Preparation method of pvc heat stabilizer

A technology of heat stabilizer and solution, applied in the field of preparation of PVC heat stabilizer, can solve the problems of unstable heat stabilization efficiency of calcium/zinc stabilizers, peculiar smell of tin stabilizers, and heavy metal pollution of lead salts, etc. Thermal stabilization time, good synergy, easy handling effect

Active Publication Date: 2019-07-30
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of pvc heat stabilizer
  • Preparation method of pvc heat stabilizer

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preparation example Construction

[0017] The preparation method of the PVC heat stabilizer of the present invention comprises the following steps: S101: mixing a tartaric acid solution with a mass percentage concentration of 0.8% to 24% and a sodium hydroxide solution with a mass percentage concentration of 1.4% to 14%, Heating to 50°C-80°C under stirring condition, then keeping it warm for 0.5h-2h, and then adjusting the temperature to 60°C-90°C; wherein, the molar ratio of tartaric acid to sodium hydroxide is 1:(3.5-8); S102: Take a rare earth salt solution with a molar concentration of 0.1mol / L to 1.5mol / L, and add the rare earth salt solution dropwise to the solution obtained in step S101 while stirring until the pH of the solution is 6.5 to 7.5 , stop the dropwise addition of the rare earth salt solution, then continue to stir and react for 1h to 3h, and then perform suction filtration, washing, and drying in sequence to obtain a PVC heat stabilizer.

[0018] The preparation method of the PVC thermal stab...

Embodiment 1

[0023] Embodiment 1 proposes a kind of PVC thermal stabilizer, and its preparation method comprises the steps:

[0024] (1) The tartaric acid solution that is 0.8% by mass percentage concentration is mixed with the sodium hydroxide solution that is 14% by mass percentage concentration, then heated to 50°C and then incubated for 2h, then the temperature is adjusted to 60°C; wherein, tartaric acid and The molar ratio of sodium hydroxide is 1:3.5.

[0025] (2) get the lanthanum cerium nitrate solution (La 2 o 3 / ΣREO is 35.4%, CeO 2 / ΣREO is 64.6%), while stirring, the lanthanum cerium nitrate solution is added dropwise to the solution obtained in the step (1), until the pH value of the solution is 7.5, stop adding the rare earth salt solution dropwise, Then continue to stir and react for 1 hour, then perform suction filtration and washing in sequence, and then dry at a temperature of 100° C. to obtain a PVC heat stabilizer; wherein, the rate of adding the rare earth salt solu...

Embodiment 2

[0027] Embodiment 2 proposes a kind of PVC thermal stabilizer, and its preparation method comprises the steps:

[0028] (1) Mix a tartaric acid solution with a mass percentage concentration of 24% and a sodium hydroxide solution with a mass percentage concentration of 1.4%, then heat it to 80°C and keep it warm for 0.5h, then adjust the temperature to 90°C; wherein, tartaric acid The molar ratio with sodium hydroxide is 1:8.

[0029] (2) get the cerium chloride solution that the molar concentration is 1.5mol / L, while stirring, the cerium chloride solution is added dropwise in the solution that described step (1) obtains, until the pH value of the solution is 6.5 , stop adding the rare earth salt solution dropwise, then continue to stir and react for 3h, then carry out suction filtration and washing successively, and then dry at 60°C to obtain a PVC heat stabilizer; wherein, the rate when adding the rare earth salt solution dropwise It is 1L / min.

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Abstract

The invention relates to a PVC heat stabilizer and a preparing method thereof. The preparing method comprises the following steps of mixing a tartaric acid solution and a sodium hydroxide solution, then heating the mixed solution to 50-80 DEG C, conducting heat preservation for 0.5-2 h, and then adjusting the temperature of the mixed solution to 60-90 DEG C; taking a rare earth salt solution, dropwise adding the rare earth salt solution into the mixed solution, till the pH value of the solution is 6.5-7.5, stopping dropwise adding, then continuing a stirring reaction, and then conducting suction filtration, washing and drying in sequence to obtain the PVC heat stabilizer. The preparing method of the PVC heat stabilizer is simple, feasible, mild in reaction condition in the whole process and easy to operate. The prepared PVC heat stabilizer prepared through the preparing method is nontoxic and efficient, contains basic groups, and is high in rare earth content and excellent in performance; compared with other organic acid rare earth, the PVC heat stabilizer can drastically prolong the heat stabilizing time of PVC when in single use, and has a good synergistic effect when in joint use with stabilizers of other varieties.

Description

technical field [0001] The invention belongs to the technical field of polymer material processing, and relates to a preparation method of a PVC heat stabilizer. Background technique [0002] Polyvinyl chloride, also known as PVC, is one of the most popular resins in the world. Because PVC has excellent acid and alkali resistance, wear resistance, electrical insulation, flame retardant, self-extinguishing, etc., it is widely used in industry, agriculture, construction and other fields. However, in the process of PVC processing, due to the effect of temperature and shear force, PVC tends to degrade, and the degradation product HCl will catalyze the accelerated degradation of PVC. Therefore, during the processing of PVC, heat stabilizers need to be added to prevent the degradation of PVC. degradation. 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 m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08K5/098
CPCC08K5/098C08L2201/08C08L27/06
Inventor 柳召刚李梅胡艳宏王觅堂张晓伟董昕
Owner INNER MONGOLIA UNIV OF SCI & TECH
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