CN112194436B - Machine-sprayed putty material and preparation method thereof - Google Patents
Machine-sprayed putty material and preparation method thereof Download PDFInfo
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- CN112194436B CN112194436B CN202011118808.1A CN202011118808A CN112194436B CN 112194436 B CN112194436 B CN 112194436B CN 202011118808 A CN202011118808 A CN 202011118808A CN 112194436 B CN112194436 B CN 112194436B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention relates to a machine-sprayed putty material and a preparation method thereof, wherein the preparation raw materials of the machine-sprayed putty material comprise: 0.5-35 parts of base material; 0.05 part to 0.5 part of water reducing agent; 0.1 to 0.6 portion of cellulose ether; 0.02 to 0.2 portion of modified hydroxypropyl starch ether; 65-90 parts of a filler; the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent; the viscosity of the cellulose ether at 20 ℃ is 20000mPa & s-40000mPa & s; the modified hydroxypropyl starch ether has a degree of substitution of 0.05-0.08 and a viscosity of 400-1200 mPa.s at 20 ℃. The putty material is suitable for mechanical spraying, has good leveling property, can improve the construction efficiency, reduce the mechanical loss of spraying equipment, improve the construction continuity, and can form a smooth coating without manual leveling after being sprayed on a wall.
Description
Technical Field
The invention relates to the field of building materials, in particular to a machine-spraying putty material and a preparation method thereof.
Background
The high-pressure airless spraying brings technical innovation for putty construction, and the mechanical spraying has the following advantages: the falling ash can be reduced, and the excessive loss of the putty is avoided; the construction is more convenient, the spraying of the top plate can be finished without a scaffold, no construction dead angle exists, and the positions of the internal corner, the external corner, the wall surface and the like can be sprayed; the construction efficiency is high, and a flush coater can spray 800 ~ 1000 squares every day, is equivalent to the work load of 15 skilled workers a day, shortens the time limit for a project greatly, has reduced intensity of labour, has saved the expense of turnover materials such as scaffold frame again. Along with the continuous improvement of cost of labor, mechanical spraying has practiced thrift the manpower, the material resources cost of construction greatly through improving efficiency of construction, has also avoided the problem that construction quality is undulant along with constructor proficiency simultaneously, has improved the stability of quality.
The construction process of spraying putty at present comprises the following steps: firstly, mechanical spraying is used for improving the wall mounting speed of putty, then batch scraping and leveling are carried out manually, and the putty sold on the market is not classified according to the construction mode, namely the mechanically sprayed putty and the manually batch scraped putty are often mixed, however, the manually batch scraped putty is often strong in thixotropy and free of fluidity, and after the mechanical spraying is carried out on the putty, the pumping resistance is easy to be large during spraying, and the mechanical loss of spraying equipment is increased; and some putty has poor dispersibility and is easy to agglomerate, so that the nozzle is frequently blocked, and the construction continuity is influenced. In addition, the putty can not be like latex paint (the latex paint has leveling property after being sprayed on a wall, and forms a flat and smooth coating through the action of surface tension), and the effect of leveling and smoothing the surface of the putty needs to be realized by manual leveling.
Disclosure of Invention
Based on the above, the machine-sprayed putty material provided by the invention is suitable for mechanical spraying, has good leveling property, can improve the construction efficiency, reduce the mechanical loss of spraying equipment, improve the construction continuity, and can form a flat and smooth coating without manual leveling after being sprayed on a wall.
The preparation raw materials of the machine-spraying putty material comprise, by weight:
the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent;
the viscosity of the cellulose ether at 20 ℃ is 20000mPa & s-40000mPa & s;
the modified hydroxypropyl starch ether has a degree of substitution of 0.05-0.08 and a viscosity of 400-1200 mPa.s at 20 ℃.
In a preferred embodiment, the preparation raw materials of the machine-spraying putty material comprise, by weight:
under a proper proportion, the putty material can be endowed with good fluidity and leveling effect, and can not sag within the construction thickness of 2mm, and the bonding strength is also maintained at a higher level.
In a preferred embodiment, the cellulose ether is selected from hydroxypropyl methyl cellulose ether and/or hydroxyethyl cellulose ether. More preferably hydroxypropyl methyl cellulose ether, and the effect is better when the modified hydroxypropyl starch ether is used together with the hydroxypropyl methyl cellulose ether.
In a preferred embodiment, the binder is selected from inorganic-based binders and/or organic-based binders.
In a preferred embodiment, the inorganic base is white cement. Has the characteristics of water resistance, high bonding strength and good decoration.
In a preferred embodiment, the organic-based binder is a polymer latex powder. When the putty is used in combination with white cement, the workability, bonding strength and flexibility of the putty can be improved.
In a preferred embodiment, the polymer latex powder is selected from one or more of vinyl acetate, ethylene, vinyl acetate, vinyl ether, vinyl versatate, acrylate, styrene, homopolymer of butadiene and copolymer of butadiene.
In a preferred embodiment, the filler is selected from one or more of ground calcium carbonate, kaolin and talc. The ground calcium carbonate has general dispersibility, and if the ground calcium carbonate is added singly, the dispersibility is not good if the kaolin and the talcum powder are not added. When the heavy calcium carbonate is added in a proper amount, the dispersion effect is not influenced, the cost can be reduced, and the hardness, the gloss and the whiteness of the putty can be improved. The kaolin and the talcum powder can be added in any one or mixed, the kaolin is easy to disperse in water, the whiteness is high, the covering power is strong, the talcum powder also has good suspension property and easy dispersibility, and after the putty is stirred by adding water, the kaolin and the talcum powder can be better dispersed and suspended in putty slurry compared with other fillers, are not easy to settle and agglomerate, and the construction continuity is improved. The putty and the water reducing agent which plays roles of adsorption, dispersion, lubrication and wetting work together, so that the putty is better dispersed, the condition that the nozzle is blocked by unhydrated cement particles and sedimentation and agglomeration fillers is greatly reduced, the construction continuity is improved, and the construction efficiency is improved.
In a preferred embodiment, the preparation raw materials of the machine-spraying putty material also comprise an antifoaming agent.
In a preferred embodiment, the base stock is white cement and polymer latex powder; the filler is heavy calcium carbonate, kaolin and talcum powder; the preparation raw materials of the machine-spraying putty material also comprise a defoaming agent;
the white cement is 5-30 parts by weight; the weight portion of the polymer latex powder is 0.5 to 5; the weight portion of the water reducing agent is 0.05 to 0.5; the weight portion of the cellulose ether is 0.1 to 0.6; the weight portion of the modified hydroxypropyl starch ether is 0.02-0.2; the weight portion of the heavy calcium carbonate is 0 to 60 portions; the kaolin accounts for 10 to 40 weight parts; 10-40 parts of talcum powder; the weight portion of the defoaming agent is 0.2 to 0.8.
The invention also provides a preparation method of the machine-sprayed putty material.
A preparation method of a machine-sprayed putty material comprises the following steps:
mixing a base material, a water reducing agent, cellulose ether, modified hydroxypropyl starch ether and a filler;
the base material is 0.5 to 35 parts by weight; the weight portion of the water reducing agent is 0.05 to 0.5; the weight portion of the cellulose ether is 0.1 to 0.6; the weight portion of the modified hydroxypropyl starch ether is 0.02-0.2; the weight portion of the filler is 65-90 portions; the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent; the viscosity of the cellulose ether at 20 ℃ is 20000mPa & s-40000mPa & s; the modified hydroxypropyl starch ether has a degree of substitution of 0.05-0.08 and a viscosity of 400-1200 mPa.s at 20 ℃.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the synergistic effect of the water reducing agent, the low-viscosity cellulose ether and the modified hydroxypropyl starch ether, the putty material is endowed with good fluidity, the mechanical spraying pumping resistance is reduced, the mechanical loss of spraying equipment is reduced, meanwhile, the putty material has a good leveling effect after being applied to a wall, a flat and smooth coating can be formed without manual scraping and leveling, and the putty material can not sag within the construction thickness of 2 mm.
The cellulose ether can play a role in thickening and water retention, improve the workability, enable the base material to have enough water for hydration, and improve the bonding strength of the putty. The invention uses the cellulose ether with low viscosity, which can reduce the viscosity of the putty at low shear rate, further reduce the rheological coefficient (viscosity at low shear rate/viscosity at high shear rate), improve the leveling property, meanwhile, the viscosity of the cellulose ether is positively correlated with the bonding strength of the putty, and the relationship between the leveling property and the bonding strength of the putty is balanced. The inventor of the application finds that the cellulose ether can ensure that the putty material has better leveling property and can also keep larger bonding strength of the putty material within the viscosity range of 20000mPa & s-40000mPa & s. Meanwhile, the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent, can be adsorbed on the surface of the base material, enables the surfaces of the base material and the melamine water reducing agent to have the same charges, then generates electrostatic repulsion force, and simultaneously, the water reducing agent adsorption layer can also generate a steric hindrance effect, so that the base material is dispersed under the combined action of the electrostatic repulsion force and the steric hindrance, and the condition that the unhydrated base material blocks the nozzle is avoided. Meanwhile, the water reducing agent destroys part of the flocculation structure of the base material, releases water to increase free water, and provides fluidity for the putty material through the multi-action, meanwhile, the dispersing capacity of the naphthalene water reducing agent and/or the melamine water reducing agent is not particularly strong, the flocculation structure in the base material is not completely destroyed, after the shear rate is increased, the yield stress and the viscosity of the putty material can not be greatly reduced, and the wall sagging performance of the putty is favorably ensured. After the water reducing agent and the low-viscosity cellulose ether are added, the fluidity and the leveling property of putty are greatly improved, manual scraping is not needed after mechanical spraying, but the thixotropy is deteriorated due to the fact that the yield stress is reduced to a certain extent, the limiting film thickness is reduced, and sagging occurs after slight spraying, so that the modified hydroxypropyl starch ether is added, wherein the hydroxypropyl starch ether is prepared by reacting starch and epoxy propane or epoxy chloropropane under an alkaline condition, the hydroxypropyl has good hydrophilicity, the excellent water retention property of the starch ether can be provided, and the hydroxypropyl is nonionic, is slightly influenced by electrolyte and can be used in a wider range of pH values. And the hydroxypropyl starch ether is negatively charged, can adsorb base materials with positive charges, has good compatibility with the base materials, and is used as a transition bridge to connect the base materials, so that the putty is endowed with a large yield value. The modified hydroxypropyl starch ether with the substitution degree of 0.05-0.08 and the viscosity of 400-1200 mPa & s is obtained by further modifying the hydroxypropyl starch ether, the water-retaining property and the anti-sagging wrapping property of the modified hydroxypropyl starch ether are good, after the modified hydroxypropyl starch ether is added, the modified hydroxypropyl starch ether and the low-viscosity cellulose ether can form a polymer film, the sealing effect is achieved, the water volatilization of the putty is slowed down, a three-dimensional elastic net-shaped structure is formed, the yield stress of the putty is improved, a good synergistic effect is shown among raw materials, the anti-sagging property and the anti-sagging property of the putty can be obviously improved, sagging is not generated when the thickness of the putty is 2mm by one-time spraying, and the opening time of the modified hydroxypropyl starch ether is prolonged. In addition, the addition of the modified hydroxypropyl starch ether can form a stable film on the surface of the base material to wrap the gel material, thereby overcoming the problem of coagulation of the gel material.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The machine-sprayed putty material comprises the following preparation raw materials in parts by weight:
the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent;
the viscosity of the cellulose ether at 20 ℃ is 20000mPa & s-40000mPa & s;
the modified hydroxypropyl starch ether has a degree of substitution of 0.05-0.08 and a viscosity of 400-1200 mPa.s at 20 ℃.
The cellulose ether can play a role in thickening and water retention, improve the workability, enable the base material to have enough water for hydration, and improve the bonding strength of the putty. In addition, the molecular chain of the cellulose ether contains a large number of hydrophilic groups, and the cellulose ether can generate strong hydration with water and generate winding and lapping among molecular chains, so that a three-dimensional network structure is formed in a system, the movement of particles is prevented, and the increase of the viscosity of the putty is expressed. Meanwhile, the large cellulose ether molecular chains are asymmetric, when no external force is applied, the arrangement is disordered, and when the large cellulose ether molecular chains are subjected to the action of shearing force, the long cellulose ether molecular chains turn the long cellulose ether molecular chains to the direction of the shearing force, or the original bent cellulose ether molecular chains stretch and become straight, so that the original three-dimensional network structure is damaged, and the viscosity is reduced. Therefore, after the cellulose ether is added, the putty is plastic fluid and has certain yield value and thixotropy, and the viscosity decreases along with the increase of the shear rate.
The leveling property is related to the rheological coefficient (viscosity at low shear rate/viscosity at high shear rate), the rheological coefficient is small or close to 1, and the leveling property is excellent in the coating process and after film forming. The invention uses the cellulose ether with low viscosity, can reduce the viscosity of the putty at low shear rate, further reduce the rheological coefficient and improve the leveling property. Meanwhile, the viscosity of the cellulose ether is positively correlated with the bonding strength of the putty, and the relationship between the leveling property and the bonding strength of the putty is balanced. The inventor of the application finds that the cellulose ether can ensure that the putty material has better leveling property and can also keep larger bonding strength of the putty material within the viscosity range of 20000mPa & s-40000mPa & s.
Preferably, the cellulose ether is selected from hydroxypropyl methyl cellulose ether and/or hydroxyethyl cellulose ether.
The naphthalene water reducer and/or the melamine water reducer can be adsorbed on the surface of the base material, the surfaces of the naphthalene water reducer and/or the melamine water reducer are charged identically, then electrostatic repulsion is generated, meanwhile, the water reducer adsorption layer can also generate a three-dimensional steric hindrance effect, the base material is dispersed under the combined action of the electrostatic repulsion and the steric hindrance, and the situation that the nozzle is blocked by the unhydrated base material is avoided. Meanwhile, the water reducing agent destroys the flocculation structure of the base material, releases water to increase free water, and provides fluidity for the putty material through the multiple effects, meanwhile, the dispersing capacity of the naphthalene water reducing agent and/or the melamine water reducing agent is not particularly strong, the flocculation structure in the base material is not completely destroyed, when the shear rate is increased, the yield stress and the viscosity of the putty material cannot be greatly reduced, and the sagging performance of the putty on the wall is favorably ensured. If the polycarboxylic acid water reducing agent is used, the dispersing capacity of the polycarboxylic acid water reducing agent is stronger than that of the naphthalene water reducing agent and the melamine water reducing agent, so that the base materials can be thoroughly and uniformly dispersed, the acting force between the base materials is greatly reduced, and the flocculation structure in the base materials can be completely destroyed, so that when the shearing rate of the putty is increased, no flocculation structure can be destroyed, the shearing stress rises linearly, the rheological characteristic of the putty is similar to Newtonian fluid, the yield stress and the viscosity are far smaller than those of the putty added with the naphthalene water reducing agent and/or the melamine water reducing agent, the upper wall can be seriously sagging, and the polycarboxylic acid water reducing agent is not suitable for machine-spraying putty.
Preferably, the water reducing agent is a melamine water reducing agent.
After the water reducing agent and the low-viscosity cellulose ether are added, the fluidity and the leveling property of putty are greatly improved, manual scraping is not needed after mechanical spraying, but the thixotropy is deteriorated due to the fact that the yield stress is reduced to a certain extent, the limiting film thickness is reduced, and sagging occurs after slight spraying, so that the modified hydroxypropyl starch ether is added, wherein the hydroxypropyl starch ether is prepared by reacting starch and epoxy propane or epoxy chloropropane under an alkaline condition, the hydroxypropyl has good hydrophilicity, the excellent water retention property of the starch ether can be provided, and the hydroxypropyl is nonionic, is slightly influenced by electrolyte and can be used in a wider range of pH values. And the hydroxypropyl starch ether is negatively charged, can adsorb base materials with positive charges, has good compatibility with the base materials, and is used as a transition bridge to connect the base materials, so that the putty is endowed with a large yield value. The modified hydroxypropyl starch ether with the substitution degree of 0.05-0.08 and the viscosity of 400-1200 mPa & s is obtained by further modifying the hydroxypropyl starch ether, the water-retaining property and the anti-sagging wrapping property of the modified hydroxypropyl starch ether are good, after the modified hydroxypropyl starch ether is added, the modified hydroxypropyl starch ether and the low-viscosity cellulose ether can form a polymer film, the sealing effect is achieved, the water volatilization of the putty is slowed down, a three-dimensional elastic net-shaped structure is formed, the yield stress of the putty is improved, a good synergistic effect is shown among raw materials, the anti-sagging property and the anti-sagging property of the putty can be obviously improved, sagging is not generated when the thickness of the putty is 2mm by one-time spraying, and the opening time of the modified hydroxypropyl starch ether is prolonged. In addition, the addition of the modified hydroxypropyl starch ether can form a stable film on the surface of the base material to wrap the gel material, thereby overcoming the problem of coagulation of the gel material.
The cellulose ether has long spiral tubular structure with length of 60-100 μm and less branched structure. Starch ether has a structure different from that of cellulose ether, has a short straight chain and a large proportion of branched chain structures, and is in a net structure after being dissolved in water. When the modified hydroxypropyl starch ether is used in combination with hydroxypropyl methyl cellulose ether, the effect is better.
It is understood that modified hydroxypropyl starch ethers having different viscosities and water retentions can be obtained by subjecting hydroxypropyl starch ethers to complex modification processing by chemical reactions such as hydrolysis, oxidation, and crosslinking, and controlling the degree of substitution with hydroxypropyl groups.
According to the invention, through the synergistic effect of the water reducing agent, the low-viscosity cellulose ether and the modified hydroxypropyl starch ether, the putty material is endowed with good fluidity, the mechanical spraying pumping resistance is reduced, the mechanical loss of spraying equipment is reduced, meanwhile, the putty material has a good leveling effect after being applied to a wall, a flat and smooth coating can be formed without manual scraping and leveling, and the putty material can not sag within the construction thickness of 2 mm.
In one embodiment, the binder is selected from inorganic-based binders and/or organic-based binders.
Preferably, the inorganic base material is white cement, and the white cement is an inorganic hydraulic gel material, has the characteristics of water resistance and good decoration, and can be used as a binder to enhance the bonding strength.
Preferably, the organic base material is polymer latex powder, and the polymer latex powder can be re-dispersible latex powder which is an organic gel material and is matched with white cement for use, so that the workability, the bonding strength and the flexibility of the putty can be improved.
Further preferably, the polymer latex powder is selected from one or more of vinyl acetate, ethylene, vinyl acetate, vinyl ether, vinyl versatate, acrylate, styrene, homopolymer of butadiene and copolymer of butadiene.
In one embodiment, the filler is selected from one or more of ground calcium carbonate, kaolin and talc.
Preferably, the weight portion of the heavy calcium carbonate is 0 to 60 portions.
Preferably, the kaolin is 10 to 40 parts by weight.
Preferably, the talcum powder is 10-40 parts by weight.
Wherein, the heavy calcium carbonate has general dispersivity, and if the heavy calcium carbonate is added singly, the dispersivity is not good enough if the kaolin and the talcum powder are not added. When the heavy calcium carbonate is added in a proper amount, the dispersion effect is not influenced, the cost can be reduced, and the hardness, the gloss and the whiteness of the putty can be improved. The kaolin and the talcum powder can be added in any one or mixed, the kaolin is easy to disperse in water, the whiteness is high, the covering power is strong, the talcum powder also has good suspension property and easy dispersibility, and after the putty is stirred by adding water, the kaolin and the talcum powder can be better dispersed and suspended in putty slurry compared with other fillers, are not easy to settle and agglomerate, and the construction continuity is improved. The putty and the water reducing agent which plays roles of adsorption, dispersion, lubrication and wetting work together, so that the putty is better dispersed, the condition that the nozzle is blocked by unhydrated cement particles and sedimentation and agglomeration fillers is greatly reduced, the construction continuity is improved, and the construction efficiency is improved.
Preferably, the filler is selected from a mixture of ground calcium carbonate and kaolin.
Preferably, the filler is selected from a mixture of ground calcium carbonate and talc.
Preferably, the filler is selected from a mixture of ground calcium carbonate, kaolin and talc.
In one embodiment, the preparation raw materials of the machine-spraying putty material further comprise a defoaming agent.
The defoaming agent is selected from one or more of polyether defoaming agent, organic silicon defoaming agent and polyether modified organic silicon defoaming agent. The weight portion of the defoaming agent is 0.2-0.8.
The putty material can be used as an inner wall putty material and an outer wall putty material.
A preparation method of a machine-sprayed putty material comprises the following steps:
mixing a base material, a water reducing agent, cellulose ether, modified hydroxypropyl starch ether and a filler;
the base material is 0.5 to 35 parts by weight; the weight portion of the water reducing agent is 0.05 to 0.5; the weight portion of the cellulose ether is 0.1 to 0.6; the weight portion of the modified hydroxypropyl starch ether is 0.02-0.2; the weight portion of the filler is 65-90 portions; the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent; the viscosity of the cellulose ether at 20 ℃ is 20000mPa & s-40000mPa & s; the modified hydroxypropyl starch ether has a degree of substitution of 0.05-0.08 and a viscosity of 400-1200 mPa.s at 20 ℃.
A using method of a machine-sprayed putty material comprises the following steps:
spraying putty material and water by the mixer, stirring, standing, and stirring again.
The following examples and comparative examples are further described below, and the starting materials used in the following examples can be commercially available, unless otherwise specified, and the equipment used therein can be commercially available, unless otherwise specified. The raw materials involved are as follows:
the vinyl acetate-ethylene latex powder was 5044N, available from Wake.
The water reducer is F10, is a melamine water reducer and is purchased from BASF.
The hydroxypropyl methyl cellulose ether has a viscosity of 30000mPa & s at 20 ℃ and a model of 75RT30000, and is available from Shandong Ruitai chemical Co.
The modified hydroxypropyl starch ether has a degree of substitution of 0.06, a viscosity of 800mPa · S at 20 ℃ and a model number of S301, and is available from Ivy, Inc. in the Netherlands.
The defoaming agent is polyether modified organic silicon, the model is B-340, and the defoaming agent is purchased from Federal Fine chemical Co.
Example 1
The embodiment provides a machine-spraying putty material and a preparation method and a use method thereof, and the method comprises the following steps:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Example 2
The embodiment provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as those in embodiment 1, and are different only in filling, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 40 parts of kaolin and 40 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Example 3
The embodiment provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as those in embodiment 1, and are different only in filling, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 60 parts of heavy calcium carbonate, 10 parts of kaolin and 10 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Example 4
The embodiment provides a machine-spraying putty material, a preparation method and a using method thereof, which are basically the same as the embodiment 1, and are different in the ratio of a water reducing agent to hydroxypropyl methyl cellulose ether to modified hydroxypropyl starch ether, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.5 part of water reducing agent, 0.6 part of hydroxypropyl methyl cellulose ether, 0.15 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Example 5
The embodiment provides a machine-spraying putty material, a preparation method and a using method thereof, which are basically the same as the embodiment 1, and are different in the ratio of a water reducing agent to hydroxypropyl methyl cellulose ether to modified hydroxypropyl starch ether, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.05 part of water reducing agent, 0.1 part of hydroxypropyl methyl cellulose ether, 0.04 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 1
The comparative example provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as those in example 1, and are different only in that no water reducing agent and no filler are added, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent and 80 parts of heavy calcium carbonate in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene emulsion powder, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent and the ground calcium carbonate into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 2
The comparative example provides a machine-spraying putty material, and a preparation method and a use method thereof, which are basically the same as the example 1, and are different in that modified hydroxypropyl starch ether is not added, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene latex powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 3
The comparative example provides a machine-spraying putty material, and a preparation method and a use method thereof, which are basically the same as the example 1, and are different in that hydroxypropyl methyl cellulose ether and modified hydroxypropyl starch ether are not added, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 4
The comparative example provides a machine-spraying putty material, and a preparation method and a use method thereof, which are basically the same as those in example 1, and are different in that a water reducing agent and modified hydroxypropyl starch ether are not added, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of hydroxypropyl methyl cellulose ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the hydroxypropyl methyl cellulose ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 5
The comparative example provides a machine-spraying putty material, and a preparation method and a use method thereof, which are basically the same as those in example 1, and are different in that no water reducing agent and hydroxypropyl methyl cellulose ether are added, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene emulsion powder, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 6
The comparative example provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as those in example 1, and are different only in the addition amount of a water reducing agent, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.03 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 7
The comparative example provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as those in example 1, and are different only in the addition amount of a water reducing agent, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.8 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 8
The comparative example provides a machine-spraying putty material, a preparation method and a using method thereof, which are basically the same as the example 1, and are different only in that the steps of adding different amounts of hydroxypropyl methyl cellulose ether are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.05 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 9
The comparative example provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as the example 1, and are different only in the addition amount of hydroxypropyl methyl cellulose ether, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 1 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 10
The comparative example provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as the example 1, and are different only in the addition amount of modified hydroxypropyl starch ether, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.01 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 11
The comparative example provides a machine-spraying putty material, a preparation method and a use method thereof, which are basically the same as the example 1, and are different only in the addition amount of modified hydroxypropyl starch ether, and the steps are as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.3 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 12
This comparative example provides a machine spray putty material, method of making and method of using the same as example 1, except that the modified hydroxypropyl starch ether having a degree of substitution of 0.06, a viscosity of 800mPa · s was replaced with a starch ether having a degree of substitution of 0.02, a viscosity of 300mPa · s (available from shandong ruihong de chemical), as follows:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Comparative example 13
This comparative example provides a machine-spray putty material, and a method of making and using the same as in example 1, except that hydroxypropyl methyl cellulose ether having a viscosity of 30000 mPa-s was replaced with cellulose ether of 100000 mPa-s (available from Shandong Retita chemical Co., Ltd.) by the steps of:
weighing 16 parts of white cement, 3 parts of vinyl acetate-ethylene emulsion powder, 0.3 part of water reducing agent, 0.3 part of hydroxypropyl methyl cellulose ether, 0.08 part of modified hydroxypropyl starch ether, 0.5 part of defoaming agent, 20 parts of heavy calcium carbonate, 30 parts of kaolin and 30 parts of talcum powder in parts by weight.
The preparation method comprises the following steps: pouring the white cement, the vinyl acetate-ethylene latex powder, the water reducing agent, the hydroxypropyl methyl cellulose ether, the modified hydroxypropyl starch ether, the defoaming agent, the heavy calcium carbonate, the kaolin and the talcum powder into a mixing device, uniformly mixing, weighing and packaging.
The using method comprises the following steps: and weighing 40 parts of water, pouring other powder materials into the water, stirring the mixture at a high speed for 4 minutes, standing the mixture for 10 minutes, and stirring the mixture for 2 minutes.
Testing
The putty materials prepared in the above examples and comparative examples were tested, and the test methods and test results are shown in tables 1-3.
TABLE 1
TABLE 2
TABLE 3
From tables 1 to 3, it can be seen that, when the melamine water reducing agent, the low-viscosity cellulose ether and the modified hydroxypropyl starch ether are added into the putty material together in a proper proportion, the putty material can be endowed with good fluidity and leveling effect, and can not sag within the construction thickness of 2mm, and the bonding strength is also maintained at a high level. After the three raw materials are deleted or replaced, the putty material has poor leveling property or poor sagging resistance. In addition, the addition proportion of the three raw materials also has important influence on the leveling property and the sag resistance of the putty material. In addition, the substitution degree of the modified hydroxypropyl starch ether is reduced, the anti-sagging property is obviously reduced after the viscosity is reduced, and the leveling property is reduced after the viscosity of the cellulose is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The machine-spraying putty material is characterized by comprising the following preparation raw materials in parts by weight:
the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent;
the viscosity of the cellulose ether at 20 ℃ is 20000mPa & s-40000mPa & s;
the substitution degree of the modified hydroxypropyl starch ether is 0.05-0.08, and the viscosity at 20 ℃ is 400-1200 mPa & s;
the filler is selected from the combination of heavy calcium carbonate, kaolin and talcum powder, or the combination of heavy calcium carbonate and kaolin, or the combination of heavy calcium carbonate and talcum powder, or kaolin, or talcum powder, or the combination of kaolin and talcum powder.
2. The machine-spraying putty material as claimed in claim 1, characterized in that the preparation raw materials comprise, by weight:
3. the machine-spray putty material of claim 1 wherein the cellulose ether is selected from hydroxypropyl methyl cellulose ether and/or hydroxyethyl cellulose ether.
4. The machine-spaying putty material of any one of claims 1-3 characterized in that the base material is selected from inorganic base materials and/or organic base materials.
5. The machine-spray putty material of claim 4 characterized in that the inorganic base material is white cement.
6. The machine-sprayed putty material of claim 4 characterized in that the organic base material is polymer latex powder.
7. The machine-sprayed putty material of claim 6 is characterized in that the polymer latex powder is selected from one or more of vinyl acetate, ethylene, vinyl acetate, vinyl ether, vinyl versatate, acrylate, styrene, homopolymers of vinyl and copolymers of vinyl.
8. The machine-sprayed putty material of any one of claims 1 to 3, characterized in that raw materials for preparing the machine-sprayed putty material further comprise a defoaming agent.
9. The machine-sprayed putty material of any one of claims 1 through 3 characterised in that the base materials are white cement and polymer latex powder; the filler is heavy calcium carbonate, kaolin and talcum powder; the preparation raw materials of the machine-spraying putty material also comprise a defoaming agent;
the white cement is 5-30 parts by weight; the weight portion of the polymer latex powder is 0.5 to 5; the weight portion of the water reducing agent is 0.05 to 0.5; the weight portion of the cellulose ether is 0.1 to 0.6; the weight portion of the modified hydroxypropyl starch ether is 0.02-0.2; the weight portion of the heavy calcium carbonate is 0 to 60 portions; the kaolin accounts for 10 to 40 weight parts; 10-40 parts of talcum powder; the weight portion of the defoaming agent is 0.2 to 0.8.
10. A preparation method of a machine-sprayed putty material is characterized by comprising the following steps:
mixing a base material, a water reducing agent, cellulose ether, modified hydroxypropyl starch ether and a filler;
the base material is 0.5 to 35 parts by weight; the weight portion of the water reducing agent is 0.05 to 0.5; the weight portion of the cellulose ether is 0.1 to 0.6; the weight portion of the modified hydroxypropyl starch ether is 0.02-0.2; the weight portion of the filler is 65-90 portions; the water reducing agent is selected from a naphthalene water reducing agent and/or a melamine water reducing agent; the viscosity of the cellulose ether at 20 ℃ is 20000 mPa.4s-40000 mPa.s; the modified hydroxypropyl starch ether has a degree of substitution of 0.05-0.08 and a viscosity of 400-1200 mPa.s at 20 ℃.
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