CN-121991274-A - Composition for preparing vinyl acetate-ethylene copolymer emulsion for cable non-woven fabric, 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 of vinyl acetate-ethylene copolymer emulsion for preparing cable non-woven fabrics, a copolymer emulsion and a preparation method and application thereof, wherein the composition comprises 38-40 parts by weight of vinyl acetate, 13-15 parts by weight of ethylene, 2-4 parts by weight of protective colloid, 0.1-0.3 part by weight of foaming agent, 0.05-0.07 part by weight of foam stabilizer and 40-45 parts by weight of water. The vinyl acetate-ethylene copolymer emulsion has good foaming effect and foam stabilizing effect, and is widely used in the cable non-woven fabric manufacturing industry.

Inventors

• LIU JINGJING
• CAO YONG
• ZHANG BO
• LUO LIHUA
• 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 a cable nonwoven fabric, which is characterized by comprising the following components in parts by mass: 38-40 parts by weight of vinyl acetate; 13-15 parts by weight of ethylene; 2-4 parts by weight of protective colloid; 0.1-0.3 part by weight of foaming agent; 0.05-0.07 part by weight of foam stabilizer; 40-45 parts of water.
2. 2. The composition of claim 1, wherein the composition further comprises: 0.1-0.3 part by weight of emulsifying agent; 0.08-0.1 part by weight of reducing agent; 0.05-0.07 part by weight of oxidant; 0.04-0.06 weight parts 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 foaming agent is selected from one or more of sodium dodecyl sulfate, sodium hexadecyl benzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and triethylene diamine; And/or the foam stabilizer is selected from one or more of sodium carboxymethyl cellulose, polyacrylamide and dodecyl dimethyl amine oxide; And/or the emulsifier is selected from one or more of octyl phenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
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 of vinyl acetate-ethylene copolymer emulsion for cable nonwoven fabric according to any one of claims 1 to 4, characterized in that the method comprises: (1) Mixing protective colloid, emulsifier, foaming agent, part of vinyl acetate, part of ethylene and water in contact; (2) Contacting each reactant in the step (1) with an oxidant, a reducing agent, a part of an initiator, another part of vinyl acetate and another part of ethylene at a certain temperature and under a certain 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 treatment auxiliary agent, a pH regulator and a foam stabilizer to perform post-treatment to obtain the vinyl acetate-ethylene copolymer emulsion.
6. 6. A process according to claim 5, wherein the weight ratio of the amount of one portion of vinyl acetate to the amount of the other portion of vinyl acetate is (23-25): 14-16.
7. 7. 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 5.1-5.5MPa; And/or the conditions of the first reaction comprise the temperature of 70-74 ℃, the pressure of 7.8-8MPa and the time of 90-100min; and/or the addition rates of the oxidant and the reducing agent are the same and are 1-3kg/min; And/or in step (3), the conditions of the second reaction include a temperature of 75-78 ℃ and a pressure of 1.5-1.52MPa.
8. 8. A vinyl acetate-ethylene copolymer emulsion for a cable nonwoven fabric produced by the production method of any one of claims 5 to 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 55 to 60%; preferably, the foaming volume of the vinyl acetate-ethylene copolymer emulsion is 1 (10-15), and the foam breaking time is more than or equal to 3min; preferably, the glass transition temperature T g of the vinyl acetate-ethylene copolymer emulsion is-7 ℃ to-5 ℃; Preferably, the vinyl acetate-ethylene copolymer emulsion has a density of 1.06-1.08g/cm 3 .
10. 10. Use of a vinyl acetate-ethylene copolymer emulsion according to claim 8 or 9 in a cable nonwoven.

Description

Composition for preparing vinyl acetate-ethylene copolymer emulsion for cable non-woven fabric, 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 cable non-woven fabrics, a copolymer emulsion, a preparation method and application thereof. Background The cable is an indispensable conveying tool in urban power and communication lines, and the non-woven fabric is widely adopted due to the characteristics of short process flow, rapid production speed, high yield, low cost and the like. The cable non-woven fabric is mainly used in the manufacture of cables and wires, and has the effects of firstly preserving heat, reducing energy loss and heat loss of the cables, improving transmission efficiency and energy-saving effect of the cables, secondly preventing fire, slowing down the spreading speed of fire, reducing harmful gas and toxic smoke generated by the cables, protecting the cables and equipment, preventing the cables from being affected by rainwater, dew or groundwater and being corroded by moisture, prolonging the service life of the cables, simultaneously having an anti-corrosion function, preventing the cables from being corroded in the long-term use process, reducing maintenance cost, protecting the wires, avoiding the surfaces of the wires from being scratched or damaged, prolonging the service life of the wires and the like. The cable non-woven fabric is mainly composed of synthetic fibers and resin, and is prepared by mainly using an adhesive in the manufacturing process through a coating method, using the adhesive to enable a water-absorbing polymer to be attached to the non-woven fabric or through an impregnation method, enabling the non-woven fabric to enter an impregnating machine, carrying out adhesive on the non-woven fabric, and carrying out hot rolling and drying. The adhesive required by the two modes is a general vinyl acetate-ethylene copolymer emulsion, other fillers and process water, the sizing solid content is low, about 7-10%, the production efficiency is low, the roller is cleaned frequently, and the manual operation is complicated. CN102509594a discloses a flame-retardant binding belt for cables and a manufacturing method thereof, wherein the flame-retardant binding belt comprises a base material and flame-retardant glue outside the base material, and is characterized in that the flame-retardant glue is prepared by mixing polyacrylate emulsion, a flame retardant, a dispersing agent, an auxiliary agent and the like, stirring and sieving, and is combined with the base material in various modes of coating, dipping and the like. And then drying, slitting and packaging to obtain the finished product, wherein the manufacturing process is simple, the technical performance is stable and the production cost is reduced. CN111790311a discloses a method for producing emulsion for textile, which mainly uses acrylate emulsion and anion emulsification to obtain emulsion for textile. The emulsion for textile can be continuously produced by carefully selecting raw materials, optimizing the content of each raw material and adopting continuous production equipment, and the prepared emulsion for textile has good stability, high soaping fastness, high rubbing fastness and good water resistance. CN108642918a relates to the textile printing field, in particular to a composition for preparing a pigment printing adhesive, a pigment printing adhesive and a preparation method thereof. Mixing hard monomer, soft monomer, functional monomer and crosslinking monomer, dissolving initiator in partial water, mixing aqueous polyurethane emulsion with the rest water, adding monomer mixture and initiator solution to obtain reaction product, adding aqueous polyurethane urea emulsion into the reaction product, and mixing uniformly. The pigment printing adhesive has good low-temperature flexibility, hand feeling and attachment fastness. CN102030857a relates to a vinyl acetate-ethylene copolymer emulsion used as electrostatic flocking adhesive and its synthesis method. The emulsion polymerization is carried out by taking organic peroxide and zinc formaldehyde sulfoxylate as initiator, taking vinyl acetate, ethylene, acrylic ester monomer and cross-linking monomer N-methylol acrylamide as comonomer, adopting composite emulsion of nonionic emulsifier and amphoteric emulsifier, and protective colloid as emulsifying system. Compared with the VAE emulsion prepared by the conventional method, the VAE emulsion has the advantages of good water resistance, strong adhesion to low surface energy materials (polyethylene, polypropylene and the like), fine particles and the like, and the vinyl acetate-ethylene copolymer emulsion prepared by the method is suitable for being used as an adhesive to be applied to the fields of electro