阅读说明：本技术 一种耐水高粘性生物质墙纸胶的制备方法 (Preparation method of water-resistant high-viscosity biomass wallpaper adhesive ) 是由 李文凤 于 2019-10-21 设计创作，主要内容包括：本发明属于装饰技术领域,具体涉及一种耐水高粘性生物质墙纸胶的制备方法。本发明首先以淀粉作为生物质材料,将其和丙烯酰胺接枝改性,再以三羟甲基苯酚和异氰酸酯为交联剂,合成淀粉基胶,提高了墙纸胶的粘结强度,此外本发明还加入了聚乙烯醇和3,4-二羟基苯甲酸混合反应后的反应液以及多孔硅酸二钙和氧化酶,其中聚乙烯醇溶液和3,4-二羟基苯甲酸溶液先进行酯化反应,从而引入邻苯二酚功能基团,提高了墙纸胶的粘结强度,同时生成的这层网状聚合物交联结构疏水性好,再结合加入的多孔硅酸二钙具有水化性能,提高了墙纸胶的耐水性。(The invention belongs to the technical field of decoration, and particularly relates to a preparation method of a water-resistant high-viscosity biomass wallpaper adhesive. The invention firstly takes starch as a biomass material, the starch and acrylamide are grafted and modified, then trihydroxymethyl phenol and isocyanate are taken as cross-linking agents to synthesize starch-based glue, so that the bonding strength of the wallpaper glue is improved, in addition, reaction liquid obtained after the mixed reaction of polyvinyl alcohol and 3, 4-dihydroxy benzoic acid, porous dicalcium silicate and oxidase are added, wherein the polyvinyl alcohol solution and the 3, 4-dihydroxy benzoic acid solution are subjected to esterification reaction firstly, so that catechol functional groups are introduced, the bonding strength of the wallpaper glue is improved, meanwhile, the generated layer of reticular polymer has good cross-linking structure hydrophobicity, and the added porous dicalcium silicate has hydration performance, so that the water resistance of the wallpaper glue is improved.)

1. A preparation method of a water-resistant high-viscosity biomass wallpaper adhesive is characterized by comprising the following specific preparation steps:

weighing starch-based glue, reaction liquid, porous dicalcium silicate powder and catechol oxidase in parts by weight, mixing, putting into a colloid mill, grinding and reacting for 15-20 min, and discharging to obtain the water-resistant high-viscosity biomass wallpaper glue;

the preparation steps of the starch-based adhesive are as follows:

(1) mixing starch, acrylamide and water, then putting the mixture into a four-neck flask, adding ammonium ceric nitrate into the four-neck flask, putting the four-neck flask into a water bath kettle, heating to 70-80 ℃, stirring for reaction for 2-3 hours, and filtering and separating to obtain filter residues;

(2) putting the obtained filter residue into a beaker, adding trihydroxymethyl phenol, closed isocyanate and deionized water into the beaker, moving the beaker into a water bath kettle, heating to 60-70 ℃, and stirring for reacting for 40-60 min to obtain starch-based adhesive;

the preparation steps of the reaction solution are as follows:

mixing 25 mass percent of polyvinyl alcohol solution and 30 mass percent of 3, 4-dihydroxybenzoic acid solution, putting the mixture into a reaction kettle, heating to 70-80 ℃, and stirring for reaction for 3-5 hours to obtain reaction liquid;

the preparation steps of the porous dicalcium silicate powder are as follows:

(1) according to CaO/SiO₂Weighing calcium nitrate tetrahydrate and silica sol in a molar ratio of 2:1, mixing and stirring for 1-2 hours to obtain a mixed solution, and performing spray drying on the mixed solution at a spray drying rate of 1000mL/h to obtain spray-dried powder;

(2) placing the obtained spray-dried powder into a sintering furnace, pre-sintering at 700-800 ℃ for 10-15 min, mixing the pre-sintered substance, methylcellulose and calcium phosphate, and performing ball milling treatment for 2-3 h to obtain ball-milled powder;

(3) mixing the ball-milling powder and deionized water, stirring and mixing for 10-15 min, bagging, ageing for 24-30 h, transferring into a microwave sintering furnace, carrying out heat preservation and sintering, and then carrying out quenching and cooling to room temperature to obtain the porous dicalcium silicate powder.

2. The preparation method of the water-resistant high-viscosity biomass wallpaper adhesive as claimed in claim 1, characterized in that: in the specific preparation steps of the water-resistant high-viscosity biomass wallpaper adhesive, by weight, 60-70 parts of starch-based adhesive, 20-30 parts of reaction liquid, 3-5 parts of porous dicalcium silicate powder and 1-2 parts of catechol oxidase are used.

3. The preparation method of the water-resistant high-viscosity biomass wallpaper adhesive as claimed in claim 1, characterized in that: in the preparation step (1) of the starch-based adhesive, the mass ratio of starch to acrylamide to water is 2:1:5, and the addition amount of ammonium ceric nitrate is 3-5% of the mass of starch.

4. The preparation method of the water-resistant high-viscosity biomass wallpaper adhesive as claimed in claim 1, characterized in that: in the step (2) of preparing the starch-based adhesive, the adding amount of the trihydroxymethyl phenol is 3-5% of the mass of the filter residue, the adding amount of the closed isocyanate is 1-3% of the mass of the filter residue, and the adding amount of the deionized water is 2-3 times of the mass of the filter residue.

5. The preparation method of the water-resistant high-viscosity biomass wallpaper adhesive as claimed in claim 1, characterized in that: in the preparation step of the reaction solution, the mass ratio of the polyvinyl alcohol solution with the mass fraction of 25% to the 3, 4-dihydroxybenzoic acid solution with the mass fraction of 30% is 2: 1.

6. The preparation method of the water-resistant high-viscosity biomass wallpaper adhesive as claimed in claim 1, characterized in that: in the step (2) of preparing the porous dicalcium silicate powder, the mass ratio of the calcined substance to the methylcellulose and the calcium phosphate is 90:3: 1.

7. The preparation method of the water-resistant high-viscosity biomass wallpaper adhesive as claimed in claim 1, characterized in that: in the step (3) of preparing the porous dicalcium silicate powder, the mass ratio of the ball-milling powder to the deionized water is 8:1, the temperature for heat preservation sintering is 1200-1400 ℃, and the time for heat preservation sintering is 30-40 min.

Technical Field

The invention belongs to the technical field of decoration, and particularly relates to a preparation method of a water-resistant high-viscosity biomass wallpaper adhesive.

Background

Wallpaper is also called as wallpaper, is an interior decoration material for pasting wall surfaces, and is widely used for interior decoration of houses, offices, hotels, and the like. The material is not limited to paper, and may include other materials. The decorative material has the characteristics of various colors, rich patterns, luxury, safety, environmental protection, convenient construction, proper price and the like which are incomparable with various other interior decorative materials, so the decorative material is popularized to a great extent in developed countries and regions such as Europe, America, Japan and the like. Wallpaper is classified into various types, such as film-coated wallpaper, embossed wallpaper, and the like. The base paper is usually produced from bleached chemical wood pulp, and then is processed through different procedures, such as coating, printing, embossing or surface plastic coating, and finally is cut and packaged for delivery.

The wall paper needs to be pasted and wall paper adhesive is used, the performance of the wall paper adhesive can influence the pasting effect of the wall paper, and in addition, because the wall paper is mainly used for interior decoration of buildings, the most basic functions such as the pasting property and the service life of the wall paper are guaranteed, and meanwhile, the product is also required to be environment-friendly and harmless. The adhesion cannot be pursued or is pursued to be neglected. Otherwise it may be a health hazard to the user.

The wallpaper needs to be pasted on a wall by glue in the decoration process, the pasting effect of the wallpaper is the embodiment of the whole decoration effect, and the wallpaper is pasted for a long time and has the basic function of the wallpaper glue. The adhesives on the market at present are water-based adhesives and powder adhesives, the water-based adhesives are divided into water-soluble adhesives and emulsion adhesives, but the water-based adhesives contain toxic components, the powder adhesives are nontoxic and easy to mildew, the service time is short, and the service value is obviously reduced. From the main composition, the existing wallpaper glue is mainly a grain system which takes starch, potato powder and glutinous rice powder as raw materials, the grain system wallpaper glue has good adhesive force and no formaldehyde, but the starch, the potato powder and the glutinous rice powder are substances containing protein nutrient components, and once the wallpaper glue is wetted by water, the wallpaper glue is easy to grow mildews, has high decomposition speed and becomes a culture medium of the mildews, so that the glue made of the food base material is used for pasting wallpaper, and once the wallpaper is wetted by air, the wallpaper can turn yellow, turn black, bulge and stick up edges, even can be perforated due to decomposition.

In the field of interior decoration, the existing wallpaper adhesive comprises urea-formaldehyde adhesive, PVA adhesive, polyacrylic acid adhesive, polyvinyl acetate adhesive and the like, and the wallpaper adhesive is a liquid formula and is inconvenient to transport, store and use; in addition, the wallpaper adhesive can generate harmful gas and pollutants in the using process, so that the indoor environment can be polluted, the human health is threatened, and the generated pollutants can not be degraded, so that the environmental pollution is caused.

Most of the glue used in the decoration industry is environment-friendly glue containing free formaldehyde, although the glue has low price and good bonding performance; formaldehyde is a colorless, highly irritating gas that has been identified by the world health organization as a carcinogenic and teratogenic substance and has been listed as a glue deterrent. Needless to say, formaldehyde has a toxic effect on human beings, and particularly if formaldehyde is used in the glue, the formaldehyde is released slowly after the glue is used indoors, the existence of free formaldehyde can be detected even in an indoor environment for years, the harm to people is irreversible, and a plurality of diseases of human beings are related to the existence of formaldehyde indoors clearly.

Therefore, it is necessary to develop a biomass wallpaper adhesive with good water resistance and high bonding strength for the technical field of decoration.

Disclosure of Invention

The invention mainly solves the technical problems that the conventional biomass-based wallpaper adhesive is poor in water resistance and low in bonding strength, colloid and wallpaper are easy to deteriorate and pulverize after being oxidized in a humid environment for a long time, so that the bonding effect is lost, and organic matter components contained in part of starch-based adhesives are oxidized and deteriorate after water absorption and denaturation, so that the preparation method of the water-resistant high-viscosity biomass wallpaper adhesive is provided.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a preparation method of the water-resistant high-viscosity biomass wallpaper adhesive comprises the following steps:

weighing starch-based glue, reaction liquid, porous dicalcium silicate powder and catechol oxidase in parts by weight, mixing, putting into a colloid mill, grinding and reacting for 15-20 min, and discharging to obtain the water-resistant high-viscosity biomass wallpaper glue;

preparing starch-based glue:

(1) mixing starch, acrylamide and water, then putting the mixture into a four-neck flask, adding ammonium ceric nitrate into the four-neck flask, putting the four-neck flask into a water bath kettle, heating to 70-80 ℃, stirring for reaction for 2-3 hours, and filtering and separating to obtain filter residues;

(2) putting the obtained filter residue into a beaker, adding trihydroxymethyl phenol, closed isocyanate and deionized water into the beaker, moving the beaker into a water bath kettle, heating to 60-70 ℃, and stirring for reacting for 40-60 min to obtain starch-based adhesive;

preparation of reaction solution:

mixing 25 mass percent of polyvinyl alcohol solution and 30 mass percent of 3, 4-dihydroxybenzoic acid solution, putting the mixture into a reaction kettle, heating to 70-80 ℃, and stirring for reaction for 3-5 hours to obtain reaction liquid;

preparation of porous dicalcium silicate powder:

(1) according to CaO/SiO₂Weighing calcium nitrate tetrahydrate and silica sol in a molar ratio of 2:1, mixing and stirring for 1-2 hours to obtain a mixed solution, and performing spray drying on the mixed solution at a spray drying rate of 1000mL/h to obtain spray-dried powder;

(2) placing the obtained spray-dried powder into a sintering furnace, pre-sintering at 700-800 ℃ for 10-15 min, mixing the pre-sintered substance, methylcellulose and calcium phosphate, and performing ball milling treatment for 2-3 h to obtain ball-milled powder;

(3) mixing the ball-milling powder and deionized water, stirring and mixing for 10-15 min, bagging, ageing for 24-30 h, transferring into a microwave sintering furnace, carrying out heat preservation and sintering, and then carrying out quenching and cooling to room temperature to obtain the porous dicalcium silicate powder.

In the preparation of the water-resistant high-viscosity biomass wallpaper adhesive, by weight, 60-70 parts of starch-based adhesive, 20-30 parts of reaction liquid, 3-5 parts of porous dicalcium silicate powder and 1-2 parts of catechol oxidase are used.

In the preparation of the starch-based adhesive, the mass ratio of starch to acrylamide to water is 2:1:5, and the addition amount of ammonium ceric nitrate is 3-5% of the mass of starch.

In the preparation of the starch-based adhesive, the adding amount of the trihydroxymethyl phenol is 3-5% of the mass of the filter residue, the adding amount of the closed isocyanate is 1-3% of the mass of the filter residue, and the adding amount of the deionized water is 2-3 times of the mass of the filter residue.

In the preparation of the reaction solution, the mass ratio of the polyvinyl alcohol solution with the mass fraction of 25% to the 3, 4-dihydroxybenzoic acid solution with the mass fraction of 30% is 2: 1.

In the preparation of the porous dicalcium silicate powder, the mass ratio of the calcined substance to the methylcellulose and the calcium phosphate is 90:3: 1.

In the preparation of the porous dicalcium silicate powder, the mass ratio of the ball-milling powder to the deionized water is 8:1, the temperature for heat-preservation sintering is 1200-1400 ℃, and the time for heat-preservation sintering is 30-40 min.

The beneficial technical effects of the invention are as follows:

(1) the invention firstly takes starch as a biomass material, graft-modifies the starch and acrylamide, then takes trihydroxymethyl phenol and isocyanate as a cross-linking agent to synthesize starch-based adhesive, then takes calcium nitrate and silica sol as raw materials, prepares porous dicalcium silicate by spray drying and microwave sintering, then mixes polyvinyl alcohol and 3, 4-dihydroxybenzoic acid and then stirs for reaction to obtain reaction liquid, finally mixes the starch-based adhesive, the porous dicalcium silicate, the reaction liquid and catechol oxidase for reaction to finally prepare the water-resistant high-viscosity biomass wallpaper adhesive. The carbon chain of acrylamide can be complexed with water molecules to form a net structure among macromolecules, so that the bonding strength of wallpaper adhesive in a humid environment is increased, meanwhile, trihydroxymethyl phenol and isocyanate are used as cross-linking agents to increase the cross-linking strength of starch-based adhesive, the bonding strength of the wallpaper adhesive is improved again, in addition, a reaction liquid obtained after the mixed reaction of polyvinyl alcohol and 3, 4-dihydroxybenzoic acid, porous dicalcium silicate and oxidase are added, wherein the polyvinyl alcohol solution and the 3, 4-dihydroxybenzoic acid solution are subjected to esterification reaction firstly, so that catechol functional groups are introduced, then the esterification reaction is carried out with catechol oxidase for the second time, catechol groups are oxidized by the catechol oxidase to form a catechol structure, a Michael addition reaction can be carried out among the catechins to form covalent bond cross-linking points, and finally the in-situ polymerization is carried out on the surfaces of the porous dicalcium silicate and the starch-based adhesive, and a complete reticular cross-linked structure is generated between the porous dicalcium silicate and the starch-based adhesive, so that the bonding strength of the wallpaper adhesive is improved, the generated reticular polymer cross-linked structure has good hydrophobicity, and the added porous dicalcium silicate has hydration performance, so that hydration reaction can be generated when the wallpaper adhesive is contacted with water in a humid environment, a compact and firm hydration product is formed, the filling and crosslinking effects are achieved, the hydration product and the reticular polymer cross-linked structure can prevent the penetration of outer-layer water, the water resistance of the wallpaper adhesive is improved for the second time, and the generated hydration product has stable property and is difficult to oxidize and deteriorate.

Detailed Description

Mixing starch, acrylamide and water according to the mass ratio of 2:1:5, then putting the mixture into a four-neck flask, adding ammonium ceric nitrate accounting for 3-5% of the mass of the starch into the four-neck flask, putting the four-neck flask into a water bath kettle, heating to 70-80 ℃, stirring for reaction for 2-3 hours, and filtering and separating to obtain filter residues; putting the obtained filter residue into a beaker, adding trihydroxymethyl phenol accounting for 3-5% of the mass of the filter residue, blocked isocyanate accounting for 1-3% of the mass of the filter residue and deionized water accounting for 2-3 times of the mass of the filter residue into the beaker, moving the beaker into a water bath pot, heating to 60-70 ℃, stirring and reacting for 40-60 min to obtain starch-based adhesive for later use; according to CaO/SiO₂Weighing calcium nitrate tetrahydrate and silica sol in a molar ratio of 2:1, mixing and stirring for 1-2 hours to obtain a mixed solution, and performing spray drying on the mixed solution at a spray drying rate of 1000mL/h to obtain spray-dried powder; putting the obtained spray-dried powder into a sintering furnace, pre-sintering at 700-800 ℃ for 10-15 min, mixing the pre-sintered substance, methylcellulose and calcium phosphate according to a mass ratio of 90:3:1, and performing ball milling treatment for 2-3 h to obtain ball-milled powder; mixing ball-milling powder and deionized water according to a mass ratio of 8:1, stirring and mixing for 10-15 min, bagging, aging for 24-30 h, transferring into a microwave sintering furnace, heating to 1200-1400 ℃, carrying out heat preservation sintering for 30-40 min, and then carrying out quenching and cooling to room temperature to obtain porous dicalcium silicate powder for later use; mixing 25 mass percent of polyvinyl alcohol solution and 30 mass percent of 3, 4-dihydroxybenzoic acid solution according to the mass ratio of 2:1, then putting the mixture into a reaction kettle, heating to 70-80 ℃, and stirring for reaction for 3-5 hours to obtain reaction liquid; weighing in parts by weightAnd (3) mixing 60-70 parts of standby starch-based glue, 20-30 parts of the reaction liquid, 3-5 parts of standby porous dicalcium silicate powder and 1-2 parts of catechol oxidase, putting the mixture into a colloid mill, and discharging after grinding reaction for 15-20 min to obtain the water-resistant high-viscosity biomass wallpaper glue.

Preparing starch-based glue: mixing starch, acrylamide and water according to the mass ratio of 2:1:5, then putting the mixture into a four-neck flask, adding ammonium ceric nitrate with the mass being 3% of that of the starch into the four-neck flask, putting the four-neck flask into a water bath kettle, heating to 70 ℃, stirring for reaction for 2 hours, and filtering and separating to obtain filter residues;

putting the obtained filter residue into a beaker, adding trihydroxymethyl phenol accounting for 3% of the mass of the filter residue, blocked isocyanate accounting for 1% of the mass of the filter residue and deionized water accounting for 2 times of the mass of the filter residue into the beaker, moving the beaker into a water bath kettle, heating to 60 ℃, and stirring for reacting for 40min to obtain starch-based adhesive;

preparation of porous dicalcium silicate powder:

according to CaO/SiO₂Weighing calcium nitrate tetrahydrate and silica sol in a molar ratio of 2:1, mixing and stirring for 1h to obtain a mixed solution, and performing spray drying on the mixed solution at a spray drying rate of 1000mL/h to obtain spray-dried powder;

putting the obtained spray-dried powder into a sintering furnace, presintering for 10min at 700 ℃, mixing the presintered substance, methylcellulose and calcium phosphate according to the mass ratio of 90:3:1, and performing ball milling treatment for 2h to obtain ball-milled powder;

mixing the ball-milled powder and deionized water according to a mass ratio of 8:1, stirring and mixing for 10min, bagging, ageing for 24h, transferring into a microwave sintering furnace, heating to 1200 ℃, carrying out heat preservation sintering for 30min, and then carrying out quenching and cooling to room temperature to obtain porous dicalcium silicate powder;

preparing a water-resistant high-viscosity biomass wallpaper adhesive:

mixing 25 mass percent of polyvinyl alcohol solution and 30 mass percent of 3, 4-dihydroxybenzoic acid solution according to the mass ratio of 2:1, then putting the mixture into a reaction kettle, heating to 70 ℃, and stirring for reaction for 3 hours to obtain reaction liquid;

weighing 60 parts by weight of standby starch-based glue, 20 parts by weight of the reaction liquid, 3 parts by weight of standby porous dicalcium silicate powder and 1 part by weight of catechol oxidase, mixing, putting into a colloid mill, grinding for 15min, and discharging to obtain the water-resistant high-viscosity biomass wallpaper glue.

Preparing starch-based glue: mixing starch, acrylamide and water according to the mass ratio of 2:1:5, then putting the mixture into a four-neck flask, adding ammonium ceric nitrate with the mass of 4% of the starch into the four-neck flask, putting the four-neck flask into a water bath kettle, heating to 75 ℃, stirring for reaction for 2.5 hours, and filtering and separating to obtain filter residue;

putting the obtained filter residue into a beaker, adding trihydroxymethyl phenol accounting for 4% of the mass of the filter residue, blocked isocyanate accounting for 2% of the mass of the filter residue and deionized water accounting for 2 times of the mass of the filter residue into the beaker, moving the beaker into a water bath kettle, heating to 65 ℃, and stirring for reacting for 50min to obtain starch-based adhesive;

preparation of porous dicalcium silicate powder:

according to CaO/SiO₂Weighing calcium nitrate tetrahydrate and silica sol in a molar ratio of 2:1, mixing and stirring for 1.5 hours to obtain a mixed solution, and performing spray drying on the mixed solution at a spray drying rate of 1000mL/h to obtain spray-dried powder;

putting the obtained spray-dried powder into a sintering furnace, presintering at 750 ℃ for 12min, mixing the presintered substance, methylcellulose and calcium phosphate according to the mass ratio of 90:3:1, and performing ball milling treatment for 2.5h to obtain ball-milled powder;

mixing the ball-milled powder and deionized water according to the mass ratio of 8:1, stirring and mixing for 12min, bagging, ageing for 27h, transferring into a microwave sintering furnace, heating to 1300 ℃, carrying out heat preservation sintering for 35min, and then carrying out quenching and cooling to room temperature to obtain porous dicalcium silicate powder;

preparing a water-resistant high-viscosity biomass wallpaper adhesive:

mixing 25 mass percent of polyvinyl alcohol solution and 30 mass percent of 3, 4-dihydroxybenzoic acid solution according to the mass ratio of 2:1, then putting the mixture into a reaction kettle, heating to 75 ℃, and stirring for reaction for 4 hours to obtain reaction liquid;

weighing 65 parts of standby starch-based glue, 25 parts of the reaction liquid, 4 parts of standby porous dicalcium silicate powder and 1 part of catechol oxidase, mixing, putting into a colloid mill, and discharging after grinding reaction for 17min to obtain the water-resistant high-viscosity biomass wallpaper glue.

Preparing starch-based glue: mixing starch, acrylamide and water according to the mass ratio of 2:1:5, then putting the mixture into a four-neck flask, adding ammonium ceric nitrate with the mass of 5% of the starch into the four-neck flask, putting the four-neck flask into a water bath kettle, heating to 80 ℃, stirring for reaction for 3 hours, and filtering and separating to obtain filter residue;

putting the obtained filter residue into a beaker, adding trihydroxymethyl phenol accounting for 5% of the mass of the filter residue, blocked isocyanate accounting for 3% of the mass of the filter residue and deionized water accounting for 3 times of the mass of the filter residue into the beaker, moving the beaker into a water bath kettle, heating to 70 ℃, and stirring for reacting for 60min to obtain starch-based adhesive;

preparation of porous dicalcium silicate powder:

according to CaO/SiO₂Weighing calcium nitrate tetrahydrate and silica sol in a molar ratio of 2:1, mixing and stirring for 2 hours to obtain a mixed solution, and performing spray drying on the mixed solution at a spray drying rate of 1000mL/h to obtain spray-dried powder;

putting the obtained spray-dried powder into a sintering furnace, presintering for 15min at 800 ℃, mixing the presintered substance, methylcellulose and calcium phosphate according to the mass ratio of 90:3:1, and performing ball milling treatment for 3h to obtain ball-milled powder;

mixing the ball-milled powder and deionized water according to a mass ratio of 8:1, stirring and mixing for 15min, bagging, ageing for 30h, transferring into a microwave sintering furnace, heating to 1400 ℃, carrying out heat preservation sintering for 40min, and then carrying out quenching and cooling to room temperature to obtain porous dicalcium silicate powder;

preparing a water-resistant high-viscosity biomass wallpaper adhesive:

mixing 25 mass percent of polyvinyl alcohol solution and 30 mass percent of 3, 4-dihydroxybenzoic acid solution according to the mass ratio of 2:1, then putting the mixture into a reaction kettle, heating to 80 ℃, and stirring for 5 hours to obtain reaction liquid;

weighing 70 parts of standby starch-based glue, 30 parts of the reaction liquid, 5 parts of standby porous dicalcium silicate powder and 2 parts of catechol oxidase, mixing, putting into a colloid mill, grinding for 20min, and discharging to obtain the water-resistant high-viscosity biomass wallpaper glue.

Comparative example 1: the procedure was essentially the same as in example 2, except that the conventional biomass-based gum was used instead of the starch-based gum of the present invention.

Comparative example 2: essentially the same procedure as in example 2 was followed except that the porous dicalcium silicate powder was absent.

Comparative example 3: a water-resistant high-viscosity biomass wallpaper adhesive produced by a company in Thizhou.

The detection method of the water resistance comprises the following steps: two glass sheets were bonded using the wallpaper adhesives prepared in examples and comparative examples, and the dried bonded glass sheets were immersed in water at 55 ℃ to measure the time to open the adhesive.

And (3) testing the peel strength: the wallpaper glues prepared in the examples and comparative examples were adhered to samples of tin-plated flat copper wires cut into strips of 10mm width after coating with wallpaper, and the 90-degree peel strength of the same samples was tested again after being left for one week on a peel strength tester, and the results are shown in table 1.

And (3) moisture regain testing: the wallpaper glue prepared in the examples and the comparative examples is coated on the two surfaces of the wallpaper, and the coating amount is 10g/m²And testing the moisture regain after drying, testing the environmental temperature at 35 ℃ and the relative humidity at 55%, testing the moisture regain for 30 days and 60 days respectively, and observing whether the appearance is deteriorated and pulverized.

Table 1: determination result of wallpaper adhesive performance

Detecting items	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2	Comparative example 3
							Water resistance (d)	24	24	25	15	11	16
Peel strength (N/mm)	1.55	1.57	1.58	0.86	1.12	1.14
							30 days moisture regain (%)	0.45	0.44	0.42	0.84	0.96	0.83
60-day moisture regain (%)	0.90	0.89	0.86	1.24	1.35	1.23
							Appearance of the product	Powdering without deterioration	Powdering without deterioration	Powdering without deterioration	Deterioration and pulverization	Deterioration and pulverization	Deterioration and pulverization

In conclusion, table 1 shows that the water-resistant high-viscosity biomass wallpaper adhesive disclosed by the invention has very excellent water resistance, can reach a water-resistant period of 24-25 d in a soaking experiment, is high in peel strength and good in adhesive property, is low in moisture regain after 60 days in a humid environment, does not go bad and pulverizes, and has a wide application prospect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible, and all changes, equivalents and modifications that fall within the true spirit and scope of the invention are therefore intended to be embraced therein.