Zinc-based heat stabilizer for polyvinyl chloride, composition with same and application of zinc-based heat stabilizer for polyvinyl chloride

A polyvinyl chloride, zinc-based heat technology, applied in the field of PVC heat stabilizers, can solve the problems of vicious degradation of PVC samples, reduced HCl removal rate, poor long-term thermal stability, etc., and achieves low production cost, simple process operation, comprehensive Good thermal stabilization effect

Active Publication Date: 2015-11-25
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, although the traditional zinc-based heat stabilizers can effectively inhibit the initial degradation and coloring, the conversion product ZnCl 2 It is also a catalyst for PVC to remove HCl, which will cause malignant degradation of PVC samples and make the material suddenly black, that is, "zinc burning". Therefore, the long-term thermal stability of traditional zinc-based heat stabilizers is relatively poor. Composite use of calcium-based heat stabilizers with good long-term thermal stability
[0004] Mohamed et al. studied the heat stabilization effect of a series of phenylurea and phenylthiourea derivatives as PVC heat stabilizers (SabaaMW, MohamedRR, YassinAA. Organicthermalstabilizersforrigidpoly(vinylchloride) VIII.Phenylureaandphenylthioureaderivatives[J]. 1): 37-45.

Method used

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  • Zinc-based heat stabilizer for polyvinyl chloride, composition with same and application of zinc-based heat stabilizer for polyvinyl chloride
  • Zinc-based heat stabilizer for polyvinyl chloride, composition with same and application of zinc-based heat stabilizer for polyvinyl chloride
  • Zinc-based heat stabilizer for polyvinyl chloride, composition with same and application of zinc-based heat stabilizer for polyvinyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Biuret-zinc synthesis reference (Zang Qing, Wang Meiling, Zhong Guoqing. Synthesis and characterization of biuret-based complexes. Fine Chemical Industry, 2015,32(7):768-771.) and optimize the method : Dissolve 0.02mol of biuret in 150mL of ethanol at 60°C, add 0.01mol of anhydrous zinc acetate under stirring, keep the temperature and stirring state unchanged, react for 6h, filter and separate to obtain the crude product, and then wash with ethanol and deionized water Twice, dry at 60°C for 3 hours to obtain a white powder, which is recorded as biuret-zinc. ICP analysis zinc content is 22%, infrared absorption spectrum data (cm -1 KBr tablet): 3778(w), 3571(w), 3405(m), 3351(w), 3225(m), 2925(w), 2359(w), 1711(s), 1565(m), 1472(w), 1411(m), 1219(m), 1106(s), 779(m), 618(w), 552(w), 432(w), see XRD test results figure 1 .

Embodiment 2

[0025] Thiourea-zinc synthesis: Dissolve 0.03mol thiourea in 150mL ethanol, add 0.01mol anhydrous zinc acetate under stirring at room temperature, keep the temperature and stirring state unchanged, react for 4 hours, filter and separate to obtain the crude product, and then wash with ethanol Twice, dry at 60°C for 3 hours to obtain a white powder, which is recorded as biuret-zinc. ICP analysis zinc content is 24%, infrared absorption spectrum data (cm -1KBr tablet): 3379(m), 3305(m), 3192(m), 3099(m), 3052(m), 2752(w), 1646(s), 1592(s), 1505(m), 1398(s), 1332(m), 1132(w), 1035(w), 933(w), 779(m), 672(m), 605(w), 519(m), 479(m), 412 (m); proton nuclear magnetic resonance spectrum analysis result is: 1 HNMR (400MHz, DMSO) δ7.32 (br, 8H), 1.78 (s, 6H), XRD test results see figure 2 .

[0026] Mixing formula: 100g PVC resin, 20g dioctyl phthalate and 3g thiourea-zinc. Preparation, test method and data list are the same as application example 1.

Embodiment 3

[0028] Synthesis of thiourea dioxide-zinc: Dissolve 0.02mol thiourea dioxide in 150mL 55°C deionized water, add 0.01mol anhydrous zinc acetate under stirring, keep the temperature and stirring state unchanged, react for 6h, and vacuum rotary evaporate 100mL solvent at 70°C, The crude product was isolated by filtration, washed twice with deionized water, and dried at 70°C for 3 hours to obtain a white powder, which was designated as thiourea-zinc dioxide. ICP analysis zinc content is 23%, infrared absorption spectrum data (cm -1 KBr tablet): 3364(s), 3251(m), 3171(s), 2964(w), 1638(s), 1565(s), 1498(w), 1405(m), 1279(w), 1219(m), 1125(m), 1005(m), 806(m), 650(w), 605(w), 460(w), see XRD test results image 3 .

[0029] Mixing formula: 100g PVC resin, 50g dioctyl phthalate and 1g thiourea-zinc dioxide. Preparation, test method and data list are the same as application example 1.

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Abstract

The invention relates to zinc-based heat stabilizer for polyvinyl chloride, a composition with the same and an application of the zinc-based heat stabilizer for polyvinyl chloride. The zinc-based heat stabilizer is prepared from urea organic matter and zinc salt through a liquid phase reaction. According to the composition independently prepared from the zinc-based heat stabilizer or prepared by mixing the zinc-based heat stabilizer, calcium carboxylate, beta-diketone, phosphite ester and polyhydric alcohols raw materials, the thermal stability of PVC can be effectively improved. The raw materials of the zinc-based heat stabilizer are easy to obtain, the synthetic process is simple, industrial application prospects are achieved, and the zinc-based heat stabilizer has the important guiding function on research and development of novel urea heat stabilizer.

Description

technical field [0001] The invention belongs to the technical field of PVC (polyvinyl chloride) heat stabilizers, and in particular relates to a zinc-based heat stabilizer and a composition. Background technique [0002] PVC is one of the polymers with the earliest industrial production time and the widest application field in the world, and is widely used in various fields of industry and agriculture. However, PVC resin is also one of the polymers with the worst thermal stability and the most prone to degradation. It begins to thermally degrade at 120°C, releasing toxic gases (mainly hydrogen chloride), and the color of the product turns red until completely black. The mechanical properties deteriorate and eventually lose the use value, so this defect greatly limits the application field of PVC. In order to effectively avoid the degradation phenomenon of PVC in the process of processing and application, the more common practice in industrial production is to add PVC during ...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08K5/00C08K5/21C08K5/372C08K5/12C08K5/098C08K5/526
Inventor 邱晨姚有为李帅
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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