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Method for preparing hydrophobic nanometer hydrotalcite

A nano hydrotalcite and hydrophobic technology, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of unsatisfactory stabilization effect of composite stabilizer, limitation of hydrotalcite application effect, difficulty in uniform mixing, etc., and achieve a good initial stage Good coloring property, good stabilizing effect, good hydrophobic effect

Inactive Publication Date: 2009-09-23
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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  • Method for preparing hydrophobic nanometer hydrotalcite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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) of 2:1 molar ratio, 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 prec...

Embodiment 2

[0027] 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 is dissolved in 500ml deionized water and is mixed with Mg2+ and Al3+ in a molar ratio of 3: 1 mixed solution (solution B), and 64.00gNaOH and 10.60gNa 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.

[0028] The hydrotalcite prepared in embodiment 1 and 2 is mixed with calcium stearate, zinc stearate, lubricant, surface modifier and auxiliary thermal stabilizer respectively, and concrete mixing method is as follows:

[0029] 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 a...

Embodiment 4～5

[0035] Use hydrophobic nano-hydrotalcite 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 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.

[0036] Table 2

[0037] Example

Hydrophobic Nano

Hydrotalcite (parts)

Calcium stearate (parts)

Zinc stearate

(share)

...

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Abstract

The invention relates to a method for preparing hydrophobic nanometer hydrotalcite. The hydrophobic nanometer hydrotalcite with Mg<2+> / Al<3+> of which the molar ratio is 2-3:1 is prepared by adopting a coprecipitation method by adding eunatrol, and leached by using methylbenzene under the action of a phase transfer agent. The hydrophobic nanometer hydrotalcite can be mixed with calcium stearate and zinc stearate and then is added with a lubricating agent, a surfaction agent and an auxiliary stabilizing agent to prepare a composite heat stabilizing agent for hydrophobic nanometer hydrotalcite base PVC. The hydrophobic nanometer hydrotalcite prepared by the method has better hydrophobicity and good compatibility with PVC matrixes, can be used as a stabilizing agent for processing plastics such as PVC, and the like and has the characteristics of no easy separation and good stabilizing effect. The addition of the hydrophobic nanometer hydrotalcite can reduce the balancing torque, improve the processing performance and reduce the cost.

Description

technical field [0001] The invention relates to the preparation of a hydrophobic nanometer hydrotalcite which is used for polyvinyl chloride and has 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 pr...

Claims

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Application Information

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IPC IPC(8): C01B13/14C01F7/02B82B3/00
Inventor 唐守余
Owner 慧科高新科技股份有限公司
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