Composite heat stabilizer for hydrophobic nano hydrotalcite-based PVC and preparation method thereof

A composite heat stabilizer and nano-hydrotalcite technology, which is applied in the field of composite heat stabilizers, can solve the problems of unsatisfactory stabilization effect of composite stabilizers, limited application effect of hydrotalcite, poor compatibility, etc., and achieve good initial coloring property , good stability and good solubility

Inactive Publication Date: 2011-11-30
慧科高新科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrophilic hydrotalcite has poor compatibility with organic substances such as polyvinyl chloride, it is difficult to mix uniformly, and it is easy to precipitate, which makes the stabilization effect of the composite stabilizer unsatisfactory, which greatly limits the application of hydrotalcite in the PVC composite heat stabilizer. apply effects

Method used

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  • Composite heat stabilizer for hydrophobic nano hydrotalcite-based PVC and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare 2×10 -3 mol / l sodium oleate aqueous solution (solution A), weigh 98.59g MgSO 4 ·7H 2 O and 66.64gAl 2 (SO 4 ) 3 18H 2 O was dissolved in 500ml deionized water to make Mg 2+ and Al 3+ According to the mixed solution (solution B) with a molar ratio of 2:1, 48.00g NaOH and 10.60g Na 2 CO 3 Dissolve in 500ml deionized water to make OH - / CO 3 2- A mixed solution with a molar ratio of 12:1 (Solution C). Take 500ml of solution A and put it into a 2L three-necked flask, heat it in a water bath to 40-60°C, under the condition of vigorous stirring, add 500ml of solution B and 500ml of solution C dropwise at the same time, and the dropping speed should be completed within 45min. During the dropwise addition, the pH value of the solution was kept at 9.0-9.5. Continue to stir for 30 minutes after the dropwise addition, then increase the temperature of the water bath to 60-80°C for 3 hours, cool to room temperature naturally, repeat suction filtration, and wash ...

Embodiment 2

[0032] According to the preparation steps of Example 1, weigh 147.89g MgSO 4 ·7H 2 O and 66.64g Al 2 (SO 4 ) 3 18H 2 O was dissolved in 500ml deionized water to make Mg 2+ and Al 3+ According to the mixed solution (solution B) with a molar ratio of 3:1, mix 64.00g NaOH with 10.60g NaOH 2 CO 3 Dissolve in 500ml deionized water to make OH - / CO 3 2- A mixed solution with a molar ratio of 16:1 (Solution C). According to the steps of the above method, the hydrophobic nano-hydrotalcite with a magnesium-aluminum molar ratio of 3:1 is prepared. The particle size of the prepared hydrotalcite is 30-70nm.

[0033] The prepared hydrotalcite is mixed with calcium stearate, zinc stearate, lubricant, surface modifier and auxiliary heat stabilizer, and the specific mixing method is as follows:

[0034] First add calcium stearate (30 parts), zinc stearate (20 parts) and hydrotalcite (20 parts) into the reaction kettle and mix well. Take the mixed material, heat and stir in a kne...

Embodiment 4～5

[0040] Use hydrophobic nano-hydrotalcites with Mg / Al molar ratio of 2:1, change the composition and ratio of the composite heat stabilizer, add it to 100 parts of PVC in the same amount, and then add 60 parts of diisooctyl phthalate (DOP ), and then according to the national standard GB2113-82 "Plastic whiteness test method", the three kinds of PVC plastics prepared are subjected to the heat-resistant whiteness test. Table 2 is the composition formula of three kinds of composite heat stabilizers, and Table 3 is to put the test piece on The relative whiteness value tested in the whiteness meter tested with a standard whiteness board with a whiteness of 85%. It can be found from Table 3 that the prepared hydrophobic nano-hydrotalcite composite stabilizer has excellent thermal stability compared with traditional stabilizers.

[0041] Table 2

[0042] Example

Hydrophobic Nano

Hydrotalcite (parts)

Calcium stearate

(share)

Zinc stearate

(...

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Abstract

Hydrophobic nano-hydrotalcite-based composite heat stabilizer for PVC is composed of the following raw materials in mass percentage: 30-50% calcium stearate, 10-20% zinc stearate, 10-30% hydrophobic nano-hydrotalcite, Lubricant 5-15%, surface modifier 4-7%, auxiliary heat stabilizer 5-15%. Wherein the hydrophobic nanometer hydrotalcite adopts the co-precipitation method, and sodium oleate is added to prepare the hydrophobic nanometer hydrotalcite with a molar ratio of Mg:Al of 2-3:1. The nanometer hydrotalcite prepared by the present invention has good hydrophobicity, and it can be used as a composite heat stabilizer for PVC, which can have good compatibility with PVC matrix, and can be used as a stabilizer for plastic processing such as PVC, and has the property that it is not easy to separate out , Good stability effect. Adding hydrophobic nano-hydrotalcite can reduce balance torque, improve processing performance and reduce cost. The preparation method of the invention has no pollution and low energy consumption.

Description

technical field [0001] The invention relates to a composite thermal stabilizer prepared by utilizing hydrophobic nano hydrotalcite with long-term thermal stability. Background technique [0002] As we all know, PVC is easy to decompose under processing temperature conditions, and a stabilizer must be added to make it process smoothly. In addition, when polyvinyl chloride is heated or exposed to ultraviolet radiation, it will also cause polymer degradation and de-HCl. Therefore, the use and processing of PVC must use stabilizers. Stabilizer is a chemical additive that can inhibit the degradation and discoloration of PVC caused by heat and light during processing and use. Stabilizers can be divided into five categories according to their chemical structures: base lead salt stabilizers, metal soaps, organotin compounds, organic stabilizers and composite stabilizers. [0003] Due to the advantages of easy-to-obtain raw materials, simple production process, low price, and exce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K13/02C08K5/098C08K3/34C08L27/06
Inventor 唐守余
Owner 慧科高新科技股份有限公司
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