Composite heat stabilizer for hydrophobic nano-hydrotalcite 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: 2009-09-30
慧科高新科技股份有限公司
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  • 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 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+ 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 the precipitate until the pH value is 7-8. Redissolve the precipitate a...

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-hydrotalcite with a Mg / Al molar ratio of 2:1, change the composition and ratio of the composite heat stabilizer, add the same amount to 100 parts of PVC, and then add 60 parts of diisooctyl phthalate (DOP ), and then according to the national standard GB2113-82 "Plastic whiteness test method", the prepared three kinds of PVC plastics are subjected to 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

(share) Modifier + Lubricant...

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Abstract

The invention relates to a composite heat stabilizer for hydrophobic nano-hydrotalcite PVC, comprising the following raw materials according to the mass percent: 30-50 of calcium stearate, 10-20 of zinc stearate, 10-30 of hydrophobic nano-hydrotalcite, 5-15 of lubricant, 4-7 of surface modifier and 5-15 of auxiliary heat stabilizer. With the method of coprecipitation, the hydrophobic nano-hydrotalcite is added with eunatrol to prepare hydrophobic nano-hydrotalcite including Mg and Al with the mol ratio of 2-3:1. The nano-hydrotalcite prepared by the invention has good hydrophobic nature. Good compatibility with a PVC basal body can be achieved if the nano-hydrotalcite is used in a composite heat stabilizer for PVC. Advantages of difficult precipitation and good stabilizing effect can be achieved when the nano-hydrotalcite is used as a stabilizer for plastic processing of PVC, and the like. The addition of the hydrophobic nano-hydrotalcite can reduce the balance torque, improve the processing property and reduce the cost. The preparation method causes no pollution and has 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 Applications(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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