A PVC flooring filler adhesive, its preparation method and application

Abstract

This invention provides a PVC flooring filler adhesive, its preparation method, and its application, relating to the field of adhesive technology. The PVC flooring filler adhesive provided by this invention comprises the following components by weight percentage: 30-55% acrylic low-temperature pressure-sensitive adhesive emulsion, 5-25% cross-linked vinyl acetate emulsion, 1-11% alkali-soluble acrylic emulsion, 5-18% liquid rosin, 10-30% filler, and 0.1-1.0% cross-linking agent. The PVC flooring filler adhesive provided by this invention has a long open time (up to 2 hours or more) and can be applied at low temperatures (still able to be applied below 5°C), while also exhibiting excellent bonding strength. Example results show that the PVC flooring filler adhesive provided by this invention does not lift when applied to self-leveling cement floors after drying for 2-6 hours; it can be applied at temperatures as low as 5°C without rebound, and has good stringing properties; 90° peel strength >1.0 N / mm, shear strength >0.4 MPa.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, and more particularly to a PVC flooring filler adhesive, its preparation method, and its application. Background Technology

[0002] PVC flooring (polyvinyl chloride flooring) is an elastic floor covering material made primarily from polyvinyl chloride (PVC) resin, with added plasticizers, stabilizers, pigments, and other auxiliary materials, through calendering, coating, and lamination processes. During installation, PVC flooring needs to be adhered to the subfloor using adhesives. PVC flooring filler adhesive is a commonly used adhesive for installing PVC flooring.

[0003] Currently, PVC flooring filler adhesives on the market generally have insufficient open time. They typically require application within 20 minutes of being applied to the surface. If the temperature is too high or the surface absorbs water too quickly, the open time will be even shorter. However, when workers manually apply the adhesive, the drying time is often too long, or many factors can affect the process, making it difficult to control the drying time. This often results in the flooring being applied after the open time has elapsed, leading to a false bond. Over time, the PVC flooring is prone to warping and popping, resulting in poor adhesion. Furthermore, most filler adhesives on the market are quite hard, and in winter, the initial tack is too low, easily causing poor adhesion, resulting in warping, bulging, or rebound of the PVC flooring. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a PVC flooring filler adhesive, its preparation method, and its application. The PVC flooring filler adhesive provided by this invention has a long open time and can be bonded at low temperatures.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a PVC flooring filler adhesive, comprising the following components in weight percentage: The composition includes 30-55% acrylic low-temperature pressure-sensitive adhesive emulsion, 5-25% cross-linked vinyl acetate emulsion, 1-11% alkali-soluble acrylic emulsion, 5-18% liquid rosin, 10-30% filler, and 0.1-1.0% cross-linking agent; the glass transition temperature of the acrylic low-temperature pressure-sensitive adhesive emulsion is less than -50℃; the cross-linked vinyl acetate emulsion is a nonionic surfactant type emulsion; and the pH value of the PVC flooring filler adhesive is 7.0-8.5.

[0006] Preferably, the glass transition temperature of the crosslinked vinyl acetate emulsion is 25~32℃; the crosslinking agent used in the preparation of the crosslinked vinyl acetate emulsion includes one or more of N-hydroxymethylacrylamide, glycidyl methacrylate, vinyltrimethoxysilane, methacryloyloxypropyltrimethoxysilane, epoxy resin, silane coupling agent, acetylacetoxyethyl methacrylate, and diacetone acrylamide.

[0007] Preferably, the glass transition temperature of the alkali-soluble acrylate emulsion is -10℃ to 30℃, and the number average molecular weight of the alkali-soluble acrylate polymer in the alkali-soluble acrylate emulsion is 10,000 to 100,000.

[0008] Preferably, the viscosity of the liquid rosin at 25°C is 8000~50000 cps.

[0009] Preferably, the filler comprises one or more of calcium carbonate, kaolin, and silicon dioxide, and the particle size of the filler is 800-2000 mesh.

[0010] Preferably, the crosslinking agent includes one or more of silane coupling agents, titanate coupling agents, adipic dihydrazide, glutaraldehyde, polyamines, polyethyleneimine, and epoxy resins.

[0011] Preferably, the pH value of the PVC flooring filler adhesive is adjusted by adding an alkaline neutralizing agent.

[0012] Preferably, the PVC flooring filler adhesive further includes water, which gives the PVC flooring filler adhesive a viscosity of 8000~20000 cps at 25°C.

[0013] This invention provides a method for preparing the PVC flooring filler adhesive described in the above technical solution, comprising the following steps: A mixed emulsion was obtained by mixing a low-temperature pressure-sensitive acrylic emulsion, a cross-linked vinyl acetate emulsion, and an alkali-soluble acrylic emulsion and adjusting the pH value. The mixed emulsion, liquid rosin, filler and crosslinking agent are mixed to obtain the PVC floor filler adhesive.

[0014] This invention provides the application of the PVC flooring filler adhesive described in the above technical solutions or the PVC flooring filler adhesive prepared by the above technical solutions in the bonding of PVC flooring.

[0015] This invention provides a PVC flooring filler adhesive, comprising the following components in weight percentage: 30-55% acrylic low-temperature pressure-sensitive adhesive emulsion, 5-25% cross-linked vinyl acetate emulsion, 1-11% alkali-soluble acrylic emulsion, 5-18% liquid rosin, 10-30% filler, and 0.1-1.0% cross-linking agent; the glass transition temperature of the acrylic low-temperature pressure-sensitive adhesive emulsion is less than -50°C; and the pH value of the PVC flooring filler adhesive is 7.0-8.5. In this invention, the acrylic low-temperature pressure-sensitive adhesive emulsion provides high initial tack, stringing properties, and low-temperature adhesion after moisture drying, thus improving the open time of the PVC flooring filler adhesive; the cross-linked vinyl acetate emulsion provides further cross-linking with acrylic esters (including acrylic low-temperature pressure-sensitive adhesive emulsion and alkali-soluble acrylic ester emulsion) after moisture drying, improving cohesion and shear strength, while also enhancing its resistance to PVC flooring plasticizers; the liquid rosin provides initial tack and further improves the stringing properties, low-temperature performance, and plasticizer resistance of the filler adhesive; the alkali-soluble acrylic ester emulsion disperses the liquid rosin into an emulsion, improving the stability of the liquid rosin in the system; and due to the good water retention properties of the alkali-soluble acrylic ester solution, its water penetration and evaporation are slower, resulting in a longer open time; the filler reduces costs while improving cohesion and shear strength; the cross-linking agent further improves cohesion and shear strength after moisture evaporation. This invention, through the combined action of its components, provides a PVC flooring filler adhesive with a long open time (up to 2 hours or more) and the ability to be bonded at low temperatures (even below 5°C), while also exhibiting excellent bonding strength.

[0016] The results of the examples show that the PVC floor filler adhesive provided by the present invention can be dried on a self-leveling cement floor for 2-6 hours without peeling; it can be applied at temperatures as low as 5°C without rebounding, and has good stringing properties; the 90° peel strength is >1.0 N / mm and the shear strength is >0.4 MPa. Detailed Implementation

[0017] This invention provides a PVC flooring filler adhesive, comprising the following components in weight percentage: The composition includes 30-55% acrylic low-temperature pressure-sensitive adhesive emulsion, 5-25% cross-linked vinyl acetate emulsion, 1-11% alkali-soluble acrylic emulsion, 5-18% liquid rosin, 10-30% filler, and 0.1-1.0% cross-linking agent; the glass transition temperature of the acrylic low-temperature pressure-sensitive adhesive emulsion is less than -50℃; the cross-linked vinyl acetate emulsion is a nonionic surfactant type emulsion; and the pH value of the PVC flooring filler adhesive is 7.0-8.5.

[0018] Unless otherwise specified, all raw materials involved in this invention are commercially available products in the field.

[0019] The PVC flooring filler adhesive provided by this invention comprises 30-55% acrylic low-temperature pressure-sensitive adhesive emulsion, which can be 30%, 35%, 40%, 41%, 45%, 47%, 50%, 53%, or 54% by weight. In this invention, the acrylic low-temperature pressure-sensitive adhesive emulsion has a glass transition temperature of less than -50°C and can achieve initial tack to PVC flooring at temperatures ranging from 0 to -20°C (peel strength performance is >5N / 25mm for 20 minutes on a steel plate at -5°C). In this invention, the acrylic low-temperature pressure-sensitive adhesive emulsion is preferably a high-acid-value acrylic emulsion (neutralized to pH 8.5 or higher using ammonia, with a viscosity at least three times that at pH 7.0, and significant thickening after alkali neutralization), which provides good adhesion and crosslinking points to PVC and cement, while also providing thickening properties for alkali and dispersion properties for fillers (such as calcium carbonate) and liquid rosin. In this invention, the acrylate low-temperature pressure-sensitive adhesive latex is preferably selected from one or more of the following: Acronal CR330AP and Acronal ECR518 from BASF (China) Co., Ltd. (hereinafter referred to as "BASF"), CLA2026, CLA1032 and CLA1021 from Shanghai Zhenpin Chemical Technology Group Co., Ltd. (hereinafter referred to as "Shanghai Zhenpin Chemical"), and HG1205 and HG1203 from Guangzhou Huigu New Material Technology Co., Ltd. (hereinafter referred to as "Guangzhou Huigu").

[0020] The PVC flooring filler adhesive provided by this invention comprises 5-25% cross-linked vinyl acetate emulsion, which can be 5%, 10%, 11%, 15%, 16%, 20%, 23%, 24%, or 25% by weight. In this invention, the cross-linked vinyl acetate emulsion is a nonionic surfactant-type emulsion, which, compared to PVA-protected vinyl acetate emulsion, can improve the open time of the PVC flooring filler adhesive. In this invention, the glass transition temperature of the cross-linked vinyl acetate emulsion is preferably 25-32°C; the cross-linking agent used in preparing the cross-linked vinyl acetate emulsion preferably includes one or more of N-hydroxymethylacrylamide, glycidyl methacrylate, vinyltrimethoxysilane, methacryloyloxypropyltrimethoxysilane, epoxy resin, silane coupling agent, acetylacetoxyethyl methacrylate, and diacetone acrylamide (the amount of cross-linking agent added is generally 0.5-3.0% of the monomer mass). In this invention, the cross-linked vinyl acetate emulsion is preferably selected from one or more of the following: Henkel (China) Investment Co., Ltd. (hereinafter referred to as "Henkel")'s N57 and N54, and Shanghai Zhenpin Chemical Technology Group Co., Ltd. (hereinafter referred to as "Shanghai Zhenpin Chemical")'s FG8071.

[0021] The PVC flooring filler adhesive provided by this invention comprises 1-11% alkali-soluble acrylic emulsion by weight percentage, which can be 1%, 2%, 3%, 4%, 4.5%, 5%, 5.5%, 6%, 10%, or 11%. In this invention, the glass transition temperature of the alkali-soluble acrylic emulsion is preferably -10℃ to 30℃, and the number-average molecular weight of the alkali-soluble acrylic polymer in the alkali-soluble acrylic emulsion is preferably 10,000 to 100,000. In this invention, the alkali-soluble acrylic emulsion is a high acid value (acid value 60-300 mg KOH / g) low molecular weight polyacrylate emulsion, which becomes transparent after neutralization with alkalis such as ammonia or sodium hydroxide. In this invention, the alkali-soluble acrylic emulsion is preferably selected from one or more of the following: CLA3061 and CLA3062 from Shanghai Zhenpin Chemical Technology Group Co., Ltd. (hereinafter referred to as "Shanghai Zhenpin Chemical"), and PM6110-21A from Henkel (China) Investment Co., Ltd. (hereinafter referred to as "Henkel").

[0022] The PVC flooring filler adhesive provided by this invention comprises 5-18% liquid rosin, which can be 5%, 6%, 10%, 12%, 15%, 16%, 17%, or 18% by weight. In this invention, the viscosity of the liquid rosin at 25°C is preferably 8000-50000 cps, and the liquid rosin is a high-viscosity liquid rosin; the liquid rosin can be pure liquid rosin resin, or a liquid rosin resin obtained by dissolving solid rosin in a high-boiling-point solvent. The amount of liquid rosin added in the PVC flooring filler adhesive of this invention is reduced by 30-40% compared to the amount of liquid rosin added in existing PVC flooring filler adhesive formulations.

[0023] The PVC flooring filler adhesive provided by this invention comprises 10-30% filler, which can be 10%, 11%, 12%, 15%, 16%, 19%, 20%, 25%, or 30% by weight. In this invention, the filler preferably comprises one or more of calcium carbonate, kaolin, and silica, and the particle size of the filler is preferably 800-2000 mesh. In this invention, the filler can improve the hardness and cohesive strength of the adhesive film.

[0024] The PVC flooring filler adhesive provided by the present invention includes 0.1 to 1.0% crosslinking agent by weight percentage, which can be 0.1%, 0.5%, 0.6% or 1.0%. In this invention, the crosslinking agent preferably includes one or more of silane coupling agents, titanate coupling agents, adipic dihydrazide (ADH), glutaraldehyde, polyamines, polyethyleneimine, and epoxy resins. The silane coupling agent can be an aminosilane coupling agent and / or an epoxysilane coupling agent. The aminosilane coupling agent can be KH550, and the epoxysilane coupling agent can be KH560. The titanate coupling agent can be one or more of KR-TTS (isopropyltriisostearoyl titanate), KR-138S (di(dioctylpyrophosphoyloxy)hydroxyacetate titanate), and KR-41B (tetraisopropyl di(dioctyl phosphite) titanate) from Kenrich Corporation. The polyamine can be one or more of diethylenetriamine, triethylenetetraamine, and polyetheramines. The epoxy resin can be E51 and / or E54.

[0025] The PVC flooring filler adhesive provided by the present invention preferably includes 0.05-1% additives, which can be 0.2-0.5%, by weight percentage. In the present invention, the additives preferably include one or more of dispersants, defoamers, plasticizers, and preservatives. The present invention does not have any special requirements for the dispersants, defoamers, plasticizers, and preservatives; dispersants, defoamers, plasticizers, and preservatives well known to those skilled in the art can be used.

[0026] In this invention, the pH value of the PVC flooring filler adhesive is preferably adjusted by adding an alkaline neutralizing agent. The alkaline neutralizing agent preferably includes one or more of ammonia, sodium hydroxide solution, potassium hydroxide solution, and organic amines. The organic amine can be one or more of 2-amino-2-methyl-1-propanol (AMP95), diethanolamine, triethanolamine, and dimethylethanolamine. In addition to adjusting the pH, the alkaline neutralizing agent also helps to improve the viscosity stability.

[0027] In this invention, the PVC flooring filler adhesive preferably includes water, and the water preferably makes the viscosity of the PVC flooring filler adhesive at 25°C 8000~20000cps, which can be 10000cps.

[0028] Currently, existing PVC flooring filler adhesive formulations often employ high-Tg base emulsions to achieve higher pull-out strength and stringing properties. These include non-pressure-sensitive stringing or high-cohesion acrylic emulsions, styrene-butadiene emulsions, and VAE emulsions. While these emulsions offer high cohesive strength, their open times are relatively short. Excessive drying time leads to excessive surface moisture evaporation, reducing the plasticizing effect of water and causing a sharp drop in initial tack. This results in flooring with high rebound force easily springing apart. Furthermore, due to the excessively high Tg, the chain segments harden at low temperatures, completely losing pressure sensitivity. Consequently, even when the moisture has not yet evaporated and the surface is semi-dry, the initial tack remains too poor, causing the flooring to spring apart. To extend the open time, some existing technologies add moisturizing glycerin to the formulation; however, the addition of large amounts of glycerin significantly reduces cohesive strength. To address low-temperature adhesion performance, existing technologies have adjusted the Tg of the system by increasing the amount of plasticizer or liquid rosin. However, this approach can easily lead to an imbalance in the cohesion of the entire system. The film may appear to have good strength in cold weather, but in summer, due to the high plasticizer content in the system and the poor plasticizer resistance of ordinary acrylic emulsions, insufficient cohesion and stringing can occur at high temperatures.

[0029] The PVC flooring filler adhesive provided by this invention comprises the following: the acrylic low-temperature pressure-sensitive adhesive emulsion provides high initial tack, stringing properties, and low-temperature adhesion after moisture drying; the cross-linked vinyl acetate emulsion provides further cross-linking with the acrylic ester after moisture drying, improving cohesion and shear strength, while also enhancing its resistance to PVC flooring plasticizers; the liquid rosin provides initial tack and further improves the stringing properties, low-temperature performance, and plasticizer resistance of the filler adhesive; the alkali-soluble acrylic emulsion disperses the liquid rosin and filler, improving their stability in the system; and due to the good water retention properties of the alkali-soluble acrylic solution, its water penetration and evaporation are slower, resulting in a longer open time and reducing the impact of small-molecule humectants like glycerin on cohesion; the filler reduces costs while improving cohesion and shear strength; and the cross-linking agent further enhances cohesion and shear strength after moisture evaporation.

[0030] This invention, through the synergistic effect of its components, provides a PVC flooring filler adhesive with a long open time (up to 2 hours or more) and low-temperature adhesion (it can still be bonded at temperatures below 5°C), while also exhibiting excellent bonding strength. Furthermore, the PVC flooring filler adhesive formulation of this invention is resistant to plasticizers, preventing a decrease in cohesion and subsequent stringing or breakage due to plasticizer migration from the PVC flooring.

[0031] This invention provides a method for preparing the PVC flooring filler adhesive described in the above technical solution, comprising the following steps: A mixed emulsion was obtained by mixing a low-temperature pressure-sensitive acrylic emulsion, a cross-linked vinyl acetate emulsion, and an alkali-soluble acrylic emulsion and adjusting the pH value. The mixed emulsion, liquid rosin, filler and crosslinking agent are mixed to obtain the PVC floor filler adhesive.

[0032] In this invention, the pH value is adjusted by adding an alkaline neutralizing agent, which is the same as the alkaline neutralizing agent in the above-mentioned technical solution. In this invention, the pH adjustment aims to obtain a mixed emulsion with a pH value of 7.0-8.5. This invention mixes an acrylic low-temperature pressure-sensitive adhesive emulsion, a cross-linked vinyl acetate emulsion, and an alkali-soluble acrylic emulsion, and first adjusts the pH value. Because the alkali-soluble acrylic emulsion has a lower pH, adjusting the pH in advance improves mechanical stability, and after neutralization, it has a high carboxyl content and high viscosity, providing a certain dispersion effect on rosin and fillers. After subsequently adding rosin, fillers, and cross-linking agents, the pH of the system will change slightly, but not significantly. This is mainly because the filler itself has a pH of around 8.0, and the large amount added acts as a pH buffer, thus ultimately obtaining a PVC flooring filler adhesive with a pH value of 7.0-8.5.

[0033] The present invention preferably involves adding liquid rosin, filler, and crosslinking agent to the mixed emulsion under high-speed stirring.

[0034] In this invention, when the PVC flooring filler adhesive further includes additives and water, after the mixed emulsion, liquid rosin, filler, and crosslinking agent are mixed, it is preferable to add additives and water to the mixture. Specifically, the mixed emulsion, liquid rosin, filler, and crosslinking agent can be stirred at high speed for 20 minutes, and then the additives and water can be added to the resulting mixture. In this invention, after adding the additives and water, it is preferable to filter the resulting mixture and discharge it.

[0035] This invention provides the application of the PVC flooring filler adhesive described in the above technical solutions, or the PVC flooring filler adhesive prepared by the above preparation methods, in the bonding of PVC flooring. In this invention, the bonding refers to bonding the PVC flooring to a surface, which can be a self-leveling cement surface or a ceramic tile surface. This invention does not impose any special requirements on the application method; any application method well-known to those skilled in the art can be used.

[0036] To further illustrate the present invention, the following detailed description, in conjunction with examples, of the PVC flooring filler adhesive provided by the present invention, its preparation method, and its application, but these should not be construed as limiting the scope of protection of the present invention.

[0037] Example 1 A PVC flooring filler adhesive, prepared by the following method: Take 45g of acrylate low-temperature pressure-sensitive adhesive emulsion CLA2026 (Shanghai Zhenpin Chemical, minimum application temperature -5℃), 15g of epoxy crosslinked vinyl acetate emulsion N54 (Henkel), and 5g of alkali-soluble acrylic emulsion CLA3061 (Shanghai Zhenpin Chemical, glass transition temperature 20℃, molecular weight approximately 90,000). Neutralize with 1g of APM95. Add 15g of calcium carbonate, 15g of liquid rosin solution (pure liquid rosin resin, 826T from Wuzhou Feizhuo Chemical Products Co., Ltd.), and 0.5g of aminosilane coupling agent (KH550) under high-speed stirring. After stirring at high speed for 20 minutes, add 0.2g of defoamer (mineral oil defoamer DFC215, Shanghai Zhenpin Chemical) and 0.2g of preservative (D7GH, Lanxess Chemical (China) Co., Ltd.) and add an appropriate amount of water to adjust the viscosity to 10,000 cps. Filter and discharge to obtain PVC floor filler adhesive.

[0038] The PVC floor filler adhesive of Example 1 can be dried on a self-leveling cement floor for 3 hours before being applied without lifting; it can be applied at a minimum temperature of 3°C in winter without rebound and has excellent stringing properties; its 90° peel strength is >1.1 N / mm and shear strength is >0.4 MPa (refer to JC / T 550-2019 "Adhesives for Polyvinyl Chloride Flooring" test (ordinary adhesive, standard condition (tested after 24 hours of drying at room temperature after application), the substrate is a cement flat surface for applying PVC plastic flooring)).

[0039] Example 2 A PVC flooring filler adhesive, prepared by the following method: Take 50g of acrylic low-temperature pressure-sensitive adhesive emulsion HG1203 (Guangzhou Huigu, minimum application temperature -20℃), 20g of silane-crosslinked vinyl acetate emulsion N57 (Henkel), and 5g of alkali-soluble acrylic emulsion CLA3062 (Shanghai Zhenpin Chemical, glass transition temperature 10℃, molecular weight approximately 70,000). Neutralize with 1g of APM95. Add 12g of calcium carbonate, 12g of liquid rosin solution (pure liquid rosin resin, 826T from Wuzhou Feizhuo Chemical Products Co., Ltd.), and 0.5g of epoxy silane coupling agent (KH560) under high-speed stirring. After stirring at high speed for 20 minutes, add 0.2g of defoamer (mineral oil defoamer DFC215, Shanghai Zhenpin Chemical) and 0.2g of preservative (D7GH, Lanxess Chemical (China) Co., Ltd.) and add water to adjust the viscosity to 10,000 cps. Filter and discharge to obtain PVC floor filler adhesive.

[0040] The PVC floor filler adhesive of Example 2 can be dried on a self-leveling cement floor for 6 hours before being applied without lifting. It can be applied in winter at a minimum temperature of 0°C without rebounding. It has excellent stringing properties, with a 90° peel strength >1.0 N / mm and a shear strength >0.4 MPa (test conditions are the same as in Example 1).

[0041] Example 3 A PVC flooring filler adhesive, prepared by the following method: Take 35g of acrylic low-temperature pressure-sensitive adhesive latex HG1205 (Guangzhou Huigu, minimum bonding temperature -15℃, solid content 60%), 20g of N-hydroxymethylacrylamide crosslinked vinyl acetate latex FG8071 (glass transition temperature 32℃, solid content 52%), and 4g of alkali-soluble acrylic latex PM6110-21A (Henkel). Neutralize with 1g of APM95. Under high-speed stirring, add 10g of calcium carbonate, 15g of liquid rosin solution (pure liquid rosin resin, 826T from Wuzhou Feizhuo Chemical Products Co., Ltd.), and 0.5g of polyethyleneimine crosslinking agent (Polymin). After stirring at high speed for 20 minutes, add 0.2g of defoamer (mineral oil defoamer DFC215, Shanghai Zhenpin Chemical) and 0.2g of preservative (D7GH, Lanxess Chemical (China) Co., Ltd.), and add water to adjust the viscosity to 10000cps. Filter the mixture to obtain PVC floor filler adhesive.

[0042] The PVC floor filler adhesive of Example 3 can be dried on a self-leveling cement floor for 4 hours before being applied without lifting. It can be applied at a minimum temperature of 2°C in winter without rebounding. It has excellent stringing properties, with a 90° peel strength >1.0 N / mm and a shear strength >0.4 MPa (test conditions are the same as in Example 1).

[0043] Example 4 A PVC flooring filler adhesive, prepared by the following method: Take 50g of acrylic low-temperature pressure-sensitive adhesive emulsion Acronal ECR518 (BASF, minimum bonding temperature 0℃, solid content 60%), 10g of epoxy crosslinked vinyl acetate emulsion N54 (Henkel, glass transition temperature 30℃, solid content 50%), and 10g of alkali-soluble acrylic emulsion CLA3061 (Shanghai Zhenpin Chemical, glass transition temperature 20℃, molecular weight approximately 90,000). Neutralize with 1g of APM95. Add 18g of calcium carbonate, 5g of liquid rosin solution (pure liquid rosin resin, 826T from Wuzhou Feizhuo Chemical Products Co., Ltd.), and 0.5g of adipic acid dihydrazide under high-speed stirring for 20min. Add 0.2g of defoamer (mineral oil defoamer DFC215, Shanghai Zhenpin Chemical) and 0.2g of preservative (D7GH, Lanxess Chemical (China) Co., Ltd.) and add water to adjust the viscosity to 10,000cps. Filter and discharge to obtain PVC floor filler adhesive.

[0044] The PVC floor filler adhesive of Example 4 can be dried on a self-leveling cement floor for 2 hours before being applied without lifting. It can be applied in winter at a minimum temperature of 8°C without rebounding. It has good stringing properties, with a 90° peel strength >1.2N / mm and a shear strength >0.45MPa (test conditions are the same as in Example 1).

[0045] Comparative Example 1 The epoxy-crosslinked vinyl acetate emulsion N54 in Example 1 is omitted, and the rest is the same as in Example 1.

[0046] The 90° peel strength of the PVC flooring filler adhesive in Comparative Example 1 decreased to below 1.0 N / mm, and the shear strength decreased to below 0.25 MPa.

[0047] Comparative Example 2 The alkali-soluble acrylic emulsion CLA3061 in Example 1 is omitted, and the rest is the same as in Example 1.

[0048] The open time of the PVC floor filler adhesive in Comparative Example 2 was shortened to 1 hour.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A PVC flooring filler adhesive, characterized in that, The components include the following components by mass percentage: The composition includes 30-55% acrylic low-temperature pressure-sensitive adhesive emulsion, 5-25% cross-linked vinyl acetate emulsion, 1-11% alkali-soluble acrylic emulsion, 5-18% liquid rosin, 10-30% filler, and 0.1-1.0% cross-linking agent; the glass transition temperature of the acrylic low-temperature pressure-sensitive adhesive emulsion is less than -50℃; the cross-linked vinyl acetate emulsion is a nonionic surfactant type emulsion; and the pH value of the PVC flooring filler adhesive is 7.0-8.

5.

2. The PVC flooring filler adhesive according to claim 1, characterized in that, The glass transition temperature of the cross-linked vinyl acetate emulsion is 25~32℃; the cross-linking agent used in the preparation of the cross-linked vinyl acetate emulsion includes one or more of N-hydroxymethylacrylamide, glycidyl methacrylate, vinyltrimethoxysilane, methacryloyloxypropyltrimethoxysilane, epoxy resin, silane coupling agent, acetylacetoxyethyl methacrylate and diacetone acrylamide.

3. The PVC flooring filler adhesive according to claim 1, characterized in that, The glass transition temperature of the alkali-soluble acrylate emulsion is -10℃ to 30℃, and the number average molecular weight of the alkali-soluble acrylate polymer in the alkali-soluble acrylate emulsion is 10,000 to 100,000.

4. The PVC flooring filler adhesive according to claim 1, characterized in that, The viscosity of the liquid rosin at 25°C is 8000~50000cps.

5. The PVC flooring filler adhesive according to claim 1, characterized in that, The filler includes one or more of calcium carbonate, kaolin, and silicon dioxide, and the particle size of the filler is 800-2000 mesh.

6. The PVC flooring filler adhesive according to claim 1, characterized in that, The crosslinking agent includes one or more of silane coupling agents, titanate coupling agents, adipic dihydrazide, glutaraldehyde, polyamines, polyethyleneimine, and epoxy resins.

7. The PVC flooring filler adhesive according to claim 1, characterized in that, The pH value of the PVC flooring filler adhesive is adjusted by adding an alkaline neutralizing agent.

8. The PVC flooring filler adhesive according to claim 1, characterized in that, The PVC flooring filler adhesive also includes water, which gives the PVC flooring filler adhesive a viscosity of 8000~20000cps at 25°C.

9. A method for preparing the PVC flooring filler adhesive according to any one of claims 1 to 8, characterized in that, Includes the following steps: A mixed emulsion was obtained by mixing a low-temperature pressure-sensitive acrylic emulsion, a cross-linked vinyl acetate emulsion, and an alkali-soluble acrylic emulsion and adjusting the pH value. The mixed emulsion, liquid rosin, filler and crosslinking agent are mixed to obtain the PVC floor filler adhesive.

10. The application of the PVC flooring filler adhesive according to any one of claims 1 to 8 or the PVC flooring filler adhesive prepared by the preparation method according to claim 9 in the bonding of PVC flooring.