CN117304680B - Radiation-proof shielding flexible composite material and preparation method and application thereof - Google Patents
Radiation-proof shielding flexible composite material and preparation method and application thereof Download PDFInfo
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Abstract
The application relates to a radiation-proof shielding flexible material, a preparation method and application thereof. A radiation-proof shielding flexible composite material consists of the following raw materials in percentage by weight: 5-10% of natural latex, 20-35% of polyurethane prepolymer, 8-15% of isophorone diisocyanate, 1-5% of styrene-butadiene latex, 0.1-0.3% of vulcanizing agent, 0.1-0.3% of defoaming agent and 40-60% of shielding agent. After the polyurethane prepolymer reacts with isocyanate, the polyurethane prepolymer is blended with natural latex and styrene-butadiene latex and interacts with the natural latex and the styrene-butadiene latex, so that the prepared flexible composite material has better softness and the like, is easy to combine with a shielding agent, and can play a role in reinforcing besides a radiation-proof shielding effect, so that the obtained flexible composite material is used for producing protective clothing, and has better softness, toughness and radiation-proof effect.
Description
Technical Field
The application relates to the field of radiation-proof shielding materials, in particular to a radiation-proof shielding flexible material, a preparation method and application thereof.
Background
With the rapid development of modern technology, a blind and untouched pollution source is increasingly focused on all the fields, namely electromagnetic radiation called invisible killers; in particular, the influence of X-rays and gamma-rays is large, so that corresponding anti-radiation materials are developed for the X-rays and the gamma-rays at home and abroad. However, the materials are mostly added with toxic substances such as lead and the like, which has a certain influence on the environment.
In the related art, environment-friendly tungsten powder and bismuth powder are adopted to fill flexible materials such as rubber and the like to improve the radiation protection effect, but the softness of the flexible materials is reduced due to the addition of a large amount of tungsten powder and bismuth powder, so that the flexible materials are harder and not skin-friendly when the flexible materials are used for producing radiation protection clothing, and the wearing comfort is affected. Further research is required for this purpose.
Disclosure of Invention
In order to obtain a better radiation-proof effect and better softness, the application provides a radiation-proof shielding flexible material, and a preparation method and application thereof.
In a first aspect, the application provides a radiation-proof shielding flexible composite material, which comprises the following raw materials in percentage by weight:
5-10% of natural latex
20-35% Of polyurethane prepolymer
Isophorone diisocyanate 8-15%
1-5% Of styrene-butadiene latex
0.1 To 0.3 percent of vulcanizing agent
0.1 To 0.3 percent of defoaming agent
40-60% Of shielding agent.
The composition and the dosage of the raw materials are all in the preferred range of the application, and the obtained radiation-proof shielding soft composite material has better softness and radiation protection.
The natural latex has high elasticity, good film forming performance during bonding, and the adhesive film has high flexibility. The stable emulsion prepared by polymerizing butadiene and styrene at low temperature has better adhesiveness and dispersibility with a shielding agent, and improves the compatibility of the shielding agent and a composite material raw material system.
The defoaming agent has the defoaming effect, and avoids a large amount of foam generated in the processing process, thereby influencing the structural stability of the product obtained by subsequent processing.
The polyurethane prepolymer is polyether polyurethane prepolymer, and has low cohesive energy of ether bond in the molecule, so that the polyurethane prepolymer is easy to rotate, further has better low-temperature flexibility, excellent hydrolysis resistance, low viscosity of a raw material system, and easy compatibility or blending with isocyanate, natural latex, styrene-butadiene latex, shielding agent and the like, and improves the processing convenience.
After reacting with isocyanate, the mixture is blended with natural latex and styrene-butadiene latex, and the mixture interacts with the natural latex and the styrene-butadiene latex, so that the prepared flexible composite material has better flexibility and the like, is easy to combine with a shielding agent, and can play a role in reinforcing besides a radiation-proof shielding effect, so that the obtained flexible composite material is used for producing protective clothing, and has better flexibility, toughness and radiation-proof effect. Therefore, the protective clothing made of the flexible material has soft hand feeling, improves wearing comfort, and has better radiation protection effect and processability.
Thus, the method is applicable to a variety of applications. Except that it is convenient to produce medical protective clothing and pregnant woman radiation-proof clothing. Meanwhile, thinner sun-proof clothes can be produced, or filaments can be produced, and daily clothes can be produced through tatting and knitting. And then or directly coated in daily clothing to form a soft radiation-proof film, so that the daily clothing also plays a good role in radiation protection.
Preferably, the shielding agent is composed of the following raw materials in parts by weight:
Ammonium persulfate 0.01-0.05 parts
0.05-0.15 Part of anti-settling agent
10-20 Parts of shielding powder
5-10 Parts of silver slurry
5-10 Parts of dispersion liquid.
The dispersion liquid has a good dispersion effect, and can improve the dispersibility of shielding powder in an organic medium, and the silver paste solution is a dispersion liquid containing silver powder and aluminum powder, wherein the particle size of the silver powder is 10-50nm. Silver powder and aluminum powder have the radiation protection effect, the formed silver slurry is easy to be well mixed with the mixed solution of shielding powder and dispersion liquid, and the dispersion liquid is further promoted to be combined with the silver slurry solution under the action of ammonium persulfate, so that the obtained shielding agent is easier to be combined with a raw material system of the flexible composite material, and further, the clothing prepared from the flexible composite material has better softness, toughness and radiation protection effect.
Preferably, the particle size of the shielding powder is 10-200nm.
The nano-level shielding powder is selected, so that the identity of the shielding powder and the dispersion liquid is further improved, and meanwhile, the filling compactness of the shielding powder in the flexible composite material is also improved, and the radiation protection effect is further improved.
Preferably, the shielding powder is composed of the following raw materials in parts by weight:
1-5 parts of nickel-based tungsten carbide powder
3-8 Parts of tungsten carbide
Bismuth oxide 5-10 parts
1-3 Parts of barium sulfate
3-5 Parts of tourmaline powder.
The nickel-based tungsten carbide powder, tungsten carbide, bismuth oxide, barium sulfate and tourmaline powder are all environment-friendly, nontoxic and radiation-proof substances. The nickel-based tungsten carbide powder is powder prepared by nickel and carbide alloy, has synergistic radiation protection effect with tungsten carbide, bismuth oxide, barium sulfate, tourmaline powder and the like, and can further enhance the radiation protection effect of the flexible composite material when the raw materials are compounded. The prepared material has a good radiation protection effect.
The tourmaline powder has the radiation protection effect, can emit infrared rays beneficial to human bodies, and has excellent prevention and auxiliary treatment effects on gastroenteropathy, kidney deficiency and menstrual disorder. Therefore, the protective clothing made of the flexible composite material is beneficial to human body conditioning.
Preferably, the dispersion liquid is composed of the following raw materials in parts by weight:
PVP1-3 parts
3-10 Parts of water
10-20 Parts of absolute ethyl alcohol
0.5-1.5 Parts of N-beta (aminoethyl) -gamma-aminopropyl trimethoxysilane
1-5 Parts of maleic anhydride grafted polypropylene wax emulsion and 1-3 parts of methyl vinyl ether-maleic anhydride copolymer.
Among the above raw materials, the methyl vinyl ether-maleic anhydride copolymer, the maleic anhydride grafted polypropylene wax emulsion, the N-beta (aminoethyl) -gamma-aminopropyl trimethoxy silane and PVP are compounded to play a role in synergy, the film forming property and the adhesiveness are improved, the maleic anhydride grafted polypropylene wax emulsion can also improve the rheological property and the dispersibility of shielding powder, the obtained dispersion liquid can easily disperse the shielding powder under the dilution effect of absolute ethyl alcohol and water, and can be easily and fully mixed with silver paste, and the prepared shielding agent is easily compatible with the raw material system of the flexible composite material under the auxiliary effect of ammonium persulfate and the anti-settling agent, so that the flexible composite material has better softness, toughness and radiation resistance.
Preferably, the silver slurry is composed of the following raw materials in parts by weight:
18-25 parts of nano aluminum powder
1-3 Parts of nano simple substance silver powder
6-10 Parts of EAA emulsion and 2-5 parts of glycidyl methacrylate.
The raw materials are preferably selected in the application, the particle sizes of the nano aluminum powder and the nano elemental silver powder are 80-150nm, and the nano aluminum powder and the nano elemental silver powder have synergistic anti-radiation effect. The EAA emulsion is an environment-friendly organic dispersing agent of a polymer which takes ethylene acrylic acid copolymer as a main body and ethanol as a solvent, nano aluminum powder and nano simple substance silver powder are easy to disperse in the EAA emulsion, and the EAA emulsion has better adhesiveness when being solidified; glycidyl methacrylate contains two functional groups of active vinyl and epoxy with ionic reaction; when the prepared silver slurry is mixed with the dispersing agent and the shielding powder, the synergistic effect is achieved, and under the action of ammonium persulfate, the cross-linked reticular macromolecular composite material is further formed, so that the obtained shielding agent has good compatibility with a raw material system of the flexible composite material, can promote film formation of the shielding agent, and the protective clothing prepared from the flexible composite material has better softness, toughness and radiation resistance.
Preferably, the shielding agent is prepared by the following steps:
1) Weighing nano aluminum powder, nano elemental silver powder, EAA emulsion and glycidyl methacrylate according to parts by weight, and uniformly mixing to obtain silver slurry for later use; weighing PVP, water, absolute ethyl alcohol, N-beta (aminoethyl) -gamma-aminopropyl trimethoxy silane, maleic anhydride grafted polypropylene wax emulsion and methyl vinyl ether-maleic anhydride copolymer, and uniformly mixing to obtain a dispersion liquid for later use; weighing nickel-based tungsten carbide powder, tungsten carbide, bismuth oxide, barium sulfate and tourmaline powder, uniformly mixing, and grinding to obtain shielding powder for later use;
2) Weighing shielding powder according to the weight agent, adding the shielding powder into the dispersion liquid, stirring for 20-30min at the rotating speed of 30-50min, heating to 70-80 ℃, adding ammonium persulfate, stirring uniformly, adding silver slurry and anti-settling agent, and stirring for 1-2h to obtain the shielding agent.
According to the preparation method, the operation is simple, the shielding powder and the shielding metering system are uniformly mixed, silver powder and elemental silver are mixed and uniformly mixed in EAA and glycidyl methacrylate, the formed silver slurry is uniformly mixed with the shielding powder and the dispersion liquid mixed solution, and the two systems are mixed and reacted under the compound effect of ammonium persulfate, so that the prepared shielding agent raw material system is uniformly dispersed and contains cross-linked reticular macromolecular compound, and therefore, when the shielding agent is used for flexible composites, the shielding agent can be uniformly dispersed in the raw material system, and the combination of the shielding powder, the silver powder and the elemental silver powder after film formation and a matrix is good, and the prepared protective clothing has better softness, toughness and radiation protection effect.
Preferably, the natural latex has a solids content of 23-33%; the solid content of the styrene-butadiene latex is 35-45%.
The latex with the solid content range is selected and is easy to be fully and uniformly mixed with the raw material system of the flexible composite material, so that the raw material system of the flexible composite material has better uniformity. Therefore, the obtained protective clothing also has better radiation protection effect, softness and the like.
Preferably, the method comprises the following steps:
Weighing polyurethane prepolymer, isophorone diisocyanate and defoamer according to parts by weight, uniformly mixing, heating to 60-70 ℃, stirring for 30-60min at the rotating speed of 50-80r/min, and regulating the PH value to 6.5-7.5; heating to 75-85deg.C, adding natural latex and styrene-butadiene latex, stirring for 30-60min, adding shielding agent and anti-settling agent, stirring for 1-2 hr, adding vulcanizing agent, and stirring for 10-20min to obtain composite material.
Preferably, the natural latex has a solids content of 23-33%; the solid content of the styrene-butadiene latex is 35-45%.
In a second aspect, the present application provides a radiation-protective, shielding flexible composite comprising the steps of:
Weighing polyurethane prepolymer, isophorone diisocyanate and defoamer according to parts by weight, uniformly mixing, heating to 60-70 ℃, stirring for 30-60min at the rotating speed of 50-80r/min, and regulating the PH value to 6.5-7.5; heating to 75-85deg.C, adding natural latex and styrene-butadiene latex, stirring for 30-60min, adding shielding agent and anti-settling agent, stirring for 1-2 hr, adding vulcanizing agent, and stirring for 10-20min to obtain composite material.
In the process, polyurethane prepolymer and isophorone diisocyanate are mixed to react to obtain polyether polyurethane solution, natural latex and styrene-butadiene latex are added to fully mix the polyether polyurethane solution with the natural latex and the styrene-butadiene latex, and shielding agent and the like are added to further improve the film forming property and flexibility of the cured flexible composite material.
The third aspect is the application of the radiation-proof shielding flexible composite material, which is characterized in that the flexible composite material is coated in a release film, heated to 80-90 ℃, cured for 5-10min, and the release film is peeled off to obtain the shielding film.
The shielding film prepared from the flexible composite material has better flexibility and better toughness and shielding prevention effect.
In summary, the application has the following beneficial effects:
1. After the polyurethane prepolymer reacts with isocyanate, the polyurethane prepolymer is blended with natural latex and styrene-butadiene latex and interacts with the natural latex and the styrene-butadiene latex, so that the prepared flexible composite material has better softness and the like, is easy to combine with a shielding agent, and can play a role in reinforcing besides a radiation-proof shielding effect, so that the obtained flexible composite material is used for producing protective clothing, and has better softness, toughness and radiation-proof effect. Therefore, the protective clothing manufactured by the method has soft hand feeling, improves wearing comfort, and has better radiation protection effect and processability.
2. By adopting the dispersion liquid and the silver slurry, the raw material system of the whole shielding agent is fully and uniformly mixed, and the shielding agent is acted by the anti-settling agent. The method reduces the possibility of sedimentation, and further reacts under the action of ammonium persulfate, so that the raw materials in the whole system are combined more stably, and when the method is used in the flexible composite material, the compatibility is good, the method is combined stably with the raw material system of the flexible composite material after solidification, and the performance of the flexible composite material is further improved.
3. The nickel-based tungsten carbide powder, tungsten carbide, bismuth oxide, barium sulfate and tourmaline powder are compounded to play a good synergistic effect, so that the shielding effectiveness of the flexible composite material is further improved.
4. The methyl vinyl ether-maleic anhydride copolymer, maleic anhydride grafted polypropylene wax emulsion, N-beta (aminoethyl) -gamma-aminopropyl trimethoxy silane and PVP are compounded to play a synergistic role, and under the dilution effect of absolute ethyl alcohol and water, the obtained dispersion liquid is easy to disperse shielding powder, and can be easily and fully mixed with silver paste, and the prepared shielding agent is easy to mix and compatible with a flexible composite material under the auxiliary effect of ammonium persulfate and an anti-settling agent, so that the flexible composite material has better softness, toughness and radiation resistance.
Detailed Description
The present application will be described in further detail with reference to examples.
Sources or parameters of part of the raw materials in the examples:
anti-settling agent, model number of Guangzhou chemical Co., ltd: aqueous polyamide wax S-321;
Polyurethane prepolymer, model polyether TDI, of Wuhan Hua Xiangke biological technology Co., ltd;
Styrene-butadiene latex with solid content 40%, viscosity of 5000CPS at 25 ℃, average molecular weight of butadiene/styrene copolymer 500; PVP viscosity average molecular weight is 10000, K value is 15.25;
The average molecular weight of the methyl vinyl ether maleic anhydride copolymer is 20 ten thousand;
The solid content of the maleic anhydride grafted polypropylene wax emulsion is 40%;
The solid content of the natural latex is 40%;
The vulcanizing agent is two to five;
the defoaming agent is an organosilicon defoaming agent;
The EAA emulsion had a solids content of 55%, an AA content of 27% and a viscosity of 2500CPS at 25 ℃.
Preparation example of screening agent
Preparation example 1
A shielding agent is prepared by the following steps:
1) Weighing 1.8kg of nano aluminum powder, 0.1kg of nano elemental silver powder, 0.6kgEAA kg of emulsion and 0.2kg of glycidyl methacrylate according to parts by weight, and uniformly mixing to obtain silver slurry for later use; weighing 0.1kgPVP, 0.3kg of water, 1kg of absolute ethyl alcohol, 0.05kg of N-beta (aminoethyl) -gamma-aminopropyl trimethoxysilane, 0.1kg of maleic anhydride grafted polypropylene wax emulsion and 0.1kg of methyl vinyl ether-maleic anhydride copolymer, and uniformly mixing to obtain a dispersion liquid for later use; weighing 0.1kg of nickel-based tungsten carbide powder, 0.3kg of tungsten carbide, 1kg of bismuth oxide, 0.3kg of barium sulfate and 0.3kg of tourmaline powder, uniformly mixing, and putting into a grinder for grinding to obtain 50nm shielding powder for later use;
2) Weighing 1kg of shielding powder, adding into 0.5kg of dispersion liquid, transferring to a reaction kettle, stirring for 20min at a rotating speed of 40min, heating to 70 ℃, adding 0.001kg of ammonium persulfate, uniformly stirring, adding 0.5kg of silver slurry and 0.005kg of anti-settling agent, and continuously stirring for 1h to obtain the shielding agent.
PREPARATION EXAMPLES 2 to 5
The preparation examples 2 to 5 differ from the preparation example 1 in that: the amounts of the raw materials used were varied, as shown in Table 1:
TABLE 1 raw material compositions of preparation examples 1-5
Preparation of comparative examples comparative example 1 was prepared
The preparation comparative example 1 is different from the preparation example 1 in that: the silver paste was replaced with an equal amount of shielding powder.
Preparation of comparative example 2
The preparation comparative example 2 is different from the preparation example 1 in that: the dispersion was replaced with an equal amount of silver slurry.
Preparation of comparative example 3
The preparation comparative example 3 is different from the preparation example 1 in that: the shielding powder was replaced with an equal amount of silver paste.
Preparation of comparative example 4
The preparation comparative example 4 is different from the preparation example 1 in that: the shielding powder is tungsten carbide.
Preparation of comparative example 5
The preparation comparative example 5 is different from the preparation example 1 in that: the maleic anhydride grafted polypropylene wax emulsion in the dispersion was replaced equally with methyl vinyl ether-maleic anhydride copolymer.
Preparation of comparative example 6
The preparation comparative example 6 is different from the preparation example 1 in that: the glycidyl methacrylate in the silver paste is equally extracted into EAA emulsion.
Examples
Example 1
The radiation-proof shielding flexible composite material is prepared by the following steps:
Weighing 20% of polyurethane prepolymer, 8% of isophorone diisocyanate and 0.1% of defoamer according to weight percentage, adding into a reaction kettle, uniformly mixing, heating to 70 ℃, stirring for 50min at the rotating speed of 60r/min, adding sodium hydroxide with the mass fraction of 5%, and adjusting the PH value to 7; heating to 80 ℃, adding 10% natural latex and 5% styrene-butadiene latex, continuously stirring for 50min, adding 56.6% shielding agent, continuously stirring for 2h, adding 0.3% vulcanizing agent, and continuously stirring for 20min to obtain the flexible composite material.
Examples 2 to 3
Examples 2-3 differ from example 1 in that: the amounts of the raw materials used are different, and are shown in Table 2;
raw material amount (%)
Examples 4 to 13
Examples 4-13 differ from example 1 in that: the sources of the shielding agents are different, and are shown in table 3;
TABLE 3 Source of screening agent for example 2 and examples 4-7
| Examples | Source of screening agent |
| Example 2 | Preparation example 1 |
| Example 4 | Preparation example 2 |
| Example 5 | Preparation example 3 |
| Example 6 | Preparation example 4 |
| Example 7 | Preparation example 5 |
| Example 8 | Preparation of comparative example 1 |
| Example 9 | Preparation of comparative example 2 |
| Example 10 | Preparation of comparative example 3 |
| Example 11 | Preparation of comparative example 4 |
| Example 12 | Preparation of comparative example 5 |
| Example 13 | Preparation of comparative example 6 |
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that: the natural latex and the styrene-butadiene latex are replaced by the shielding agent in equal quantity.
Comparative example 2
Comparative example 2 is different from example 1 in that: the natural latex and the styrene-butadiene latex are replaced by polyurethane prepolymer in equal quantity.
Comparative example 3
Comparative example 3 is different from example 1 in that: the natural latex is replaced by styrene-butadiene latex in equal amount.
Comparative example 4
Comparative example 4 differs from example 1 in that: the styrene-butadiene latex is replaced by natural latex in equal amount.
Comparative example 5
Comparative example 5 is different from example 1 in that: the shielding agent is bismuth oxide.
Application example
Application example 1
The application of the radiation-proof shielding flexible composite material is that the flexible composite material obtained in the embodiment 1 is coated in a PET release film, heated to 85 ℃, cured for 5min, and the release film is peeled off to obtain a 50-micrometer shielding film.
Application examples 2 to 18
Application examples 2 to 18 differ from application example 1 in that: the sources of the flexible composites were varied and are shown in table 4;
TABLE 4 Flexible composite Source for application examples 1-18
| Application example | Flexible composite source |
| Application example 1 | Example 1 |
| Application example 2 | Example 2 |
| Application example 3 | Example 3 |
| Application example 4 | Example 4 |
| Application example 5 | Example 5 |
| Application example 6 | Example 6 |
| Application example 7 | Example 7 |
| Application example 8 | Example 8 |
| Application example 9 | Example 9 |
| Application example 10 | Example 10 |
| Application example 11 | Example 11 |
| Application example 12 | Example 12 |
| Application example 13 | Example 13 |
| Application example 14 | Comparative example 1 |
| Application example 15 | Comparative example 2 |
| Application example 16 | Comparative example 3 |
| Application example 17 | Comparative example 4 |
| Application example 18 | Comparative example 5 |
Performance test
The shielding films obtained in application examples 1 to 18 were subjected to the following test.
Detection method/test method
1. Shielding effectiveness
Detection is carried out by referring to GB/T35575-2017, and a radiation protection tester is adopted for detection, wherein the frequency is 100GHz, and specific data are shown in table 5.
2. Softness
With reference to method A in the national standard GB/T23129-2009, when the larger the overhang coefficient is, the better the flexibility performance is, the average value is obtained by testing 3 times, the smaller the overhang coefficient is, the better the flexibility is, and the obtained data are shown in Table 5.
3. Tear strength
The test is carried out with reference to GBT 16578.1-2008, and specific data are shown in table 5;
TABLE 5 Experimental data for application examples 1-18
| Application example | Shielding effectiveness (%) | Overhang coefficient (%) | Tear strength (MPa) |
| Application example 1 | 93.25 | 21.11 | 81.23 |
| Application example 2 | 94.49 | 20.12 | 80.19 |
| Application example 3 | 92.19 | 20.87 | 81.14 |
| Application example 4 | 95.62 | 18.28 | 81.28 |
| Application example 5 | 96.28 | 19.08 | 80.89 |
| Application example 6 | 96.03 | 17.85 | 82.02 |
| Application example 7 | 95.74 | 18.02 | 81.28 |
| Application example 8 | 85.23 | 29.25 | 79.65 |
| Application example 9 | 86.65 | 28.23 | 78.25 |
| Application example 10 | 80.32 | 18.89 | 77.59 |
| Application example 11 | 86.29 | 25.26 | 82.89 |
| Application example 12 | 88.65 | 27.89 | 83.28 |
| Application example 13 | 90.39 | 24.25 | 80.36 |
| Application example 14 | 96.89 | 38.58 | 89.62 |
| Application example 15 | 92.58 | 33.28 | 62.89 |
| Application example 16 | 92.02 | 37.38 | 67.89 |
| Application example 17 | 92.98 | 36.89 | 70.28 |
| Application example 18 | 87.59 | 45.58 | 38.95 |
As can be seen from the combination of application examples 1 and application examples 14 to 18 and the combination of Table 5, the shielding effect and tear strength of application example 1 are higher than those of application examples 14 to 18, and the sagging property is lower than that of application examples 14 to 18, which indicates that the shielding film prepared from the flexible composite material prepared from the raw materials of the application has better shielding effect, softness and toughness.
As can be seen from the combination of application examples 1 and application examples 8 to 13 and table 5, application examples 8 to 13 have lower shielding effectiveness than application example 1, which means that the shielding agent obtained by using the raw materials of the present application is used for filling the flexible composite material, and the prepared shielding film has better shielding effect.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (4)
1. The radiation-proof shielding flexible composite material is characterized by comprising the following raw materials in percentage by weight:
5-10% of natural latex
20-35% Of polyurethane prepolymer
Isophorone diisocyanate 8-15%
1-5% Of styrene-butadiene latex
0.1 To 0.3 percent of vulcanizing agent
0.1 To 0.3 percent of defoaming agent
40-60% Of shielding agent;
the shielding agent consists of the following raw materials in parts by weight:
Ammonium persulfate 0.01-0.05 parts
0.05-0.15 Part of anti-settling agent
10-20 Parts of shielding powder
5-10 Parts of silver slurry
5-10 Parts of dispersion liquid;
The particle size of the shielding powder is 10-200nm;
the shielding powder consists of the following raw materials in parts by weight:
1-5 parts of nickel-based tungsten carbide powder
3-8 Parts of tungsten carbide
Bismuth oxide 5-10 parts
1-3 Parts of barium sulfate
3-5 Parts of tourmaline powder;
The dispersion liquid consists of the following raw materials in parts by weight:
PVP1-3 parts
3-10 Parts of water
10-20 Parts of absolute ethyl alcohol
0.5-1.5 Parts of N-beta (aminoethyl) -gamma-aminopropyl trimethoxysilane
1-5 Parts of maleic anhydride grafted polypropylene wax emulsion
1-3 Parts of methyl vinyl ether-maleic anhydride copolymer;
the silver slurry consists of the following raw materials in parts by weight:
18-25 parts of nano aluminum powder
1-3 Parts of nano simple substance silver powder
EAA emulsion 6-10 parts
2-5 Parts of glycidyl methacrylate;
the shielding agent is prepared by the following steps:
1) Weighing nano aluminum powder, nano elemental silver powder, EAA emulsion and glycidyl methacrylate according to parts by weight, and uniformly mixing to obtain silver slurry for later use; weighing PVP, water, absolute ethyl alcohol, N-beta (aminoethyl) -gamma-aminopropyl trimethoxy silane, maleic anhydride grafted polypropylene wax emulsion and methyl vinyl ether-maleic anhydride copolymer, and uniformly mixing to obtain a dispersion liquid for later use; weighing nickel-based tungsten carbide powder, tungsten carbide, bismuth oxide, barium sulfate and tourmaline powder, uniformly mixing, and grinding to obtain shielding powder for later use;
Weighing shielding powder according to the weight agent, adding the shielding powder into the dispersion liquid, stirring for 20-30min at the rotating speed of 30-50r/min, heating to 70-80 ℃, adding ammonium persulfate, uniformly stirring, adding silver slurry and anti-settling agent, and stirring for 1-2h to obtain the shielding agent.
2. A radiation-protective, shielding flexible composite as defined in claim 1, wherein: the solid content of the natural latex is 23-33%; the solid content of the styrene-butadiene latex is 35-45%.
3. A method of preparing the radiation-protective, shielding flexible composite of claim 1 or 2, comprising the steps of:
Weighing polyurethane prepolymer, isophorone diisocyanate and defoamer according to parts by weight, uniformly mixing, heating to 60-70 ℃, stirring for 30-60min at the rotating speed of 50-80r/min, and regulating the PH value to 6.5-7.5; heating to 75-85deg.C, adding natural latex and styrene-butadiene latex, stirring for 30-60min, adding shielding agent, stirring for 1-2 hr, adding vulcanizing agent, and stirring for 10-20min to obtain composite material.
4. The application of the radiation-proof shielding flexible composite material is characterized in that the flexible composite material in claim 1 or 2 is coated in a release film, heated to 80-90 ℃, cured for 5-10min, and the release film is peeled off to obtain the shielding film.
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| CN106009944A (en) * | 2016-06-30 | 2016-10-12 | 中国工程物理研究院材料研究所 | Element gradient combined anti-radiation rubber product and preparation method thereof |
| CN108727538A (en) * | 2018-06-12 | 2018-11-02 | 中国热带农业科学院农产品加工研究所 | A kind of radiation shield modified natural rubber latex and the preparation method and application thereof |
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| DE102004047406A1 (en) * | 2004-09-28 | 2006-03-30 | Basf Ag | Process for the production of flexible polyurethane foams |
| CN115232425B (en) * | 2022-08-09 | 2024-01-30 | 广东思泉新材料股份有限公司 | Low-dielectric high-heat-conductivity shielding dispersion, preparation method thereof and prepared shielding film |
| CN115787289B (en) * | 2022-10-11 | 2023-10-10 | 无锡市圣华盾医疗科技有限公司 | Light nuclear radiation protection fabric and preparation process thereof |
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| CN106009944A (en) * | 2016-06-30 | 2016-10-12 | 中国工程物理研究院材料研究所 | Element gradient combined anti-radiation rubber product and preparation method thereof |
| CN108727538A (en) * | 2018-06-12 | 2018-11-02 | 中国热带农业科学院农产品加工研究所 | A kind of radiation shield modified natural rubber latex and the preparation method and application thereof |
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