CN109943120B - Wall cloth base film and preparation process thereof - Google Patents
Wall cloth base film and preparation process thereof Download PDFInfo
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- CN109943120B CN109943120B CN201910205336.4A CN201910205336A CN109943120B CN 109943120 B CN109943120 B CN 109943120B CN 201910205336 A CN201910205336 A CN 201910205336A CN 109943120 B CN109943120 B CN 109943120B
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Abstract
The invention relates to a wall cloth base film, which relates to the technical field of wall cloth auxiliary materials and comprises the following raw materials in parts by weight: 385 parts of first auxiliary agent 365-; the first auxiliary agent comprises, by weight, 10-20% of acrylic emulsion, 20-30% of polyurethane emulsion, 6-10% of butyl acrylate, 6-10% of glycidyl methacrylate, 1-5% of phosphorous acid-diisooctyl phenyl, 0.4-0.8% of sodium dodecyl benzene sulfonate, 0.4-0.8% of alkylphenol polyoxyethylene, 0.1-0.5% of sodium diethylenetriamine pentacarboxylic acid, 0.1-0.5% of ammonium persulfate, and the balance of deionized water. Through the compounding of the acrylic emulsion and the polyurethane emulsion and the addition of the thickening agent, the wall cloth base film is prevented from being solidified due to long-time placement, and the cohesiveness between the wall cloth base film and the wall surface can be improved.
Description
Technical Field
The invention relates to the technical field of wall cloth accessories, in particular to a wall cloth base film and a preparation process thereof.
Background
The wall cloth base film is a novel wall surface treatment material which is matched with wall cloth in use when the wall cloth is pasted. Before the wall cloth is pasted, a layer of wall cloth base film is coated on the wall surface, so that a layer of compact protective film can be formed on the wall surface, moisture and alkaline substances are prevented from being leaked, the service life of the wall cloth is effectively prolonged, and convenience is brought to later-stage replacement of the wall cloth. The application method of the wall cloth base film is simple: and (3) uniformly rolling and coating the base film on the wall surface by adopting a roller for rolling the coating, and pasting the wall cloth after the base film is dried.
At present, wall cloth basement membranes on the market are generally composed of polyurethane emulsion, but after the polyurethane emulsion is placed for a long time, the problems of solidification, condensation into paste and the like exist due to the reduction of water content and the crosslinking reaction of binding bands. After a long time of standing, it may be coagulated into a paste. Therefore, the wall cloth base film after being placed for a long time needs to be diluted by water to form a uniform and stable solution before being used. However, after the water is added for dilution, the solution density of the base film is reduced during coating, so that the wall cloth is not high in cohesiveness with the wall surface and is easy to separate from the wall surface.
Disclosure of Invention
The invention aims to provide a wall cloth base film and a preparation process thereof.
The above object of the present invention is achieved by the following technical solutions:
a wall cloth base film comprises the following raw materials in parts by weight: 385 parts of first auxiliary agent 365-;
the first auxiliary agent comprises, by weight, 10-20% of acrylic emulsion, 20-30% of polyurethane emulsion, 6-10% of butyl acrylate, 6-10% of glycidyl methacrylate, 1-5% of phosphorous acid-diisooctyl phenyl, 0.4-0.8% of sodium dodecyl benzene sulfonate, 0.4-0.8% of alkylphenol polyoxyethylene, 0.1-0.5% of sodium diethylenetriamine pentacarboxylic acid, 0.1-0.5% of ammonium persulfate, and the balance of deionized water.
By adopting the technical scheme, the film-forming additive comprises the following components: is a very soluble and very slowly volatile solvent. Film-forming aids, also known as coalescents and coalescents, swell and deform the polymer particles under pressure, thereby lowering the minimum film-forming temperature of emulsions and latex paints. The film-forming assistant is usually a solvent with a high boiling point, has a certain volatility, and slowly volatilizes after the film is formed. It softens the latex polymer particles, causing them to coalesce and fuse together, better forming a film. The film-forming assistant can reduce the lowest film-forming temperature of the emulsion paint, and can improve the weather resistance, the scrubbability, the color-developing property of a coating and other paint film performances of the emulsion paint. Meanwhile, the film forming additive is a volatile temporary plasticizer, can promote the plastic flow and elastic deformation of latex particles, improves the coalescence of the latex particles, and can form a film in a wide construction temperature range.
Ethylene glycol is used as a solvent for dissolving organic compounds. At the same time, the emulsifier can be used as a co-emulsifier to improve the surface tension among various constituent phases in the emulsion so as to form a uniform and stable dispersion system or a substance of the emulsion.
Wetting agents can make solid materials more susceptible to water. The solid material is wetted by reducing its surface tension or interfacial tension, allowing water to spread on or penetrate the surface of the solid material. Both of which are composed of a hydrophilic group and a lipophilic group, the lipophilic group adheres to the solid surface when in contact therewith, and the hydrophilic group extends outwardly into the liquid to cause the liquid to form a continuous phase on the solid surface.
The wetting agent is a wetting agent sold by Beijing Qifei science and technology development Co., Ltd and is of a type of PE-100.
Defoamers are food additives that reduce surface tension, inhibit foam generation, or eliminate foam already generated during food processing. By adding the defoaming agent, the generation of foam can be inhibited, thereby improving the stability of the system.
The defoaming agent is NXZ defoaming agent sold by Guangzhou Hengyu chemical company Limited.
The thickener is a food additive, and is mainly used for improving and increasing the viscosity of food, maintaining the stability of fluid food and jelly food, improving the physical properties of food, increasing the viscosity of food or forming gel, and having the functions of emulsifying, stabilizing or making food in a suspension state.
The acrylic emulsion is widely used for pigment printing, electrostatic flocking, fabric attaching, warp sizing, coating processing and the like. The emulsion has uniform particle size distribution, high stability, good comprehensive performance of the coating and good waterproof performance, and the waterproof performance can reach a higher level.
The polyurethane emulsion takes water as a solvent, and has the advantages of no pollution, safety, reliability, excellent mechanical property, good compatibility, easy modification and the like. The particle size of the polyurethane particles is far smaller than that of latex particles of conventional pure acrylic emulsion and silicone acrylic emulsion, the polyurethane particles with uniform particle size contain proper hydrophilic groups, and the polyurethane particles are gradually contacted and fused by a small amount of film-forming auxiliary agent and water swelling polyurethane particles along with the volatilization of water in the film-forming process to form a high-quality coating film. Meanwhile, the smaller particle size enables the free film forming energy of polyurethane to be lower, so that the film forming capability of the polyurethane aqueous dispersion is higher than that of the conventional pure acrylic emulsion and silicone acrylic emulsion. The film can be formed under the condition of lower temperature. After the polyurethane film is formed, because the carbamate groups in the molecular structure are easy to form intramolecular and intermolecular hydrogen bonds and crystals are formed due to the regularity of the molecular structure, more physical crosslinking points with stronger binding force exist in the molecules of the thermoplastic polyurethane. Therefore, the polyurethane coating has high mechanical strength and good water resistance. Unique physical cross-linked structure: can form T-shaped hydrogen bond structure and better crystallization capability, and ensures that the molecular structure of the coating film is very compact.
However, the polyurethane emulsion has problems of solidification and coagulation into paste due to reduction of moisture and crosslinking reaction of the binding band after being left for a long time.
Through the compounding of the acrylic emulsion and the polyurethane emulsion, the prepared wall cloth base film can make up for deficiencies of each other, has good comprehensive performance, has good water resistance, oil resistance, heat resistance, water resistance and alkali resistance, also has good aging resistance, reduces the curing of the wall cloth base film due to long-time placement, improves the service life of the wall cloth base film, and improves the cohesiveness between the wall cloth base film and the wall surface. Meanwhile, the acrylic emulsion is cheaper, so that the cost can be saved, and the cost expenditure can be reduced by compounding the acrylic emulsion and the acrylic emulsion.
Butyl acrylate, glycidyl methacrylate and phenyl diisooctyl phosphite are added to enhance the film forming property of acrylic emulsion and polyurethane emulsion, the drying rhythm is controlled to realize slow drying, and the components are promoted to fully permeate in the slow drying process, so that the aim of curing the wall is fulfilled.
Sodium dodecyl benzene sulfonate is an anionic emulsifier, and alkylphenol polyoxyethylene is a nonionic emulsifier, and is used for improving the surface tension among various phases in the emulsion so as to form a uniform and stable dispersion system or a substance of the emulsion.
The sodium diethylenetriamine pentacarboxylate is used as a metal chelating agent to increase the stability of the system. The ammonium persulfate is used as an initiator for initiating free radical polymerization and copolymerization of alkene and diene monomers, and can also be used for crosslinking curing and high-molecular crosslinking reaction of unsaturated polyester.
The invention is further configured to: the polyurethane emulsion comprises the following raw materials in percentage by weight: 10-20% of succinic acid polyester glycol, 20-30% of polytetrahydrofuran ether glycol, 10-15% of hexamethylene diisocyanate, 6-10% of trimethylolpropane polyethylene glycol monomethyl ether, 1-5% of triethylamine, 0.6-1% of polyoxyethylene, 0.1-0.5% of oxime-type end-capping agent and the balance of deionized water.
By adopting the technical scheme, the succinic acid polyester diol can be copolymerized with hexamethylene diisocyanate to generate polyester polyurethane, and the polyester polyurethane has the characteristics of high strength, good cohesive force and the like, but has poor water resistance. The polytetrahydrofuran ether diol and hexamethylene diisocyanate are copolymerized to generate polyether polyurethane, and the polyether polyurethane has the characteristics of good low-temperature flexibility, good water resistance and the like. Through the compounding of polyether polyurethane and polyester polyurethane, the prepared wall cloth base film can make up for the deficiencies of the polyether polyurethane and has better comprehensive performance.
The oxime blocking agent has high reaction activity to hexamethylene diisocyanate, so that when the oxime blocking agent is used as the blocking agent, no catalyst is needed to be added, the blocking temperature is low, and the polyurethane emulsion can be effectively prevented from being subjected to a crosslinking reaction due to long-time placement.
The triethylamine can be used as a balanced tertiary amine catalyst of polyurethane, has the function of forming a skin and improves the film forming property of the polyurethane. Meanwhile, the polyurethane can be used as a neutralization salt forming agent of an anionic polyurethane system.
Trimethylolpropane polyethylene glycol monomethyl ether is used as a non-ionic chain extender, and repeated-CH 2CH 20-is introduced into polyurethane macromolecules as a side chain, so that the dispersibility of the polyurethane macromolecules is improved.
Polyethylene oxide is used as an emulsifier to improve the surface tension between the various constituent phases in the emulsion, resulting in a uniform and stable dispersion or emulsion.
The invention is further configured to: the polyurethane emulsion also comprises the following raw materials in percentage by weight: 6-10% of tris (2-chloropropyl) phosphate.
By adopting the technical scheme, the phosphate can be used as a flame-retardant plasticizer to improve the flame-retardant effect of the wall cloth. And phosphorus and halogen coexist in the flame-retardant system, and can generate a synergistic effect, so that the flame-retardant effect of the wall cloth is improved. Meanwhile, the tris (2-chloropropyl) phosphate can be subjected to graft copolymerization with polyurethane macromolecules, and a phosphate short branched chain is introduced into the polyurethane macromolecules to improve the hydrophilicity of the polyurethane macromolecules, so that polyurethane particles are gradually contacted and fused by a small amount of film-forming auxiliary agent and water swelling along with the volatilization of water in the film-forming process to form a high-quality coating.
The tris (2-chloropropyl) phosphate can also introduce chloride ions into polyurethane macromolecules to generate quaternary ammonium salt, so that the generated product has certain antibacterial property.
The invention is further configured to: the acrylic emulsion comprises the following raw materials in percentage by weight: 30-40% of butyl acrylate, 0.1-0.5% of silane coupling agent, 0.1-0.5% of itaconic anhydride, 10-20% of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, 0.1-0.5% of sodium dodecyl benzene sulfonate, 0.1-0.5% of alkylphenol polyoxyethylene, 0.01-0.05% of sodium bicarbonate, 0.6-1% of N-hydroxymethyl acrylic acid, 0.01-0.05% of ammonium persulfate and the balance of deionized water.
By adopting the technical scheme, butyl acrylate can generate self-polymerization under the action of ammonium persulfate to generate polyacrylic acid. Polyacrylic acid generates pure acrylic emulsion under the action of sodium dodecyl benzene sulfonate and alkylphenol polyoxyethylene. The pure acrylic emulsion has fine grain diameter and high luster. And the aging resistance, the weather resistance and the anti-tack property are excellent, and the applicability is wide.
N-beta- (aminoethyl) -gamma-aminopropyl trimethoxy silane and pure acrylic emulsion can be subjected to graft copolymerization under the action of ammonium persulfate and a silane coupling agent, so that a certain amount of branched Si-O-Si side groups are introduced into a macromolecular chain of a polymer. Because the Si-O-Si group and the acrylate chain segment have larger polarity difference and have stronger microphase separation tendency, when the polymer film is formed, the large-volume hydrophobic group can migrate to be enriched on the surface of the film to form a comb-shaped structure, thereby obviously reducing the surface energy of the polymer film and improving the water resistance of the polymer film. Meanwhile, because Si-O-Si only exists in side chain groups and the chain is short, although the intermolecular force of the polymer is reduced, the degree is limited, the particle size of the polymer emulsion can be reduced, and the aggregation among emulsion particles is tighter when the emulsion is formed into a film, thereby improving the mechanical property of the emulsion.
The invention is further configured to: the acrylic emulsion comprises the following raw materials in percentage by weight: 0.1 to 0.5 percent of chitosan.
By adopting the technical scheme, the chitosan has better antibacterial activity and can inhibit the growth and the propagation of fungi, bacteria and viruses. Meanwhile, chitosan is also used as a thickening agent and a coating agent and listed in the national food additive use standard GB-2760.
The N-beta- (aminoethyl) -gamma-aminopropyl trimethoxy silane may be copolymerized under the action of initiator and silane coupler to produce silicone oil. The silicone oil and the chitosan can generate graft copolymerization under the action of an initiator and a silane coupling agent, so that the chitosan is grafted on the amino silicone oil, and the wall cloth basement membrane has an antibacterial effect.
The invention is further configured to: the thickening agent comprises the following raw materials in percentage by weight: the thickening agent comprises the following raw materials in percentage by weight: 28-32% of polyurethane thickener, 21-25% of acrylic thickener and 41-45% of hydrophobic modified alkali soluble thickener.
By adopting the technical scheme, the polyurethane thickener forms a reversible association network through the specific hydrophilic and hydrophobic chain segments to achieve a good thickening effect. The thickening effect is obvious, the anti-mildew performance is excellent, the pH change is stable, and the structure is more organized than the connection effect of cellulose due to the formation of a reversible association network. But are sensitive to the components of the micelles in the product formulation, and the components of the micelles can influence the thickening effect of the polyurethane thickener, so that the application range of the polyurethane thickener is small.
The acrylic acid thickener enables molecular chains to be stretched under the action of ions on the molecular chains, forms a net structure, presents expansibility but not dissolubility, and achieves the thickening purpose. Has stronger thickening property, better rheological property and good biological stability, but the thickening agent is sensitive to pH value, contains anions in molecular chains and has poor water resistance and alkali resistance.
The hydrophobic modified alkali soluble thickener is a hydrophobic thickener suitable for a water-based paint system, can improve the thixotropy of the paint, improve the viscosity of a product under low shear, and can effectively improve the fluidity and the leveling property of the paint.
The application range and the chemical stability of the product are improved by using the three thickening agents in combination.
The polyurethane thickener is polyurethane thickener rm-8w produced by Shanghai Pioyou chemical company, the acrylic acid thickener is acrylic acid thickener with ase-60 produced by Shanghai Kaiyn chemical company, and the hydrophobic modified alkali-soluble thickener is hydrophobic modified alkali-swelling thickener with DAD THICKENER 732d produced by Jinan Haichi chemical company.
The invention is further configured to: the film forming aid comprises one or more of dodecyl alcohol ester, ethylene glycol butyl ether and hexanediol butyl ether acetate.
By adopting the technical scheme, the dodecyl alcohol ester is an alcohol ester compound with the chemical name of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, and can be used for facilitating the film formation of various commercial emulsions and effectively reducing the minimum film formation temperature.
Ethylene glycol butyl ether can be used as cellulose nitrate; painting; quick-drying paint; varnish; enamel and paint remover. Can also be used as fiber wetting agent; a pesticide dispersant; a resin plasticizer; and (4) organically synthesizing an intermediate. An auxiliary solvent that improves the emulsifying properties and dissolves the mineral oil in the soap solution.
The hexanediol butyl ether acetate is a high boiling point, polyfunctional glycol ether ester solvent, can be used as coalescence assistant agent for latex paint, and has excellent solubility to various paints, so that it can be widely used in colorful paint and emulsion paint.
The preparation process of the wall cloth base film is characterized by comprising the following steps:
1) preparing a thickening agent solution;
2) preparing a polyurethane emulsion: proportionally mixing succinic acid polyester diol, polytetrahydrofuran diol and hexamethylene diisocyanate for reaction, adding tri (2-chloropropyl) phosphate and trimethylolpropane polyethylene glycol monomethyl ether for mixing reaction, and then adding triethylamine, polyoxyethylene, oxime end-capping agents and deionized water for full reaction to obtain polyurethane emulsion;
3) preparing acrylic emulsion: mixing and stirring butyl acrylate, N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, a silane coupling agent, itaconic anhydride, sodium dodecyl benzene sulfonate, alkylphenol ethoxylates, sodium bicarbonate, N-hydroxymethyl acrylic acid, ammonium persulfate, chitosan and deionized water according to a proportion, and carrying out heat preservation reaction at 86-90 ℃ to obtain a first mixed solution;
heating the first mixed solution to 90-95 ℃, and carrying out heat preservation reaction at 90-95 ℃ to obtain acrylic emulsion;
4) preparing a first auxiliary agent: mixing and stirring acrylic emulsion, polyurethane emulsion, butyl acrylate, glycidyl methacrylate, diisooctyl phosphite, sodium dodecyl benzene sulfonate, alkylphenol polyoxyethylene, sodium diethylenetriamine pentacarboxylic acid, ammonium persulfate and deionized water according to a certain proportion to prepare a first auxiliary agent;
5) and mixing and stirring the first auxiliary agent, the film forming auxiliary agent, the glycol, the wetting agent, the defoaming agent, the thickening agent and the deionized water according to the proportion to prepare the wall cloth base film.
By adopting the technical scheme, in the second step, firstly succinic acid polyester diol, polytetrahydrofuran diol and hexamethylene diisocyanate are added to generate polyurethane macromolecules, then tris (2-chloropropyl) phosphate and trimethylolpropane polyethylene glycol monomethyl ether are added to introduce hydrophilic groups and quaternary ammonium salts, and finally triethylamine, polyethylene oxide and oxime type end capping agents are added to adjust the pH value of the solution to form uniform emulsion and to cap the polyurethane macromolecules so as to control the relative molecular number of the polyurethane macromolecules and prevent the polyurethane macromolecules from being crosslinked.
In the third step, the pure acrylic emulsion and the silicone acrylic emulsion are prepared by the heat preservation reaction at the temperature of 86-90 ℃, and then the heat preservation reaction is carried out at the temperature of 90-95 ℃, so that the N-beta- (aminoethyl) -gamma-aminopropyl trimethoxy silane, the silane coupling agent and the chitosan are subjected to graft copolymerization, and the chitosan is grafted on the silicone oil, so that the wall cloth basement membrane has the antibacterial effect.
And step four, compounding the acrylic emulsion and the polyurethane emulsion to prepare the first auxiliary agent.
And step five, preparing the wall cloth base film.
The invention is further configured to: the concrete operation steps for preparing the thickening agent solution in the step 1 are as follows:
1) mixing a polyurethane thickener with deionized water according to the weight ratio of 1:1 to prepare a polyurethane thickener solution;
2) mixing an acrylic acid thickening agent with deionized water according to the weight ratio of 1:1 to prepare an acrylic acid thickening agent solution;
3) mixing the hydrophobic modified alkali soluble thickener with deionized water according to the weight ratio of 1:2 to prepare a hydrophobic modified alkali soluble thickener solution;
4) mixing the polyurethane thickener solution, the acrylic acid thickener solution and the hydrophobically modified alkali soluble thickener solution to prepare the thickener solution
By adopting the technical scheme, the thickening agent is used for diluting the polyurethane thickening agent, the acrylic acid thickening agent and the hydrophobic modified alkali soluble thickening agent, and the thickening agent is prevented from being directly added into a mixture to react, so that the viscosity of a product is influenced, the viscosity of the product is caused to be overhigh, and the film forming property of a wall cloth base film is influenced.
In conclusion, the beneficial technical effects of the invention are as follows:
1. by compounding the acrylic emulsion and the polyurethane emulsion and adding the thickening agent, the wall cloth base film is prevented from being solidified due to long-time placement, and the cohesiveness between the wall cloth base film and the wall surface can be improved;
2. the wall cloth basement membrane has an antibacterial effect by adding tris (2-chloropropyl) phosphate and chitosan, introducing chloride ions into polyurethane macromolecules to generate quaternary ammonium salt and grafting the chitosan on silicone oil.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Referring to fig. 1, a preparation process of a wall cloth base film includes the following steps:
1) preparing a thickening agent solution;
mixing 30% of polyurethane thickener rm-8w with deionized water according to the weight ratio of 1:1 to prepare a polyurethane thickener solution;
mixing 23% of acrylic acid thickener ase-60 with deionized water according to the weight ratio of 1:1 to prepare acrylic acid thickener solution;
mixing DAD THICKENER 732 hydrophobic modified alkali soluble thickener 43% with deionized water according to the weight ratio of 1:2 to prepare a hydrophobic modified alkali soluble thickener solution;
mixing the polyurethane thickener solution, the acrylic acid thickener solution and the hydrophobically modified alkali soluble thickener solution to prepare a thickener solution;
2) preparing a polyurethane emulsion: mixing 15% of succinic acid polyester diol, 25% of polytetrahydrofuran diol and 12.5% of hexamethylene diisocyanate for reaction, then adding 8% of tris (2-chloropropyl) phosphate and 8% of trimethylolpropane polyethylene glycol monomethyl ether for mixing reaction, and then adding 3% of triethylamine, 0.8% of polyoxyethylene, 0.3% of oxime end-capping agent and 27.4% of deionized water for full reaction to obtain polyurethane emulsion;
3) preparing acrylic emulsion: mixing 35% of butyl acrylate, 15% of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, 0.3% of silane coupling agent, 0.3% of itaconic anhydride, 0.3% of sodium dodecyl benzene sulfonate, 0.3% of alkylphenol polyoxyethylene, 0.03% of sodium bicarbonate, 0.8% of N-hydroxymethyl acryloyl, 0.03% of ammonium persulfate, 0.3% of chitosan and 47.64% of deionized water, stirring, and carrying out heat preservation reaction at 88 ℃ to obtain a first mixed solution;
heating the first mixed solution to 92 ℃, and carrying out heat preservation reaction at 92 ℃ to obtain acrylic emulsion;
4) preparing a first auxiliary agent: mixing and stirring 15% of acrylic emulsion, 25% of polyurethane emulsion, 8% of butyl acrylate, 8% of glycidyl methacrylate, 3% of phenyl diisooctyl phosphite, 0.6% of sodium dodecyl benzene sulfonate, 0.6% of alkylphenol polyoxyethylene, 0.3% of sodium diethylenetriamine pentacarboxylate, 0.3% of ammonium persulfate and 39.2% of deionized water to prepare a first auxiliary agent;
5) 375 parts of first auxiliary agent, 18 parts of dodecyl alcohol ester, 18 parts of ethylene glycol, 3 parts of PE-100 wetting agent, 3 parts of NXZ defoaming agent, 25 parts of thickening agent and 555 parts of deionized water are mixed and stirred according to the proportion to prepare the wall cloth base film.
The oxime blocking agent is dimethyl ketoxime, and the silane coupling agent is a silane coupling agent sold by Nanjing warp-weft chemical company Limited and with the model number of KH-560.
Examples 2-5 differ from example 1 in that: the wall cloth base film comprises the following raw materials in parts by weight:
examples 6-9 differ from example 1 in that: the first auxiliary agent comprises the following raw materials in percentage by weight:
examples 10-13 differ from example 1 in that: the polyurethane emulsion comprises the following raw materials in percentage by weight:
examples 14-17 differ from example 1 in that: the acrylic emulsion comprises the following raw materials in percentage by weight:
examples 18-21 differ from example 1 in that: the thickening agent comprises the following raw materials in percentage by weight:
examples 22-26 differ from example 1 in that: the film-forming assistant comprises the following raw materials in percentage by weight:
examples 27-30 differ from example 1 in that: the initial incubation reaction temperature in step three is as follows:
| examples | Example 27 | Example 28 | Example 29 | Example 30 |
| Temperature/. degree.C | 86 | 87 | 89 | 90 |
Examples 31-34 differ from example 1 in that: the reaction temperature after temperature rise in the third step is as follows:
| examples | Example 31 | Example 32 | Example 33 | Example 34 |
| Temperature/. degree.C | 90 | 91 | 94 | 95 |
Comparative example
Comparative example 1 differs from example 1 in that: acrylic-free emulsion.
Comparative example 2 differs from example 1 in that: no polyurethane emulsion.
Comparative example 3 differs from example 1 in that: no thickening agent.
Comparative example 4 a wall cloth base film commonly used in the market, such as a marine Daji penetration type base film produced by Shanghai Danming practice Co., Ltd, was used.
The base wall cloth films obtained in example 1 and comparative examples 1 to 4 were tested as follows:
dividing 5 kinds of wall cloth base films produced according to the requirements into five groups of a, b, c, d and e, respectively placing the five groups of wall cloth base films for 1 year, 2 years and 3 years, and respectively taking the same amount of wall cloth base films at different placing time to divide the wall cloth base films into a0, a1, a2 and a 3; b0, b1, b2, b 3; c0, c1, c2, c 3; d0, d1, d2, d 3; e0, e1, e2, e 3; deionized water with equal mass is added into each group, after the deionized water is uniformly stirred, the wall cloth base film in each group is coated with wallpaper and then is bonded to a tinned flat copper wire sample to be cut into sample strips with the width of 10mm, the 90-degree peel strength is tested on a peel strength resistance testing machine, and the 90-degree peel strength of the same sample is tested again after the sample is placed for one week.
The wall cloth base film has excellent bonding performance, and the acrylic emulsion and the polyurethane emulsion are compounded and the thickening agent is added, so that the curing of the wall cloth base film due to long-time placement can be reduced to a certain extent, the service life of the wall cloth base film is prolonged, the adhesion between the wall cloth base film and a wall surface is improved, and the property of the wall cloth base film after being placed for about three years is not greatly different from that of the wall cloth base film when being made.
Comparative example 5 differs from example 1 in that: chitosan was not added to the acrylic emulsion.
Comparative example 6 differs from example 1 in that: tris (2-chloropropyl) phosphate was not added to the polyurethane emulsion.
Comparative example 7 differs from example 1 in that: chitosan is not added into the acrylic emulsion, and tris (2-chloropropyl) phosphate is not added into the polyurethane emulsion.
The backsizes obtained in the above examples 1-3, 24, and comparative examples 4-8 were tested as follows:
antibacterial performance test, AATCC-90 test method: test bacteria are inoculated on an agar culture medium, the test bacteria are tightly attached to a sample, the culture is carried out for 24 hours at 37 ℃, and then the propagation condition of the bacteria and the size of a halo in a sterile area around the sample are observed by a magnifying glass. The width of the stop band is increased from 1 level to 10 levels in sequence. The width of the stop band represents the magnitude of the antimicrobial efficacy.
Flame retardant property: the measurement was carried out by using a horizontal-vertical burning test machine in accordance with UL94 standard.
| Detecting items | Width of stop belt | Flame retardant rating |
| Example 1 | Grade 6 | V0 |
| Example 2 | Grade 5.5 | V0 |
| Example 3 | Grade 5.8 | V0 |
| Example 24 | Grade 6.5 | V0 |
| Comparative example 4 | Stage 2 | V1 |
| Comparative example 5 | Grade 3 | V1 |
| Comparative example 6 | Grade 3 | V2 |
| Comparative example 7 | Level 1 | HB |
From the above table, it can be seen that the antibacterial and bacteriostatic ability of the wall cloth basement membrane can be improved by adding chitosan into the acrylic emulsion and adding tris (2-chloropropyl) phosphate into the polyurethane emulsion, and the antibacterial and bacteriostatic ability is enhanced with the increase of the added amount.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A wall cloth base film which characterized in that: the feed comprises the following raw materials in parts by weight: 385 parts of first auxiliary agent 365-;
the first auxiliary agent comprises the following raw materials, by weight, 10-20% of acrylic emulsion, 20-30% of polyurethane emulsion, 6-10% of butyl acrylate, 6-10% of glycidyl methacrylate, 1-5% of phosphorous acid-diisooctyl phenyl, 0.4-0.8% of sodium dodecyl benzene sulfonate, 0.4-0.8% of alkylphenol polyoxyethylene, 0.1-0.5% of sodium diethylenetriamine pentacarboxylic acid, 0.1-0.5% of ammonium persulfate and the balance of deionized water;
the polyurethane emulsion comprises the following raw materials in percentage by weight: 10-20% of succinic acid polyester glycol, 20-30% of polytetrahydrofuran glycol, 10-15% of hexamethylene diisocyanate, 6-10% of trimethylolpropane polyethylene glycol monomethyl ether, 1-5% of triethylamine, 0.6-1% of polyoxyethylene, 0.1-0.5% of oxime end-capping agent, 6-10% of tris (2-chloropropyl) phosphate and the balance of deionized water.
2. A wall cloth base film as claimed in claim 1, wherein: the acrylic emulsion comprises the following raw materials in percentage by weight: 30-40% of butyl acrylate, 0.1-0.5% of silane coupling agent, 0.1-0.5% of itaconic anhydride, 10-20% of N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, 0.1-0.5% of sodium dodecyl benzene sulfonate, 0.1-0.5% of alkylphenol polyoxyethylene, 0.01-0.05% of sodium bicarbonate, 0.6-1% of N-hydroxymethyl acrylic acid, 0.01-0.05% of ammonium persulfate and the balance of deionized water.
3. A wall cloth base film as claimed in claim 2, wherein: the acrylic emulsion comprises the following raw materials in percentage by weight: 0.1 to 0.5 percent of chitosan.
4. A wall cloth base film as claimed in claim 1, wherein: the thickening agent comprises the following raw materials in percentage by weight: 28-32% of polyurethane thickener, 21-25% of acrylic thickener and 41-45% of hydrophobic modified alkali soluble thickener.
5. A wall cloth base film as claimed in claim 1, wherein: the film forming aid comprises one or more of dodecyl alcohol ester, ethylene glycol butyl ether and hexanediol butyl ether acetate.
6. The preparation process of the wall cloth base film is characterized by comprising the following steps:
1) preparing a thickening agent solution;
2) preparing a polyurethane emulsion: proportionally mixing succinic acid polyester diol, polytetrahydrofuran diol and hexamethylene diisocyanate for reaction, adding tri (2-chloropropyl) phosphate and trimethylolpropane polyethylene glycol monomethyl ether for mixing reaction, and then adding triethylamine, polyoxyethylene, oxime end-capping agents and deionized water for full reaction to obtain polyurethane emulsion;
3) preparing acrylic emulsion: mixing and stirring butyl acrylate, N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, a silane coupling agent, itaconic anhydride, sodium dodecyl benzene sulfonate, alkylphenol ethoxylates, sodium bicarbonate, N-hydroxymethyl acrylic acid, ammonium persulfate, chitosan and deionized water according to a proportion, and carrying out heat preservation reaction at 86-90 ℃ to obtain a first mixed solution;
heating the first mixed solution to 90-95 ℃, and carrying out heat preservation reaction at 90-95 ℃ to obtain acrylic emulsion;
4) preparing a first auxiliary agent: mixing and stirring acrylic emulsion, polyurethane emulsion, butyl acrylate, glycidyl methacrylate, diisooctyl phosphite, sodium dodecyl benzene sulfonate, alkylphenol polyoxyethylene, sodium diethylenetriamine pentacarboxylic acid, ammonium persulfate and deionized water according to a certain proportion to prepare a first auxiliary agent;
5) and mixing and stirring the first auxiliary agent, the film forming auxiliary agent, the glycol, the wetting agent, the defoaming agent, the thickening agent and the deionized water according to the proportion to prepare the wall cloth base film.
7. The process for preparing a wallpaper-based film as claimed in claim 6, wherein: the concrete operation steps for preparing the thickening agent solution in the step 1 are as follows:
1) mixing a polyurethane thickener with deionized water according to the weight ratio of 1:1 to prepare a polyurethane thickener solution;
2) mixing an acrylic acid thickening agent with deionized water according to the weight ratio of 1:1 to prepare an acrylic acid thickening agent solution;
3) mixing the hydrophobic modified alkali soluble thickener with deionized water according to the weight ratio of 1:2 to prepare a hydrophobic modified alkali soluble thickener solution;
4) and mixing the polyurethane thickener solution, the acrylic acid thickener solution and the hydrophobically modified alkali soluble thickener solution to prepare the thickener solution.
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| CN111004560A (en) * | 2019-12-24 | 2020-04-14 | 青海民族大学 | Coating for protecting ancient buildings |
| CN116656203B (en) * | 2023-08-02 | 2023-10-27 | 江西永通科技股份有限公司 | Coating composition with mildew-proof and antibacterial properties and preparation method thereof |
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| CN102775895A (en) * | 2012-07-06 | 2012-11-14 | 苏州萃智新技术开发有限公司 | Flame-retardant polyurethane paint |
| CN104804165A (en) * | 2015-04-30 | 2015-07-29 | 福建宝利特集团有限公司 | Waterborne polyurethane emulsion, preparation method for waterborne polyurethane emulsion, application of waterborne polyurethane emulsion to wallpaper basement membrane and wallpaper basement membrane |
| CN106349834A (en) * | 2016-08-26 | 2017-01-25 | 桐乡嘉力丰实业股份有限公司 | Alkali-resistant mildew-proof type wallpaper base film and preparation technology thereof |
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