CN108727538B - Radiation shielding modified natural latex and preparation method and application thereof - Google Patents
Radiation shielding modified natural latex and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F253/00—Macromolecular compounds obtained by polymerising monomers on to natural rubbers or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/10—Organic substances; Dispersions in organic carriers
- G21F1/103—Dispersions in organic carriers
- G21F1/106—Dispersions in organic carriers metallic dispersions
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
- G21F3/02—Clothing
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
- G21F3/02—Clothing
- G21F3/035—Gloves
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
The invention relates to a preparation method of chemically modified natural latex, in particular to radiation shielding modified natural latex and a preparation method and application thereof. The method comprises the following steps: stabilizing the concentrated natural rubber latex by using a nonionic surfactant, sequentially adding an aqueous dispersion of radiation-proof metal or salt thereof, a mixture of methacrylic acid and long-chain unsaturated fatty acid and water under stirring, and reacting at 65-75 ℃ for 1.5-2.5 h; adding an initiator and an activating agent, and carrying out emulsion graft copolymerization reaction under the non-oxidizing atmosphere, wherein the reaction condition is that the reaction is carried out for 16-30 h at the temperature of 10-30 ℃. The method not only can obviously improve the dispersion degree of metal elements in the natural rubber matrix, but also can improve the shielding effect of the rubber gloves on gamma rays and X-rays.
Description
Technical Field
The invention relates to a preparation method of chemically modified natural latex, in particular to radiation shielding modified natural latex and a preparation method and application thereof.
Background
The radiation shielding rubber gloves are indispensable personal protection products for effectively shielding gamma rays and X-rays and ensuring the physical health of operators in the fields of nuclear industry, national defense, scientific research, energy, modern medicine and the like, and belong to typical military and civil dual-purpose rubber products. The natural rubber has excellent elasticity, mechanical property and radiation degradation resistance (the rubber radiation degradation resistance sequence is that polyurethane, ethylene propylene rubber, styrene butadiene rubber, natural rubber, butadiene rubber, nitrile rubber, chloroprene rubber, silica gel, fluororubber and polysulfide rubber) are adopted), so the natural rubber latex is always an irreplaceable key material for producing the radiation shielding gloves. Until now, the traditional process has been adopted at home and abroad, namely, lead oxide and barium sulfate are respectively physically dispersed in natural latex, and gamma-ray and X-ray shielding gloves are produced by an ion impregnation technology. Because inorganic fillers such as lead oxide, barium sulfate and the like have high density, are easy to settle and incompatible with rubber hydrocarbon, and are difficult to uniformly disperse in natural latex (and glove adhesive films), the shielding effect of the rubber gloves on gamma rays and X-rays is obviously influenced, and metal ions such as lead, barium and the like are easy to migrate to the surfaces of the gloves and finally enter underground water sources to cause serious water pollution.
Therefore, there is a need to provide a natural rubber latex for radiation shielding rubber gloves, which can improve the shielding effect of the rubber gloves on gamma rays and X-rays and inhibit the migration of metal ions to the glove surface.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a chemically modified natural rubber latex for preparing radiation shielding rubber gloves, which has excellent blocking effect on X-rays and gamma rays and has excellent mechanical property and elasticity.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention relates to a preparation method of radiation shielding modified natural latex, which comprises the following steps:
stabilizing the concentrated natural rubber latex by using a nonionic surfactant, sequentially adding an aqueous dispersion of radiation-proof metal or salt thereof, a mixture of methacrylic acid and long-chain unsaturated fatty acid and water under stirring, and reacting at 65-75 ℃ for 1.5-2.5 h; adding an initiator and an activating agent, and carrying out emulsion graft copolymerization reaction under the non-oxidizing atmosphere, wherein the reaction condition is that the reaction is carried out for 16-30 h at the temperature of 10-30 ℃.
The invention adopts natural latex as a base material, so that the rubber gloves have excellent elasticity, mechanical property and radiation resistance; through emulsion graft copolymerization of unsaturated fatty acid salt and natural latex, metal elements such as barium, lead, gadolinium and samarium which have excellent shielding effects on X-rays and gamma rays are organically combined with natural rubber molecular chains, so that the dispersion degree of the metal elements in a rubber matrix is improved, the metal elements are prevented from migrating to the surface of a glove rubber film, and the pollution of metal ions in the glove to underground water sources is eliminated.
To achieve the above objects, the present invention provides a method for stabilizing natural rubber latex with a nonionic surfactant, and an unsaturated fatty acid salt is produced from an aqueous dispersion of a metal or a salt thereof and a mixed fatty acid in the latex by an in situ reaction. Subsequently, the unsaturated fatty acid salt in the redox radical initiating system is used for graft copolymerization with natural latex.
According to one aspect of the invention, the invention also relates to the radiation shielding modified natural rubber latex prepared by the preparation method.
According to one aspect of the present invention, the present invention also relates to a radiation shielding appliance prepared from the radiation shielding modified natural rubber latex as described above.
The modified natural latex prepared by the invention can be prepared into pre-vulcanized latex by adopting a conventional vulcanization system, such as an effective vulcanization system, a semi-effective vulcanization system and the like, and the rubber gloves are produced by adopting alcohol as a coagulant according to a conventional dipping process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the barium, lead and rare earth metal ion methacrylates are all water soluble and in ionized state in natural latex. These high valence metal ions easily destroy the colloidal stability of natural rubber, and the graft copolymerization of unsaturated fatty acid salt and natural rubber molecular chain in latex system cannot be realized. Therefore, the invention adopts methacrylic acid and long-chain unsaturated fatty acid such as oleic acid, linoleic acid, linolenic acid and the like to form mixed unsaturated fatty acid according to a certain proportion, and the mixed unsaturated fatty acid reacts with barium, lead and rare earth metal ions to generate water-insoluble composite unsaturated fatty acid salt, thereby ensuring the colloid stability of natural latex and still maintaining stable milky colloid after the graft copolymerization reaction is finished. According to the invention, barium, lead and rare earth metal ions react with mixed unsaturated fatty acid in situ in natural latex to generate the composite unsaturated fatty acid salt, and further through emulsion graft copolymerization, metal elements such as barium, lead, samarium and gadolinium are organically combined with natural rubber molecular chains, so that the dispersion degree of the metal elements in a natural rubber matrix can be obviously improved, the shielding effect of rubber on gamma rays and X-rays can be improved, the migration of the metal ions to the surface of the rubber can be effectively inhibited, and the pollution of the metal ions to underground water resources is eliminated.
(2) The low-temperature reaction condition is adopted, the homopolymerization reaction rate of the unsaturated fatty acid salt monomer is reduced, and the grafting efficiency is improved. The long-chain unsaturated fatty acid radical in the mixed unsaturated fatty acid salt has larger volume and obvious steric effect, and prevents the graft copolymerization of the methacrylic acid radical and a natural rubber molecular chain. Therefore, the invention adopts lower graft copolymerization reaction temperature (10-30 ℃) to prolong the graft copolymerization reaction time and ensure that the unsaturated fatty acid salt and the natural rubber molecular chain carry out graft copolymerization. Meanwhile, a coupling agent N, N' -methylene bisacrylamide or tetraethylene glycol dimethacrylate can be further adopted in the future to improve the combination between the unsaturated fatty acid salt and the natural rubber molecular chain.
(3) The vulcanized rubber film prepared by the chemically modified natural rubber latex has the tensile strength of 26-29 MPa, the elongation at break of 800-900%, the 300% stress at definite elongation of 3.0-5.0 MPa and the lead equivalent value of more than 0.30mm Pb. The lead content in the impregnation liquid of 5mol/L potassium hydroxide and 5mol/L sulfuric acid solution is less than 3.0 ng/ml.
Detailed Description
The invention relates to a preparation method of radiation shielding modified natural latex, which comprises the following steps:
stabilizing the concentrated natural rubber latex by using a nonionic surfactant, sequentially adding an aqueous dispersion of radiation-proof metal or salt thereof, a mixture of methacrylic acid and long-chain unsaturated fatty acid and water under stirring, and reacting at 65-75 ℃ for 1.5-2.5 h; adding an initiator and an activating agent, and carrying out emulsion graft copolymerization reaction under the non-oxidizing atmosphere, wherein the reaction condition is that the reaction is carried out for 16-30 h at the temperature of 10-30 ℃.
Preferably, in the preparation method as described above, after the water is added, the total solid content of the reaction system is 30 to 35 wt%.
Preferably, in the preparation method, the concentrated natural rubber latex accounts for 100 parts by weight of dry rubber;
10-60 parts by weight of a mixture of methacrylic acid and long-chain unsaturated fatty acid; more preferably 20 to 50 parts by weight, or 30 to 40 parts by weight.
Preferably, the concentrated natural latex is centrifugal concentrated latex from Hevea brasiliensis, and the total solid content is 50-70 wt%; more preferably 60 wt%.
Preferably, in the preparation method, the weight ratio of the methacrylic acid to the long-chain unsaturated fatty acid is (1-3): 1; more preferably 2: 1.
Preferably, the long chain unsaturated fatty acid is selected from one or more of oleic acid, linoleic acid or linolenic acid.
Preferably, in the preparation method as described above, the nonionic surfactant is polyoxyethylene fatty alcohol ether;
preferably, the concentration of the polyoxyethylene fatty alcohol ether is 7wt% -13 wt%, and the addition amount is 10-20 parts by weight;
more preferably, the concentration of the polyoxyethylene fatty alcohol ether is 10 wt%, and the addition amount is 15 parts by weight.
Preferably, the radiation-proof metal comprises lead, barium, gold, silver, copper, iron, tungsten, rare earth;
more preferably, the aqueous dispersion of the salt of the radiation-protective metal is a carbonate of the radiation-protective metal; more preferably, the carbonate is added in an amount of 10 to 50 parts by weight; more preferably 20 to 40 parts by weight; more preferably 30 parts by weight.
Preferably, in the above preparation method, the initiator is cumene hydroperoxide or tert-butyl hydroperoxide, preferably cumene hydroperoxide.
Preferably, in the above-mentioned preparation method, the activator is tetraethylenepentadiamine or ethylenediamine, preferably tetraethylenepentadiamine.
According to one aspect of the invention, the invention also relates to the radiation shielding modified natural rubber latex prepared by the preparation method.
According to one aspect of the present invention, the present invention also relates to a radiation shielding appliance prepared from the radiation shielding modified natural rubber latex as described above;
preferably, the radiation shielding apparatus includes a radiation protective clothing body, a radiation shielding head cover, a radiation shielding glove, and a radiation shielding foot cover.
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
20 parts of a nonionic surfactant aqueous solution with the mass percentage concentration of 10% is added into 100 parts of the concentrated natural latex with the total solid mass percentage of 60% in terms of dry rubber, so that the natural latex is kept stable. Then, 46 parts of barium carbonate aqueous dispersion was sequentially added under stirring, and after stirring for 30 minutes, 120 parts of deionized water and mixed unsaturated fatty acid composed of 21 parts of methacrylic acid and 32 parts of oleic acid were added to control the mass percentage of the total solid content of the reaction system at 30% -35%, and the reaction was carried out at 70 ℃ for 2 hours. After the natural latex is cooled to room temperature, 0.3 part of cumene hydroperoxide and 0.35 part of tetravinyl pentadiamine are sequentially added, and the mixture reacts for 26 hours at the temperature of 20 ℃ under the protection of nitrogen, so that the milky natural rubber-unsaturated fatty acid salt graft copolymer with the unsaturated fatty acid salt grafting rate of about 34 percent by mass is prepared.
1.0 part of sulfur, 0.5 part of zinc oxide and 1.0 part of zinc diethyldithiocarbamate are added into the material, water bath vulcanization is carried out for 1.5 hours at the temperature of 60 ℃, 0.5 part of 2, 6-ditert-butyl-4-methylphenol is added, and the obtained vulcanized rubber film has the tensile strength of 28.2MPa, the elongation at break of 850 percent, the 300 percent stress at definite elongation of 4.2MPa and the lead equivalent value of 0.36 mmPb. The lead content in the impregnation liquid of 5mol/L potassium hydroxide and 5mol/L sulfuric acid solution is 1.1 ng/ml.
Example 2
20 parts of a nonionic surfactant aqueous solution with the mass percentage concentration of 10% is added into 100 parts of the concentrated natural latex with the total solid mass percentage of 60% in terms of dry rubber, so that the natural latex is kept stable. Then, 46 parts of lead carbonate aqueous dispersion was sequentially added under stirring, and after stirring for 30 minutes, a mixed unsaturated fatty acid composed of 30 parts of methacrylic acid and 22 parts of oleic acid and 120 parts of deionized water were added to control the mass percentage of the total solid content of the reaction system at 30% -35%, and the reaction was carried out at 70 ℃ for 2 hours. After the natural latex is cooled to room temperature, 0.3 part of cumene hydroperoxide and 0.35 part of tetravinyl pentadiamine are sequentially added, and the mixture reacts for 20 hours at the temperature of 23 ℃ under the protection of nitrogen, so that the milky natural rubber-unsaturated fatty acid salt graft copolymer with the unsaturated fatty acid salt grafting rate of about 36 percent by mass is prepared.
1.0 part of sulfur, 0.5 part of zinc oxide, 0.5 part of zinc diethyldithiocarbamate and 0.5 part of zinc ethyl-phenyldithiocarbamate are added into the material, the mixture is vulcanized in water bath at 60 ℃ for 1.5 hours, and 0.5 part of 2, 6-di-tert-butyl-4-methylphenol is added, so that the obtained vulcanized rubber film has the tensile strength of 26.8MPa, the tensile elongation of 780%, the 300% stress at definite elongation of 4.8MPa and the lead equivalent value of 0.61 mmPb. The lead content in the impregnation liquid of 5mol/L potassium hydroxide and 5mol/L sulfuric acid solution is 2.7 ng/ml.
Example 3
20 parts of 10% by mass nonionic surfactant aqueous solution was added to 100 parts of 60% by mass total solid mass of the concentrated natural latex based on the dry latex to stabilize the natural latex. Then, 48 parts of gadolinium carbonate aqueous dispersion is added in turn under stirring, after stirring for 30 minutes, mixed unsaturated fatty acid consisting of 30 parts of methacrylic acid and 21 parts of flax and 120 parts of deionized water are added, the mass percentage of the total solid content of the reaction system is controlled between 30 and 35 percent, and the reaction is carried out for 2 hours at 70 ℃. After the natural latex is cooled to room temperature, 0.3 part of cumene hydroperoxide and 0.35 part of tetravinyl pentadiamine are sequentially added, and the reaction is carried out for 25 hours at the temperature of 20 ℃ under the protection of nitrogen, so as to prepare the milky natural rubber-unsaturated fatty acid salt graft copolymer with the unsaturated fatty acid salt grafting rate of 37 percent by mass.
1.0 part of sulfur, 0.5 part of zinc oxide, 0.8 part of zinc diethyldithiocarbamate and 0.2 part of zinc ethyl-phenyldithiocarbamate are added into the material, the mixture is vulcanized in a water bath at 60 ℃ for 1.5 hours, and 0.5 part of 2, 6-di-tert-butyl-4-methylphenol is added, so that the obtained vulcanized rubber film has the tensile strength of 27.6MPa, the elongation at break of 862 percent, the 300 percent stress at definite elongation of 3.8MPa and the lead equivalent value of 0.54 mmPb. The lead content in the impregnation liquid of 5mol/L potassium hydroxide and 5mol/L sulfuric acid solution is 0.6 ng/ml.
Example 4
20 parts of 10% by mass nonionic surfactant aqueous solution was added to 100 parts of 60% by mass total solid mass of the concentrated natural latex based on the dry latex to stabilize the natural latex. Then, 48 parts of samarium carbonate aqueous dispersion are sequentially added under stirring, after stirring for 30 minutes, mixed unsaturated fatty acid consisting of 30 parts of methacrylic acid and 22 parts of linolenic acid and 120 parts of deionized water are added, the mass percentage of the total solid content of the reaction system is controlled to be 30-35%, and the reaction is carried out for 2 hours at 70 ℃. After the natural latex is cooled to room temperature, 0.3 part of cumene hydroperoxide and 0.35 part of tetravinyl pentadiamine are sequentially added, and the mixture reacts for 24 hours at the temperature of 25 ℃ under the protection of nitrogen, so that the milky natural rubber-unsaturated fatty acid salt graft copolymer with the unsaturated fatty acid salt grafting rate of 35 percent by mass is prepared.
1.0 part of sulfur, 0.5 part of zinc oxide, 0.5 part of zinc diethyldithiocarbamate and 0.5 part of zinc ethyl-phenyldithiocarbamate are added into the material, the mixture is vulcanized in a water bath at 60 ℃ for 1.5 hours, and 0.5 part of 2, 6-di-tert-butyl-4-methylphenol is added, so that the obtained vulcanized rubber film has the tensile strength of 28.4MPa, the tensile elongation of 870 percent, the 300 percent stress at definite elongation of 3.7MPa and the lead equivalent value of 0.57 mmPb. The lead content in the impregnation liquid of 5mol/L potassium hydroxide and 5mol/L sulfuric acid solution is 0.4 ng/ml.
Example 5
20 parts of 10% by mass nonionic surfactant aqueous solution was added to 100 parts of 60% by mass total solid mass of the concentrated natural latex based on the dry latex to stabilize the natural latex. Then, 24 parts of lead carbonate aqueous dispersion and 25 parts of gadolinium carbonate aqueous dispersion are added in turn under stirring, after stirring for 30 minutes, mixed unsaturated fatty acid consisting of 32 parts of methacrylic acid and 18 parts of linolenic acid and 120 parts of deionized water are added, the mass percentage of the total solid content of the reaction system is controlled to be 30-35%, and the reaction is carried out for 2 hours at 70 ℃. After the natural latex is cooled to room temperature, 0.3 part of cumene hydroperoxide and 0.35 part of tetravinyl pentadiamine are sequentially added, and the mixture reacts for 26 hours at the temperature of 23 ℃ under the protection of nitrogen, so that the milky natural rubber-unsaturated fatty acid salt graft copolymer with the unsaturated fatty acid salt grafting rate of about 37 percent by mass is prepared.
1.0 part of sulfur, 0.5 part of zinc oxide, 0.7 part of zinc diethyldithiocarbamate and 0.3 part of zinc ethyl-phenyldithiocarbamate are added into the material, the mixture is vulcanized in a water bath at 60 ℃ for 1.5 hours, and 0.5 part of 2, 6-di-tert-butyl-4-methylphenol is added, so that the obtained vulcanized rubber film has the tensile strength of 27.7MPa, the tensile elongation of 830 percent, the 300 percent stress at definite elongation of 3.6MPa and the lead equivalent value of 0.64 mmPb. The lead content in the impregnation liquid of 5mol/L potassium hydroxide and 5mol/L sulfuric acid solution is 1.7 ng/ml.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (16)
1. A preparation method of radiation shielding modified natural rubber latex is characterized by comprising the following steps:
stabilizing the concentrated natural rubber latex by using a nonionic surfactant, sequentially adding an aqueous dispersion of a salt of an anti-radiation metal, a mixture of methacrylic acid and long-chain unsaturated fatty acid and water under stirring, and reacting at 65-75 ℃ for 1.5-2.5 h; adding an initiator and an activator, and carrying out emulsion graft copolymerization reaction under a non-oxidizing atmosphere, wherein the reaction condition is that the reaction is carried out for 16-30 h at the temperature of 10-30 ℃.
2. The method of claim 1, wherein the total solid content of the reaction system after the water is added is 30 wt% to 35 wt%.
3. The method according to claim 1, wherein the concentrated natural rubber latex is 100 parts by weight on a dry rubber basis;
the weight of the mixture of methacrylic acid and long-chain unsaturated fatty acid is 10-60 parts.
4. The method according to claim 1, wherein the concentrated natural latex is a centrifugally concentrated latex derived from Hevea brasiliensis, and has a total solid content of 50 to 70 wt%.
5. The method according to claim 1, wherein the weight ratio of the methacrylic acid to the long-chain unsaturated fatty acid is (1-3): 1.
6. The method of claim 1, wherein the long chain unsaturated fatty acid is selected from one or more of oleic acid, linoleic acid, and linolenic acid.
7. The method of claim 1, wherein the nonionic surfactant is a polyoxyethylene fatty alcohol ether.
8. The preparation method of claim 7, wherein the concentration of the polyoxyethylene fatty alcohol ether is 7wt% to 13 wt%, and the addition amount is 10 to 20 parts by weight.
9. The method according to claim 1, wherein the salt of radiation-proof metal comprises one or more of lead, barium, gold, silver, copper, iron, tungsten and rare earth metal salt.
10. The method of claim 1, wherein the initiator is cumene hydroperoxide or tert-butyl hydroperoxide.
11. The method of claim 1, wherein the initiator is cumene hydroperoxide.
12. The method according to claim 1, wherein the activator is tetraethylenepentadiamine or ethylenediamine.
13. The method according to claim 1, wherein the activator is tetraethylenepentadiamine.
14. The radiation shielding modified natural rubber latex prepared by the preparation method according to any one of claims 1 to 13.
15. A radiation shielding device prepared from the radiation shielding modified natural rubber latex of claim 14.
16. The radiation shielding kit of claim 15, wherein the radiation shielding kit comprises a radiation protective garment body, a radiation shielding headgear, a radiation shielding glove, and a radiation shielding foot cover.
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| CN103554560B (en) * | 2013-10-29 | 2015-09-30 | 中国热带农业科学院农产品加工研究所 | A kind of preparation method of generated in-situ unsaturated fatty acid zinc salt reinforcement natural rubber |
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