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Supported PVC (polyvinyl chloride) heat stabilizer and preparation method thereof

A heat stabilizer, load-type technology, applied in the field of load-type PVC heat stabilizer and its preparation, can solve the problems of low alkali capacity, restriction of application range, decline, etc., achieve easy source, increase heat stability effect, and prepare easy effect

Active Publication Date: 2014-08-06
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent [Application (Patent) No.] ZL200510101332.X has announced alkaline calcium-based bentonite and its preparation method. The bentonite is prepared by a semi-dry method, which realizes the reaction of activated clay and calcium hydroxide, but due to the An acid active center only reacts with a calcium hydroxide molecule, and its alkali capacity is not high, so the scope of application is restricted; Preparation and research on the mechanism of fatty acid removal, the crystal layer of bentonite formed the acid active center after the acid activation treatment, and then used the wet method to load calcium hydroxide around the acid active center, and realized the multi-molecular layer loading, so that The alkali capacity of the product is doubled, and the solubility of the loaded calcium hydroxide is much lower than that of pure calcium hydroxide. This alkaline clay has a good effect in removing free fatty acids in oil, but it has not been reported to be applied to PVC heat stabilizers.

Method used

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  • Supported PVC (polyvinyl chloride) heat stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Stir and disperse activated clay with activity degree of 230, decolorization rate of 98, and particle size of 400 mesh in 12.5 times water for 0.5 hour to obtain activated clay suspension; disperse calcium hydroxide accounting for 67% of activated clay mass in 3 times 30°C Put it in water for 8 hours to obtain a calcium hydroxide emulsion; raise the temperature of the activated clay suspension to 75°C, add the calcium hydroxide emulsion evenly within 3 hours for loading, continue stirring for 1 hour after the addition, and then add 6.5% of the mass of activated clay stearic acid, stirred and reacted for 60 minutes; filtered, dried and pulverized to obtain a loaded PVC heat stabilizer.

[0023] The Ca(OH) of the loaded PVC heat stabilizer particles 2 The analysis results of content, activity index, particle size and thermal stability time are shown in Table 1.

Embodiment 2

[0025] The activated clay with activity degree of 230, decolorization rate of 98 and particle size of 400 mesh was stirred and dispersed in 12 times of water for 1 hour to obtain activated clay suspension; put 60% calcium hydroxide into calcium hydroxide mass 5 times of the water at 40°C, put it in water for 10 hours to obtain a calcium hydroxide emulsion; raise the temperature of the active clay suspension to 75°C, add the calcium hydroxide emulsion evenly within 3 hours for loading, continue stirring for 1 hour after the addition, and then Stearic acid with 4% mass of activated clay was added, stirred and reacted for 60 minutes; filtered, dried and pulverized to obtain a load-type PVC heat stabilizer.

[0026] The Ca(OH) of the loaded PVC heat stabilizer particles 2 The analysis results of content, activity index, particle size and thermal stability time are shown in Table 1.

Embodiment 3

[0028] The activated clay with activity degree of 230, decolorization rate of 98 and particle size of 700 mesh was stirred and dispersed in 15 times of water for 0.5 hour to obtain activated clay suspension; put 70% calcium hydroxide into calcium hydroxide mass 3 times the water of 50°C, put it in water for 10 hours to obtain a calcium hydroxide emulsion; raise the temperature of the activated clay suspension to 75°C, add the calcium hydroxide emulsion evenly within 3 hours for loading, continue stirring for 1 hour after the addition, and then Stearic acid with 4% mass of activated clay was added, stirred and reacted for 50 minutes; filtered, dried and pulverized to obtain a load-type PVC heat stabilizer.

[0029] The Ca(OH) of the loaded PVC heat stabilizer particles 2 The analysis results of content, activity index, particle size and thermal stability time are shown in Table 1.

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Abstract

A supported PVC (polyvinyl chloride) heat stabilizer is characterized in that the stabilizer takes activated clay as a supporter, an active component, namely, calcium hydroxide, is supported in the supporter, the surface is modified by fatty acid which is good in affinity with PVC, and a specific implementation method is as follows: the activated clay is stirred to be dispersed in water, then a calcium hydroxide emulsion is added for supporting, the fatty acid is added for modifying after supporting, and finally, the PVC heat stabilizer is obtained after filtration, drying and crushing. The stabilizer cannot release salt or organic matters to pollute the PVC after adsorbing hydrogenchloride and is non-toxic, odorless, safe, environment-friendly and easy to prepare, and raw materials are easy to obtain.

Description

technical field [0001] The invention relates to a load-type PVC heat stabilizer and a preparation method thereof. More specifically, it relates to a new type of PVC heat stabilizer with activated clay carrier loaded calcium hydroxide. Background technique [0002] PVC (polyvinyl chloride) is a thermoplastic polymer produced by the polymerization of vinyl chloride. Because its products have the advantages of easy control of hardness, good mechanical properties, corrosion resistance, good electrical insulation, high transparency and low price, etc., It is widely used in construction, light industry, chemical industry, electronics, aerospace, automobile, agriculture and other fields. However, PVC is prone to thermal degradation during processing, producing hydrogen chloride, and hydrogen chloride has the effect of catalyzing and accelerating degradation. Therefore, it is usually necessary to add heat stabilizers to inhibit thermal degradation and improve the performance of PV...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08K9/12C08K9/04
Inventor 韦藤幼黄克磊唐艳秀童张法
Owner GUANGXI UNIV
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