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Quantitative characteristic testing method for strain frozen of PVC profile material

A polyvinyl chloride, characterization testing technology, applied in the field of characterization testing of physical and chemical parameters, can solve problems such as unsure and effective control of low temperature drop punching, and achieve the effect of solving the quality fluctuation of profiles

Inactive Publication Date: 2005-06-08
陈伟瑜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is still not sure to effectively control the key performance of low-temperature drop

Method used

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  • Quantitative characteristic testing method for strain frozen of PVC profile material
  • Quantitative characteristic testing method for strain frozen of PVC profile material
  • Quantitative characteristic testing method for strain frozen of PVC profile material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Polyvinyl chloride profile formula:

[0046] PVC (K=68, No. 2 Beijing Chemical Factory) 100 parts by weight

[0047] Active light calcium carbonate (average particle size 5-10 μm, commercially available) 10 parts by weight

[0048] Titanium dioxide (rutile type, U.S. DuPont) 4 parts by weight

[0049] Chlorinated polyethylene (Cl content 36% by weight, Shandong Weifang Chemical Factory) 9 parts by weight

[0050] Acrylic ester processing aid (ACR-401, Suzhou Amway Chemical Factory) 2 parts by weight

[0051] Rare earth stabilizer (GKD-200A, Shantou Gao Keda Company) 3.5 parts by weight

[0052] Use the same twin-screw extruder according to the above formula and the same extrusion temperature to produce two batches of profiles A and B. The above-mentioned profile strain freezing test method is used to test two batches respectively, in which the thickness of the sample is 4.0±0.1mm, and a single incision is taken in the middle of the frame of the main chamber. Then c...

Embodiment 2

[0056] Except that the heat treatment temperature is 150° C., all the other conditions are the same as in Example 1. The test results are shown in Table 2.

[0057] Example 2-A

[0058] From the results measured in Examples 1 and 2, it can be seen that the heat treatment temperature is 150°C and 180°C, and the deformation is basically similar. Because the sample has far exceeded the glass transition temperature (80°C) of polyvinyl chloride at 150°C, the movement of its macromolecules, chain segments, and crystallites has reached a fully saturated level. Therefore, even if the heat treatment temperature is increased to 180 °C, the deformation amount of the sample does not change significantly.

Embodiment 3

[0060] Polyvinyl chloride profile formula:

[0061] PVC (with embodiment 1) 100 parts by weight

[0062] Active light calcium carbonate (average particle size 1-12 μm, commercially available) 9 parts by weight

[0063] Titanium dioxide (with embodiment 1) 4 parts by weight

[0064] Chlorinated polyethylene (with embodiment 1) 10 parts by weight

[0065] Acrylic ester processing aid (same as embodiment 1) 2.5 parts by weight

[0066] Rare earth stabilizer (with embodiment 1) 3.5 parts by weight

[0067] Using the same twin-screw extruder according to the above recipe, two batches of profiles C and D were produced. The body temperature of the two groups of batches is 150-175°C during extrusion, and the temperature of the head and mold is different. The temperature of the extrusion head and mold of batch C is 180-196°C, and the temperature of extrusion head and mold of batch D is 2-5°C lower than that of batch C.

[0068] Strain freeze tests were performed on the above two ...

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Abstract

The invention provides a characterization test method for strain freezing of polyvinyl chloride profiles, and the characterization and measurement of stress changes during profile extrusion. The strain freezing quantitative characterization test method of the present invention includes taking the deformation amount of the profile after it is placed at a constant temperature higher than the glass transition temperature as the value representing the degree of strain freezing of the profile. The method includes the following steps: a. Cut the profile horizontally to make a sample; b. Select the frame of the chamber at any position on the sample to make a cut; Place the deformation under constant temperature conditions, and then take the sample out to cool, and take the change in the distance between the two fractures at the tangent point as the profile deformation, that is, the value of the strain freezing degree of the profile. The characterization test method of the present invention can simply, effectively and accurately measure the value of "strain freezing", and can play a very good guiding and reference role in the design of profile extrusion process.

Description

technical field [0001] The invention relates to a characterization test method of physical and chemical parameters in the plastic extrusion molding process, and furthermore, relates to a quantitative characterization test method of strain freezing of polyvinyl chloride profiles. Background technique [0002] For a long time, in the extrusion process of PVC profiles, it has often appeared that the profiles extruded with the same formula and the same process parameters have some key properties (such as -10°C drop hammer impact, heat distortion temperature, etc.) Although they are the same, sometimes there will be great differences, and even affect the performance of the profiles. This phenomenon has seriously affected the control and guarantee of the quality of polyvinyl chloride profiles by many profile manufacturers, and has deeply troubled the producers of various enterprises. There are many factors that affect performance such as low-temperature impact, but the influence ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/00G01N33/44
Inventor 杨冬麟陈伟瑜朱东平
Owner 陈伟瑜
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