CN107353720A - Inhale radon radioresistance coating and its preparation method and application - Google Patents

Abstract

The invention provides a radon-absorbing anti-radiation coating and its preparation method and application, relates to the technical field of coatings, and is mainly prepared from the following raw materials in parts by mass: 5-50 parts of graphene-polyacrylic acid, 90 parts of matrix resin -120 parts, 330-370 parts of deionized water, 450-550 parts of pigments and fillers, the sum of each raw material is 1000 parts; among them, graphene-polyacrylic acid is prepared by urethanization reaction of modified graphene and polyacrylic acid , alleviating the technical problem that the radon released from building materials and building foundation soil is easy to accumulate indoors, resulting in a high content of radioactive radon in the room, which brings great safety hazards to people. And the precipitation of radon in the stratum, and can efficiently absorb radon in the air, thereby effectively improving the living environment, reducing the harm of radon to human health, and providing guaranteed technical effects for people's health.

Description

Radon-absorbing anti-radiation coating and its preparation method and application

technical field

The invention relates to the technical field of coatings, in particular to a radon-absorbing anti-radiation coating and its preparation method and application.

Background technique

Radon is a chemically inactive elemental inert gas, colorless, odorless, and tasteless. It is difficult to chemically react with other elements, but after being inhaled into the human body, it will decay and generate alpha particles, causing radiation damage to the respiratory system and causing lung cancer. . According to the International Cancer Research Center of the World Health Organization, radon is one of the main environmental carcinogens, and its radiation damage to the human body accounts for more than 55% of all radiation damage received by the human body in its lifetime. There are one-fifth of lung cancer patients in the world. Associated with radon gas.

Radon widely exists in people's living environment, especially the radon released from indoor building materials and house foundation soil is very easy to accumulate indoors, resulting in a high content of indoor radon, which brings great safety hazards to people . At present, there is still a lack of relevant research on the prevention and control of indoor radon, and there are few reports on products that reduce indoor radon content.

In view of this, the present invention is proposed.

Contents of the invention

One of the purposes of the present invention is to provide a radon-absorbing anti-radiation coating to relieve the radon released from building materials and building foundation soil from easily accumulating indoors, resulting in a high radon content in the room, which brings great harm to people. Technical issues with major safety hazards.

The radon-absorbing anti-radiation coating provided by the present invention is mainly prepared from the following raw materials in parts by mass: 5-50 parts of graphene-polyacrylic acid, 90-120 parts of matrix resin, 330-370 parts of deionized water, color 450-550 parts of filler, the sum of each raw material is 1000 parts; among them, graphene-polyacrylic acid is prepared by urethanization reaction of modified graphene and polyacrylic acid, and the structure of modified graphene is as follows:

Further, the radon-absorbing anti-radiation coating is mainly prepared from the following raw materials in parts by mass: 8-20 parts of graphene-polyacrylic acid, 100-110 parts of matrix resin, 330-370 parts of deionized water, 450-550 parts of pigments and fillers, the sum of each raw material is 1000 parts.

Further, the modified graphene is prepared by reacting hexamethylene diisocyanate and graphene.

Further, the matrix resin is at least one of styrene-acrylic resin, acetate-acrylic resin, pure acrylic resin, cyclopropylene resin and silicone-acrylic resin.

Further, the raw materials also include 20-40 parts by mass of auxiliary agents, which include dispersants, wetting agents, preservatives, defoamers, leveling agents, antifreeze agents, viscosity modifiers , at least two of a thickener and a film former.

Further, the pigment and filler include at least one of kaolin, heavy calcium, titanium dioxide, talcum powder, barium sulfate and mica powder, preferably a mixture of kaolin, titanium dioxide and heavy calcium, and the mass ratio of the three is 2 :1:7.

Further, the kaolin is calcined kaolin and/or washed kaolin, preferably, the kaolin is a mixture of calcined kaolin and washed kaolin, and the mass ratio of the two is 1:1.

The second object of the present invention is to provide the preparation method of the above-mentioned radon-absorbing anti-radiation coating, so that the radon released in building materials and building foundation soil is easily accumulated indoors, causing the indoor radon content to be very high, which brings people Technical issues that pose a great security risk.

The preparation method of radon-absorbing anti-radiation coating provided by the invention comprises the following steps:

(A) Preparation of modified graphene

Dissolving graphene in N,N-dimethylformamide, adding hexamethylene diisocyanate to react with graphene, centrifuging and washing to remove unreacted hexamethylene diisocyanate, to obtain modified graphene;

(B) Preparation of graphene-polyacrylic acid

Dissolving the modified graphene in N,N-dimethylformamide, adding polyacrylic acid, and continuously stirring, so that the graphene and polyacrylic acid undergoes urethane reaction, that is, the graphene-polyacrylic acid is obtained;

(C) Preparation of radon-absorbing anti-radiation coating

The graphene-polyacrylic acid, matrix resin, pigments and fillers, deionized water and optional additives are evenly mixed to prepare the radon-absorbing radiation-resistant coating.

Further, in step (A), the particle size of the graphene used is 200-500nm.

The third object of the present invention is to provide the application of the above-mentioned radon-absorbing anti-radiation coating, so that the radon released in building materials and building foundation soil is easily accumulated indoors, causing the indoor radon content to be very high, which brings people a lot of troubles. A technical problem with great security risks.

The radon-absorbing anti-radiation paint provided by the invention is used for radon-absorbing anti-radiation in radon-rich spaces.

The radon-absorbing anti-radiation coating provided by the invention can be used in home decoration and special coating fields such as interior walls, basements, subways, etc., and through the mutual cooperation of matrix resin and graphene-polyacrylic acid, it can not only hinder the precipitation of radon in walls and strata , and can efficiently absorb radon in the air, reduce the radon content in the indoor air, thereby effectively improving the living environment, reducing the harm of radon to human health, and providing guarantee for people's health.

The preparation method of the radon-absorbing anti-radiation paint provided by the invention has simple process, convenient operation, can save a lot of manpower and material resources, and satisfies the needs of large-scale industrial production.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Figure 1 is a schematic diagram of the reaction between modified graphene and polyacrylic acid.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

According to one aspect of the present invention, the present invention provides a radon-absorbing anti-radiation coating, which is mainly prepared from the following raw materials in parts by mass: 5-50 parts of graphene-polyacrylic acid, 90-120 parts of matrix resin, 330-370 parts of deionized water, 450-550 parts of pigments and fillers, and the sum of each raw material is 1000 parts; among them, graphene-polyacrylic acid is prepared by urethane reaction of modified graphene and polyacrylic acid, and modified graphite The structure of alkenes is as follows:

The radon-absorbing anti-radiation coating provided by the invention can be used in home decoration and special coating fields such as interior walls, basements, subways, etc., and through the mutual cooperation of matrix resin and graphene-polyacrylic acid, it can not only hinder the precipitation of radon in walls and strata , and can efficiently absorb radon in the air, reduce the radon content in the indoor air, thereby effectively improving the living environment, reducing the harm of radon to human health, and providing guarantee for people's health.

In the present invention, the typical but non-limiting mass parts of graphene-polyacrylic acid are as 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48 or 49 servings.

Typical but non-limiting parts by mass of the matrix resin are, for example, 92, 94, 95, 96, 98, 100, 102, 104, 105, 106, 108, 110, 102, 104, 105, 106, or 108.

Typical but non-limiting parts by mass of deionized water are 332, 334, 335, 336, 338, 340, 342, 344, 345, 346, 348, 350, 352, 354, 355, 356, 358, 360 , 362, 364, 365, 366 or 368.

Typical but non-limiting mass parts of pigments and fillers are 455, 460, 465, 470, 475, 480, 485, 490, 495, 500, 505, 510, 515, 520, 525, 530, 535, 540 or 545.

Fig. 1 is the synoptic diagram that modified graphene reacts with polyacrylic acid, as shown in Fig. 1, graphene-polyacrylic acid is prepared by urethane reaction by modified graphene and polyacrylic acid, as can be seen from Fig. 1, The isocyanate group on the modified graphene reacts with polyacrylic acid to form a multilayer graphene-polyacrylic acid.

In a preferred embodiment of the present invention, the modified graphene is prepared by grafting reaction between hexamethylene diisocyanate and graphene.

In the process of preparing modified graphene, first dissolve graphene in anhydrous N,N-dimethylformamide (DMF), activate graphene with excess hexamethylene diisocyanate (HMDI), and centrifuge Washing removes unreacted HDMI, promptly makes modified graphene, and reaction equation is as follows:

In a preferred embodiment of the present invention, the matrix resin is at least one of styrene-acrylic resin, acetate-acrylic resin, pure acrylic resin and cyclopropylene resin.

By selecting one or more of styrene-acrylic resin, vinegar-acrylic resin, pure acrylic resin, cyclopropyl resin and silicon-acrylic resin as the matrix resin, the matrix resin can cooperate with graphene-polyacrylic acid, so that the prepared The performance of the finished radon-absorbing radiation-resistant coating is better and more stable.

In a preferred embodiment of the present invention, the main raw material also includes 20-40 parts of auxiliary agents in parts by mass, and auxiliary agents include dispersants, wetting agents, preservatives, defoamers, leveling agents, antifreezes, At least two of a viscosity modifier, a thickener and a film former.

It should be noted that, in a preferred embodiment of the present invention, the sum of the matrix resin, graphene-polyacrylic acid, deionized water and additives is 1000 parts.

In a preferred embodiment of the present invention, the antifreezing agent is selected from ethylene glycol and/or propylene glycol; the wetting agent is selected from at least one of PE-100, ethanol, propylene glycol and glycerin; the dispersant is sodium lauryl sulfate, At least one of polyoxyethylene alkylphenyl ether, 2-amino-2methyl-1-propanol, sodium oleate, sodium polyacrylate or polyisobutylene maleic acid sodium salt; the film-forming aid is At least one of ethylene glycol, propylene glycol, hexanediol, propylene glycol butyl ether, ethylene glycol butyl ether, methyl benzyl alcohol or ethylene glycol butyl ether acetate; the defoamer is butanol, 1,2-propylene glycol , octanol, tributyl phosphate, emulsified dimethyl silicone oil, emulsified benzyl silicone oil, polyoxyethylene polyoxypropylene pentaerythritol ether or polyoxyethylene polyoxypropanolamine ether; the preservative is BIT, At least one of MIT or DBNPA; viscosity modifier is AMP-95; thickener is dibutyl phthalate, hydroxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, xanthan gum, XG-60, XG-903, SN-612 or TT-935.

In a preferred embodiment of the present invention, the pigment and filler is at least one of kaolin, heavy calcium, titanium dioxide, talcum powder, barium sulfate and mica powder, preferably a mixture of kaolin, titanium dioxide and heavy calcium, and the three The mass ratio is 2:1:7.

Kaolin is a kind of clay and clay rock mainly composed of high-collar clay minerals. It is white and fine, soft and soft, and has good physical and chemical properties such as plasticity and fire resistance.

Titanium dioxide is a soft, odorless and tasteless white powder with strong hiding power and strong color.

Heavy calcium is heavy calcium carbonate, a colorless, odorless white powder with an average particle size of 1-10 μm.

In a preferred embodiment of the present invention, the pigment and filler are a mixture of kaolin, titanium dioxide and heavy calcium, and when the mass ratio of the three is 2:1:1, the prepared radon-absorbing anti-radiation coating is more beautiful and stronger. high.

In a preferred embodiment of the present invention, the kaolin is calcined kaolin and/or washed kaolin, preferably, the kaolin is a mixture of calcined kaolin and washed kaolin, and the mass ratio of the two is 1:1.

Calcined kaolin is to sinter kaolin in a calcination furnace to a certain temperature and time, so that the combined water content decreases, the content of silica and alumina increases, the active point increases, the structure changes, and the particle size is small and uniform. , can be used as a reinforcing material

Washed kaolin is a kind of kaolin after deep processing. It is only physically treated and does not change the properties of the original soil. Its main function is to improve whiteness and remove impurities.

In a preferred embodiment of the present invention, the kaolin is coordinated with calcined kaolin and washed kaolin, so that it can not only improve the strength of the radon-absorbing radiation-resistant coating, but also improve the whiteness of the radon-absorbing radiation-resistant coating, making it more beautiful.

According to another aspect of the present invention, the present invention provides the preparation method of above-mentioned radon-absorbing anti-radiation coating, comprising the steps of:

(A) Preparation of modified graphene

Dissolving graphene in N,N-dimethylformamide, adding hexamethylene diisocyanate to react with graphene, centrifuging and washing to remove unreacted hexamethylene diisocyanate, to obtain modified graphene;

(B) Preparation of graphene-polyacrylic acid

Dissolving the modified graphene in N,N-dimethylformamide, adding polyacrylic acid, and continuously stirring, so that the graphene and polyacrylic acid undergoes urethane reaction, that is, the graphene-polyacrylic acid is obtained;

(C) Preparation of radon-absorbing anti-radiation coating

The graphene-polyacrylic acid, matrix resin, pigments and fillers, deionized water and optional additives are evenly mixed to prepare the radon-absorbing radiation-resistant coating.

The preparation method of the radon-absorbing anti-radiation paint provided by the invention has simple process, convenient operation, can save a lot of manpower and material resources, and can meet the needs of large-scale industrial production.

In a preferred embodiment of the present invention, in step (a), the graphene used has a diameter of 200-500 nm.

The graphene used in the present invention is prepared by an improved Hummer method: graphite particles are used to prepare graphene with different diameters, and a cellulose acetate membrane is used to filter the graphene solution multiple times to obtain graphene with a particle size of 200-500nm.

In a preferred embodiment of the present invention, in step (B), the molecular weight of the polyacrylic acid used to react with modified graphene is 2.8-3.2kDa, preferably 3kDa, and the reaction time of modified graphene and polyacrylic acid is 6-72 hours, preferably 22-26 hours, more preferably 24 hours.

In a preferred embodiment of the present invention, modified graphene is reacted with excess polyacrylic acid to prepare graphene-polyacrylic acid.

Continuously reacting the modified graphene and polyacrylic acid for more than 6 hours under stirring, so as to make the reaction more complete.

It has been proved by many tests that when the molecular weight of polyacrylic acid is 2.8-3.2kDa, it can not only ensure the reaction with modified graphene, but also ensure the synergistic cooperation between the generated graphene-polyacrylic acid and the matrix resin.

It should be noted that, in a preferred embodiment of the present invention, colorants can also be added to the radon-absorbing anti-radiation coating provided by the present invention, so as to adjust to different colors according to customer needs.

The application of the radon-absorbing anti-radiation paint provided by the invention is used for radon-absorbing anti-radiation in radon-rich spaces, such as basements, subways and indoor spaces of other buildings.

The technical solutions provided by the present invention will be further described below in conjunction with the embodiments.

Example 1

The present embodiment provides a radon-absorbing anti-radiation coating, which is prepared from the following raw materials by mass fraction: 5 parts of graphene-polyacrylic acid, 120 parts of styrene-acrylic resin, 340 parts of deionized water, 500 parts of pigments and fillers, 6.5 parts of thickener, 1 part of viscosity modifier, 8 parts of antifreeze, 4 parts of dispersant, 1 part of wetting agent, 3 parts of defoamer, 1.5 parts of preservative, 10 parts of film-forming aids, of which, pigments and fillers It is a mixture of calcined kaolin, washed kaolin, titanium dioxide and heavy calcium, and the mass ratio of the four is 1:1:1:7; the thickener includes hydroxyethyl cellulose and polyurethane thickener RM-8W, and the two The mass ratio is 11:1; the viscosity regulator is AMP-95; the antifreeze is ethylene glycol; the dispersant is sodium lauryl sulfate; the wetting agent is PE-100; the defoamer is emulsified dimethyl Silicone oil; preservative is BIT; film-forming aid is lauryl alcohol ester.

Example 2

The present embodiment provides a radon-absorbing anti-radiation coating. The difference between the present embodiment and embodiment 1 is that the graphene-polyacrylic acid is 50 parts, the styrene-acrylic resin is 90 parts, and the deionized water is 360 parts. 465 parts of pigments and fillers.

Example 3

This embodiment provides a radon-absorbing anti-radiation coating. The difference between this embodiment and Embodiment 1 is: 8 parts of graphene-polyacrylic acid, 110 parts of styrene-acrylic resin, 350 parts of deionized water, and 350 parts of deionized water. Filling is 497 parts.

Example 4

This embodiment provides a radon-absorbing anti-radiation coating. The difference between this embodiment and Embodiment 1 is: 20 parts of graphene-polyacrylic acid, 100 parts of styrene-acrylic resin, 350 parts of deionized water, and 350 parts of deionized water. Filling is 495 parts.

Example 5

This embodiment provides a radon-absorbing anti-radiation coating. The difference between this embodiment and Embodiment 1 is: Graphene-polyacrylic acid is 10 parts, styrene-acrylic resin is 105 parts, deionized water is 350 parts, and the color The filler is 500 parts.

The preparation method of the radon-absorbing anti-radiation coating provided by above-mentioned embodiment 1-5, carries out according to the following steps:

(A) Preparation of modified graphene

Dissolve graphene with a particle size of 200-500nm in N,N-dimethylformamide, add hexamethylene diisocyanate to react with graphene, and centrifuge to remove unreacted hexamethylene diisocyanate, that is Prepare modified graphene;

(B) Preparation of graphene-polyacrylic acid

Dissolve the modified graphene in N,N-dimethylformamide, add polyacrylic acid with a molecular weight of 3kDa, and continue to stir, so that the graphene and polyacrylic acid undergo urethane reaction to obtain graphene-polyacrylic acid;

(C) Preparation of radon-absorbing anti-radiation coating

First mix the pigments and fillers, deionized water, dispersant, wetting agent, defoamer and viscosity modifier evenly, then add matrix resin, graphene film-forming aid and the remaining film-forming aid, defoamer and Thickener, stir evenly to prepare radon-absorbing anti-radiation coating.

Comparative example 1

This comparative example provides a radon-absorbing anti-radiation coating. The difference between this comparative example and Example 5 is that there are 2 parts of graphene-polyacrylic acid, and 508 parts of pigments and fillers.

Comparative example 2

This comparative example provides a radon-absorbing anti-radiation coating. The difference between this comparative example and Example 5 is that the graphene-polyacrylic acid is 80 parts, and the pigment and filler are 420 parts.

Comparative example 3

This comparative example provides a radon-absorbing anti-radiation coating. The difference between this comparative example and Example 5 is that no graphene-polyacrylic acid is added.

The preparation method of the radon-absorbing anti-radiation coating provided in Comparative Examples 1-3 is the same as that in Example 5, and will not be repeated here.

The radon-absorbing anti-radiation coating provided by the above-mentioned embodiments 1-5 and the radon-absorbing anti-radiation coating provided by Comparative Examples 1-3 were tested for water resistance, scrub resistance, adhesion, storage stability, formaldehyde adsorption rate and radon adsorption rate, and tested The results are shown in the table below:

Table 1 Performance data table of radon-absorbing anti-radiation coating

Note: Water resistance is measured according to GB 5209, scrub resistance is measured according to GB/T 9266, adhesion is measured according to GB/T 1720.

The formaldehyde adsorption rate is measured according to the following method: apply the paint on the glass surface, put it into a formaldehyde adsorption box, and test and track the change of formaldehyde content to observe the adsorption capacity of the paint to formaldehyde. The calculation formula is:

C＝(AA ₀ )×B×V ₁ /(V ₀ ×V ₂ )

In the formula:

C --- formaldehyde concentration in the air, mg/m3;

A --- the absorbance of the sample solution;

A ₀ --- the absorbance of the reagent blank solution;

B---Calculation factor, 4.6751; μg/absorbance value;

V ₀ --- Sampling volume under standard conditions, 7.5L;

V ₁ --- the volume of the absorption liquid when sampling, 5mL;

V ₂ --- The volume of sample taken during analysis, 2mL.

The absorption rate of radon is measured according to the following method: select 8 adjacent basements with a radon content of 180±5Bq/ ^m3 in Wuzhong District, Suzhou, and mark them as No. 1-8 basements respectively, and detect the initial indoor radon content by The radon-absorbing anti-radiation coatings provided by Examples 1-5 and Comparative Examples 1-3 are respectively applied successively to No. 1-8 basements, and after 7 days, detect the radon content of 8 basements successively, by calculating the initial radon content and the radon content after 7 days The ratio of the difference to the initial radon content gives the radon adsorption rate.

By comparing the performance data of Examples 1-5 and Comparative Example 3, it can be seen that when the addition of graphene-polyacrylic acid in the radon-absorbing anti-radiation coating is at 5‰-5%, the prepared radon-absorbing anti-radiation coating Water resistance, scrub resistance, adhesion and storage stability are all excellent, and the adsorption rate to formaldehyde is as high as more than 55%, and the adsorption rate to radon reaches more than 80%, which shows that the radon-absorbing anti-radiation coating provided by the present invention, Through the synergy between styrene-acrylic resin and graphene-polyacrylic acid, it not only has good water resistance, scrub resistance, adhesion and storage stability, but also can hinder the precipitation of radon in walls and formations, and absorb radon in the air , reduce the radon content in the indoor air, and at the same time, it can effectively absorb the formaldehyde in the room, thereby effectively improving the living environment, reducing the harm of radon and formaldehyde to human health, and providing guarantee for people's health.

In contrast to Comparative Examples 1-3, the radon-absorbing anti-radiation coating provided by Comparative Example 1, the addition of graphene-polyacrylic acid is 2‰, although water resistance, scrub resistance, dispersion stability and adhesion are good, but the radon adsorption rate And formaldehyde absorption rate is relatively poor, can't reach the requirement of efficiently improving indoor environment; The radon-absorbing anti-radiation coating that comparative example 2 provides, the addition of graphene-polyacrylic acid is 8%, and its water resistance, scrub resistance, dispersion stability , radon adsorption rate, formaldehyde adsorption rate and adhesion are all better, but the scrub resistance performance drops significantly, unable to meet the use requirements of the coating for multiple scrubbing; comparative example 3 does not add graphene-polyacrylic acid, although its water resistance, resistance Scrubbing performance, dispersion stability and adhesion are all good, but its formaldehyde adsorption rate is low, and it has no adsorption capacity for radon at all, so it cannot protect the human body from radon and formaldehyde.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A radon-absorbing anti-radiation coating is characterized in that it is mainly prepared from the following raw materials in parts by mass: 5-50 parts of graphene-polyacrylic acid, 90-120 parts of matrix resin, 330-50 parts of deionized water 370 parts, 450-550 parts of pigments and fillers, the sum of each raw material is 1000 parts; among them, graphene-polyacrylic acid is prepared by urethane reaction of modified graphene and polyacrylic acid, and the structure of modified graphene is as follows: 2. The radon-absorbing anti-radiation coating according to claim 1 is characterized in that, it is mainly prepared from the following raw materials in parts by mass: 8-20 parts of graphene-polyacrylic acid, 100-110 parts of matrix resin, 330-370 parts of deionized water, 450-550 parts of pigments and fillers, the sum of each raw material is 1000 parts. 3. The radon-absorbing anti-radiation coating according to claim 1 or 2, wherein the modified graphene is prepared by grafting reaction of hexamethylene diisocyanate and graphene. 4. The radon-absorbing anti-radiation coating according to claim 1 or 2, wherein the matrix resin is at least one of styrene-acrylic resin, vinegar-acrylic resin, pure acrylic resin, cyclopropylene resin or silicone-acrylic resin . 5. according to claim 1 and 2 described radon-absorbing anti-radiation coatings, it is characterized in that, described raw material also comprises the auxiliary agent 20-40 parts in parts by mass, and described auxiliary agent comprises dispersant, wetting agent , preservatives, defoamers, leveling agents, antifreeze agents, viscosity regulators, thickeners and film-forming agents at least two. 6. The radon-absorbing anti-radiation coating according to claim 1 or 2, wherein the pigments and fillers include at least one of kaolin, heavy calcium, titanium dioxide, talcum powder, barium sulfate and mica powder, preferably A mixture of kaolin, titanium dioxide and heavy calcium, and the mass ratio of the three is 2:1:7. 7. The radon-absorbing anti-radiation coating according to claim 6, characterized in that, the kaolin is calcined kaolin and/or washed kaolin, preferably, the kaolin is a mixture of calcined kaolin and washed kaolin, and both The mass ratio is 1:1. 8. according to the preparation method of the radon-absorbing anti-radiation coating described in any one of claim 1-7, comprises the steps: (A) Preparation of modified graphene Dissolving graphene in N,N-dimethylformamide, adding hexamethylene diisocyanate to react with graphene, centrifuging and washing to remove unreacted hexamethylene diisocyanate, to obtain modified graphene; (B) Preparation of graphene-polyacrylic acid Dissolving the modified graphene in N,N-dimethylformamide, adding polyacrylic acid, and continuously stirring, so that the graphene and polyacrylic acid undergoes urethane reaction, that is, the graphene-polyacrylic acid is obtained; (C) Preparation of radon-absorbing anti-radiation coating The graphene-polyacrylic acid, matrix resin, pigments and fillers, deionized water and optional additives are evenly mixed to prepare the radon-absorbing radiation-resistant coating. 9. the preparation method of radon-absorbing anti-radiation coating according to claim 8 is characterized in that, in step (A), the particle diameter of the graphene that adopts is 200-500nm. 10. The application of the radon-absorbing anti-radiation coating according to any one of claims 1-7, characterized in that it is used for radon-absorbing anti-radiation in radon-rich spaces.