Zinc-aluminium terres rares hydrotalcite compound heat stabilizer for polyvinyl chloride (PVC) as well as preparation and application of compound heat stabilizer

A composite heat stabilizer and magnesium aluminum hydrotalcite technology, which is applied in the field of material science application technology development, can solve the problems of large rare earth ion radii and difficulty entering the hydrotalcite laminate, and achieve improved thermal stability, excellent thermal stability, The effect of enhancing thermal stability

Inactive Publication Date: 2011-06-15
CENT SOUTH UNIV
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Problems solved by technology

[0014] It can be seen from the above documents that the difficulty in preparing rare earth carbonate-containing hydrotalcites used as heat stabilizers is that the rare earth ions have a large radius and are difficult to enter the hydrotalcite laminates; and in the co-precipitation process, sodium carbonate and sodium hydroxide are used The mixed solution is used as a precipitant, which is easy to produce RE 2 CO 5 and RE 2 (CO 3 ) 2 (OH) 2 Miscellaneous

Method used

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  • Zinc-aluminium terres rares hydrotalcite compound heat stabilizer for polyvinyl chloride (PVC) as well as preparation and application of compound heat stabilizer

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Effect test

Embodiment 1

[0039] Zinc-aluminum-lanthanum hydrotalcite (molar ratio: M 2+ / M 3+ =2:1, La 3+ / Al 3+ =0.1) preparation and surface modification

[0040] Weigh 29.75g Zn(NO 3 ) 2 ·6H 2 O (0.1mol), 17.07gAl (NO 3 ) 3 9H 2 O (0.0455mol), 1.97gLa (NO 3 ) 3 ·6H 2 O (0.00455mol), add deionized water to prepare a 100mL mixed solution, weigh 12.00g NaOH (0.3mol), add deionized water to prepare a 100mL solution, and mix the above two solutions at a water bath temperature of 40°C under strong stirring conditions Add dropwise to 100mL deionized water at the same time, control the pH value to 8±0.2, continue to stir for 1h after the dropwise addition, raise the temperature to 80°C and age for 24 hours, add 2.65g of anhydrous sodium carbonate, and stir at 80°C for 2 hours , filtered and washed to obtain a zinc-aluminum-lanthanum hydrotalcite filter cake. Add deionized water to the filter cake, the mass ratio of water / filter cake is 5: 1, then add sodium stearate accounting for 1.25% of the...

Embodiment 2

[0042] According to the method of embodiment 1, the molar ratio obtained is M 2+ / M 3+ =2:1, Ce 3+ / Al 3+ = 0.025 zinc aluminum cerium hydrotalcite.

Embodiment 3

[0044] According to the method of embodiment 1, the molar ratio obtained is M 2+ / M 3+ = 3:1, La 3+ / Al 3+ = 0.05 zinc aluminum lanthanum hydrotalcite.

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Abstract

The invention relates to a zinc-aluminium terres rares hydrotalcite compound heat stabilizer for polyvinyl chloride (PVC) as well as preparation and application of the compound heat stabilizer. The compound heat stabilizer is obtained by optimally complexing zinc-aluminium terres rares hydrotalcite and magnalium hydrotalcite in a certain proportion. After surface modification by sodium stearate, the zinc-aluminium terres rares hydrotalcite and magnalium hydrotalcite have good compatability with the PVC. In the compound heat stabilizer, the synergistic effect between two hydrotalcites and the synergistic effect between zinc and rare-earth elements in the zinc-aluminium terres rares hydrotalcite are utilized, and the excellent property of the rare-earth element is also utilized, thereby greatly improving the heat stability of the PVC. The zinc-aluminium terres rares hydrotalcite compound heat stabilizer has the advantages of no toxicity, high efficiency, simple preparation process and low price; and the dosage of an additive in the course of processing does not influence the property of the product. The static thermal degradation test result indicates that the heat stabilizing time (blackening time of a sample) of the optimally complexed heat stabilizer for the PVC is 210 minutes.

Description

technical field [0001] The invention belongs to the field of material science application technology development, and relates to a zinc-aluminum rare earth hydrotalcite composite heat stabilizer for PVC, and also relates to its preparation and application. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose plastics in the world. The promotion and application of PVC chemical building materials have enabled the rapid development of PVC. Although PVC has the advantages of good wear resistance, high dielectric and low price, its thermal stability is poor, and the general processing temperature is higher than the decomposition temperature. Therefore, heat stabilizers must be added to PVC to prevent or slow down its thermal degradation during thermal processing and use. [0003] Traditional PVC heat stabilizers such as lead-based and cadmium-based heat stabilizers will be phased out due to their toxicity. Organotins have high cost and are n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/04C08K3/26C08K5/12
Inventor 周建良朱健黄怀忠孙玉莲
Owner CENT SOUTH UNIV
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