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Superfine calcium carbonate modified polypropylene resin with stress whitening resistance and preparation method thereof

A polypropylene resin and ultra-fine calcium carbonate technology, applied in the field of polymer materials, can solve the problems of poor stress crack resistance, reduced elongation at break, affecting product use, etc., to enhance mechanical strength and prevent stress whitening. , the effect of high production efficiency

Inactive Publication Date: 2018-01-05
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stress whitening of the product not only affects its appearance, but also leads to lower elongation at break, lower strength and poor stress cracking resistance of the product, which seriously affects the use of the product

Method used

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  • Superfine calcium carbonate modified polypropylene resin with stress whitening resistance and preparation method thereof
  • Superfine calcium carbonate modified polypropylene resin with stress whitening resistance and preparation method thereof
  • Superfine calcium carbonate modified polypropylene resin with stress whitening resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) with 85 parts of polypropylene resin, 15 parts of 6000 purpose superfine calcium carbonate, 5 parts of glass fibers, 0.2 part of antioxidant 1010, 0.3 part of light and heat stabilizer (antioxidant 1076: antioxidant 168=1: 2, mass ratio) and 0.1 part of lubricant stearic acid amide (SR) are mixed evenly by high-speed stirring;

[0033] (2) sending the above mixture into a twin-screw extruder to extrude and granulate to obtain polypropylene resin;

[0034] The screw temperature of the twin-screw extruder is 220° C.; the screw speed is 100 r / min.

[0035] The prepared compound was injection-molded into a standard sample bar for testing according to the standard size, and the performance test results are shown in Table 2.

Embodiment 2

[0037] (1) 98 parts of polypropylene, 2 parts of 7000 mesh ultrafine calcium carbonate, 10 parts of glass fiber, 0.5 part of antioxidant 1010, 0.6 part of light and heat stabilizer (DLTP:DBTL=1:1, mass ratio) and 0.5 One part lubricant silicone oil is mixed evenly by high-speed stirring;

[0038] (2) sending the above mixture into a twin-screw extruder to extrude and granulate to obtain polypropylene resin;

[0039] The screw temperature of the twin-screw extruder is 230° C.; the screw speed is 200 r / min.

[0040] The prepared compound was injection-molded into a standard sample bar for testing according to the standard size, and the performance test results are shown in Table 2.

Embodiment 3

[0042] (1) 90 parts of polypropylene resin, 10 parts of 6000 mesh ultrafine calcium carbonate, 30 parts of glass fiber, 1 part of antioxidant 1010, 0.1 part of light and heat stabilizer (DLTP: 2,6-tertiary butyl-4 -methylphenol=2:1, mass ratio) and 1 part of lubricant EBS are mixed evenly by high-speed stirring;

[0043] (2) sending the above mixture into a twin-screw extruder to extrude and granulate to obtain polypropylene resin;

[0044] The screw temperature of the twin-screw extruder is 240° C.; the screw speed is 400 r / min.

[0045] The prepared compound was injection-molded into a standard sample bar for testing according to the standard size, and the performance test results are shown in Table 2.

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Abstract

The invention discloses a superfine calcium carbonate modified polypropylene resin with stress whitening resistance and a preparation method thereof. The superfine calcium carbonate modified polypropylene resin with stress whitening resistance is prepared from the following components by mass: 8-98 parts of polypropylene resin, 2-20 parts of superfine calcium carbonate, 5-30 parts of glass fiber,0.2-1 part of an antioxidant, 0.1-1 part of a photothermal stabilizer, and 0.1-1 part of a lubricant. According to the invention, superfine calcium carbonate is selected for modification of specific polypropylene resin, superfine calcium carbonate has high activity and easily combines with the polypropylene resin to form an "island structure", which can absorb a large number of micro cracks formedby crazing generated under the action of an external force so as to prevent further development of cracks, and then stress whitening phenomenon of polypropylene resin can be slow downed or prevented.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an ultrafine calcium carbonate modified polypropylene resin resistant to stress whitening and a preparation method thereof. Background technique [0002] At present, polypropylene resin is a very commonly used polymer material, and its application range is very wide. However, when its products are subjected to external forces such as stretching, bending, and impact during use, local whitening often occurs. Said stress whitish. Stress whitening of the product not only affects its appearance, but also leads to lower elongation at break, lower strength and worse stress cracking resistance of the product, which seriously affects the use of the product. [0003] At present, the more common solution to the stress whitening of polypropylene resin products is to heat-treat the products, that is, to place the products under certain temperature conditions for post-tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L83/04C08L91/06C08K13/04C08K7/14C08K3/26C08K5/134C08K5/526B29C47/92B29C48/92
Inventor 杨桂生李晓庆乐俊姚晨光
Owner HEFEI GENIUS NEW MATERIALS
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