Radiation-proof cement plastering mortar and preparation method thereof

Abstract

The invention relates to the technical field of preparation of special building materials. More specifically, the invention relates to a radiation-proof cement plastering mortar and a preparation method thereof, and the radiation-proof cement plastering mortar comprises the following components in parts by weight: 100 parts of radiation-proof cement, 500-1000 parts of heavy radiation-proof medium-fine sand, 0.05-0.8 part of a polymer adhesive, 0.01-0.3 part of a water-retention thickening agent and 0.05-0.1 part of an anti-cracking agent. According to the anti-radiation cement plastering mortar and the preparation method thereof, the anti-radiation cement, the heavy anti-radiation medium-fine sand, the polymer bonding glue, the water-retaining thickening agent and the anti-cracking agent are used for preparing the anti-radiation cement plastering mortar, and the anti-radiation cement plastering mortar can be applied to areas such as wall surfaces, floors and ceilings of nuclear power or medical radioactive source storage or application scenes; the thickness and the weight of a traditional anti-radiation wall body can be reduced to a certain degree, and the anti-radiation cost is reduced. The method has a good application prospect in a radiation hazard risk area.

Description

Technical Field

[0001] The present invention relates to the technical field of special building materials preparation. More specifically, the present invention relates to a radiation-proof cement plaster mortar and a preparation method thereof. Background Art

[0002] Radiation protection in areas with radiation sources such as nuclear power plants and hospitals is an important measure to protect the safety of personnel. Long-term radioactive hazards will pose health risks to personnel engaged in related work. Traditional protection is to irradiate lead plates or ultra-thick steel plates on the surface of the concrete structure in this area, resulting in an overly thick protective wall and a high construction cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a radiation-proof cement plaster mortar and a preparation method thereof. The radiation-proof plaster mortar is prepared by using radiation-proof cement, heavy radiation-proof medium-fine sand, polymer adhesive, water retention thickener, and crack inhibitor, and can be applied to walls, floors, ceilings and other areas in nuclear power or medical radiation source storage or application scenarios, which can reduce the thickness and weight of the traditional radiation-proof wall to a certain extent and reduce the cost of radiation protection. It has good application prospects in areas with radiation hazard risks.

[0004] To achieve these and other advantages in accordance with the present invention, there is provided a radiation-proof cement plaster mortar, comprising the following components in parts by weight:

[0005] 100 parts of radiation-proof cement, 500 - 1000 parts of heavy radiation-proof medium-fine sand, 0.05 - 0.8 parts of polymer adhesive, 0.01 - 0.3 parts of water retention thickener, and 0.05 - 0.1 parts of crack inhibitor.

[0006] Further, in the radiation-proof cement plaster mortar, the radiation-proof cement is barium cement, and the mass content of 3BaO·SiO2 is 30 - 75%.

[0007] Further, in the radiation-proof cement plaster mortar, the radiation-proof cement is boron-barium composite cement, and the mass content of B2O3 is 2 - 8%.

[0008] Further, in the radiation-proof cement plaster mortar, the heavy radiation-proof medium-fine sand is one or any combination of barite medium-fine sand, magnetite medium-fine sand, galena medium-fine sand, and serpentine medium-fine sand.

[0009] Further, in the radiation-proof cement plaster mortar, the mass ratio of medium sand to fine sand in the heavy radiation-proof medium-fine sand is 1:2 - 3.

[0010] Further, in the anti-radiation cement plastering mortar, the polymer adhesive is a copolymer powder of vinyl acetate and ethylene, or a terpolymer powder of vinyl acetate, ethylene and vinyl higher fatty acid ester.

[0011] Further, in the anti-radiation cement plastering mortar, the water retention and thickening agent is a super absorbent polyacrylic resin, or a composite water absorbent material of bentonite and polyacrylic resin.

[0012] Further, in the anti-radiation cement plastering mortar, the crack inhibitor is one or any combination of vinylon fiber, polypropylene fiber, glass fiber and basalt fiber.

[0013] The present invention also provides a preparation method of the above anti-radiation cement plastering mortar, which includes the following steps:

[0014] S1. Mix the anti-radiation cement, heavy anti-radiation medium fine sand, polymer adhesive, water retention and thickening agent and crack inhibitor in the formula parts evenly for standby;

[0015] S2. Then add 10-30 parts by weight of water, and after fully mixing, the anti-radiation cement plastering mortar can be obtained.

[0016] The beneficial effects of the present invention are as follows:

[0017] The present invention uses anti-radiation cement, heavy anti-radiation medium fine sand, polymer adhesive, water retention and thickening agent, and crack inhibitor to prepare anti-radiation plastering mortar, which can be applied to the walls, floors, ceilings and other areas in nuclear power or medical radiation source storage or application scenarios, and can reduce the thickness and weight of traditional anti-radiation walls to a certain extent, reducing the cost of anti-radiation. It has good application prospects in areas with radiation hazard risks.

[0018] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the present invention. Specific Embodiments

[0019] The following further elaborates on the present invention in conjunction with embodiments, so that those skilled in the art can implement it with reference to the text of the specification.

[0020] It should be noted that the experimental methods described in the following implementation examples are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0021] Example 1

[0022] A radiation-proof cement plastering mortar comprises the following components in parts by weight:

[0023] 100 parts of radiation-proof cement, 750 parts of heavy radiation-proof medium-fine sand, 0.5 part of polymer adhesive, 0.2 part of water retention thickener and 0.07 part of crack inhibitor.

[0024] Among them, the radiation-proof cement is boron-barium composite cement, and the mass content of B2O3 is 4%.

[0025] Among them, the heavy radiation-proof medium-fine sand is barite medium-fine sand.

[0026] Among them, the mass ratio of medium sand to fine sand in the heavy radiation-proof medium-fine sand is 1:2.

[0027] Among them, the polymer adhesive is a terpolymer powder of vinyl acetate, ethylene and vinyl higher fatty acid ester.

[0028] Among them, the water retention thickener is super absorbent polyacrylic resin.

[0029] Among them, the crack inhibitor is vinylon fiber.

[0030] The preparation method of the above radiation-proof cement plastering mortar comprises the following steps:

[0031] S1. Mix the radiation-proof cement, heavy radiation-proof medium-fine sand, polymer adhesive, water retention thickener and crack inhibitor in the formula parts evenly for standby;

[0032] S2. Then add 20 parts by weight of water, and after sufficient mixing, the radiation-proof cement plastering mortar can be obtained.

[0033] Example 2

[0034] A radiation-proof cement plastering mortar comprises the following components in parts by weight:

[0035] 100 parts of radiation-proof cement, 750 parts of heavy radiation-proof medium fine sand, 0.5 parts of polymer adhesive, 0.2 parts of water-retaining thickener and 0.07 parts of anti-cracking agent.

[0036] Wherein, the radiation-proof cement is barium cement, in which the mass content of 3BaO·SiO2 is 50%.

[0037] Wherein, the heavy radiation-proof medium fine sand is barite medium fine sand.

[0038] Among them, the mass ratio of medium sand to fine sand in the heavy radiation-proof medium and fine sand is 1:3.

[0039] Wherein, the polymer adhesive is a terpolymer powder of vinyl acetate, ethylene and higher fatty acid vinyl ester.

[0040] Wherein, the water-retaining thickener is a super absorbent polyacrylic acid resin.

[0041] Wherein, the anti-cracking agent is vinylon fiber.

[0042] The preparation method of the radiation-proof cement plaster mortar comprises the following steps:

[0043] S1. Evenly mix the radiation-proof cement, heavy radiation-proof medium-fine sand, polymer adhesive, water-retaining thickener and anti-cracking agent of the formula and set aside;

[0044] S2. Add 20 parts by weight of water and mix thoroughly to obtain the radiation-proof cement plaster mortar.

[0045] Comparative Example 1

[0046] A cement plaster mortar comprises the following components in parts by weight:

[0047] 100 parts of Portland cement, 750 parts of heavy radiation-proof medium fine sand, 0.5 parts of polymer adhesive, 0.2 parts of water-retaining thickener and 0.07 parts of anti-cracking agent.

[0048] Wherein, the heavy radiation-proof medium fine sand is barite medium fine sand.

[0049] Among them, the mass ratio of medium sand to fine sand in the heavy radiation-proof medium and fine sand is 1:3.

[0050] Wherein, the polymer adhesive is a terpolymer powder of vinyl acetate, ethylene and higher fatty acid vinyl ester.

[0051] Wherein, the water-retaining thickener is a super absorbent polyacrylic acid resin.

[0052] Wherein, the anti-cracking agent is vinylon fiber.

[0053] The preparation method of the above radiation - proof cement plastering mortar includes the following steps:

[0054] S1. Mix the silicate cement, heavy - quality radiation - proof medium - fine sand, polymer adhesive, water - retaining thickening agent and crack - resistant agent in the formula proportions evenly and set aside;

[0055] S2. Then add 20 parts by weight of water, and after thorough mixing, the said cement plastering mortar can be obtained.

[0056] Comparative Example 2

[0057] A kind of cement plastering mortar includes the following components in parts by weight:

[0058] 100 parts of silicate cement, 750 parts of medium - fine limestone sand, 0.5 part of polymer adhesive, 0.2 part of water - retaining thickening agent and 0.07 part of crack - resistant agent.

[0059] Among them, the mass ratio of medium - sand to fine - sand in the heavy - quality radiation - proof medium - fine sand is 1:3.

[0060] Among them, the polymer adhesive is a ternary copolymer powder of vinyl acetate, ethylene and vinyl higher fatty acid ester.

[0061] Among them, the water - retaining thickening agent is a super - absorbent polyacrylic acid resin.

[0062] Among them, the crack - resistant agent is vinylon fiber.

[0063] The preparation method of the above radiation - proof cement plastering mortar includes the following steps:

[0064] S1. Mix the silicate cement, heavy - quality radiation - proof medium - fine sand, polymer adhesive, water - retaining thickening agent and crack - resistant agent in the formula proportions evenly and set aside;

[0065] S2. Then add 20 parts by weight of water, and after thorough mixing, the said cement plastering mortar can be obtained.

[0066] Experimental analysis

[0067] In order to further illustrate the radiation - proof effect of the radiation - proof cement plastering mortar of the present invention, Experimental Groups 1 - 5 are set up:

[0068] Experimental Group 1 uses the radiation - proof cement plastering mortar in Example 1, which is applied to the walls, floors, ceilings and other areas in the scenarios of nuclear power plants or medical radioactive source storage or application. The thickness of the radiation - proof cement plastering mortar is 10 mm;

[0069] Experimental Group 2 uses the radiation - proof cement plastering mortar in Example 1, which is applied to the walls, floors, ceilings and other areas in the scenarios of nuclear power plants or medical radioactive source storage or application. The thickness of the radiation - proof cement plastering mortar is 8 mm;

[0070] The test group 3 used the radiation-proof cement plastering mortar in Example 2 and applied it to the walls, floors, ceilings and other areas in the scenarios of nuclear power or medical radiation source storage or application. The thickness of the radiation-proof cement plastering mortar was 10 mm;

[0071] The test group 4 used the cement plastering mortar in Comparative Example 1 and applied it to the walls, floors, ceilings and other areas in the scenarios of nuclear power or medical radiation source storage or application. The thickness of the cement plastering mortar was 10 mm;

[0072] The test group 5 used the cement plastering mortar in Comparative Example 2 and applied it to the walls, floors, ceilings and other areas in the scenarios of nuclear power or medical radiation source storage or application. The thickness of the cement plastering mortar was 10 mm.

[0073] The compressive strength, 2h consistency loss rate, 28d shrinkage rate and neutron shielding rate of the above test groups 1-5 were respectively detected, and the test results are shown in Table 1 below.

[0074] Among them, the detection of the neutron shielding rate used a neutron measurement system to test and analyze the neutron shielding performance of the radiation-proof cement plastering mortar sample. The neutron measurement system used a 252Cf neutron source, which could spontaneously fission. The average neutron energy was 2.13 MeV, T 1 / 2 = 2.65 a, and the neutron emission rate was 1.0×10 6 s -1 , and the BF3 proportional counter used the 10 B(n,α) 7 Li reaction measurement and could be free from the interference of neutron energy change and γ-ray intensity change. The neutron test sample was a spherical shell structure with a cavity diameter of 60 mm and a wall thickness of 10 mm.

[0075] Table 1 Test results of test groups 1-5

[0076] Compressive strength, MPa Consistency loss rate after 2h, % Shrinkage rate after 28d, % Neutron shielding rate, % Test group 1 16.5 25 0.12 20 Test group 2 16.5 25 0.12 15 Test group 3 17.5 26 0.14 10 Test group 4 20.5 26 0.14 6 Test group 5 18.5 27 0.13 3

[0077] From the above data, it can be seen that the neutron shielding rates of the radiation-proof cement plastering mortars in test groups 1-3 are all above 10%, and the average value is 15%. While the neutron shielding rates of the cement plastering mortars in test groups 4 and 5 are all single digits, with an average of only 4.5%. The thicknesses of the mortars in test groups 1 and 3, and test groups 4 and 5 are the same. By comparison, it can be seen that the radiation-proof effect of the radiation-proof cement plastering mortar in test groups 1 and 3 is significantly stronger than that of the cement plastering mortar in test groups 4 and 5. It can be seen that the radiation-proof cement plastering mortar of the present invention has a good radiation-proof effect. In addition, by comparing test groups 1 and 2, it can be seen that when using the same radiation-proof cement plastering mortar, the thicker the radiation-proof cement plastering mortar, the higher the neutron shielding rate and the better the radiation-proof effect.

[0078] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A radiation-proof cement plaster mortar, characterized in that: The composition comprises the following components in parts by weight: 100 parts of radiation-proof cement, 500-1000 parts of heavy radiation-proof medium fine sand, 0.05-0.8 parts of polymer adhesive, 0.01-0.3 parts of water-retaining thickener and 0.05-0.1 parts of anti-cracking agent.

2. The radiation-proof cement plaster mortar according to claim 1, characterized in that: The radiation-proof cement is barium cement, wherein the mass content of 3BaO·SiO2 is 30-75%.

3. The radiation-proof cement plaster mortar according to claim 1, characterized in that: The radiation-proof cement is boron-barium composite cement, in which the mass content of B2O3 is 2-8%.

4. The radiation-proof cement plaster mortar according to claim 1, characterized in that: The heavy radiation-proof medium fine sand is one of the medium fine sand of barite, the medium fine sand of magnetite, the medium fine sand of galena and the medium fine sand of serpentine, or a combination of any several of them.

5. The radiation-proof cement plaster mortar according to claim 4, characterized in that: The mass ratio of medium sand to fine sand in the heavy radiation-proof medium and fine sand is 1:2-3.

6. The radiation-proof cement plaster mortar according to claim 1, characterized in that: The polymer adhesive is a copolymer rubber powder of vinyl acetate and ethylene, or a terpolymer rubber powder of vinyl acetate, ethylene and higher fatty acid vinyl ester.

7. The radiation-proof cement plaster mortar according to claim 1, characterized in that: The water-retaining thickener is a super absorbent polyacrylic acid resin, or a bentonite-polyacrylic acid resin composite absorbent material.

8. The radiation-proof cement plaster mortar according to claim 1, characterized in that: The anti-cracking agent is one of vinylon fiber, polypropylene fiber, glass fiber and basalt fiber, or a combination of any of them.

9. A method for preparing the radiation-proof cement plaster mortar according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Evenly mix the radiation-proof cement, heavy radiation-proof medium-fine sand, polymer adhesive, water-retaining thickener and anti-cracking agent of the formula and set aside; S2. Add 10-30 parts by weight of water and mix thoroughly to obtain the radiation-proof cement plaster mortar.