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Hgdrotalcite base chlorine containing high polymer composite heat stabilizing agent

A composite thermal stabilizer, hydrotalcite-based technology, applied in the field of calcium/zinc compound hydrotalcite-based PVC composite thermal stabilizers, can solve the problem of containing lead

Active Publication Date: 2006-04-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a hydrotalcite-based composite heat stabilizer that does not contain toxic elements in order to overcome the shortcomings of the existing hydrotalcite-based composite heat stabilizer containing toxic elements such as lead and tin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0021] Weigh 48.15g MgSO 4 (0.4mol) and 66.64gAl 2 (SO 4 ) 3 18H 2 O (0.1mol), after mixing, add deionized water to 500ml to prepare Mg 2+ / Al 3+ A mixed salt solution with a molarity of 2; weigh 42.4gNa 2 CO 3 (0.4mol) and 38.4gNaOH (0.96mol) were added to deionized water to 500ml to prepare a mixed alkali solution, and the CO in the alkali solution 3 2- and OH - The molar concentration satisfies n(CO 3 2- ) / n(Al 3+ )=2, n(OH - ) / [n(Mg 2+ )+n(Al 3+ )]=1.6. The above two solutions were quickly mixed in a rotating liquid film reactor, and the slurry obtained after mixing was refluxed and crystallized at 100°C for 6 hours, and the precipitate was washed to pH ≈ 7 to obtain a hydrotalcite filter cake, and about 30 times of the filter cake solid was added content of water, the temperature is raised to 80 DEG C, and stearic acid with a solid content of 5% is added and stirred for 2 hours, and after drying, a surface-modified hydrotalcite powder with a magnesium / alum...

Embodiment 6～8

[0026] Change the composition and proportion of the composite heat stabilizer, add it to 100 parts of PVC according to different dosages, add 50 parts of DOP, then mix and tablet, and carry out static aging test in a heat aging test box at 180±1°C, the results are as follows Table 2 shows:

[0027] Example

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PUM

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Abstract

A hydrotalcite-based composite thermal stabilizer for PVC and chlorine-contained high polymer is prepared from hydrotalcite, calcium soap and zinc soap through proportionally mixing.

Description

Technical field: [0001] The invention relates to a hydrotalcite-based composite thermal stabilizer, in particular to a calcium / zinc compound hydrotalcite-based PVC composite thermal stabilizer. Background technique: [0002] PVC resin has the characteristics of incombustibility, high mechanical properties, low price, rich sources of raw materials, mature manufacturing process, etc. Large class of general purpose thermoplastics. However, the thermal stability of PVC itself is very poor. Its flow temperature is 136°C and its decomposition temperature is 140°C. The difference between the two is only 4°C, which brings great difficulties to processing and use. Therefore, a certain amount of heat stabilizer must be added. Other chlorine-containing high polymers will also undergo autocatalytic reactions of HCl removal under heat or ultraviolet irradiation, which will reduce the various properties of the material. Heat stabilizer is one of the indispensable main additives in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/098C08L27/06C08K3/26C08L27/04
CPCC08K5/098
Inventor 段雪李殿卿林彦军
Owner BEIJING UNIV OF CHEM TECH
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