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Mg-Ca-Zn-Al four-component hydrotalcite heat stabilizer

A heat stabilizer and hydrotalcite technology, applied in fibrous fillers, inorganic pigment treatment, chemical instruments and methods, etc., can solve the problems of rising raw material and power costs, increasing production costs, and prolonging the production process to achieve low cost, Improved thermal stability and less investment

Inactive Publication Date: 2010-10-13
TIANJIN HAOHUA CHEM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will inevitably prolong the production process, complicate the process, increase construction investment, and greatly increase the cost of raw materials and power.
Organic unsaturated acids such as ethylene glycol and maleic acid are poisonous, which will cause a series of problems in environmental protection, labor protection, etc., all of which will eventually lead to an increase in production costs

Method used

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  • Mg-Ca-Zn-Al four-component hydrotalcite heat stabilizer
  • Mg-Ca-Zn-Al four-component hydrotalcite heat stabilizer
  • Mg-Ca-Zn-Al four-component hydrotalcite heat stabilizer

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preparation example Construction

[0038] The preparation method of above-mentioned thermal stabilizer, its step is as follows:

[0039] a) Preparation of mixed salt solution

[0040] Add the soluble salts of magnesium, zinc, and aluminum into the stirring water at 60±5°C successively according to the set mass ratio of metal elements a:c:d of 2~4:0.05~0.5:1 to form a mixed salt solution , the total concentration of the three metal ions is 1.5-2.5mol / L;

[0041] b) Calcium salt solution preparation

[0042] Dissolve the soluble calcium salt in water, the dosage is 0.05-0.5:1 according to the mass ratio b:d of calcium and aluminum, and the concentration is 0.4-1.0mol / L;

[0043] c) Preparation of mixed lye

[0044] NaOH and Na 2 CO 3 Dissolve in water to make a mixed alkali solution, the amount of NaOH is 2 to 2.5 times the total moles of the above four metals, NaOH 2 CO 3 The dosage is 1 / 2~5 / 7 of the moles of aluminum ions, and the concentration of hydroxide in the mixed lye is 3.7~5.5mol / L;

[0045] d) ...

Embodiment 1

[0061] Mix 150mL of 6.6M NaOH solution with 60mL of 1M NaOH 2 CO 3 Add the solution into an 800mL stainless steel reaction kettle to make a mixed lye, and heat it to 60±5°C while stirring. 75 mL of 4M MgSO 4 solution, 62.5mL 0.8M Al 2 (SO 4 ) 3 solution and 50mL 0.5M ZnSO 4 After the solution is mixed, it is poured into the vigorously stirred mixed lye at one time, and then 50mL of 0.5M CaCl 2 The solution is poured into it. Raise the temperature to 95-97°C and keep for 3 hours, during which the pH is controlled at 12-14. Seal the reaction kettle, continue to heat up to 120±5°C, keep it for 3 hours, cool down to below 75°C, filter the feed liquid, wash the filter cake until the pH of the lotion is 7~8, dry and pulverize to obtain Mg-Ca-Zn-Al quaternary The hydrotalcite-like powder is 34.9g, and its chemical formula is determined by elemental analysis:

[0062] Mg 0.666 Ca 0.056 Zn 0.056 al 0.222 (OH) 2 (CO 3 ) 0.111 0.5H 2 o

[0063] or: Mg 6 Ca 0.5 Zn 0.5...

Embodiment 2

[0065] Mix 150mL of 6.6M NaOH solution with 60mL of 1M NaOH 2 CO 3 Add the solution into an 800mL stainless steel reaction kettle to make a mixed lye, and heat it to 60±5°C while stirring. 75 mL of 4M MgCl 2 solution, 62.5mL of 1.6M AlCl 3 solution and 25mL of 0.5M ZnCl 2 After the solution is mixed, it is poured into the vigorously stirred mixed lye at one time, and then 75mL of 0.5M CaCl 2 The solution is poured into it. Raise the temperature to 95-97°C and keep for 3 hours, during which the pH is controlled at 12-14. Seal the reaction kettle, continue to heat up to 120±5°C, keep it for 3 hours, cool down to below 75°C, filter the feed liquid, wash the filter cake until the pH of the lotion is 7~8, dry and pulverize to obtain Mg-Ca-Zn-Al quaternary The hydrotalcite-like powder is 34.6g, and its chemical formula is determined by elemental analysis:

[0066] Mg 0.666 Ca 0.084 Zn 0.028 al 0.222 (OH) 2 (CO 3 ) 0.111 0.5H 2 O or: Mg 6 Ca 0.75 Zn 0.25 al 2 (OH) ...

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Abstract

The invention provides Mg-Ca-Zn-Al quadribasic hydrotalcite heat stabilizer, wherein, three divalent metal ions contained are Mg<2+>, Ca<2+> and Zn<2+>; trivalent metal ions are Al<3+>, and anions are CO3<2->. The invention also provides a method for preparing the heat stabilizer, comprising the following steps of: a) preparation of salt-mixture solution; b) preparation of calcium salt solution; c) preparation of mixed alkali solution; d) normal-atmosphere reaction; e) pressurizing and aging; f) post treatment, during which Mg-Ca-Zn-Al quadribasic hydrotalcite powder is obtained. The heat stabilizer and the preparation method have the advantages that: the performance of the Mg-Ca-Zn-Al quadribasic hydrotalcite heat stabilizer is better than that of binary hydrotalcite; the preparation method is simple in technique, low in investment and low in cost; hazardous substances are not involved in the production process and no environmental pollution occurs. The congo red method and the heating method are used for testing the effect of the quadribasic hydrotalcite in improving the thermal stability of PVC; compared with the binary Mg-Al hydrotalcite, the thermal stabilization time of the quadribasic hydrotalcite at a temperature of 180+-1 DEG C is prolonged 29 to 54 percent.

Description

technical field [0001] The invention relates to a heat stabilizer for polyvinyl chloride resin, in particular to a Mg-Ca-Zn-Al quaternary hydrotalcite heat stabilizer. Background technique [0002] Chlorine-containing resins, especially polyvinyl chloride (PVC), are the first thermoplastics to be developed, and are ideal substitutes for steel and wood materials with a wide range of uses. However, poor thermal stability is its outstanding shortcoming, and thermal stabilizers must be added during processing. Although there are many kinds of heat stabilizers, most of them are toxic, or although the toxicity is slightly lower, they are expensive, and the performance of a few non-toxic heat stabilizers is not good. It is of great significance to develop a thermal stabilizer with moderate price, good environmental protection, non-toxic, odorless and excellent thermal stability. [0003] Hydrotalcite (Hydrotalcite) is a naturally formed anionic clay mineral with a layered structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/02C09C3/06C08L27/06
Inventor 周为民赵刚刘凤举
Owner TIANJIN HAOHUA CHEM INDAL
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