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Modified hydrotalcite and preparation method thereof, PVC heat stabilizer and application

A heat stabilizer and modified water technology, applied in the field of modified hydrotalcite and its preparation, PVC heat stabilizer, can solve the problem of "zinc salt" failure, etc., achieve simple operation, easy industrialization, excellent initial whiteness and long-term thermal stability

Active Publication Date: 2021-09-28
浙江宏天新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a modified hydrotalcite that can effectively improve the long-term thermal stability of PVC and the initial whiteness in order to overcome the problem of “zinc salt” failure caused by the compounding of traditional PVC heat stabilizer hydrotalcite and zinc salt

Method used

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  • Modified hydrotalcite and preparation method thereof, PVC heat stabilizer and application
  • Modified hydrotalcite and preparation method thereof, PVC heat stabilizer and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Preparation steps of uracil epoxy acid group intercalated hydrotalcite (T-LDHs):

[0061] (1) Dissolve 4-thiouracil in acetic acid in a three-necked round-bottom flask, and dissolve for 0.5 h in a water bath at 60° C. under the conditions of 200 r / min magnetic stirring and heating to obtain a 1.75 mol / L 4-thiouracil solution.

[0062] (2) Nitrogen gas was passed into the three-neck round bottom flask, glycidic acid was slowly added dropwise into the flask at a rate of 2 mL / min, and the molar ratio of glycidic acid to 4-thiouracil was 1:1.5. After reacting for 10 hours, filter with suction, wash and dry in an oven at 50°C for 5 hours to obtain 4-thiouracil glycidic acid.

[0063] (3) Titrate the NaOH solution with a concentration of 1.0 mol / L into the 4-thiouracil glycidic acid solution until the pH value is 8.0 to obtain the 4-thiouracil glycidic acid base solution.

[0064] (4) Pour the 4-thiouracil glycidic acid base solution into a three-necked round-bottomed fla...

Embodiment 2

[0071] 1. Preparation steps of uracil epoxy acid group intercalated hydrotalcite (T-LDHs):

[0072] (1) Dissolve 2-thiouracil in chloroform in a three-necked round-bottomed flask, and dissolve it in a water bath at 40°C with 400r / min magnetic stirring and heating for 0.5h to obtain 1.30mol / L 2-thiouracil solution.

[0073] (2) Nitrogen was passed into the three-necked round bottom flask, and epoxycaproic acid was slowly added dropwise into the flask at a rate of 1 mL / min. The molar ratio of epoxycaproic acid to 2-thiouracil was 1:1.1. After reacting for 6 hours, filter with suction, wash and dry in an oven at 40°C for 8 hours to obtain 2-thiouracil epoxycaproic acid.

[0074] (3) Titrate the NaOH solution with a concentration of 1.2 mol / L into the 2-thiouracil epoxycaproic acid solution until the pH value is 9.0 to obtain the 2-thiouracil epoxycaproic acid base solution.

[0075] (4) Pour the 2-thiouracil epoxy caproic acid base solution into a three-necked round bottom flas...

Embodiment 3

[0082] 1. Preparation steps of uracil epoxy acid group intercalated hydrotalcite (T-LDHs):

[0083] (1) Dissolve 1,3-dimethyl-6-aminouracil in acetic acid in a three-necked round-bottomed flask, and dissolve it in a 70°C water bath and 100r / min magnetic stirring for 0.5h to obtain 2.33mol / min L uracil solution.

[0084] (2) Pass argon into the three-neck round bottom flask, slowly drop methylglycidic acid into the flask at a rate of 2mL / min, methylglycidic acid 1,3-dimethyl-6 - The molar ratio of aminouracil is 1:2. After reacting for 12 hours, filter with suction, wash and dry in an oven at 60°C for 4 hours to obtain 1,3-dimethyl-6-aminouracil methylglycidic acid.

[0085] (3) NaOH solution with a concentration of 1.5mol / L is titrated into 1,3-dimethyl-6-aminouracil glycidic acid solution until the pH value is 7.5 to obtain 1,3-dimethyl- 6-aminouracil methyl glycidic acid primer.

[0086] (4) Pour the 1,3-dimethyl-6-aminouracil methyl glycidic acid base solution into a th...

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Abstract

The invention relates to the technical field of PVC (polyvinyl chloride) heat stabilizers, and provides modified hydrotalcite and a preparation method thereof as well as a PVC heat stabilizer and application thereof in order to solve the problem that zinc salt is invalid after hydrotalcite and zinc salt are compounded in a traditional PVC heat stabilizer, and the modified hydrotalcite is obtained by in-situ synthesis of uracil, epoxy acid, metal salt and other auxiliaries. Urea pyrimidine epoxy acid with excellent HCl absorption and instable chlorine atom substitution is intercalated between hydrotalcite layers, so that the HCl absorption and instable chlorine atom substitution capabilities of modified hydrotalcite can be improved, by-products, such as AlCl3 and MgCl2, capable of replacing Zn after metal strong oxides in the layers absorb HCl can be complexed, and zinc ions in the zinc salt heat stabilizer are prevented from being replaced by AlCl3, MgCl2 and the like; and the modified hydrotalcite and the zinc salt can be used as a PVC heat stabilizer to be applied to a PVC product after being compounded, and the obtained product has excellent initial whiteness and long-term heat stability.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride (PVC) heat stabilizers, in particular to a modified hydrotalcite, a preparation method thereof, a PVC heat stabilizer and applications. Background technique [0002] In recent years, people's awareness of environmental protection has become stronger and stronger, and various environmental protection policies have been introduced. Among them, in the field of PVC heat stabilizers, heat stabilizers containing some toxic metal elements such as lead and tin have gradually withdrawn from the market. Since heat stabilizers are necessary additives for the processing of PVC products, researchers have developed many environmentally friendly heat stabilizers to replace some toxic heat stabilizers containing lead and tin. Hydrotalcite is an environmentally friendly heat stabilizer that is widely used, especially in the field of transparent soft PVC products. [0003] The thermal stability mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K3/26C08K5/098C08K5/523C08K5/134C08K5/526C08K5/103C08L23/06C08L27/06
CPCC08K9/04C08K3/26C08K5/098C08K5/523C08K5/1345C08K5/526C08K5/103C08L23/06C08L27/06C08L2201/08
Inventor 施燕琴张伟民王旭朱小云陈路凯
Owner 浙江宏天新材料科技有限公司
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