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Composition with improved low-temperature flexibility and elasticity

A composition and elastic technology, applied in the manufacture of door seal plastic sleeves for refrigerated products, refrigerated products, PVC composition field, can solve unacceptable, expensive, and unmanufactured problems

Inactive Publication Date: 2009-12-30
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the prior art, a kind of 40 parts by weight of nitrile rubber (NBR) modified PVC can meet the above-mentioned requirements, but its price is expensive and unacceptable
[0005] To date, cost-effective PVC compositions with improved low temperature flexibility and elasticity have not been produced in the prior art

Method used

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  • Composition with improved low-temperature flexibility and elasticity
  • Composition with improved low-temperature flexibility and elasticity
  • Composition with improved low-temperature flexibility and elasticity

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The product of the present invention can be prepared by the conventional preparation method used in this area, and the specific preparation method is as follows:

[0034] First, put all the raw materials except the modifier into a high-speed mixer for pre-mixing until the temperature rises to 110°C, and the material is in a semi-plasticized state; then, move the mixed semi-plasticized material into a low-speed mixer In the mixer, add the modifier, cool to 50°C at the same time, and continue to stir for 2-3 minutes; send the mixed material into the single-screw extruder for granulation; add the plastic granules to another The final processing takes place in an extruder capable of making refrigerator weather strip profiles to obtain the final product.

[0035] The main advantages of the present invention are:

[0036] Compared with conventional PVC compositions containing NBR, the PVC composition of the present invention has much better hardness change rate and low tempe...

Embodiment 1

[0039] Example 1: Preparation and performance test of door seal plastic sleeve sample

[0040] preparation:

[0041] 1. Mixing: According to the following table 2, the corresponding raw materials listed in the following table 1 are blended in a Brabender (Brabender) mixer (manufactured by Brabender, Germany), and the mixing temperature is 150 ° C. Blending time was 5-8 minutes.

[0042] 2. Preparation of the sample: The blended material taken out of the Brabender mixer was placed in a mold and pressed into tablets with a hot press (process conditions: 15Mpa, 150°C, 8 minutes). According to the needs of experimental testing, different punching knives are selected to cut the pressed sheet into required samples for the next step of testing.

[0043] Table 1

[0044] raw material

Manufacturer Chemical Name

pvc

Tianjin Bohai Chemical Co., Ltd. PVC SG-3 type

DOP

Nanjing Jinling Petrochemical Bis(2-ethylhexyl)phthalate

CaCO 3

Cha...

Embodiment 2

[0056] Example 2: Preparation and performance test of door seal plastic sleeve sample

[0057] preparation:

[0058] 1. Mixing: According to the following table 3, the corresponding raw materials listed in the above table 1 were blended in a Brabender mixer, the mixing temperature was 150°C, and the blending time was 5-8 minutes.

[0059] 2. Preparation of the sample: The blended material taken out of the Brabender mixer was placed in a mold and pressed into tablets with a hot press (process conditions: 15Mpa, 150°C, 8 minutes). According to the needs of experimental testing, different punching knives are selected to cut the pressed sheet into required samples for the next step of testing.

[0060] Performance Testing:

[0061] 1. Plastic tensile property test: according to ISO 527-2.

[0062] 2. Plastic Shore Hardness Test: According to GB / T2411-1980.

[0063] Hardness change rate:

[0064] Shore hardness 1 test temperature: 23-26 ℃; 15 seconds reading.

[0065] S...

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Abstract

The invention provides a composition with improved low-temperature flexibility and elasticity, comprising the components in parts by weight: 30-50 parts of polyvinyl chloride, 20-35 parts of plasticizing agent and 1-15 parts of modifying agent, wherein the modifying agent is selected from an ethane / acrylic ester multipolymer or trimer and an ethane / vinyl acetate multipolymer or trimer. The invention also relates to an application of the composition for manufacturing a door-seal plastic sleeve of refrigerated products and refrigerated products containing the composition.

Description

technical field [0001] The present invention relates to a new polyvinyl chloride (PVC) composition. In particular, it relates to a PVC composition having improved low temperature flexibility and elasticity. The present invention also relates to the application of the composition in the manufacture of plastic door seals for refrigerated products, and the refrigerated products containing the composition. Background technique [0002] In the current PVC market, more and more applications require low temperature flexibility and elasticity. However, so far, no cost-effective solution has been proposed in the prior art. [0003] For example, for an application where the end use is in a refrigerator door, if the PVC seal in the refrigerator door is not sufficiently flexible and elastic (compression set), cold air in the refrigerator will leak, causing efficiency issues for the refrigerator. For better energy saving, refrigerator users hope that the surface hardness and elasticit...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L23/08C08L73/00C08K5/12F25D23/08
Inventor 应磊刘畅冯嘉张大为
Owner EI DU PONT DE NEMOURS & CO
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