and the finished product can be applied to a child plastic toy. The plastic substrate can be PVC plastic, and the finished product can be applied to a packaging box of cosmetics, skin care products and the like, for improving the texture, aesthetic feeling and the like of the packaging box. The application adopts a spraying gluing manner, the viscosity is 500-1000 cps, the product has good wettability, and compared with a gluing process in which the emulsion is thickened first and then scraped, the product has poor wettability, and obvious shrinkage holes are prone to occur after gluing, and gluing cannot be performed at some positions.

[0047] In order to further illustrate the water-resistant plastic flocking latex emulsion, the preparation method and application thereof provided by the application, the following examples are provided.

[0048] Example 1

[0049] A water-resistant plastic flocking latex emulsion comprises the following components: 40 parts of styrene, 20 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 parts of hydroxyethyl acrylate, 0.2 parts of diacetone acrylamide (DAAM), 0.1 parts of adipic acid dihydrazide (ADH), 0.25 parts of sodium persulfate, 1 part of a reactive emulsifier (allyl polyoxyethylene ether sulfate), 0.1 parts of a polyether defoaming agent, and 110 parts of water.

[0050] The preparation method of the water-resistant plastic flocking latex emulsion comprises the following steps:

[0051] 35 parts of water and 0.8 parts of a reactive emulsifier are added to an emulsifying cylinder, and stirred for 10 minutes.

[0052] Preparation of the pre-emulsion: 40 parts of styrene, 20 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 parts of hydroxyethyl acrylate and 0.2 parts of diacetone acrylamide are added to the emulsifying cylinder, and stirred uniformly for standby use.

[0053] 65 parts of water and 0.2 parts of a reactive emulsifier are added to a reaction cylinder, and stirring is started, and the temperature is raised to 85 DEG C.

[0054] 5% of the pre-emulsion based on the total amount of the pre-emulsion and 50% of the initiator based on the total amount of the initiator are added to the reaction cylinder, and the reaction is performed for 0.5 h.

[0055] The temperature of the reaction cylinder is controlled at 86 DEG C, the remaining pre-emulsion and the remaining initiator dissolved in 10 parts of water are simultaneously added to the reaction cylinder, and the dropping time is 3.5 h; after the dropping is completed, the temperature is kept at 88 DEG C for 1 h.

[0056] When the reaction cylinder is cooled to 50℃, 0.1 part of adipic acid dihydrazide and 0.1 part of a defoaming agent are added into the reaction cylinder to prepare the water-resistant plastic flocking latex.

[0057] Example 2

[0058] A water-resistant plastic flocking latex includes the following components: 30 parts of styrene, 30 parts of isooctyl acrylate, 4 parts of methacrylic acid, 1 part of hydroxyethyl acrylate, 0.25 parts of diacetone acrylamide (DAAM), 0.13 parts of adipic acid dihydrazide (ADH), 0.2 parts of an initiator ammonium persulfate, 1.2 parts of a reactive emulsifier (allyl polyoxyethylene ether sulfate), 0.2 parts of a silicone defoaming agent, and 100 parts of water.

[0059] A method for preparing the water-resistant plastic flocking latex includes the following steps:

[0060] 30 parts of water and 1.0 part of a reactive emulsifier are added into an emulsifying cylinder and stirred for 10 minutes.

[0061] Preparation of a pre-emulsion: 30 parts of styrene, 30 parts of isooctyl acrylate, 4 parts of methacrylic acid, 1 part of hydroxyethyl acrylate, and 0.25 parts of diacetone acrylamide are added into an emulsifying cylinder and stirred uniformly for standby.

[0062] 60 parts of water and 0.2 parts of a reactive emulsifier are added into a reaction cylinder, and stirring is started and the temperature is raised to 90℃.

[0063] 5% of the pre-emulsion of the total pre-emulsion and 50% of the initiator of the total initiator are added into the reaction cylinder, and the reaction is carried out for 0.5 hours.

[0064] The temperature of the reaction cylinder is controlled at 85℃, and the remaining pre-emulsion and the remaining initiator dissolved in 10 parts of water are simultaneously added into the reaction cylinder, and the dropping time is 4 hours; after the dropping is completed, the temperature is kept at 86℃ for 1 hour.

[0065] When the reaction cylinder is cooled to 50℃, 0.13 parts of adipic acid dihydrazide and 0.2 parts of a defoaming agent are added into the reaction cylinder to prepare the water-resistant plastic flocking latex.

[0066] Example 3

[0067] A water-resistant plastic flocking latex includes the following components: 35 parts of styrene, 25 parts of 2-ethylhexyl methacrylate (2-EHMA), 3 parts of maleic anhydride, 0.8 parts of hydroxyethyl acrylate, 0.15 parts of diacetone acrylamide (DAAM), 0.1 parts of adipic acid dihydrazide (ADH), 0.2 parts of an initiator potassium persulfate, 1.3 parts of a reactive emulsifier (allyl polyoxyethylene ether sulfate), 0.3 parts of a silicone defoaming agent, and 100 parts of water.

[0068] The preparation method of the water-resistant plastic flocking latex emulsion comprises the following steps:

[0069] 30 parts of water and 1.0 part of the reactive emulsifier were added into an emulsifying cylinder and stirred for 10 minutes.

[0070] Preparation of the pre-emulsion: 35 parts of styrene, 25 parts of 2-ethylhexyl methacrylate (2-EHMA), 3 parts of maleic anhydride, 0.8 parts of hydroxyethyl acrylate, and 0.15 parts of diacetone acrylamide were added into an emulsifying cylinder and stirred uniformly for standby use.

[0071] 60 parts of water and 0.3 parts of the reactive emulsifier were added into a reaction cylinder, and stirring was started, and the temperature was raised to 88°C.

[0072] 5% of the pre-emulsion based on the total amount of the pre-emulsion and 50% of the initiator based on the total amount of the initiator were added into the reaction cylinder, and the reaction was carried out for 1 hour.

[0073] The temperature of the reaction cylinder was controlled at 88°C, and the remaining pre-emulsion and the remaining initiator dissolved in 10 parts of water were simultaneously added into the reaction cylinder, and the dropping time was 3 hours; after the dropping was completed, the temperature was kept at 88°C for 1 hour.

[0074] When the temperature of the reaction cylinder was reduced to 50°C, 0.1 part of adipic acid dihydrazide and 0.3 parts of the defoaming agent were added into the reaction cylinder, and the water-resistant plastic flocking latex emulsion was prepared.

[0075] Comparative Example 1

[0076] A water-resistant plastic flocking latex emulsion comprises the following components: 40 parts of styrene, 20 parts of butyl acrylate, 5 parts of acrylic acid, 0.5 parts of hydroxyethyl acrylate, 0.2 parts of diacetone acrylamide (DAAM), 0.1 part of adipic acid dihydrazide (ADH), 0.25 parts of sodium persulfate, 1 part of the reactive emulsifier (allyl polyoxyethylene ether sulfate), 0.1 part of the polyether defoaming agent, and 110 parts of water.

[0077] The preparation method of Comparative Example 1 is basically the same as that of Example 1, except that the isooctyl acrylate in Example 1 is replaced by the butyl acrylate in Comparative Example 1.

[0078] Comparative Example 2

[0079] A water-resistant plastic flocking latex emulsion comprises the following components: 40 parts of styrene, 20 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 parts of hydroxyethyl acrylate, 0.2 parts of diacetone acrylamide (DAAM), 0.1 part of adipic acid dihydrazide (ADH), 0.25 parts of sodium persulfate, 1 part of the anionic emulsifier (dodecyl ammonium sulfate), 0.1 part of the polyether defoaming agent, and 110 parts of water.

[0080] The preparation method of Comparative Example 2 is basically the same as that of Example 1, except that the reactive emulsifier in Example 1 is replaced by ammonium lauryl sulfate in Comparative Example 2.

[0081] Comparative Example 3

[0082] A water-resistant plastic flocking latex solution includes the following components: 40 parts of styrene, 20 parts of isooctyl acrylate, 5 parts of acrylic acid, 0.5 parts of hydroxyethyl acrylate, 0.2 parts of diacetone acrylamide (DAAM), 0.1 parts of adipic acid dihydrazide (ADH), 0.25 parts of sodium persulfate, 1 part of an emulsifier compound product (an anionic emulsifier (ammonium lauryl sulfate), a non-ionic emulsifier (alkyl polyoxyethylene ether), a reactive emulsifier (allyl polyoxyethylene ether sulfate)), 0.1 parts of a polyether defoaming agent, and 110 parts of water.

[0083] The preparation method of Comparative Example 3 is basically the same as that of Example 1, except that the reactive emulsifier in Example 1 is replaced by the emulsifier compound product in Comparative Example 3.

[0084] Comparative Example 4

[0085] A commercially available flocking glue product produced by Ba Defu with a model number of AS8135 is used as Comparative Example 4, which uses a self-crosslinking technology of N-hydroxymethyl acrylamide and a hydroxypropyl acrylate technology.

[0086] Comparative Example 5

[0087] A commercially available flocking glue product produced by Yin Yang with a model number of RC2930 is used as Comparative Example 5, which uses a self-crosslinking technology of N-hydroxymethyl acrylamide and a hydroxypropyl acrylate technology.

[0088] Test

[0089] The flocking latex solution products prepared in Examples 1-3 and Comparative Examples 1-5 are sprayed on ABS plastic sheets, and then electrostatic flocking is performed. After flocking, the samples are dried in an oven at 60°C.

[0090] The flocking fastness test is performed according to the FZ / T 64011-2012 electrostatic flocking fabric standard, and the number of rubs is tested using a motorized crockmeter. It should be noted that the motorized crockmeter has a larger friction coefficient, so the number of rubs measured by the motorized crockmeter is much less than that measured by the Martindale method, but the comparison of the experimental results is more obvious.

[0091] The results are shown in the following table

[0092] Sample Dry rubs per time Wet rubs per time 60°C warm water wet rubs per time Example 1 1260 780 480 Example 2 1120 750 465 Example 3 1200 760 470 Comparative Example 1 1080 500 420 Comparative Example 2 1030 280 40 Comparative Example 3 1080 520 400 Comparative Example 4 860 320 50 Comparative Example 5 840 300 40

[0093] The content of styrene as hard monomer in Example 1 is higher, the glass transition temperature Tg in the formula is high, and the number of times of resistance to rubbing is the most. The content of isooctyl acrylate as soft monomer in Example 2 is higher, the glass transition temperature Tg in the formula is lower, so the number of times of resistance to rubbing of Example 2 decreases compared with Example 1. The content of hard monomer and soft monomer in Example 3 is between Example 1 and Example 2, so the number of times of resistance to rubbing is also between the values of Example 1 and Example 2.

[0094] Comparative Example 1 uses butyl acrylate instead of isooctyl acrylate, and its water resistance is poor, which is specifically manifested in the number of times of wet rubbing and the number of times of warm water wet rubbing. Comparative Example 2 uses ammonium lauryl sulfate instead of reactive emulsifier, and because the water resistance of anionic emulsifier is poor, the sample is almost not resistant to warm water. Comparative Example 3 uses a compound product of anionic emulsifier, nonionic emulsifier and reactive emulsifier as emulsifier, and compared with the use of anionic emulsifier alone, the number of times of resistance to rubbing is improved, but because there is still free surfactant, there is a migration process, so the number of times of resistance to rubbing is lower than that of Examples 1-3. Comparative Example 4 and Comparative Example 5 are both flocking glue composed of self-crosslinking of N-hydroxymethyl acrylamide and hydroxyethyl acrylate, and from the results in the above table, it can be seen that the sample is not resistant to warm water; and from the right graph of Figure 1, it can be seen that the sample of Comparative Example 4, which is sprayed with flocking glue that is not resistant to water after wet rubbing test, the flock on the surface is completely rubbed off. Figure 3

[0095] It can be understood that for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concepts of the present application, and all these changes or replacements shall belong to the protection scope of the present application.​

Claims

1. A water-resistant plastic flocking latex solution, characterized by, By weight parts, including the following components: 30-40 parts of styrene, 20-30 parts of isooctyl acrylate or 2-ethylhexyl methacrylate, 3-5 parts of unsaturated organic acid, 0.5-1 parts of hydroxyethyl acrylate, 0.1-0.3 parts of diacetone acrylamide, 0.05-0.15 parts of adipic acid dihydrazide, 0.2-0.3 parts of initiator, 1-1.4 parts of reactive emulsifier, and 100-110 parts of water; the reactive emulsifier is allyl polyoxyethylene ether sulfate; the unsaturated organic acid is one or more of acrylic acid, methacrylic acid, maleic anhydride; the glass transition temperature of the water-resistant plastic flocking latex is 5-10℃; the preparation method of the water-resistant plastic flocking latex comprises the following steps: Add water and reactive emulsifier to the emulsifying cylinder and stir evenly; Preparation of pre-emulsion: add styrene, isooctyl acrylate or 2-ethylhexyl methacrylate, unsaturated organic acid, hydroxyethyl acrylate, diacetone acrylamide into the emulsifying cylinder and stir evenly for standby; Add water and reactive emulsifier to the reaction cylinder, start stirring, and heat to 85-90℃; add 5% of the pre-emulsion to the total amount of pre-emulsion to the reaction cylinder, and then add 50% of the initiator to the total amount of initiator, and react for 0.5-1h; Control the temperature of the reaction cylinder at 85-88℃, and simultaneously add the remaining pre-emulsion and the remaining initiator to the reaction cylinder, the dropping time is 3-4h; after dropping, keep the temperature at 86-88℃ for 1h; When the reaction cylinder is cooled to 50℃, add adipic acid dihydrazide and defoaming agent to the reaction cylinder to prepare the water-resistant plastic flocking latex; the water-resistant plastic flocking latex is glued to the plastic substrate by spraying; the plastic substrate includes ABS plastic and PCV plastic.

2. The water-resistant plastic flocking latex emulsion of claim 1, wherein, The initiator is one or more of sodium persulfate, ammonium persulfate and potassium persulfate.

3. The water-resistant plastic flocking latex emulsion of claim 1, wherein, It also includes 0.1-0.3 parts of defoaming agent by weight.

4. The water-resistant plastic flocking latex emulsion of claim 3, wherein, The defoaming agent is one or more of polyether defoaming agent and silicone defoaming agent.

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