阅读说明：本技术 一种面层乳胶腻子粉及其制备方法 (Surface layer latex putty powder and preparation method thereof ) 是由 钱平 于 2020-07-07 设计创作，主要内容包括：本申请涉及建筑内墙腻子粉领域,具体涉及一种面层乳胶腻子粉及其制备方法,面层乳胶腻子粉原料中包括滑石粉、灰钙粉、多孔磷酸钙、粘结剂和强化剂,粘结剂中包括纤维素、糊化淀粉、糯米粉、聚乙烯醇和淀粉醚,强化剂中包括乳胶粉、阴离子表面活性剂、碳化硅和氧化锌,其中多孔磷酸钙的制备过程中通过控制制备磷酸钙时的反应物含量和制备条件,以及控制成孔剂的含量和烧结温度等条件,以得到性能更适用于本申请的多孔磷酸钙。此外,使用成本较低的滑石粉作为主要原料,降低腻子粉的成本,同时,滑石粉较现有腻子粉更加细腻,减小腻子表面的粗糙度,使面层腻子粉的收光效果更好,加之各组分配合提高腻子粉的施工性、耐水耐磨和粘结强度。(The application relates to the field of putty powder for interior walls of buildings, in particular to surface layer latex putty powder and a preparation method thereof. In addition, the talcum powder with lower use cost is used as a main raw material, so that the cost of the putty powder is reduced, meanwhile, the talcum powder is finer than the existing putty powder, the roughness of the surface of the putty is reduced, the finishing effect of the surface layer putty powder is better, and the workability, the water resistance, the wear resistance and the bonding strength of the putty powder are improved by matching the components.)

1. A surface layer latex putty powder is characterized in that: comprises the following raw materials in percentage by weight: 75-86 parts of talcum powder, 6-9 parts of sierozem powder, 2-4 parts of porous calcium phosphate, 3-4.5 parts of a binder and 0.5-1.5 parts of an enhancer, wherein the binder comprises cellulose, gelatinized starch, glutinous rice flour, polyvinyl alcohol and starch ether, and the enhancer comprises latex powder, an anionic surfactant, silicon carbide and zinc oxide.

2. The finish latex putty powder of claim 1 further comprising: the enhancer comprises the following raw materials in parts by weight: 15-28 parts of latex powder, 8-13 parts of silicon carbide, 3-7 parts of zinc oxide and 1-1.5 parts of anionic surfactant.

3. The finish latex putty powder of claim 2 further comprising: the reinforcer also comprises a mildew preventive in a weight portion of 0.6-1.3, wherein the mildew preventive comprises one or more of barium metaborate, zinc oxide, sodium pentachlorophenate and alum.

4. The finish latex putty powder of claim 3 further comprising: the anionic surfactant is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate.

5. The finish latex putty powder of claim 1 further comprising: the binder comprises the following raw materials in parts by weight: 60-68 parts of cellulose, 15-18 parts of polyvinyl alcohol, 5-7 parts of gelatinized starch, 5-7 parts of glutinous rice flour and 1-2 parts of starch ether.

6. The finish latex putty powder of claim 1 further comprising: the preparation method of the porous calcium phosphate comprises the following steps:

s1, sieving calcium hydroxide by a 300-mesh sieve, and mixing the calcium hydroxide: adding water into calcium hydroxide powder according to the mass ratio of 1: 2;

s2, dripping phosphoric acid into the solution obtained in the step S1 under the condition of 500 r/min;

s3, adding cellulose accounting for 4 percent of the total weight of the calcium hydroxide and the phosphoric acid;

s4, drying the solution obtained in the step S3 at 130 ℃ until a non-flowing state is formed;

s5, sintering at the temperature of 850 ℃ at most to obtain porous calcium phosphate;

s6, grinding the porous calcium phosphate obtained in the step S3, and sieving the ground porous calcium phosphate with a 300-mesh sieve to obtain porous calcium phosphate powder.

7. The finish latex putty powder of claim 6 further comprising: the molar ratio of phosphoric acid to calcium hydroxide in the step S2 is 2.6: 3.

8. the finish latex putty powder of claim 6 further comprising: the step of sintering to obtain the porous calcium phosphate comprises the following steps:

s301, raising the temperature to 300 ℃;

s302, preserving heat for 1 hour at the temperature of 300 ℃;

s303, heating to 600 ℃ and preserving heat for 1 hour;

and S304, heating to 850 ℃, and then cooling to room temperature.

Technical Field

The application relates to the field of putty powder for interior walls of buildings, in particular to surface layer latex putty powder and a preparation method thereof.

Background

For a long time, the putty is only used as a matching material for base leveling and filling, and the composition of the putty powder only focuses on the coating property and the leveling property, neglects the safety, environmental protection property and water and wear resistance, so that after the putty is coated on a wall, indoor residents crack and fall off or cause discomfort in long-term use. The putty powder mainly comprises bottom putty powder and surface putty powder, wherein the bottom putty powder is used for filling unevenness of a wall surface, and the surface putty powder is mainly used for further filling and surface finishing, so that subsequent wall paint is convenient to develop and fix. The main component of the existing surface layer putty powder is gray calcium or heavy calcium, and the roughness of the putty after blade coating is high. Some construction methods directly use talcum powder, rubber powder and water for blending in order to make surface layer putty more exquisite and reduce roughness, but the rubber powder contains a large amount of formaldehyde, which causes health hazards to indoor residents.

Disclosure of Invention

In order to solve the problems that the roughness of putty powder in the prior art is high, and the safety and environmental protection performance of the putty made of talcum powder is not enough, the application provides the putty powder which has the advantages of fine surface, low cost, safety and environmental protection.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

the surface layer latex putty powder comprises the following raw materials in percentage by weight: 75-86 parts of talcum powder, 6-9 parts of sierozem powder, 2-4 parts of porous calcium phosphate, 3-4.5 parts of a binder and 0.5-1.5 parts of an enhancer, wherein the binder comprises cellulose, gelatinized starch, glutinous rice flour, polyvinyl alcohol and starch ether, and the enhancer comprises latex powder, an anionic surfactant, silicon carbide and zinc oxide.

In the existing putty powder, the putty powder taking the talcum powder as the main raw material needs to be additionally added with glue with high formaldehyde content when in use due to insufficient viscosity and hardness, but the cost of the talcum powder is lower, and the surface of the putty powder taking the talcum powder as the putty powder is smoother and more exquisite, so the putty powder still accounts for a low-end product in the market.

The scheme takes the talcum powder with lower cost as the main raw material, and aims to overcome the problems of insufficient viscosity and hardness and poor construction property of the talcum powder in the prior art, the defect of hardness of the talcum powder can be made up by mixing the sierozem powder in the raw material of the putty powder, and the phenomenon of powder falling can be reduced by increasing the hardness of the putty. Meanwhile, in order to make up for the deficiency of the talc powder in viscosity, a certain amount of binder is added, wherein, unlike glue with high formaldehyde content in the prior art, natural binders such as cellulose, gelatinized starch, glutinous rice flour, polyvinyl alcohol and starch ether are selected to increase the viscosity. Among them, cellulose can be used. The gelatinized starch changes the physical property of the starch to make the starch have cohesive force, and in addition, the water retention property and the viscosity of the putty can be fully increased by matching the gelatinized starch and the cellulose.

It is worth to be noted that the enhancer added in the scheme is a key part in the putty powder in the scheme although the weight percentage is small. The latex powder can improve the adhesive force and mechanical property of the putty, can also improve the water resistance and permeability resistance of the putty, improve the water-retaining property of the putty and increase the opening time. The anionic surfactant can disperse putty powder in water fully, increase the lubricity of the putty and improve the workability of the putty.

The scheme is characterized in that porous calcium phosphate is added, and the pore structure in the porous calcium phosphate can contain components with smaller particle sizes in the putty powder, is similar to sponge, increases the adsorbability and water retention of the putty, and avoids cracks formed by the putty drying too fast; meanwhile, the porous structure enhances the cohesiveness among the components, and further enhances the hardness and the sanding property of the putty.

Further, the enhancer comprises the following raw materials in parts by weight: 15-28 parts of latex powder, 8-13 parts of silicon carbide, 3-7 parts of zinc oxide and 1-1.5 parts of anionic surfactant.

The emulsion powder in the scheme is preferably re-dispersible emulsion powder, when the putty powder is mixed with water before blade coating, the dispersed emulsion powder can be changed into emulsion when meeting water, and when the putty is blade coated, the open time of the putty can be prolonged, the bonding degree of the putty is increased, and the construction property is improved; after the putty is coated on a wall in a scraping way, in the process of gradual drying, the latex powder increases the water retention of the putty powder, so that the putty is dried slowly and prevented from cracking; after drying, the emulsion forms a film, which increases the water resistance and wear resistance of the putty.

The wide particle size distribution of carborundum powder makes the less powder of particle size can fill in the space, intensive mixing between each component, and the cooperation fills the space, and consequently, carborundum has certain influence to the abrasiveness of putty, and in addition, can also increase the smooth finish on putty surface, plays the effect that surface course putty received light.

Further, the reinforcer also comprises a mildew preventive in a weight ratio of 0.6-1.3, wherein the mildew preventive comprises one or more of barium metaborate, zinc oxide, sodium pentachlorophenate and alum. Because the putty powder contains a certain amount of gelatinized starch, glutinous rice flour and starch ether and a micro porous structure of porous calcium phosphate, bacteria and fungi are easily contained, and the putty powder can be effectively prevented from mildewing in the drying process by adding the mildew preventive.

Further, the anionic surfactant is sodium dodecyl benzene sulfonate or sodium dodecyl sulfate.

The anionic surfactant can uniformly disperse the putty powder in water, so that all components are uniformly distributed and combined to prevent deposition, and when the putty is coated by blade coating, the lubricity of the putty is increased, and the putty is easy to construct; on the other hand, the coating uniformity during construction can be improved, and the phenomena of peeling and the like caused by uneven drying can be avoided due to even putty coating.

Further, the binder comprises the following raw materials in parts by weight: 60-68 parts of cellulose, 15-18 parts of polyvinyl alcohol, 5-7 parts of gelatinized starch, 5-7 parts of glutinous rice flour and 1-2 parts of starch ether.

Further, the preparation method of the porous calcium phosphate comprises the following steps:

s1, sieving calcium hydroxide by a 300-mesh sieve, and mixing the calcium hydroxide: adding water into the calcium hydroxide powder according to the mass ratio of 1: 2;

s2, dripping phosphoric acid into the solution obtained in the step S1 under the condition of 500 r/min;

s3, adding cellulose accounting for 4 percent of the total weight of the calcium hydroxide and the phosphoric acid;

s4, drying the solution obtained in the step S3 at 130 ℃ until a non-flowing state is formed;

s5, sintering at the temperature of 850 ℃ at most to obtain porous calcium phosphate;

s6, grinding the porous calcium phosphate obtained in the step S3, and sieving the ground porous calcium phosphate with a 300-mesh sieve to obtain porous calcium phosphate powder.

According to the scheme, the porous calcium phosphate is prepared by using specific steps, so that the porous calcium phosphate is more suitable for putty powder, and specifically, the prepared calcium phosphate is microscopically close to a spherical shape by using a specific dropping speed when phosphoric acid is dropped; the amount of cellulose can determine the number of pores prepared by the porous calcium phosphate, and the sintering temperature determines the capacity of converting the cellulose into effective pores and the quality of the pores.

Further, the molar ratio of phosphoric acid to calcium hydroxide in the step S2 is 2.6: 3.

further, the step of sintering to obtain the porous calcium phosphate comprises:

s301, raising the temperature to 300 ℃;

s302, preserving heat for 1 hour at the temperature of 300 ℃;

s303, heating to 600 ℃ and preserving heat for 1 hour;

and S304, heating to 850 ℃, and then cooling to room temperature.

The beneficial effect of this application is:

(1) the talcum powder with lower cost is used as the main raw material, so that the cost of the putty powder is reduced.

(2) The talcum powder is finer and smoother than the existing putty powder, reduces the roughness of the surface of the putty and enables the light receiving effect of the surface layer putty powder to be better.

(3) Porous calcium phosphate is added in the putty powder, and the porous structure is utilized to contain components with smaller particle sizes in the putty powder, so that the components are similar to sponge, the adsorbability and the water retention of the putty are increased, and cracks are prevented from being formed due to too fast drying of the putty; meanwhile, the porous structure enhances the cohesiveness among the components, and further enhances the hardness and the sanding property of the putty.

(4) Silicon carbide is added in the putty powder, and the components with smaller particle sizes are filled in gaps among the silicon carbide by utilizing the performance of larger particle sizes of the silicon carbide, so that the integrity and the surface finish of the putty are improved.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.