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Method for determining stability of PVC heat stabilizer

A heat stabilizer and stability technology, applied in the detection field, can solve the problems of inability to make judgments on the change trend and process of stabilizer stability, troublesome instrument cleaning, and time-consuming, etc., to achieve easy promotion, simple evaluation method, and operation method simple effect

Inactive Publication Date: 2012-07-18
湖北犇星新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The document "Application of HAAKE Torque Rheometer in the Formula Design of Polyvinyl Chloride Processing" (Qilu Petrochemical, 2003, 31(2): 147-148, author Gao Xiangtao, Sinopec Qilu Co., Ltd. Chlor-Alkali Plant), reported the The main disadvantage of this method is that it only judges the length of the stability time of the heat stabilizer, but the change of the stability of the stabilizer during processing and use The trend and process cannot be judged, and this method takes a lot of time, and it is very troublesome to clean up the instrument after the experiment
[0004] Document "Application Research of New Heat Stabilizers and Various Auxiliary Heat Stabilizers in Rigid PVC" (Plastic Industry, February 2009, Volume 37, Issue 22, author Jiang Yiwen, etc., Qingdao University of Science and Technology, College of Chemical Engineering), reported The Congo red experiment and oven aging test of heat stabilizer have been carried out, but these two methods have defects, they can only evaluate the static thermal stability of PVC heat stabilizer, and for PVC processing process, the dynamic stability of heat stabilizer more important

Method used

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  • Method for determining stability of PVC heat stabilizer
  • Method for determining stability of PVC heat stabilizer
  • Method for determining stability of PVC heat stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the formula 100g DG-800PVC resin powder (brand name of Tianjin Dagu Chemical Industry), 6.2g additives (including: 0.4g pentaerythritol adipate, 0.5g methyl methacrylate and acrylate copolymer, 4g methyl methacrylate -butadiene-styrene copolymer, 0.8g fatty acid pentaerythritol ester), 1g mercaptan methyl tin stabilizer (sample one), stir on the mixer for 20s, weigh 65g in a weighing cup. The rheometer experiment can be started when the temperature of the torque rheometer (XSS-300 rheometer, Shanghai Kechuang Rubber and Plastic Machinery Equipment Co., Ltd.) is stable, and the material is pressed into the mixing device, and the rheometer software displays When the time reaches 3 minutes, use tweezers to pick up a little PVC melt in the mixing device, put it into the pliers pressing groove and quickly press the pliers to cool and form the melt, and use scissors to remove the overflowing edge around the circular sample. After that, the material was taken ever...

Embodiment 2

[0033] The methyl tin mercaptide stabilizer (sample one) in Example 1 is replaced with a polyester tin stabilizer (sample two), and the other testing methods are the same as in Example 1. The measured B values ​​are shown in Table 1.

[0034] In addition, the B value that embodiment 1 and embodiment 2 measure is made B value-time schematic diagram, as figure 1 shown.

[0035] The B value that records in table 1, embodiment 1 and embodiment 2

[0036]

[0037] as table 1 and figure 2 As shown, the B values ​​of sample 1 and sample 2 both increased with time, and the stability of sample 1 and sample 2 decreased with time, and the B value of sample 1 when sampling at 3min and 5min The value of B is greater than that of sample two, and the B value after 5 minutes is smaller than that of sample two. It can be concluded that the initial stability of sample one is better than that of sample two, but its long-term stability is worse than that of sample two.

Embodiment 3

[0039] According to the formula, 100g DG-1000PVC resin powder (brand name of Tianjin Dagu Chemical Industry), 12.3g additives (including: 0.3g polyethylene wax, 1g titanium dioxide, 0.1g oxidized polyethylene wax, 0.6g paraffin wax, 0.3g calcium stearate , 10g calcium carbonate), 6g reverse ester tin stabilizer TS-107 (produced by Hubei Hoko Star Chemical Industry) batching, stirred on the mixer for 45s, weighed 65g in the weighing cup. The rheometer experiment can be started when the temperature of the torque rheometer (XSS-300 rheometer, Shanghai Kechuang Rubber and Plastic Machinery Equipment Co., Ltd.) is stable, and the material is pressed into the mixing device, and the rheometer software displays When the time reaches 4 minutes, use tweezers to pick up a little melt in the mixing device, put it into the pliers pressing groove and quickly press the pliers to cool and form the melt, use scissors to remove the overflowing edge around the circular sample, and then The mater...

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Abstract

The invention relates to a method for determining the stability of PVC heat stabilizer, which particularly includes the following steps: (1) adding the to-be-determined heat stabilizer into PVC to be uniformly mixed, so as to be added into a rheometer; (2) sampling from the rheometer every 1 to 2min after the rheometer is balanced, so as to determine the B value in the color values; and (3) judging the stability according to the B value. The detecting method is straightforward, simple and practical, and can effectively judge the heat stability of the heat stabilizer.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for measuring the stability of a PVC heat stabilizer. Background technique [0002] PVC is a polymer that is prone to thermal degradation, and its processing and molding process is inseparable from heat stabilizers. However, the stabilization mechanism of heat stabilizers on PVC processing is still unclear, and many complex Chemical and physical reactions, pure theoretical analysis and simple chemical analysis experiments are difficult to compare the effect of two stabilizers in the process of processing. However, the degradation process of PVC is accompanied by its color change, which provides a basis for judging the stabilization effect of heat stabilizers. [0003] The document "Application of HAAKE Torque Rheometer in Formula Design of Polyvinyl Chloride Processing" (Qilu Petrochemical, 2003, 31(2): 147-148, author Gao Xiangtao, Chlor-Alkali Plant of Sinopec Qilu Co., Ltd. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 戴百雄宫廷吴勇徐善武许继学蒋俊罗斌
Owner 湖北犇星新材料股份有限公司
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