Lead-free X-ray shieldingbutadiene styrene rubber composition and preparation method thereof

A technology of styrene-butadiene rubber and composition, which is applied in the field of rare earth oxide/styrene-butadiene rubber composition and its preparation, can solve problems such as easy agglomeration, and achieve good compatibility, excellent shielding performance, and non-polluting structural adaptability Effect

Inactive Publication Date: 2017-02-15
南京英派克检测有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only solves the problem of easy agglomeration of rare earth oxides, but also improves the compatibility of rare earth oxides and styrene-butadiene rubber, ensuring that the rare earth oxide particles can be evenly dispersed in the matrix of styrene-butadiene rubber, and ensuring the X-ray protection Strong shielding and structural adaptability in practical application

Method used

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  • Lead-free X-ray shieldingbutadiene styrene rubber composition and preparation method thereof
  • Lead-free X-ray shieldingbutadiene styrene rubber composition and preparation method thereof
  • Lead-free X-ray shieldingbutadiene styrene rubber composition and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of organic rare earth oxides:

[0036] a. Preparation of grafted styrene-butadiene latex: first add 100 parts of deionized water to the polymerization kettle, then add 100 parts of styrene-butadiene latex SBR1500, 5 parts of sodium dodecylbenzenesulfonate, and 0.5 parts of tertiary dodecyl mercaptan , after replacing with nitrogen, then add 5 parts of MMA, stir and heat, add 0.12 parts of ammonium persulfate when the temperature of the polymerization kettle reaches 40°C, and add 0.1 part of sodium thiocarba after reacting for 3 hours to obtain grafted styrene-butadiene latex SBR1500 (grafting rate 2.3%).

[0037] b preparation of organic rare earth oxides: get 100 parts of rare earth oxides (La 2 o 3 , CeO 2 and Pr 2 o 3 mixture), 5.0 parts of ethylene glycol laurate and 300 parts of deionized water were added to the polymerization kettle, and the pH value of the system was adjusted to 9.5 with sodium hydroxide, and stirred and mixed for 10 minutes;...

Embodiment 2

[0040] (1) Preparation of organic rare earth oxides:

[0041] The preparation of a grafted styrene-butadiene latex: with embodiment 1.

[0042] The preparation of b organic rare earth oxide: with embodiment 1.

[0043] (2) Preparation of rare earth oxide / styrene-butadiene rubber composition: take 100 parts of styrene-butadiene latex SBR1500 (dry rubber), 7 parts of sodium dodecylbenzenesulfonate, and 300 parts of deionized water and add them to the coagulation tank and stir and mix 15 minutes, then add 140 parts of organic rare earth oxides, adjust the pH of the system to 11 with sodium hydroxide, stir and mix for 40 minutes when the temperature rises to 70°C, then add 4 parts of hydrochloric acid for coagulation, and finally wash, dehydrate, dry, press A rare earth oxide / styrene butadiene rubber composition was prepared. Sampling analysis: standard samples were made by vulcanization, and the test performance is shown in Table 1.

Embodiment 3

[0045] (1) Preparation of organic rare earth oxides:

[0046] a Preparation of grafted styrene-butadiene latex: first add 150 parts of deionized water to the polymerization kettle, then add 100 parts of styrene-butadiene latex SBR1500, 7 parts of sodium dodecylbenzenesulfonate, and 0.9 parts of tertiary dodecyl mercaptan , after replacing with nitrogen, then add 9 parts of MMA, stir and heat, add 0.18 parts of ammonium persulfate when the temperature of the polymerization kettle reaches 40 °C, and add 0.3 parts of sodium thiocarbamate after 4 hours of reaction to obtain grafted styrene-butadiene latex SBR1500 (grafting rate 3.5%).

[0047] b preparation of organic rare earth oxides: get 100 parts of rare earth oxides (La 2 o 3 , CeO 2 and Pr 2 o 3 mixture), 7.5 parts of ethylene glycol laurate and 400 parts of deionized water were added to the polymerization kettle, and the pH value of the system was adjusted to 11 with sodium hydroxide, and stirred and mixed for 20 minut...

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Abstract

The invention provides a rare earth oxide/butadiene styrene rubber composition which is mainly prepared from (1) 100 percent of butadiene styrene rubber latex (dry latex) and (2) 120 to 200 percent of an organic rare earth oxide. A preparation method comprises the following steps: esterizing the surfaces of rare earth oxide particles by adopting lauric acid polyol ester under a condition of an alkaline aqueous solution to enable the surfaces to carry ester group and hydroxyl with strong polarity, then performing grafting polymerization on styrene-butadiene latex by adopting an unsaturated acrylate polar monomer, wrapping the surfaces by using grafted styrene-butadiene latex to realize surface organization of the rare earth oxide particles, finally directly mixing the rare earth oxide particles with styrene-butadiene latex without adding any additive, and performing agglomeration, dehydration and drying to prepare the rare earth oxide/butadiene styrene rubber composition. The composition is high in X-ray shielding performance; compared with a conventional lead-containing X-ray shielding material, the rare earth oxide/butadiene styrene rubber composition is light in weight, low in cost, pollution-free and high in structural adaptability in an actual application process. The invention further discloses the preparation method of the composition.

Description

technical field [0001] The invention relates to a lead-free styrene-butadiene rubber composition for shielding X-rays and a preparation method thereof, in particular to a rare earth oxide / styrene-butadiene rubber composition for X-ray protection and a preparation method thereof. Background technique [0002] As we all know, with the continuous development of petrochemical technology, more and more equipment or components need to be tested non-destructively, and radiographic testing is an important part of non-destructive testing. Especially in X-ray detection, workers have to be exposed to X-ray field for a long time, which will cause damage to human gonads, mammary glands, red bone marrow, etc. If the dose exceeds a certain amount, it will also cause diseases such as leukemia and bone tumors. Life is seriously threatened. At present, most of the anti-X-ray materials at home and abroad are rubber plates filled with lead, lead oxide or other lead salts, or lead foils covered...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/08C08K9/10C08K9/04C08K3/22
CPCC08K9/10C08K3/22C08K9/04C08K2003/221
Inventor 节斌
Owner 南京英派克检测有限责任公司
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