阅读说明：本技术 一种黄河泥砂建筑应用抗裂、粘结、保温砂浆干材料的制备方法 (Preparation method of anti-crack, adhesive and heat-insulating mortar dry material for yellow river silt construction ) 是由 申童 刘强 刘兆瑞 于 2017-11-09 设计创作，主要内容包括：本发明公开了一种黄河泥砂建筑应用抗裂、粘结、保温砂浆干材料及其制备方法,其中砂浆干材料由黄河砂,水泥,粉煤灰,石膏,骨粉,木质纤维素,抗裂纤维和自制粘合剂组成；本发明的黄河泥砂建筑应用抗裂、粘结、保温砂浆干材料,扩展了建筑抹灰材料的的原材料范围,单独采用黄河泥砂,不用配合粗砂、天然砂等常规砂石即可达到抹灰砂浆的粘结强度和抗压强度；变废为宝,解决了黄河泥砂淤积河道问题；本发明通过各个物料的成分和添加比例的选择,克服了抹灰砂浆中出现的裂缝、空鼓的问题,具有抗裂防空鼓的作用,粘结性能好；用水量小,凝结时间短,抹灰不分层,保水率高,具有较高的粘结强度和抗压强度,收缩率低,抗冻抗渗,保温性能好。(The invention discloses an anti-crack, bonding and heat-insulating mortar dry material for yellow river silt building and a preparation method thereof, wherein the mortar dry material consists of yellow river silt, cement, fly ash, gypsum, bone meal, lignocellulose, anti-crack fiber and a self-made adhesive; the yellow river silt building of the invention uses the crack-resistant, bonding and heat-insulating mortar dry material, expands the raw material range of building plastering materials, and can achieve the bonding strength and the compressive strength of plastering mortar by singly adopting yellow river silt without matching with conventional gravels such as coarse sand, natural sand and the like; changing waste into valuable, and solving the problem that the yellow river silt is deposited on the river channel; the invention overcomes the problems of cracks and hollowing in plastering mortar by selecting the components and the adding proportion of each material, has the functions of crack resistance and hollowing resistance and has good bonding property; the water consumption is small, the setting time is short, the plastering is not layered, the water retention rate is high, the bonding strength and the compressive strength are higher, the shrinkage rate is low, the anti-freezing and anti-permeability performances are good.)

1. A preparation method of a crack-resistant, bonding and heat-insulating mortar dry material for yellow river silt building application is characterized by comprising the following steps: the method comprises the following steps:

firstly, adding polyvinyl alcohol into water with the weight 6-8 times of that of the polyvinyl alcohol to dissolve the polyvinyl alcohol, adding 30% hydrogen peroxide solution, stirring and reacting for half an hour, adding starch water slurry, continuously stirring and reacting for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 3-4, and uniformly mixing; the mass ratio of the polyvinyl alcohol to the 30% hydrogen peroxide solution to the starch water slurry is 1: 0.01-0.05: 1-2;

adding methyltrimethoxysilane into water with the weight being 10-15 times of that of the methyltrimethoxysilane, stirring to obtain a solution, adjusting the pH to 2-3 by using hydrochloric acid, heating to 40-50 ℃, hydrolyzing for 10-15 hours to obtain a cross-linked solution, adding hydroxypropyl methyl cellulose into the cross-linked solution, stirring and mixing uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose; wherein the mass ratio of the methyltrimethoxysilane to the hydroxypropyl methylcellulose is 1: 2-5;

thirdly, mixing the starch modified polyvinyl alcohol particles obtained in the step I and the silane modified hydroxypropyl methyl cellulose obtained in the step II according to a mass ratio of 1-3: 1, uniformly mixing to obtain a self-made adhesive;

and fourthly, uniformly mixing 50-62 parts by weight of yellow river sand, 30-40 parts by weight of cement, 3-10 parts by weight of fly ash, 2-5 parts by weight of gypsum, 0.5-2 parts by weight of bone meal, 0.5-2 parts by weight of lignocellulose, 0.2-1 part by weight of anti-crack fiber and 5-15 parts by weight of the self-made adhesive obtained in the third step to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river sand building.

2. The preparation method of the crack-resistant, adhesive and heat-insulating mortar dry material for the yellow river silt building according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:

firstly, adding polyvinyl alcohol into water with the weight 7 times of that of the polyvinyl alcohol for dissolving, adding 30% hydrogen peroxide solution, stirring for oxidation reaction for half an hour, adding starch water slurry, continuously stirring for reaction for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 4, uniformly mixing the components in a ratio of; the mass ratio of the polyvinyl alcohol to the 30% hydrogen peroxide solution to the starch water slurry is 1: 0.04: 2;

adding methyltrimethoxysilane into water with the weight being 12 times of that of the mixture, stirring to obtain a solution, regulating the pH value to 2 by using hydrochloric acid, heating to 45 ℃, hydrolyzing for 12 hours to obtain a cross-linked solution, adding hydroxypropyl methyl cellulose into the cross-linked solution, stirring and mixing uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose; wherein the mass ratio of the methyltrimethoxysilane to the hydroxypropyl methylcellulose is 1: 4;

thirdly, mixing the starch modified polyvinyl alcohol particles obtained in the step I and the silane modified hydroxypropyl methyl cellulose obtained in the step II according to a mass ratio of 2: 1, uniformly mixing to obtain a self-made adhesive;

and fourthly, uniformly mixing 55 parts of yellow river sand, 35 parts of cement, 5 parts of fly ash, 3.5 parts of gypsum, 0.8 part of bone meal, 0.5 part of lignocellulose, 0.3 part of anti-crack fiber and 10 parts of the self-made adhesive obtained in the third step to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river sand building.

Technical Field

The invention relates to the technical field of building materials, in particular to a preparation method of a crack-resistant, bonding and heat-insulating mortar dry material for yellow river silt building.

Background

For a long time, sand used in building mortar is divided into four specifications of coarse, medium, fine and extra-fine according to fineness modulus, and the fineness modulus is 3.7-3.1, 3.0-2.3, 2.2-1.6 and 1.5-0.7 respectively; the fineness modulus of the common building sand is 3.7-1.6, and the small amount of coarse sand and fine sand is calculated according to the following ratio of 4: 1 by mass. The yellow river sand is also called yellow river top sand and yellow river extra fine sand, because the modulus of the sand is only 0.7, the sand is greatly lower than the modulus requirement of common concrete, the texture is fine, the mud content of the sand is high, generally about 5.8 percent, the mud block content is 10.2 percent and is far higher than the requirement that the highest value of the mud content of the sand for preparing concrete in China is 5 percent and the highest value of the mud block content is 2 percent, the sand has high mud content and absorbs much water, the cracking of a building is easily caused, the construction requirement of the concrete is not met in principle, a large amount of coarse sand, natural sand or artificial sand is required to be added for mixing at present, the physical and mechanical properties and the durability of the yellow river sand mortar are improved, and the sand cannot be used as a sand stone material of the concrete independently.

The amount of the yellow river sand is large, the annual average sand conveying amount from midstream to downstream of the yellow river is 16 hundred million tons, 4 hundred million tons of the yellow river sand are deposited on a downstream riverbed, and the yellow river sand is deposited to have huge potential flood overflow hazards, so that the safety of lives and properties of people at two sides of the yellow river is seriously endangered, and the development of economic construction of a yellow river basin is limited, so that the yellow river sand is turned into wealth to be urgently solved.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a preparation method of a crack-resistant, bonding and heat-insulating mortar dry material for yellow river silt building.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the anti-crack, adhesive and heat-insulating mortar dry material for the yellow river silt building comprises the following raw materials in parts by weight: 50-62 parts of yellow river sand, 30-40 parts of cement, 3-10 parts of fly ash, 2-5 parts of gypsum, 0.5-2 parts of bone meal, 0.1-2 parts of lignocellulose, 0.2-1 part of anti-crack fiber and 5-15 parts of a self-made adhesive;

the self-made adhesive is obtained according to the following steps:

firstly, adding polyvinyl alcohol into water with the weight 6-8 times of that of the polyvinyl alcohol to dissolve the polyvinyl alcohol, adding 30% hydrogen peroxide solution, stirring and reacting for half an hour, adding starch water slurry, continuously stirring and reacting for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 3-4, and uniformly mixing; the mass ratio of the polyvinyl alcohol to the 30% hydrogen peroxide solution to the starch water slurry is 1: 0.01-0.05: 1-2;

adding methyltrimethoxysilane into water with the weight being 10-15 times of that of the methyltrimethoxysilane, stirring to obtain a solution, adjusting the pH to 2-3 by using hydrochloric acid, heating to 40-50 ℃, hydrolyzing for 10-15 hours to obtain a cross-linked solution, adding hydroxypropyl methyl cellulose into the cross-linked solution, stirring and mixing uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose; wherein the mass ratio of the methyltrimethoxysilane to the hydroxypropyl methylcellulose is 1: 2-5;

thirdly, mixing the starch modified polyvinyl alcohol particles obtained in the step I and the silane modified hydroxypropyl methyl cellulose obtained in the step II according to a mass ratio of 1-3: 1 to obtain the self-made adhesive.

Preferably, the feed consists of the following raw materials in parts by weight: 55-60 parts of yellow river sand, 32-38 parts of cement, 4-8 parts of fly ash, 3-4 parts of gypsum, 0.5-1 part of bone meal, 0.5-1 part of lignocellulose, 0.2-0.5 part of anti-crack fiber and 8-12 parts of a self-made adhesive; the length of the anti-crack fiber is 3-19 mm.

Preferably, the self-made adhesive is obtained by the following steps:

firstly, adding polyvinyl alcohol into water with the weight 7 times of that of the polyvinyl alcohol for dissolving, adding 30% hydrogen peroxide solution, stirring for oxidation reaction for half an hour, adding starch water slurry, continuously stirring for reaction for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 4, uniformly mixing the components in a ratio of; the mass ratio of the polyvinyl alcohol to the 30% hydrogen peroxide solution to the starch water slurry is 1: 0.04: 2;

adding methyltrimethoxysilane into water with the weight being 12 times of that of the mixture, stirring to obtain a solution, regulating the pH value to 2 by using hydrochloric acid, heating to 45 ℃, hydrolyzing for 12 hours to obtain a cross-linked solution, adding hydroxypropyl methyl cellulose into the cross-linked solution, stirring and mixing uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose; wherein the mass ratio of the methyltrimethoxysilane to the hydroxypropyl methylcellulose is 1: 4;

thirdly, mixing the starch modified polyvinyl alcohol particles obtained in the step I and the silane modified hydroxypropyl methyl cellulose obtained in the step II according to a mass ratio of 2: 1 to obtain the self-made adhesive.

Preferably, the feed consists of the following raw materials in parts by weight: 55 parts of yellow river sand, 35 parts of cement, 5 parts of fly ash, 3.5 parts of gypsum, 0.8 part of bone meal, 0.5 part of lignocellulose, 0.3 part of anti-crack fiber and 10 parts of self-made adhesive; the length of the anti-crack fiber is 6 mm.

The invention also comprises a preparation method of the anti-crack, bonding and heat-insulating mortar dry material for the yellow river silt building, which comprises the following steps:

firstly, adding polyvinyl alcohol into water with the weight 6-8 times of that of the polyvinyl alcohol to dissolve the polyvinyl alcohol, adding 30% hydrogen peroxide solution, stirring and reacting for half an hour, adding starch water slurry, continuously stirring and reacting for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 3-4, and uniformly mixing; the mass ratio of the polyvinyl alcohol to the 30% hydrogen peroxide solution to the starch water slurry is 1: 0.01-0.05: 1-2;

adding methyltrimethoxysilane into water with the weight being 10-15 times of that of the methyltrimethoxysilane, stirring to obtain a solution, adjusting the pH to 2-3 by using hydrochloric acid, heating to 40-50 ℃, hydrolyzing for 10-15 hours to obtain a cross-linked solution, adding hydroxypropyl methyl cellulose into the cross-linked solution, stirring and mixing uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose; wherein the mass ratio of the methyltrimethoxysilane to the hydroxypropyl methylcellulose is 1: 2-5;

thirdly, mixing the starch modified polyvinyl alcohol particles obtained in the step I and the silane modified hydroxypropyl methyl cellulose obtained in the step II according to a mass ratio of 1-3: 1, uniformly mixing to obtain a self-made adhesive;

and fourthly, uniformly mixing 50-62 parts by weight of yellow river sand, 30-40 parts by weight of cement, 3-10 parts by weight of fly ash, 2-5 parts by weight of gypsum, 0.5-2 parts by weight of bone meal, 0.5-2 parts by weight of lignocellulose, 0.2-1 part by weight of anti-crack fiber and 5-15 parts by weight of the self-made adhesive obtained in the third step to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river sand building.

A preferred method of preparation comprises the steps of:

firstly, adding polyvinyl alcohol into water with the weight 7 times of that of the polyvinyl alcohol for dissolving, adding 30% hydrogen peroxide solution, stirring for oxidation reaction for half an hour, adding starch water slurry, continuously stirring for reaction for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 4, uniformly mixing the components in a ratio of; the mass ratio of the polyvinyl alcohol to the 30% hydrogen peroxide solution to the starch water slurry is 1: 0.04: 2;

adding methyltrimethoxysilane into water with the weight being 12 times of that of the mixture, stirring to obtain a solution, regulating the pH value to 2 by using hydrochloric acid, heating to 45 ℃, hydrolyzing for 12 hours to obtain a cross-linked solution, adding hydroxypropyl methyl cellulose into the cross-linked solution, stirring and mixing uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose; wherein the mass ratio of the methyltrimethoxysilane to the hydroxypropyl methylcellulose is 1: 4;

thirdly, mixing the starch modified polyvinyl alcohol particles obtained in the step I and the silane modified hydroxypropyl methyl cellulose obtained in the step II according to a mass ratio of 2: 1, uniformly mixing to obtain a self-made adhesive;

and fourthly, uniformly mixing 55 parts of yellow river sand, 35 parts of cement, 5 parts of fly ash, 3.5 parts of gypsum, 0.8 part of bone meal, 0.5 part of lignocellulose, 0.3 part of anti-crack fiber and 10 parts of the self-made adhesive obtained in the third step to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river sand building.

Compared with the prior art, the invention has the following advantages:

the yellow river silt building of the invention uses the crack-resistant, bonding and heat-insulating mortar dry material, expands the raw material range of building plastering materials, and can achieve the bonding strength and the compressive strength of plastering mortar by singly adopting yellow river silt without matching with conventional gravels such as coarse sand, natural sand and the like; moreover, waste is changed into valuable, and the problem that the yellow river silt is deposited on the river channel is solved;

the yellow river silt building applied crack-resistant, bonding and heat-insulating mortar dry material overcomes the problem of crack hollowing of the traditional plastering mortar by selecting the components and the adding proportion of each material, has the functions of crack resistance and hollowing resistance and has good bonding property; the water consumption is small, the consistency is moderate, the setting time is short, the plastering is not layered, the water retention rate is high, the bonding strength and the compressive strength are higher, the shrinkage rate is low, the frost resistance and the impermeability are high, and the thermal insulation performance is good.

The yellow river sand adopted in the anti-crack, bonding and heat-preservation mortar dry material for the yellow river sand building can not be independently used for building plastering materials due to small modulus and high mud content, and is required to be mixed with coarse sand, artificial sand and other sand in principle, and the addition amount of the yellow river sand is smaller and generally accounts for 5-10% of the total amount of the sand.

The starch modified polyvinyl alcohol component in the self-made adhesive disclosed by the invention not only retains the advantages of good water solubility, no toxicity and low cost of polyvinyl alcohol, but also crosslinks a large amount of hydroxyl groups in the polyvinyl alcohol with starch, so that the problems of large hydrophilicity and poor water resistance of a large amount of hydroxyl groups contained in the polyvinyl alcohol are solved; according to the silane modified hydroxypropyl methyl cellulose component in the self-made adhesive, methyl trimethoxy silane is firstly adopted for hydrolysis and crosslinking to form a net structure, and then hydroxypropyl methyl cellulose is dispersed in the net structure to play a supporting and connecting role, and the hydroxypropyl methyl cellulose also has viscosity, so that a good bonding effect can be achieved after water is added into a plastering material.

The self-made adhesive is in a granular state and can be uniformly mixed with other components, so that the self-made adhesive is convenient to transport and store on a building, the performance of the self-made adhesive can be shown after water is added in the self-made adhesive during use, and the adhesive strength and the adhesive effect of building plastering materials can be effectively improved.

Detailed Description

The invention is further described with reference to specific embodiments.

The anti-crack fiber is prepared by adopting 100 percent of polypropylene as a raw material through unique process and equipment and through the procedures of melting, extruding, wire drawing, cutting and the like, and is specially added into mortar and cement concrete to play a role in resisting cracks and permeability. In order to ensure that the anti-crack fibers can be well dispersed in mortar and cement concrete, the anti-crack fibers are subjected to surface treatment by a special process before cutting. It will also be referred to as polypropylene fiber since it primarily uses polypropylene as a raw material. The anti-crack fiber acts on mortar and cement concrete, and can effectively prevent the generation and development of maintenance system cracks of the mortar and the cement concrete by virtue of the unique properties of tensile strength, dispersity, melting point, burning point, acid and alkali resistance and the like.

The anti-crack fiber used in the embodiment of the invention is a polypropylene fiber with the length of 3-19 mm produced by Shandong Fuying Biotechnology Limited.

Example 1

A mortar dry material for crack resistance, adhesion and heat preservation in yellow river silt building application is composed of the following raw materials: 50kg of yellow river sand, 30kg of cement, 3kg of fly ash, 2kg of gypsum, 0.5kg of bone meal, 0.1kg of lignocellulose, 0.2kg of anti-crack fiber and 5kg of self-made adhesive;

the self-made adhesive is obtained according to the following steps:

firstly, adding 10kg of polyvinyl alcohol into 60kg of water for dissolving, adding 0.1kg of 30% hydrogen peroxide solution, stirring for reacting for half an hour, adding 10kg of starch water slurry, continuously stirring for reacting for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 3, uniformly mixing the components in a ratio;

adding 1kg of methyltrimethoxysilane into 10kg of water, stirring to obtain a solution, regulating the pH to 2 by using hydrochloric acid, heating to 40 ℃, hydrolyzing for 10 hours to obtain a cross-linked solution, adding 2kg of hydroxypropyl methyl cellulose into the cross-linked solution, stirring and uniformly mixing, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose;

and thirdly, uniformly mixing 3kg of the starch modified polyvinyl alcohol particles obtained in the step I and 3kg of the silane modified hydroxypropyl methyl cellulose obtained in the step II to obtain the self-made adhesive.

50kg of yellow river sand, 30kg of cement, 3kg of fly ash, 2kg of gypsum, 0.5kg of bone meal, 0.1kg of lignocellulose, 0.2kg of anti-crack fiber and 5kg of self-made adhesive are uniformly mixed to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river sand building.

Example 2

The anti-crack, adhesive and heat-insulating mortar dry material for the yellow river silt building comprises the following raw materials in parts by weight: 62kg of yellow river sand, 40kg of cement, 10kg of fly ash, 5kg of gypsum, 2kg of bone meal, 2kg of lignocellulose, 1kg of anti-crack fiber and 15kg of self-made adhesive;

the self-made adhesive is obtained according to the following steps:

adding 15kg of polyvinyl alcohol into 120kg of water for dissolving, adding 0.75kg of 30% hydrogen peroxide solution, stirring for reacting for half an hour, adding 30kg of starch water slurry, continuing stirring for reacting for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 4, uniformly mixing the components in a ratio of;

adding 1kg of methyltrimethoxysilane into 15kg of water, stirring to obtain a solution, regulating the pH value to 3 by using hydrochloric acid, heating to 50 ℃, hydrolyzing for 15 hours to obtain a cross-linked solution, adding 5kg of hydroxypropyl methyl cellulose into the cross-linked solution, stirring uniformly, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose;

and thirdly, uniformly mixing 15kg of the starch modified polyvinyl alcohol particles obtained in the step I and 5kg of the silane modified hydroxypropyl methyl cellulose obtained in the step II to obtain the self-made adhesive.

62kg of yellow river sand, 40kg of cement, 10kg of fly ash, 5kg of gypsum, 2kg of bone meal, 2kg of lignocellulose, 1kg of anti-crack fiber and 15kg of self-made adhesive are uniformly mixed to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river silt building.

Example 3

A mortar dry material for crack resistance, adhesion and heat preservation in yellow river silt building application is composed of the following raw materials: 60kg of yellow river sand, 32kg of cement, 4kg of fly ash, 3kg of gypsum, 0.5kg of bone meal, 0.5kg of lignocellulose, 0.2kg of anti-crack fiber and 8kg of self-made adhesive; the length of the anti-crack fiber is 3-19 mm;

the self-made adhesive is obtained according to the following steps:

firstly, adding 10kg of polyvinyl alcohol into 65kg of water for dissolving, adding 0.2kg of 30% hydrogen peroxide solution, stirring for reacting for half an hour, adding 15kg of starch water slurry, continuously stirring for reacting for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 3.5 are evenly mixed according to the proportion;

adding 1kg of methyltrimethoxysilane into 14kg of water, stirring to obtain a solution, regulating the pH to 2.5 by using hydrochloric acid, heating to 46 ℃, hydrolyzing for 12 hours to obtain a cross-linked solution, adding 4kg of hydroxypropyl methyl cellulose, stirring uniformly, and spray drying to obtain silane modified hydroxypropyl methyl cellulose;

and thirdly, uniformly mixing 4kg of the starch modified polyvinyl alcohol particles obtained in the step I and 4kg of the silane modified hydroxypropyl methyl cellulose obtained in the step II to obtain the self-made adhesive.

55kg of yellow river sand, 32kg of cement, 4kg of fly ash, 3kg of gypsum, 0.5kg of bone meal, 0.5kg of lignocellulose, 0.2kg of anti-crack fiber and 8kg of self-made adhesive are uniformly mixed to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river sand building.

Example 4

A mortar dry material for crack resistance, adhesion and heat preservation in yellow river silt building application is composed of the following raw materials: 55kg of yellow river sand, 35kg of cement, 5kg of fly ash, 3.5kg of gypsum, 0.8kg of bone meal, 0.5kg of lignocellulose, 0.3kg of anti-crack fiber and 10kg of self-made adhesive; the length of the anti-crack fiber is 6 mm;

the self-made adhesive is obtained according to the following steps:

firstly, adding 15kg of polyvinyl alcohol into 105kg of water for dissolving, adding 0.6kg of 30% hydrogen peroxide solution, stirring for oxidation reaction for half an hour, adding 30kg of starch water slurry, continuing stirring for reaction for half an hour, and performing spray drying to obtain starch modified polyvinyl alcohol particles; wherein the starch water slurry is prepared from starch and water according to the mass ratio of 1: 4, uniformly mixing the components in a ratio of;

adding 1kg of methyltrimethoxysilane into 12kg of water, stirring to obtain a solution, regulating the pH to 2 by using hydrochloric acid, heating to 45 ℃, hydrolyzing for 12 hours to obtain a cross-linked solution, adding 4kg of hydroxypropyl methyl cellulose into the cross-linked solution, stirring and uniformly mixing, and performing spray drying to obtain silane modified hydroxypropyl methyl cellulose;

and thirdly, uniformly mixing 5kg of the starch modified polyvinyl alcohol particles obtained in the step I and 5kg of the silane modified hydroxypropyl methyl cellulose obtained in the step II to obtain the self-made adhesive.

55kg of yellow river sand, 35kg of cement, 5kg of fly ash, 3.5kg of gypsum, 0.8kg of bone meal, 0.5kg of lignocellulose, 0.3kg of anti-crack fiber and 10kg of self-made adhesive are uniformly mixed to obtain the anti-crack, bonding and heat-insulating mortar dry material for the yellow river silt building.

The yellow river silt building application anti-cracking, bonding and heat-preservation mortar dry material obtained in the embodiment 1-4 is added with water and uniformly mixed to obtain plastering mortar, and the plastering mortar is directly subjected to mechanical spraying construction or plastering construction on a building wall, so that the mortar has no crack and no hollowing. The yellow river silt building application crack resistance, bonding and heat preservation mortar dry materials of the embodiments 1-4 are detected according to the building mortar basic performance test method standard JGJ/T70-2009, the heat conductivity coefficient is detected on a Shanghai Rongda mortar heat conductivity coefficient tester, and the performances are shown in Table 1.

Table 1 table of main properties of crack-resistant, adhesive, thermal mortar dry materials for yellow river silt construction applications of examples 1 to 4

The yellow river silt building applied crack-resistant, bonding and heat-insulating mortar dry material has the advantages of low water consumption, high water retention rate, moderate consistency, no layering, high tensile bonding strength, high compressive strength, low shrinkage, freezing resistance and seepage resistance.