CN110256890B

CN110256890B - Primer-free radon-proof interior wall putty powder and preparation method thereof

Info

Publication number: CN110256890B
Application number: CN201910532721.XA
Authority: CN
Inventors: ***; 姚瑞峰; 肖铭
Original assignee: Hebei Chenyang Industry and Trade Group Co Ltd
Current assignee: Hebei Chenyang Industry and Trade Group Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2022-10-28
Anticipated expiration: 2039-06-19
Also published as: CN110256890A

Abstract

The invention discloses primer-free radon-proof interior wall putty powder and a preparation method thereof, belonging to the technical field of coatings and comprising the following components: white cement, silicon dioxide aerogel, active nano calcium carbonate, superfine talcum powder, redispersible latex powder, superfine wood fiber, hydroxypropyl methyl cellulose, a powder defoaming agent, an organic silicon water repellent, tap water, polyacrylamide, polyvinyl alcohol resin, a dispersing agent, a defoaming agent, a bactericide, a film-forming assistant and a high-hydrophobicity waterproof emulsion; the primer-free radon-proof interior wall putty powder can form high-strength and high-compactness putty, has good radiation resistance, and can shield the harm of radon gas in a wall body to a human body for a long time; so that the indoor radon gas concentration is lower than 60Bq m for a long time and accords with the national regulation of GBZ/T155-2002.

Description

Primer-free radon-proof interior wall putty powder and preparation method thereof

Technical Field

The invention relates to the technical field of coatings, in particular to primer-free radon-proof interior wall putty powder and a preparation method thereof.

Background

Radon gas is an inert gas, is colorless and odorless, is a carcinogen recognized internationally, and is one of main pollution gases of indoor environment. Radon gas is one of the main pollutants in indoor air control standards set by countries in the world. The radon pollution problem in the high background area generally exists. In the high background area, radon gas and radon daughter which exceed the standard are often released in the concrete building room, and gamma rays, beta rays, X rays, neutron rays and the like, particularly the radon and the radon daughter enter a human body to be further decayed to release aurin rays and other rays to form internal irradiation. Such long-term low-dose internal irradiation is quite dangerous and thus harmful to the human health in the living room. Therefore, the long-term life is dangerous in the environment with serious radon pollution indoors. To eliminate this potential hazard, people have been looking for a solution to this problem, but have not found a good solution: at present, most national environmental protection departments recommend people to adopt a method of opening doors and windows to enhance air convection so as to dilute the concentration of radon in indoor air; some western countries adopt a method of reducing radon gas in indoor air by installing a vent pipe and forcibly exhausting; special wallpaper is used for blocking to reduce radon gas in indoor air; there have also been reported methods of reducing radon gas in indoor air by using a radon-proof paint; there is also a method of reducing radon gas in indoor air by applying radon-proof mortar to a concrete wall surface. The methods have certain problems in different degrees, such as energy waste caused by opening doors and windows, easiness in damage by mosquitoes and insecurity, energy waste and damage by mosquitoes caused by installing the ventilating pipeline, high installation cost, frequent maintenance and certain indoor space occupation; wallpaper has the problems of high price cost and poor radon prevention effect; the reason why the developed radon-proof paint is difficult to popularize at present is mainly that the cost is high, the radon-proof effect is poor, and the problems of poor environmental protection performance such as TVOC (total volatile organic compounds), formaldehyde, high heavy metal content and the like, poor construction performance, low strength, easy cracking and the like exist; the radon-proof mortar in the patent has a good radon-proof effect, but has the problem of high price and cost, so that the radon-proof mortar is difficult to popularize.

Disclosure of Invention

The invention aims to provide primer-free radon-proof interior wall putty powder and a preparation method thereof, which are used for solving the problems in the prior art, effectively reducing the indoor radon concentration and avoiding the harm of radon to human bodies.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides primer-free radon-proof interior wall putty powder, which comprises powder A and liquid B: :

powder A: 25-30% of white cement, 2-4% of silica aerogel, 40-50% of active nano calcium carbonate, 15-25% of superfine talcum powder, 1.0-1.2% of redispersible latex powder, 0.2-0.3% of superfine wood fiber, 0.3-0.5% of hydroxypropyl methyl cellulose, 0.5-0.6% of powder defoaming agent and 0.3-0.7% of organic silicon water repellent;

the liquid material B comprises the following components in percentage by weight: 43-47% of tap water, 5-8% of polyacrylamide, 10-15% of polyvinyl alcohol resin, 0.3-0.5% of dispersing agent, 0.3-0.5% of defoaming agent, 0.2-0.3% of bactericide, 1.0-1.2% of film-forming assistant and 30-35% of high-hydrophobicity waterproof emulsion.

As a further improvement of the invention, the weight ratio of the powder A to the liquid B is 2.5-5:1.

As a further improvement of the invention, the silicon dioxide aerogel is hydrophobic aerogel powder and can be purchased from Nanhaike congealing chemical company Limited in Foshan city.

As a further improvement of the invention, the nano calcium carbonate is light nano calcium carbonate, the whiteness is more than or equal to 97 percent, and the nano calcium carbonate can be selected as CCR-4 light nano calcium carbonate produced by Qingyuan high peak powder company Limited.

As a further improvement of the invention, the ultrafine talcum powder is 1250-mesh ultrafine talcum powder and is available from Beijing Liguo Weiye ultrafine powder company Limited.

As a further improvement of the invention, the fiber length of the superfine wood fiber is 200um, and the superfine wood fiber with the brand number of B200 produced by the science and technology (Shanghai) of composite new materials can be selected.

As a further improvement of the invention, the polyvinyl alcohol resin has a molecular weight of 72600-81400, and can be selected from 1788, which is a polyvinyl alcohol resin from Shanghai Qiushi Shuo Co.

As a further improvement of the invention, the dispersant is a sodium polycarboxylate dispersant, optionally Rohm and Haas

Dispersant 731A.

As a further improvement of the invention, the white cement is

Grade 52.5 white cement; the redispersible latex powder is WACKER 5010N; the hydroxypropyl methyl cellulose is HPMC100000S of Wake company of Germany; the powder antifoaming agent is AGITANR P803 antifoaming agent of German and Mingling chemical, and the active component is about 65%; the organosilicon hydrophobic agent is hydrophobic powder of an American Dow Corning SHP50 organosilicon hydrophobic agent, and the average particle size of the organosilicon hydrophobic agent is 300um; the polyacrylamide was purchased from sumiko mita chemical ltd; the defoamer is a mineral oil such as nopracec SN1360; the antiseptic bactericide is common cason antiseptic, such as Trojan MERGAL K9N; : the film-forming additive is an alcohol ester twelve-film-forming additive with the chemical name of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate; the high hydrophobic waterproof emulsion is BLJ-6800 emulsion with Baolijia.

The invention also provides a preparation method of the primer-free radon-proof interior wall putty powder, which comprises the following steps:

a. sequentially adding white cement, silicon dioxide aerogel, active nano calcium carbonate, superfine talcum powder, redispersible latex powder, superfine wood fiber, hydroxypropyl methyl cellulose, a powder defoaming agent and an organic silicon water repellent and mixing to prepare powder A;

b. (1) Adding tap water into a material preparation pot or a material preparation cylinder, placing the material preparation pot or the material preparation cylinder under a high-speed dispersion machine, starting the high-speed dispersion machine, uniformly and slowly adding a dispersing agent, a defoaming agent, a bactericide and a film-forming auxiliary agent under stirring at 300-500r/min, and stirring for 5min;

(2) Adding polyacrylamide and polyvinyl alcohol resin under stirring at 600-900r/min, dispersing and stirring at high speed for 30 minutes until the fineness reaches 30um to form uniform paint paste;

(3) And slowly adding the high-hydrophobicity waterproof emulsion at 800-1000r/min, stirring for 5min, and uniformly mixing to prepare a liquid material B.

c. And (3) adding 40 parts of liquid material B into a container, slowly pouring 100-200 parts of powder A into the container, and fully and uniformly stirring by using a putty stirrer to obtain the primer-free radon-proof interior wall putty powder.

As a further improvement of the invention, in the step (2), the high-speed dispersion stirring speed is 1200-1600r/min.

The invention discloses the following technical effects:

1. the powder defoaming agent adopted by the invention can defoam microbubbles generated in the construction process of the primer-free radon-proof interior wall putty powder, so that the primer-free radon-proof interior wall putty powder has excellent durability and shear stability, and simultaneously obtains higher strength and compactness, and improves the radon-proof effect of the interior wall putty;

2. the silicon dioxide aerogel has extremely strong waterproof performance, and can avoid the problem of pulverization caused by later water inflow of primer-free radon-proof interior wall putty powder; after the silicon dioxide aerogel is gelled, silicon molecules can form a chelate film in the putty, so that radon gas is effectively prevented from escaping outwards;

3. the hydrophobic powder of the American Dow Corning SHP50 organosilicon water repellent has the average particle size of 300um, and adopts a high-tech carrier and a slow release technology, so that an active substance can be released in time after meeting water, hydrophobic protection is formed after a base material is cured, the absorption of capillary tubes/pores in the material to water is prevented, the water absorption rate of the base material is greatly reduced, the excellent hydrophobic performance of the material is provided, and the water permeability of the interior wall putty is greatly improved; meanwhile, the organic silicon water repellent and the redispersible rubber powder act synergistically in a certain proportion, so that the compactness of the putty after being cured can be improved, the strength, the water resistance and the radon resistance of the putty are improved, the water absorption capacity of the putty is reduced, and the foaming and falling of the putty are prevented;

4. the high-hydrophobicity waterproof emulsion is selected as a binder, the BLJ-6800 emulsion is formed by adopting a low-soap polymerization technology and adding a special organic silicon monomer into a formula system for polymerization, so that various indexes such as water resistance, alkali resistance, adhesive force and the like of the primer-free radon-proof interior wall putty powder meet the requirements of interior wall primers, and meanwhile, the organic silicon monomer in the emulsion and the silicon dioxide aerogel act synergistically, so that the putty is higher in compactness and better in radon-proof effect.

5. The primer-free radon-proof interior wall putty provided by the invention can obviously reduce the alkalinity of the putty by adding the low-alkali white cement, and improve the compressive strength and water resistance of the putty; the addition of the redispersible rubber powder can increase the cohesiveness of the organic material and the inorganic material, enhance the compatibility of the organic material and the inorganic material, ensure that all components are uniformly and stably dispersed in the slurry, and simultaneously improve the wear resistance and the strength of the putty; adding a certain amount of superfine lignocellulose and hydroxypropyl methyl cellulose as a skeleton structure, so that the slurry has moderate viscosity, the adsorption effect and the adhesion between the slurry and a base layer are enhanced, and the strength after hardening is enhanced; by adding the organosilicon water repellent, the surface and the interior of the putty can be endowed with excellent hydrophobicity, the effect of sealing the interior and the exterior is achieved, the intrusion of moisture is prevented, and the problems of foaming and cracking are avoided.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In other instances, methods, instrumentalities and/or procedures known to those skilled in the art have not been described in detail so as not to obscure the invention. In the present invention, the units indicating the contents of the raw materials are based on parts by weight unless otherwise specified. In addition, the determination methods of the technical indexes of the invention are all standard methods used in the field, and specific reference can be made to the latest national standard unless otherwise stated.

The various auxiliary agents can be any auxiliary agent adopted in the field, can be directly purchased and prepared, and can also be prepared according to a conventional preparation method.

Example 1

The primer-free radon-proof interior wall putty powder comprises the following components in percentage by weight: the weight percentage of the powder A and the liquid B is 100 percent,

powder A: 28% of white cement, 4% of silicon dioxide aerogel, 40% of active nano calcium carbonate, 25% of superfine talcum powder, 1.2% of redispersible latex powder, 0.3% of superfine wood fiber, 0.3% of hydroxypropyl methyl cellulose, 0.5% of powder defoaming agent and 0.7% of organic silicon water repellent;

liquid material B: 43% of tap water, 8% of polyacrylamide, 12% of polyvinyl alcohol resin, 0.3% of dispersing agent, 0.5% of defoaming agent, 0.2% of bactericide, 1.0% of film-forming assistant and 35% of high-hydrophobicity waterproof emulsion;

the preparation method comprises the following steps:

b. (1) Adding tap water into a material preparation pot or a material preparation cylinder, placing the material preparation pot or the material preparation cylinder under a high-speed dispersion machine, starting the high-speed dispersion machine, uniformly and slowly adding a dispersing agent, a defoaming agent, a bactericide and a film-forming auxiliary agent under stirring at 500r/min, and stirring for 5min;

(2) Adding polyacrylamide and polyvinyl alcohol resin under stirring at 600r/min, and dispersing and stirring at high speed of 1600r/min to obtain a uniform paint slurry with fineness of 30um for 30 minutes;

(3) And slowly adding the high-hydrophobicity waterproof emulsion at 800r/min, stirring for 5min, and uniformly mixing to prepare a liquid material B.

c. And (3) adding 40 parts of liquid material B into a container, slowly pouring 100 parts of powder A into the container, and fully and uniformly stirring by using a putty stirrer to obtain the primer-free radon-proof interior wall putty powder.

Example 2

powder A: 25% of white cement, 2% of silicon dioxide aerogel, 50% of active nano calcium carbonate, 20% of superfine talcum powder, 1.0% of redispersible latex powder, 0.3% of superfine wood fiber, 0.5% of hydroxypropyl methyl cellulose, 0.5% of powder defoaming agent and 0.7% of organic silicon water repellent;

liquid material B: 47% of tap water, 6% of polyacrylamide, 10% of polyvinyl alcohol resin, 0.3% of dispersing agent, 0.5% of defoaming agent, 0.2% of bactericide, 1.0% of film-forming assistant and 35% of high-hydrophobicity waterproof emulsion;

the preparation method comprises the following steps:

a. sequentially adding and mixing white cement, silicon dioxide aerogel, active nano calcium carbonate, superfine talcum powder, redispersible latex powder, superfine wood fiber, hydroxypropyl methyl cellulose, a powder defoaming agent and an organic silicon water repellent to prepare powder A;

b. (1) Adding tap water into a material preparation pot or a material preparation cylinder, placing the material preparation pot or the material preparation cylinder under a high-speed dispersion machine, starting the high-speed dispersion machine, uniformly and slowly adding a dispersing agent, a defoaming agent, a bactericide and a film-forming auxiliary agent under stirring at 300r/min, and stirring for 5min;

(2) Adding polyacrylamide and polyvinyl alcohol resin under the stirring of 900r/min, and dispersing and stirring at a high speed of 1200r/min for 30 minutes until the fineness is 30um to form uniform paint paste;

(3) And slowly adding the high-hydrophobicity waterproof emulsion at 1000r/min, stirring for 5min, and uniformly mixing to prepare a liquid material B.

c. And (3) adding 35 parts of liquid material B into a container, slowly pouring 100 parts of powder A into the container, and fully and uniformly stirring by using a putty stirrer to obtain the primer-free radon-proof interior wall putty powder.

Example 3

powder A: 30% of white cement, 2% of silicon dioxide aerogel, 50% of active nano calcium carbonate, 15% of superfine talcum powder, 1.2% of redispersible latex powder, 0.2% of superfine wood fiber, 0.3% of hydroxypropyl methyl cellulose, 0.6% of powder defoaming agent and 0.7% of organic silicon water repellent;

liquid material B: 43% of tap water, 5% of polyacrylamide, 15% of polyvinyl alcohol resin, 0.5% of dispersing agent, 0.3% of defoaming agent, 0.2% of bactericide, 1.0% of film-forming assistant and 35% of high-hydrophobicity waterproof emulsion;

the preparation method comprises the following steps:

b. (1) Adding tap water into a material preparation pot or a material preparation cylinder, placing the material preparation pot or the material preparation cylinder under a high-speed dispersion machine, starting the high-speed dispersion machine, uniformly and slowly adding a dispersing agent, a defoaming agent, a bactericide and a film-forming auxiliary agent under stirring at 400r/min, and stirring for 5min;

(2) Adding polyacrylamide and polyvinyl alcohol resin under the stirring of 800r/min, and dispersing and stirring at a high speed of 1400r/min for 30 minutes until the fineness is 30um to form uniform paint paste;

(3) And slowly adding the high-hydrophobicity waterproof emulsion at 900r/min, stirring for 5min, and uniformly mixing to prepare a liquid material B.

c. And (3) adding 30 parts of liquid material B into a container, slowly pouring 100 parts of powder A into the container, and fully and uniformly stirring by using a putty stirrer to obtain the primer-free radon-proof interior wall putty powder.

Comparative example 1

The raw materials of comparative example 1 were:

20 percent of 42.5-grade white cement, 52.5 percent of active nano calcium carbonate, 25 percent of superfine talcum powder, 0.8 percent of redispersible latex powder, 0.3 percent of superfine wood fiber, 0.2 percent of hydroxypropyl methyl cellulose, 0.5 percent of powder defoaming agent and 0.7 percent of organic silicon water repellent;

the preparation method comprises the following steps:

according to the proportion, 42.5-grade white cement, active nano calcium carbonate, superfine talcum powder, redispersible latex powder, superfine wood fiber, hydroxypropyl methyl cellulose, a powder defoaming agent and an organic silicon water repellent are sequentially added, mixed and stirred uniformly to obtain the interior wall putty powder.

Comparative example 2

The difference from example 1 is that comparative example 2 is the same as example 1 except that no hydrophobic powder of the silicone water repellent of the corning SHP50 in American national Standard is added.

Comparative example 3

The difference from example 1 is that comparative example 3 is the same as example 1 except that no silica aerogel is added.

The primer-free radon-proof interior wall putty powders prepared in the above examples and comparative examples were subjected to performance testing, and the results are shown in table 1.

TABLE 1

Indoor radon concentration detection is carried out on comparative example 2 and comparative example 3 according to GBZ/T155-2002, and the results show that the indoor radon concentration of comparative example 2 is 890Bq m, and the indoor radon concentration of comparative example 3 is 85Bq m, which are higher than the national standard.

The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. The primer-free radon-proof interior wall putty powder is characterized by comprising a powder A and a liquid B:

and (2) liquid material B: 43% of tap water, 8% of polyacrylamide, 12% of polyvinyl alcohol resin, 0.3% of dispersing agent, 0.5% of defoaming agent, 0.2% of bactericide, 1.0% of film-forming assistant and 35% of high-hydrophobicity waterproof emulsion;

the weight ratio of the powder A to the liquid B is 2.5;

the silicon dioxide aerogel is hydrophobic aerogel powder;

the nano calcium carbonate is light nano calcium carbonate, and the whiteness is more than or equal to 97 percent;

the superfine talcum powder is 1250-mesh superfine talcum powder;

the redispersible latex powder is WACKER 5010N;

the length of the superfine wood fiber is 200um;

the organosilicon hydrophobic agent is hydrophobic powder of an American Dow Corning SHP50 organosilicon hydrophobic agent, and the average particle size of the organosilicon hydrophobic agent is 300um;

the molecular weight of the polyvinyl alcohol resin is 72600-81400;

the dispersant is a sodium polycarboxylate dispersant;

the high hydrophobic waterproof emulsion is BLJ-6800 emulsion with Baolijia.

2. The preparation method of the primer-free radon-proof interior wall putty powder as defined in claim 1, characterized by comprising the following steps:

(3) Slowly adding the high-hydrophobicity waterproof emulsion at 800-1000r/min, stirring for 5min, and uniformly mixing to prepare a liquid material B;

3. The preparation method of the primer-free radon-proof interior wall putty powder as claimed in claim 2, wherein in the step (2), the high-speed dispersing and stirring speed is 1200-1600r/min.