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Rare earth type hydrotalcite composite heat stabilizer and heat-stable polyvinyl chloride

A composite thermal stabilizer and hydrotalcite technology, which is applied in the field of rare earth hydrotalcite composite thermal stabilizers and thermally stable polyvinyl chloride, can solve the problems of general thermal stability of ternary and binary hydrotalcites, and achieve thermal stability Good properties, good synergistic effect, and the effect of improving thermal stability

Active Publication Date: 2015-01-14
HUNAN RARE EARTH METAL MATERIAL RES INST
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Problems solved by technology

[0005] The purpose of the present invention is to provide a rare earth hydrotalcite composite heat stabilizer and thermally stable polyvinyl chloride to solve the general technical problem of the thermal stabilization effect of ternary and binary hydrotalcites

Method used

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  • Rare earth type hydrotalcite composite heat stabilizer and heat-stable polyvinyl chloride
  • Rare earth type hydrotalcite composite heat stabilizer and heat-stable polyvinyl chloride

Examples

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preparation example Construction

[0034] The preparation method of the modified magnesium-zinc-aluminum-cerium hydrotalcite and the modified magnesium-zinc-aluminum-lanthanum hydrotalcite comprises the following steps:

[0035] 1) Divalent magnesium source compound, divalent zinc source compound, trivalent aluminum source compound and trivalent rare earth compound according to M 2+ / M 3+ = 2:1 ~ 4:1 molar ratio dubbed mixed solution, M 3+ The concentration of Zn is 0.2~2.0mol / L, in terms of molar ratio, Zn 2+ / M 2+ = 0.1 ~ 0.8, RE 3+ / M 3+ =0.02~0.8, where RE 3+ for Ce 3+ or La 3+ ,M 3+ Al in the mixed solution 3+ and RE 3+ ,M 2+ Zn in the mixed solution 2+ and Mg 2+ .

[0036] 2) Sodium carbonate and sodium hydroxide are made into an alkaline solution, in which CO 3 2- and M 3+ The molar ratio of NaOH is 0.5 ~ 3, the molar weight of NaOH and M 2+ and M 3+ The ratio of the total molar weight is 0.5-5.

[0037] 3) Add the mixed solution and alkaline solution into deionized water and stir for...

Embodiment 1

[0050] Magnesium zinc aluminum cerium hydrotalcite (molar ratio: M 2+ / M 3+ =2:1, Zn 2+ / M 2+ =0.5, Ce 3+ / M 3+ =0.025, n(CO 3 2- ) / n(M 3+ )=0.50, n(NaOH) / n(M 2+ +M 3+ )=2.5) preparation and modification

[0051] Weigh 4.860g Mg(NO 3 ) 2 ·6H 2 O (0.025moL), 7.437g Zn (NO 3 ) 2 ·6H 2 O (0.025moL), 6.027g Al (NO 3 ) 3 9H 2 O (0.024moL), 0.271g Ce (NO3 ) 3 ·6H 2 O (0.000625moL), add 40mL deionized water after mixing; weigh 1.304gNa 2 CO 3 (0.0123moL) and 7.5gNaOH (0.19moL), after mixing, add 40mL of deionized water; add the above two solutions dropwise to 30mL of deionized water, keep the pH value between 11 and 12, and stir the reaction at 65°C After the dropwise addition, continue to stir for 2 hours, then age at 45° C. for 4 hours, filter, and wash to PH=7 to obtain a magnesium-zinc-aluminum-cerium hydrotalcite filter cake (wet cake moisture content is about 50%). Add water in wet filter cake, water / wet filter cake mass ratio is 20: 1, be warming up to 6...

Embodiment 2

[0053] Magnesium zinc aluminum cerium hydrotalcite (molar ratio: M 2+ / M 3+ =2:1, Zn 2+ / M 2+ =0.5, Ce 3+ / M 3+ =0.05, n(CO 3 2- ) / n(M 3+ )=0.50, n(NaOH) / n(M 2+ +M 3+ )=2.5) preparation and modification

[0054] Weigh 6.160g MgSO 4 ·7H 2 O (0.025moL), 7.189g ZnSO 4 ·7H 2 O (0.025moL), 8.120gAl 2 (SO 4 ) 3 18H 2 O (0.012moL), 0.542g Ce (NO 3 ) 3 ·6H 2 O (0.00125moL), add 40mL deionized water after mixing; weigh 1.335gNa 2 CO 3 (0.0126moL) and 7.5gNaOH (0.19moL), after mixing, add 40mL of deionized water; add the above two solutions dropwise to 30mL of deionized water, keep the pH value between 11 and 12, and stir the reaction at 85°C After the dropwise addition, continue to stir for 2 hours, then age at 65° C. for 20 hours, filter, and wash to PH=7 to obtain a magnesium-zinc-aluminum-cerium hydrotalcite filter cake (the moisture content of the wet filter cake is about 80%). Add water in wet filter cake, water / wet filter cake mass ratio is 50: 1, be warmin...

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Abstract

The invention discloses a rare earth type hydrotalcite composite heat stabilizer and heat-stable polyvinyl chloride. The rare earth type hydrotalcite composite heat stabilizer comprises the following raw materials in percentage by mass: 5-40% of modified Mg-Zn-Al-Ce hydrotalcite, 7-45% of modified Mg-Zn-Al-La hydrotalcite, 1-10% of calcium stearate, 1-10% of calcium oleate, 1-25% of zinc stearate and 1-25% of zinc oleate. The rare earth type hydrotalcite composite heat stabilizer is prepared by kneading and stirring the above raw materials for 20 minutes and is obtained by compounding two raw materials, namely two kinds of four-element rare earth type hydrotalcite which are the modified Mg-Zn-Al-Ce hydrotalcite and the modified Mg-Zn-Al-La hydrotalcite respectively. The rare earth type hydrotalcite composite heat stabilizer disclosed by the invention is good in compatibility with polyvinyl chloride, the synergistic effect of the components is good, and the heat stability of polyvinyl chloride is improved. The heat-stable polyvinyl chloride disclosed by the invention is good in heat stability.

Description

technical field [0001] The invention relates to the field of hydrotalcite composite thermal stabilizers, in particular to a rare earth hydrotalcite composite thermal stabilizer and thermally stable polyvinyl chloride. Background technique [0002] Polyvinyl chloride (PVC) is prone to degradation and crosslinking reactions, resulting in a gradual decline in mechanical properties and chemical resistance. In order to maintain the stability of processing and ensure the quality of products, heat stabilizers must be added during processing to improve the thermal stability of PVC. stable performance. [0003] The research on traditional rare earth hydrotalcite heat stabilizers mostly focuses on the synthesis of binary, ternary and multielement rare earth hydrotalcites and the research on the thermal stability of PVC. Patent application No. 200710027885.4 discloses a magnesium-aluminum rare-earth hydrotalcite synthesized by a hydrothermal method. The patent application number 2009...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K13/06C08K9/04C08K3/26C08K5/12C08K5/098
CPCC08K3/26C08K5/098C08K5/12C08K9/04C08K13/06C08K2003/265C08K2201/014C08L2201/08C08L27/06
Inventor 易师刘荣丽樊玉川王志坚邹龙刘宇晖
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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