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Rare-earth heat stabilizer for PVC (Polyvinyl Chloride) and preparation method thereof

A kind of rare earth heat stabilizer and rare earth technology, which is applied in carboxylate preparation, organic chemistry, etc., can solve the problems of tin stabilizer with odor, calcium/zinc stabilizer with unstable thermal stability efficiency, lead salt heavy metal pollution, etc. , to achieve the effects of simple preparation method, prolonging thermal stability time, saving energy and cost

Inactive Publication Date: 2015-04-29
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lead salts are polluted by heavy metals, and lead salts have been banned in more and more places; tin stabilizers have peculiar smell when processed; the thermal stability efficiency of calcium / zinc stabilizers is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Ring-opening of coumarin: Add 2.9g of coumarin to 30ml, 10% (mass fraction) sodium hydroxide solution, place it in an oven at a constant temperature of 70°C for 6 hours, and the coumarin will open the ring to form an adjacent hydroxyl group Cinnamate.

[0024] (2) Add dilute nitric acid to the o-hydroxycinnamate solution under stirring conditions to adjust the pH to 5.5~6.0. Slowly drop 7.4ml of lanthanum nitrate solution with a concentration of 1.35mol / L into it under the condition of 60℃ and constant stirring, react for 2.5h, filter with suction, wash with alcohol 3~4 times, and wash with water 3~4 times, at 45 Dry at ~50°C and grind to get the finished product.

Embodiment 2

[0026] (1) Coumarin ring-opening: take 4.3g coumarin and add it to 30ml, 10% (mass fraction) sodium hydroxide solution, place it in an oven at a constant temperature of 80°C for 6 hours, and the coumarin will open the ring to form an adjacent hydroxyl group Cinnamate.

[0027] (2) Add dilute hydrochloric acid to the o-hydroxycinnamate solution under stirring conditions to adjust the pH to 6.5~8.0.

[0028] (3) Get 30ml of lanthanum chloride solution with a concentration of 0.60mol / L, then slowly drop the o-hydroxycinnamate solution in step (2) into the lanthanum nitrate solution at normal temperature, stir constantly, react by pumping after 2h Filter, wash with alcohol for 3-4 times, wash with water for 3-4 times, dry at 45-50°C, and grind to get the finished product.

[0029] The product prepared by embodiment 1 and embodiment 2 is compared with the thermal stability of other thermal stabilizers:

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Abstract

The invention discloses a rare-earth heat stabilizer for PVC (Polyvinyl Chloride) and a preparation method thereof. The main component of the rare-earth heat stabilizer is aromatic organic acid rare earth. The mass of the rare earth accounts for 25%-55% of the total mass of a stabilizer. A main raw material for preparing the stabilizer is coumarin or derivatives of the coumarin and rare-earth salts; and the preparation method of the rare-earth heat stabilizer comprises the steps of: firstly carrying out ring-opening on the coumarin or the derivatives of the coumarin to generate phenolic acid salts, adjusting pH, adding a rare-earth salt solution for reaction, then leaching, washing in alcohol, washing in water and drying to obtain the product. According to the rare-earth heat stabilizer, the coumarin or derivatives of the coumarin with low cost is / are taken as raw materials, reaction conditions are mild, and the finished product is yellow green powder and has very good long-term thermal stability for the PVC, aromatic odor, low toxicity and a very good application prospect.

Description

technical field [0001] The invention relates to a rare earth heat stabilizer for PVC and a preparation method thereof, belonging to the field of PVC heat stabilizers. Background technique [0002] As one of the five general-purpose plastics, polyvinyl chloride (PVC) has the biggest disadvantage of its poor thermal stability during processing. Therefore, heat stabilizers must be added during its processing. [0003] Traditional heat stabilizers include lead, metal soap, tin and calcium / zinc stabilizers. However, lead salts are polluted by heavy metals, and lead salts have been banned in more and more places; tin stabilizers have peculiar smell during processing; and the thermal stability efficiency of calcium / zinc stabilizers is unstable. [0004] Rare earth heat stabilizer is a kind of plastic stabilizer developed in recent years. It has good long-term stability, low toxicity, and also has the functions of coupling, toughening and plasticizing. Therefore, rare earth heat s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08K5/13C07C51/41C07C59/52
Inventor 柳召刚李梅王海鸥段成胡艳宏王觅堂
Owner INNER MONGOLIA UNIV OF SCI & TECH
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