Hydrotalcite acid acceptor for polyolefin

An acid absorbing agent and polyolefin technology, applied in the field of polyolefin additives, can solve problems such as damage, calcium stearate residue, stainless steel corrosion, etc., and achieve the effect of improving stability, increasing dispersibility, and not easy to precipitate

Active Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ziegler-Natta catalysts and free radical initiators used in polyolefin synthesis can reduce side reactions and better obtain products with less branched chains, but because Ziegler-Natta catalysts mostly deposit titanium chloride on CaCl 2 Crystal or SiO 2 On the carrier, this will cause a small amount of chlorine-containing compounds to remain in the product. In addition, other additives (mainly bromine-containing flame retardants) will also leave other acidic impurities in the production process. These residues will make pro...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Mg(NO 3 ) 2 and Al(NO 3 ) 3 According to Mg 2+ / Al 3+ The ratio of molar ratio is 2:1 to prepare mixed salt solution, NaOH and Na 2 CO 3 According to OH - / (Ca 2+ +Al 3+ ) molar ratio is 1.6, CO 3 2- / (Al 3+ ) molar ratio is the ratio preparation mixed alkali solution of 2, wherein, Mg 2+ Concentration is 0.6mol / L, Al 3+ Concentration is 0.3mol / L, NaOH concentration is 1.44mol / L, NaOH 2 CO 3 The concentration is 0.6mol / L. Equal volumes of salt solution and alkali solution were quickly mixed, followed by crystallization at 100 °C for 6 h to obtain CO 3 - LDHs slurry, naturally cooled to room temperature, the slurry was washed and centrifuged until the supernatant was neutral to obtain LDHs filter cake, and the filter cake was dried in an oven at 60°C for 10 hours, and the magnesium used for polyolefin synthesis was obtained after grinding Aluminum hydrotalcite acid absorbing agent, its structural formula is [Mg 0.66 Al 0.33 (OH) 2 ](CO ...

Embodiment 2

[0012] CaSO 4 and Al 2 (SO 4 ) 3 According to Ca 2+ / Al 3+ The ratio of molar ratio is 3:1 to prepare mixed salt solution, NaOH and Na 2 CO 3 According to OH - / (Ca 2+ +Al 3+ ) molar ratio is 2, CO 3 2- / (Al 3+ ) molar ratio is the ratio preparation mixed alkali solution of 2, wherein, Ca 2+ Concentration is 0.9mol / L, Al 3+ Concentration is 0.3mol / L, NaOH concentration is 2.4mol / L, NaOH 2 CO 3 With a concentration of 0.6mol / L, equal volumes of salt solution and alkali solution were quickly mixed, followed by crystallization at 80°C for 6h to obtain CO 3 - LDHs slurry, naturally cooled to room temperature, the slurry was washed and centrifuged until the supernatant was neutral to obtain LDHs filter cake, and the filter cake was dried in an oven at 60°C for 10 hours, and the calcium for polyolefin synthesis was obtained after grinding Aluminum hydrotalcite acid absorbing agent, its structural formula is [Ca 0.75 Al 0.25 (OH) 2 ](CO 3 ) 0.125 ·H...

Embodiment 3

[0014] CaCl 2 , MgCl 2 and AlCl 3 According to Mg 2+ / Ca 2+ / Al 3+ The molar ratio is 1:1:1 to prepare mixed salt solution, NaOH and Na 2 CO 3 According to OH - / (Mg 2+ +Ca 2+ +Al 3+ ) molar ratio is 1.6, CO 3 2- / (Al 3+ ) molar ratio is the ratio preparation mixed alkali solution of 2, wherein, Mg 2+ The concentration is 0.4mol / L, Ca 2+ Concentration is 0.4mol / L, Al 3+ Concentration is 0.4mol / L, NaOH concentration is 1.92mol / L, NaOH 2 CO 3 The concentration is 0.8mol / L. Equal volumes of salt solution and alkali solution were quickly mixed, followed by crystallization at 120 °C for 6 h to obtain CO 3 - LDHs slurry, naturally cooled to room temperature, the slurry was washed and centrifuged until the supernatant was neutral to obtain LDHs filter cake, and the filter cake was dried in an oven at 60°C for 10 hours, and the magnesium used for polyolefin synthesis was obtained after grinding Calcium aluminum hydrotalcite acid absorbing agent, it...

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Abstract

The invention discloses a hydrotalcite acid acceptor for polyolefin. The hydrotalcite has a structural formula [Mga(1-x) <2+>Ca(1-a)(1-x)<2+>Alx<3+>(OH)2]<x+>(A<n->)x/n.yH2O, wherein A<n-> is an interlayer negative ion, n is the charge number of the interlayer negative ion and is equal to 1-7; x is the ratio of the amount of substance of Al<3+> to (Ca<2+>+ Al<3+>) and has a value range of equal to or greater than 0.2 and less than or equal to 0.33; a is the ratio of the amount of substance of Mg<2+> to (Mg<2+>+ Ca<2+>) and has a value range of equal to or greater than 0 and less than or equal to 1; and y is the number of water of crystallization and has a value range of equal to or greater than 0 and less than or equal to 2. By adopting hydrotalcite as a clean polyolefin talc acid acceptor, chlorine ions can be effectively absorbed and fixed by virtue of the layered structure and the porous structure of hydrotalcite and by virtue of intercalation modification of the organic acid negative ion, the dispersity of hydrotalcite in the resin can be increased; by adjusting and controlling the laminate structure and interlayer negative ion, the different application requirements can be met and meanwhile, hydrotalcite is hardly precipitated in the resin, the corrosion of metal stearate acid acceptor residues to a production device is eliminated and the acid acceptor is low in toxicity and environment friendly and is in line with the requirements of the current environment-friendly production.

Description

Technical field: [0001] The invention belongs to the field of polyolefin additives, in particular to a hydrotalcite acid absorbing agent for polyolefin. Background technique [0002] Ziegler-Natta catalysts and free radical initiators used in polyolefin synthesis can reduce side reactions and better obtain products with less branched chains, but because Ziegler-Natta catalysts mostly deposit titanium chloride on CaCl 2 Crystal or SiO 2 On the carrier, this will cause a small amount of chlorine-containing compounds to remain in the product. In addition, other additives (mainly bromine-containing flame retardants) will also leave other acidic impurities in the production process. These residues will make products made of polymers in the long-term Discoloration and damage will also occur during the use of stainless steel. At the same time, chloride ions are also common corrosive ions, which can easily cause corrosion of stainless steel and cause harm to production equipment an...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L23/08C08L23/14C08L23/20C08L45/00C08K9/02C08K9/04C08K3/22
CPCC08K3/22C08K9/04C08L23/06C08L23/0853C08L23/0869C08L23/12C08L23/147C08L23/20C08L45/00
Inventor 林彦军宁波夏敏李凯涛
Owner BEIJING UNIV OF CHEM TECH
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