CN-121991607-A - Composition for preparing vinyl acetate-ethylene copolymer emulsion for tile adhesive, copolymer emulsion, preparation method and application thereof

Abstract

The invention relates to the technical field of vinyl acetate-ethylene copolymer emulsion, and discloses a composition and copolymer emulsion for preparing vinyl acetate-ethylene copolymer emulsion for tile glue, and a preparation method and application thereof, wherein the composition comprises, by weight, 24-26 parts of vinyl acetate, 6-8 parts of ethylene, 26-28 parts of pre-emulsified monomer, 2.2-2.4 parts of re-polymerized graft emulsion and 39-40 parts of water. The vinyl acetate-ethylene copolymer emulsion is applied to the tile adhesive, has the advantages of good water resistance and high strength, and can be used in the field of tile adhesives.

Inventors

• LIU JINGJING
• QIU XUAN
• XU XIAOSONG
• LI HUIRONG
• WU JIANGHONG

Assignees

• 中国石油化工股份有限公司
• 中国石化集团重庆川维化工有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (10)

1. 1. A composition for preparing a vinyl acetate-ethylene copolymer emulsion for tile adhesives, which is characterized by comprising the following components in parts by mass: 24-26 parts of vinyl acetate; 6-8 parts by weight of ethylene; 26-28 parts by weight of pre-emulsified monomer; 2.2 to 2.4 weight portions of graft emulsion; 39-40 parts of water.
2. 2. The composition of claim 1, wherein the composition further comprises: 0.06-0.08 parts by weight of cellulose; 0.9 to 1.1 weight portions of polyvinyl alcohol; 1.9-2.1 parts by weight of emulsifying agent; 0.21-0.23 part by weight of reducing agent; 0.09-0.11 part by weight of an oxidant; 0.25-0.27 parts by weight of pH regulator; 0.02-0.04 parts by weight of post-treatment agent.
3. 3. The composition of claim 1 or 2, wherein the pre-emulsified monomer is one or more of acrylates, vinyl versatate and vinyl acetate; Preferably, the acrylic ester is selected from one or more of methyl methacrylate, methyl acrylate, ethyl acrylate and butyl acrylate; and/or, the repolymerized grafting emulsion is a styrene-butadiene emulsion; and/or the emulsifier is selected from one or more of octyl phenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether; and/or, the cellulose is hydroxy cellulose.
4. 4. A composition according to any one of claims 1 to 3, wherein the protective colloid is polyvinyl alcohol; preferably, the polyvinyl alcohol has a polymerization degree of 500 to 2000; preferably, the alcoholysis degree of the polyvinyl alcohol is 80 to 99.5%.
5. 5. A method for preparing a copolymer emulsion using the composition for preparing a vinyl acetate-ethylene copolymer emulsion for tile adhesives according to any one of claims 1 to 4, comprising: (1) Mixing cellulose, polyvinyl alcohol, an emulsifier, vinyl acetate, ethylene and water in a contact manner; (2) Contacting each reactant in the step (1) with an oxidant, a reducing agent, a part of initiator and a pre-emulsified monomer at a certain temperature and pressure to perform a first reaction; (3) And (3) contacting the product obtained in the step (2) with another part of initiator to perform a second reaction and defoaming treatment, and contacting the reaction product with a repolymerized grafting emulsion, a treatment auxiliary agent and a pH regulator to perform post-treatment to obtain the vinyl acetate-ethylene copolymer emulsion.
6. 6. The method according to claim 5, wherein in the step (2), the certain temperature and pressure conditions include a temperature of 54-62 ℃ and a pressure of 3-3.3MPa; And/or the conditions of the first reaction comprise the temperature of 70-74 ℃, the pressure of 5-5.5MPa and the time of 45-55min; And/or the addition rates of the oxidant and the reducing agent are the same and are 10-13kg/min.
7. 7. The process according to claim 5, wherein in step (3), the conditions of the second reaction include a temperature of 75 to 78℃and a pressure of 1.4 to 1.5MPa.
8. 8. A vinyl acetate-ethylene copolymer emulsion for tile adhesives prepared by the method of any one of claims 5-7.
9. 9. The copolymer emulsion according to claim 8, wherein the vinyl acetate-ethylene copolymer emulsion has a viscosity of 1000 to 2500mpa.s and a solid content of 60 to 61%; Preferably, the density of the vinyl acetate-ethylene copolymer emulsion is 1.06-1.08g/cm 3 ; Preferably, the strength of the film of the vinyl acetate-ethylene copolymer emulsion is 10-12MPa; preferably, the elongation of the film of the vinyl acetate-ethylene copolymer emulsion is 400 to 600%.
10. 10. Use of a vinyl acetate-ethylene copolymer emulsion according to claim 8 or 9 on tile glue.

Description

Composition for preparing vinyl acetate-ethylene copolymer emulsion for tile adhesive, copolymer emulsion, preparation method and application thereof Technical Field The invention relates to the technical field of vinyl acetate-ethylene copolymer emulsion, in particular to a composition for preparing vinyl acetate-ethylene copolymer emulsion for tile glue, a copolymer emulsion, a preparation method and application thereof. Background The raw materials of the rubber powder special for the traditional tile adhesive are provided by vinyl acetate-ethylene copolymer emulsion, and water is quickly evaporated under a high-speed spray drying device to be changed into redispersible emulsion powder. When the emulsion powder is reused, cellulose, cement, amylase, heavy calcium powder, water and the like are added and the ceramic tile forming glue is used for paving ceramic tiles. Along with the improvement of the living standard and the change of aesthetic ideas of people, the types of tiles are gradually various, large tiles become a trend, the quality of the tiles is increased, the common tile glue cannot bear the tile paving of large weight, meanwhile, some exterior wall tiles are affected by the environment of blowing, sun-drying and rain, the bonding strength is not high, the tiles are easy to slip and fall off, great potential safety hazards are caused, and the phenomena of slip and fall off and hollowing of the indoor wall tiles are also caused. CN113896485B is pretreated by a vibration mixing process through a cement inorganic binding material, an inorganic filler and a cellulose organic binding material. Disclosed is a high-strength tile adhesive, which has good fluidity, good adhesion ability in wet state, no sagging when stationary, good adhesion ability after solidification, and high mechanical strength. CN115572113B uses the aggregate production line of cement factories to recycle artificial machine-made sand and industrial waste mineral powder, and introduces geopolymer to improve the alkalinity of tile back glue, wherein the mineral powder and fly ash used are excited by dry powder water glass to form Sup>A hydrated calcium silicate (C-S-H) and hydrated sodium aluminosilicate (N-A-S-H) composite gel network structure. The mixing of the recycled stone powder fine aggregate and the artificial machine-made sand coarse aggregate fills pores with various sizes among the gels, so that the strength and the water resistance of the tile back adhesive are improved, and the adverse effect of large shrinkage of geopolymer is overcome. Provides a geopolymer tile gum, a preparation method and application thereof. CN115305016a discloses a two-component waterproof tile adhesive composition, which has the characteristics of strong adhesion capability and good anti-seepage effect through the synergistic effect of silicate solution, thickener, defoamer, water, talcum powder, sand, mineral powder and other components. Meanwhile, the composition has lower paint film shrinkage and better bonding effect, has stronger waterproof effect on the low-water-absorption ceramic tile, does not need to be matched with ceramic tile back glue when being applied to the low-water-absorption ceramic tile, saves cost, and can effectively reduce the phenomenon of shrinkage and brick falling of the paint film in the film forming process. Is suitable for tiles with low water absorption and tiles with high water absorption. The above patents all relate to tile adhesives, mainly to the development of downstream application technology of tile adhesives, and because of the higher requirements on the strength, humidity resistance and weather resistance of the tile adhesives in modern tile paving, a high-strength tile adhesive needs to be developed to simultaneously satisfy the dual promotion of the aesthetic and performance of the building. Disclosure of Invention The invention aims to overcome the defect that the intensity and the humidity resistance of tile glue are relatively poor in tile glue paving in the prior art, and provides a composition for preparing vinyl acetate-ethylene copolymer emulsion for tile glue, a copolymer emulsion, a preparation method and application thereof. In order to achieve the above object, the first aspect of the present invention provides a composition for preparing a vinyl acetate-ethylene copolymer emulsion for tile adhesives, wherein the composition comprises, in parts by mass: 24-26 parts of vinyl acetate; 6-8 parts by weight of ethylene; 26-28 parts by weight of pre-emulsified monomer; 2.2 to 2.4 weight portions of graft emulsion; 39-40 parts of water. In a second aspect, the present invention provides a method for preparing a copolymer emulsion using the composition for preparing a vinyl acetate-ethylene copolymer emulsion for tile adhesives, wherein the method comprises the following steps: (1) Mixing cellulose, polyvinyl alcohol, an emulsifier, vinyl acetate, ethylene and water in a contact manner; (2) Contac