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Rare earth hydrotalcite composite heat stabilizer for PVC and preparation method thereof

A composite heat stabilizer and hydrotalcite technology, applied in the field of polyvinyl chloride molding and processing, can solve the problems of short static thermal stability time, poor performance, only applicable, etc., achieve moderate torque, short plasticizing time, and improve processing performance. Effect

Active Publication Date: 2016-09-28
TANGSHAN NORMAL UNIV
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Problems solved by technology

The static heat aging test results show that the compounding of magnesium-aluminum rare earth hydrotalcite and calcium-zinc soap can effectively prolong the thermal stability time of PVC products, but the performance of the compound thermal stabilizer to inhibit the coloring of PVC products is not good
[0006] The Chinese patent application No. CN201310349425.9 applied for on August 12, 2013 is a patent in which rare earth-magnesium hydrotalcite and calcium-zinc agent are compounded and then added to rigid PVC. PVC products show excellent processing thermal stability and Mechanical properties, but its static thermal stability time is short, only 38.9min ~ 61.3min
[0007] The Chinese patent application No. CN201410019828.1 applied for on January 16, 2014 applied rare earth-magnesium hydrotalcite compounded with curcumin and calcium stearate to the molding process of rigid PVC resin. The results showed that PVC products have Excellent strength and toughness, however, the color of curcumin is darker after heating, so this composite heat stabilizer is only suitable for dark PVC products

Method used

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  • Rare earth hydrotalcite composite heat stabilizer for PVC and preparation method thereof
  • Rare earth hydrotalcite composite heat stabilizer for PVC and preparation method thereof

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preparation example Construction

[0028] The preparation method of the rare earth hydrotalcite composite heat stabilizer for PVC according to the second aspect of the present invention is used to prepare the rare earth hydrotalcite composite heat stabilizer for PVC according to the first aspect of the present invention, including the steps: (1) Divalent metal salt, trivalent metal salt and rare earth salt are soluble in CO removal 2 Of deionized water to obtain the first solution, where n(M 2+ ) / [n(M 3+ )+n(RE 3+ )]=2~3, n(RE 3+ ) / n(M 3+ )=0.02~0.12, n is the amount of substance, M 2+ Cation of divalent metal, M 3+ It is the cation of trivalent metal; (2) Sodium hydroxide and surfactant are dissolved in CO removal 2 Of deionized water to obtain a second solution, where n(NaOH) / [n(M 2+ )+n(M 3+ )+n(RE 3+ )]=2, n(surfactant) / [n(M 3+ )+n(RE 3+ )]=2; (3) in N 2 Under protection, drop the first solution and the second solution into 30ml-50mL deionized water, the reaction temperature is 85℃, stir to keep the pH of the r...

Embodiment 1

[0038] Weigh 23.1g Mg(NO 3 ) 2 ·6H 2 O, 10.7gAl(NO 3 ) 3 ·9H 2 O and 0.5g LaCl 3 ·6H 2 O soluble in CO removal 2 To obtain the first solution in the deionized water;

[0039] Weigh 9.6g NaOH and 17.3g sodium lauryl sulfate (C 12 H 25 SO 4 Na) soluble in CO removal 2 Of deionized water to obtain a second solution;

[0040] In N 2 Under protection, slowly drop the first solution and the second solution into a three-necked flask pre-filled with 50 mL of deionized water. The reaction temperature is 85°C, with vigorous stirring, and the pH of the reaction solution is maintained at 11-13. After the addition is complete, Reflux at 85°C for 4 hours, then age the reaction solution at 110°C for 8 hours, filter, wash, dry, and grind to obtain sodium lauryl sulfate pillared magnesium aluminum lanthanum hydrotalcite;

[0041] In parts by mass, take 30 parts of sodium lauryl sulfate pillared magnesium aluminum lanthanum hydrotalcite, 35 parts of pentaerythritol and 20 parts of β-diketone, mix and ...

Embodiment 2

[0043] Weigh 5.5g ZnCl 2 , 6.7gAl(NO 3 ) 3 ·9H 2 O and 0.8g Ce(NO 3 ) 3 ·6H 2 O soluble in CO removal 2 To obtain the first solution in the deionized water;

[0044] Weigh 4.8g NaOH and 10.9g sodium dodecyl sulfonate (C 12 H 25 SO 3 Na) soluble in CO removal 2 Of deionized water to obtain a second solution;

[0045] In N 2 Under protection, slowly drop the first solution and the second solution into a three-necked flask pre-filled with 40 mL of deionized water. The reaction temperature is 85°C, and the reaction temperature is vigorously stirred to maintain the pH of the reaction solution at 11-13. After the addition is complete, Reflux at 85°C for 6 hours, then age the reaction solution at 110°C for 12 hours, filter, wash, dry, and grind to obtain dodecyl sulfonic acid pillared zinc aluminum cerium hydrotalcite;

[0046] In parts by mass, take 45 parts of dodecyl sulfonic acid pillared zinc-aluminum-cerium hydrotalcite, 50 parts of pentaerythritol and 40 parts of β-diketone, mix and ...

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Abstract

The invention provides a rare-earth hydrotalcite composite heat stabilizer for PVC and a preparation method of the heat stabilizer. The rare-earth hydrotalcite composite heat stabilizer for PVC comprises the following components in parts by mass: 20-60 parts of surfactant pillared rare-earth hydrotalcite, 30-80 parts of pentaerythritol and 10-50 parts of beta-diketone. According to the rare-earth hydrotalcite composite heat stabilizer for PVC disclosed by the invention, initial stage coloring of PVC products can be well inhibited, and the thermal stability, the processability and mechanical property of the PVC products can be effectively improved.

Description

Technical field [0001] The invention relates to the field of polyvinyl chloride molding and processing, in particular to a rare earth hydrotalcite composite heat stabilizer for PVC and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general plastics, which has the advantages of high strength, corrosion resistance, and good insulation. However, the thermal stability of PVC is poor. Generally, it will decompose when heated to 120℃~130℃ and produce HCl. Therefore, a certain amount of heat stabilizer needs to be added during the PVC molding process (around 170°C). Traditional heat stabilizers, such as lead salt heat stabilizers and organotin heat stabilizers, are declining their market share year by year due to toxicity or high prices. The high-efficiency, non-toxic (or low-toxic), environmentally friendly composite heat stabilizer has become one of the research hotspots. [0003] Hydrotalcite compounds are a type of inorganic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08K9/04C08K7/00C08K3/26C08K5/053C08K5/07
CPCC08K3/26C08K5/053C08K5/07C08K7/00C08K9/04C08L2201/08C08L27/06
Inventor 张宁
Owner TANGSHAN NORMAL UNIV
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