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PVC smoke suppressant and preparation method thereof

A technology of smoke suppressant and hydrotalcite, which is applied in the field of plastic additives, can solve the problems of reduced amplitude reduction, unchanged practical application, complicated in-situ polymerization process, etc., and achieves the effects of enhanced dispersibility and high efficiency

Active Publication Date: 2019-01-01
山东万新威纳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN201510998943 announced that hydrotalcite materials have obvious effects in flame retardancy and smoke suppression of plastics, document: Combustion characteristics of hydrotalcite / zinc compound compound modified polyvinyl chloride, Su Hu, Zhejiang University, 2011-06: 6 -7, It is reported that nano-hydrotalcite can reduce the smoke density by 59.2% after participating in the in-situ polymerization of PVC, but the in-situ polymerization process is more complicated, and the actual application remains unchanged. In the common blending process, the effect of hydrotalcite on the smoke density of PVC The magnitude of the reduction has been reduced

Method used

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  • PVC smoke suppressant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Hydrotalcite preparation:

[0026] Weigh 58g Mg(OH) 2 and 39g Al(OH) 3 , add water to prepare a slurry with a solid content of 10%, raise the temperature to 150°C, and introduce CO 2 , and stirred for 6 hours to obtain a hydrotalcite slurry with a solid content of 16.3%.

[0027] Zinc oxide coating:

[0028] Weigh 307g of the slurry to make the hydrotalcite content 50g, weigh 3.55g of zinc sulfate heptahydrate and add it to the above-mentioned hydrotalcite slurry, heat to 60°C, then prepare 0.99g of sodium hydroxide into a 10% aqueous solution, add dropwise into the hydrotalcite slurry, continue to react for 4 hours after dripping, filter and wash twice, and reconstitute the washed filter cake into a slurry with a solid content of 0.5-25%.

[0029] Surface modification of coated zinc oxide hydrotalcite:

[0030] Heat the zinc oxide-coated hydrotalcite slurry to 80 ° C, add a modifier stearic acid, the amount of modifier is 4% of the solid content of the slurry, rea...

Embodiment 2

[0035] Hydrotalcite preparation:

[0036] Weigh Mg(OH) 2 87g, Al(OH) 3 39g. Mg(OH) 2 with Al(OH) 3 Prepare a slurry with a solid content of 5%, add 57.6g of 85% phosphoric acid and raise the temperature to 160°C, stir and react for 8 hours to obtain a slurry of hydrotalcite with a solid content of 8.5%.

[0037] Zinc oxide coating:

[0038] Weigh 588g of the slurry to make its solid content 50g, weigh 3.36g of zinc chloride and add it to the above-mentioned hydrotalcite slurry, heat to 80 degrees, and then prepare 1.98g of sodium hydroxide into a 30% aqueous solution; add dropwise to the hydrotalcite In the slurry, the reaction is continued for 6 hours after dropping, the modified hydrotalcite is washed three times, and the washed filter cake is prepared into a slurry with a solid content of 0.5-25%.

[0039] Surface modification of coated zinc oxide hydrotalcite:

[0040] The temperature of the zinc oxide-coated hydrotalcite slurry was raised to 80°C, and a modifier,...

Embodiment 3

[0044]Hydrotalcite preparation:

[0045] Weigh Mg(OH) 2 69.6g, Al(OH) 3 39g, prepared as a slurry with a solid content of 15%, adding 185.5g of boric acid, heating up to 170°C, and stirring for 10 hours to obtain a slurry of hydrotalcite with a solid content of 24.1%.

[0046] Zinc oxide coating:

[0047] Weigh 207g of the slurry to make its solid content 50g, weigh 9.18g of zinc nitrate hexahydrate and add it to the hydrotalcite slurry and heat it to 90 degrees, then prepare 2.48g of sodium hydroxide into a 40% aqueous solution and add it dropwise to the hydrotalcite slurry , continue to react for 3 hours after dropping, wash the modified hydrotalcite for 4 times, and prepare the washed filter cake into stone slurry with a solid content of 0.5-25%.

[0048] Surface modification of coated zinc oxide hydrotalcite:

[0049] Heat the zinc oxide-coated hydrotalcite slurry to 80°C, add the modifier zinc laurate, the amount of the modifier is 4% of the solid content of the slu...

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Abstract

The invention discloses a PVC smoke suppressant and a preparation method thereof. The PVC smoke suppressant is modified ZnO-coated hydrotalcite and is expressed as ZnO / LDHs. According to the invention, a method of in-situ formation of ZnO on the surface of hydrotalcite is adopted to coat the surface of hydrotalcite with ZnO, so ZnO is tightly bonded with hydrotalcite; and since ZnO has a large specific surface area, when ZnO is used as a smoke suppressant, the catalytic charcoal formation effect of ZnO and the physical barrier effect of hydrotalcite occur at a molecular level, and thus, stronger synergistic effect is obtained and suppression effect on flue gas is greatly improved. Therefore, the ZnO-coated hydrotalcite is an excellent smoke suppressant. After addition of the smoke suppressant, the smoke production amount of PVC is reduced by 70%.

Description

Technical field: [0001] The invention belongs to the technical field of plastic additives, in particular to a modified ZnO-coated hydrotalcite PVC smoke suppressant and a preparation method thereof. technical background: [0002] In 2016, a total of 312,000 fires were reported across the country, with 1,582 deaths, 1,065 injuries, and direct property losses of 3.72 billion yuan. Smoke is very harmful to the human body. According to some data, the casualties caused by lack of oxygen and smoke damage during a fire can reach 50-80% of the death toll in a fire. The smoke particles in the smoke have a complete shielding effect on visible light. When the smoke is diffused, the visible light is greatly weakened by the shadow of the smoke particles, and the visibility is greatly reduced. Moreover, the smoke is very irritating to people's eyes, making people unable to open their eyes. Open your eyes, people will affect the speed of travel during evacuation. The horror of smoke caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/04C08K9/06C08K3/22C08K3/26C08K3/32C08K3/28C08K3/38
CPCC08K3/22C08K3/26C08K3/28C08K3/32C08K3/38C08K9/04C08K9/06C08K2003/2296C08L27/06
Inventor 林彦军都魁林宿磊李凯涛孙鹏
Owner 山东万新威纳材料科技有限公司