Method for preparing thermostable nano hydrotalcite used in PVC resin

A PVC resin and thermal stabilization technology, applied in the field of preparation and application of chemical products, can solve the problems such as the influence of the change of the thermal decomposition temperature of PVC on the specific surface area of ​​nano-hydrotalcite, etc., and achieve a simple and easy preparation method and improve smoke suppression. , the effect of wide application

Inactive Publication Date: 2010-06-23
辽宁法库陶瓷工程技术研究中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of nano-hydrotalcite and PVC in the above reports has improved the smoke suppression performance of the system, but the change of PVC thermal decomposition temperature before and after the addition of hydrotalcite and the influence of the specific surface area of ​​nano-hydrotalcite on the modification effect have not been studied.

Method used

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  • Method for preparing thermostable nano hydrotalcite used in PVC resin
  • Method for preparing thermostable nano hydrotalcite used in PVC resin
  • Method for preparing thermostable nano hydrotalcite used in PVC resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 76.8gMg(NO 3 ) 2 ·6H 2 O and 56.3gAl(NO 3 ) 3 9H 2 O was dissolved in 0.5L deionized water to form a mixed salt solution, in which Mg 2+ / Al 3+ The molar ratio is 2:1, Mg 2+ The concentration is 0.6mol / L; another 24gNaOH and 21.2gNa 2 CO 3 Dissolve in 0.5L deionized water to make a mixed alkali solution, in which NaOH / Na 2 CO 3 The molar ratio is 3:1, NaOH / Mg 2+ The molar ratio of the two solutions was 2:1; the two solutions were quickly mixed in a colloid mill, and vigorously circulated and stirred for 1 minute. The resulting slurry was poured into a crystallization tank, 5 wt% PEG200 was added, and crystallized at 120° C. for 8 hours under vigorous stirring. The crystallized slurry was dried in a freeze dryer for 40 h.

[0036] By X-ray powder diffractometer (XRD) (see figure 1 ), Fourier transform infrared spectrometer (FT-IR) (see figure 2 ), scanning electron microscope (SEM) (see image 3 ), transmission electron microscopy (TEM) (see Figu...

Embodiment 2

[0040] Weigh 76.8gMg(NO 3 ) 2 ·6H 2 O and 56.3gAl(NO 3 ) 3 9H 2 O was dissolved in 1L deionized water to form a mixed salt solution, in which Mg 2+ / Al 3+ The molar ratio is 2:1, Mg 2+ The concentration is 0.3mol / L; another 24gNaOH and 21.2gNa 2 CO 3 Dissolve in 1L deionized water to make a mixed alkali solution, in which NaOH / Na 2 CO 3 The molar ratio is 3:1, NaOH / Mg 2+ The molar ratio of the two solutions was 2:1; the two solutions were quickly mixed in a colloid mill, and vigorously circulated and stirred for 1 minute. The resulting slurry was poured into a crystallization kettle, 2 wt% PEG200 was added, and crystallized at 100° C. for 8 hours under vigorous stirring. The crystallized slurry was dried in a freeze dryer for 48 hours.

Embodiment 3

[0042] Weigh 76.8gMg(NO 3 ) 2 ·6H 2 O and 28.15gAl(NO 3 ) 3 9H 2 O was dissolved in 0.5L deionized water to form a mixed salt solution, in which Mg 2+ / Al 3+ The molar ratio is 4:1, Mg 2+ The concentration is 0.6mol / L; another 18gNaOH and 15.9gNa 2 CO 3 Dissolve in 0.5L deionized water to make a mixed alkali solution, in which NaOH / Na 2 CO 3 The molar ratio is 3:1, NaOH / Mg 2+ The molar ratio of the two solutions was 1.5:1; the two solutions were quickly mixed in a colloid mill, and vigorously circulated and stirred for 1 minute. The resulting slurry was poured into a crystallization kettle, 5 wt% PEG300 was added, and crystallized at 110° C. for 6 hours under vigorous stirring. The crystallized slurry was dried in a freeze dryer for 35 hours.

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Abstract

The invention relates to a method for preparing thermostable nano hydrotalcite used in PVC resin, belonging to the technical field of chemical product preparation and application. The method can improve the thermostability and the smoke suppression performance of the PVC resin. The specific method comprises: A. 10-800g of soluble bivalent metal salts M2+Y and Al (NO3) 3.9 H2O are weighed, are dissolved in 0.2-1L of deionized water and are prepared into mixed salt solution, wherein the molar ratio of M2+ / Al3+ is 2-4:1 and the concentration of M2+ is 0.05-1mol / L; 2-370g of NaOH and Na2CO3 are weighed, are dissolved in 0.2-1L of deionized water and are prepared into mixed alkali solution, wherein the molar ratio of NaOH / Na2CO3 is 1-3:1 and the molar ratio of NaOH / M2+ is 1.5-2.5:1; and the two kinds of solution are rapidly mixed in a colloid mill and are violently and cyclically agitated for one minute; B. the obtained slurry is poured into a crystallization kettle, 1-5 percent of modifier is added by weight percent, and the obtained mixture is violently agitated and is crystallized under 70-150 DEG C for 2-24 hours; and C. the crystallized slurry is put in a lyophilizer for being lyophilized for 24-48 hours. The invention has the advantages that the preparation method is simple and feasible and the hydrotalcite can be widely used in the PVC preparation industry.

Description

technical field [0001] The invention relates to a preparation method of plastic additives, in particular to a preparation method of nanometer hydrotalcite that improves the thermal stability and smoke suppression performance of PVC resin, and belongs to the technical field of preparation and application of chemical products. Background technique [0002] Due to its good mechanical properties, low price, corrosion resistance and many other advantages, PVC resin has become the material of choice in the fields of chemical building materials, packaging materials, toys and so on. However, the thermal stability of PVC is poor, and its decomposition temperature is 120-130 ° C. In the range of processing temperature (above 160 ° C), reactions such as de-HCl, macromolecular cross-linking and thermal discoloration will occur, among which free HCl has an effect on de-HCl. Catalysis is an ionic reaction mechanism (Progr PolymSci, 2002, (27): 217), and heat stabilizers must be added to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08L27/06
Inventor 韩绍娟许壮志亢永珍薛健张明黄大勇时卓
Owner 辽宁法库陶瓷工程技术研究中心
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