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Method for detecting fusing degree of polyvinyl chloride or chlorinated polyvinyl chloride

A chlorinated polyvinyl chloride and polyvinyl chloride technology, which is applied in measuring devices, instruments, analytical materials, etc., can solve the problems of large experimental workload and high test results, and achieve simple operation steps, good test results repeatability, and experimental results. The effect of fewer operational factors

Active Publication Date: 2015-03-25
佛山顾地塑胶有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] This method is a better quantitative detection method, and can directly reflect the rheological properties of the sample, but for each formula of dry mixture, the inlet pressure drop of more than 5 pellets must be tested first, and the measured The obtained inlet pressure drop is used to make a reference curve for the corresponding granulation temperature, and the experimental workload is large.
In addition, this method will also produce post-fusion, that is, the sample is heated again in the capillary rheometer, and further fusion occurs, which makes the test result higher

Method used

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  • Method for detecting fusing degree of polyvinyl chloride or chlorinated polyvinyl chloride
  • Method for detecting fusing degree of polyvinyl chloride or chlorinated polyvinyl chloride
  • Method for detecting fusing degree of polyvinyl chloride or chlorinated polyvinyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Detection of each feature point in the PVC fusion process

[0059] Formula: 100 parts of PVC, 1.0 part of organotin stabilizer, 2.0 parts of titanium dioxide, 6.0 parts of chlorinated polyethylene, 0.8 part of calcium stearate, 0.6 part of paraffin, and 10 parts of calcium carbonate.

[0060] Put each component in the SHR-10A mixer and mix to 80°C to get the basic compound.

[0061] Use the RM-200A Harper rheometer, the test temperature is 185 ° C, the speed is 60, r / min.

[0062] Add 68 grams of the base compound into the torque rheometer, record the rheological curve, and read the minimum and maximum torque values.

[0063] Repeat the above test with the base compound, at the minimum torque a of the rheological curve, the middle point b from the minimum torque to the fusion torque, the fusion torque c, the melt torque e, and the d point between the fusion torque and the melt torque ( See Figure 5 .) Stop the machine, immediately take out the sample from ...

Embodiment 2

[0068] Embodiment 2 detects the fusion degree of the compounding material of different mixing time

[0069] A polyvinyl chloride profile, the formula (parts by mass) is PVC 100, calcium zinc stabilizer 4, ACR processing modifier 1, CPE impact modifier 7, titanium dioxide 7, calcium carbonate 12, oxidized polyethylene wax 0.2 , stearic acid 0.3.

[0070] Weigh the above-listed components according to a total amount of 70 grams, put them into a beaker, stir them evenly, and use them as basic compounding materials.

[0071] Weigh the various components of the above formula, use the DFT--250 traditional Chinese medicine pulverizer as a mixer, prepare samples with mixing times of 1 minute, 3 minutes, 5 minutes, and 7 minutes, and measure the time when the mixing is completed. The temperature of each compound.

[0072] Using RM-200A Harp Torque Rheometer, the test temperature is 190°C, and the speed is 35r / min.

[0073] All the samples added to the mixing chamber were 70 grams. ...

Embodiment 3

[0077] Embodiment 3. detect the fusion degree of a kind of PVC pipe material production compounding material

[0078] The formula of the pipe is (parts by mass) PVC 100, calcium zinc stabilizer 3, ACR processing modifier 1, MBS impact modifier 5, titanium dioxide 2, calcium carbonate 15, oxidized polyethylene wax 0.1, stearic acid 0.3 , Polyethylene wax 0.5.

[0079] Weigh various components according to the formula, use the DFT-250 traditional Chinese medicine pulverizer as a mixer, and mix for 1 minute as the basic compounding material.

[0080] Use RM-200A Harp torque rheometer, test temperature 180 ℃, speed 35r / min.

[0081] The compounding material for production is powder, and samples are taken in the production workshop as samples. The model of the mixing machine is GRH 300 / 500, and the temperature at the end point of mixing is 120°C.

[0082] All the samples added to the mixing chamber were 70 grams.

[0083] The fusion degree of the production compound is shown in ...

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Abstract

The invention discloses a method for detecting fusing degree of polyvinyl chloride or chlorinated polyvinyl chloride. The method is characterized by detecting the fusing degree of polyvinyl chloride (PVC) or chlorinated polyvinyl chloride (PVC-C) by using a torque rheometer method, and the method comprises the following steps of: weighing basic mixing materials according to the following formula of W=V*D*65%, wherein W is total weight of mixing materials, V is effective volume of a mixing chamber, D is flux density of the mixing materials in the formula; adding the mixing materials into a torque rheometer, and setting the temperature to be 150-210 DEG C and the rotation speed to be 20-100rpm; recording to obtain a flow curve 1#, and testing a sample to be detected under the same experimental conditions to obtain a flow curve 2#, wherein the particle size of the sample to be detected is 10-150Mu; and calculating the fuse degree Df of the sample according to the following formula (which is as shown in the description), wherein Torqs is the torque of the sample, and Toeqc is the torque of the basic mixing materials in the formula.

Description

technical field [0001] The invention relates to a method for detecting the fusion degree of polyvinyl chloride (PVC) or chlorinated polyvinyl chloride (PVC-C), specifically, it is produced when processing plasticized PVC or PVC-C by using a torque rheometer. The method for calculating the degree of fusion by torque belongs to the processing field of polymer materials. Background technique [0002] What happens during the processing of PVC or PVC-C is not the general plasticizing behavior of changing from glass state to viscous fluid state and using molecular chains as flow units, but rather complicated so-called fusion (Fusion) behavior. This fusion behavior makes another peak appear after the feeding peak of its torque rheological curve, the so-called fusion peak, which is a characteristic peak of PVC or PVC-C fusion behavior such as figure 1 .shown. figure 1 The curve below is the torque curve of the sample, and the curve above is the temperature curve of the sample. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00C08L27/06C08L27/24C08K3/22C08K3/26
Inventor 王文治赵侠郑德钱玉英黄进荣丁景新黄玉松卢振亮何国山王万卷潘永红
Owner 佛山顾地塑胶有限公司