Transparent cold resistance high melt-strength polypropylene material used for automobile expansion water tank and its preparation method

A high-melt-strength, polypropylene material technology, applied in the field of polypropylene material modification, can solve the problems of not being able to meet the needs of automobile expansion tanks, complex equipment and production steps, and insufficient low-temperature toughness, etc., and achieve low damage rate and melt Strength Transparency and easy blow molding

Inactive Publication Date: 2012-06-13
NANJING HONGRUI PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the best notched impact strength at low temperature (-20°C) in the examples is only 3.9KJ / m 2 , far from meeting the needs of automobile expansion tanks in cold weather in northern my country
Chinese Patent No. ZL200410013826.8 discloses a method for preparing a transparent high-melt-strength polypropylene resin. The method of segmental polymerization is adopted to make the polypropylene resin contain a certain amount of ultra-high molecular weight polypropylene, and the melt strength is relatively high. However, the low temperature toughness is not enough, and the equipment and production steps are relatively complicated, so it is not suitable for general blending and modification enterprises

Method used

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  • Transparent cold resistance high melt-strength polypropylene material used for automobile expansion water tank and its preparation method
  • Transparent cold resistance high melt-strength polypropylene material used for automobile expansion water tank and its preparation method
  • Transparent cold resistance high melt-strength polypropylene material used for automobile expansion water tank and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A transparent, cold-resistant and high-melt-strength polypropylene material for an automobile expansion tank, mainly composed of the following raw materials:

[0017]

[0018] Weigh polypropylene, cold-resistant and toughening agent, cross-linking agent, styrene, antioxidant and lubricant in a high-speed mixer and mix them uniformly in a high-speed mixer, and then melt, blend, react, extrude and granulate in a twin-screw extruder. The process conditions of the extruder are: the temperature of the 1-2 zone of the twin-screw extruder is 160-190°C, the temperature of the 3-4 zone is 210-230°C, the temperature of the 5-6 zone is 220-240°C, and the temperature of the 7-8 zone The temperature is 220-230°C, the head temperature is 210-220°C, and the screw speed is 300-350 rpm. The obtained extruded pellets were dried and then injection-molded into standard specimens to test their properties. The results are shown in Table 1.

[0019] Table 1 embodiment 1 gained material pe...

Embodiment 2

[0022] A transparent, cold-resistant and high-melt-strength polypropylene material for an automobile expansion tank, mainly composed of the following raw materials:

[0023]

[0024] The preparation steps are the same as in Example 1.

[0025] The obtained extruded pellets were dried and injection-molded into standard specimens, and their properties were tested. The results are shown in Table 2.

[0026] Table 2 embodiment 2 gained material properties test result

[0027]

[0028]

Embodiment 3

[0030] A transparent, cold-resistant and high-melt-strength polypropylene material for an automobile expansion tank, mainly composed of the following raw materials:

[0031]

[0032] The preparation steps are the same as in Example 1.

[0033] The obtained extruded pellets were dried and injection-molded into standard specimens, and their properties were tested. The results are shown in Table 3.

[0034] Table 3 embodiment 3 gained material properties test result

[0035]

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Abstract

The invention provides a transparent cold resistance high melt-strength polypropylene material used for an automobile expansion water tank and its preparation method. The material comprises the following components by weight percentage: 88-95% of polypropylene, 3-10% of cold resistant flexibilizer, 0.05-0.1% of cross-linking agent, 1-3% of auxiliary crosslinking agent, 0.1-0.3% of anti-oxidant and 0.3-1% of lubricant. According to the invention, transparent random copolymerized polypropylene is taken as matrix, SEBS is taken as a cold resistant flexibilizer, by reaction and extrusion, polypropylene and SEBS are performed microcrosslinking compatibilization, the transparency of polypropylene can be kept, the cold resistance and melt-strength can be increased. The polypropylene material can be taken as a material for producing the automobile blow molding expansion water tank.

Description

technical field [0001] The invention belongs to the technical field of polypropylene material modification, and in particular relates to a transparent cold-resistant high-melt strength polypropylene material for an automobile expansion water tank and a preparation method thereof. Background technique [0002] The expansion water tank of an automobile is a functional part with high requirements. It must not only have a certain degree of transparency to see the water level of the refrigerant, but also meet the high temperature requirements of the engine cooling system and withstand the test of the external climate. Therefore, it is required to operate at -40°C~ The performance is stable between 120°C, and it should also withstand the test of overpressure up to 100kPa and underpressure up to 4kPa in the box. In addition, the blow-molded automobile expansion water tank is a large-scale blow-molded product, which requires high melt strength of the material, and the melt is not ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L53/02C08K5/14C08K5/01C08K5/098B29C47/92B29C48/92
CPCB29C48/40B29C48/875B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 张静志张明佘金牛
Owner NANJING HONGRUI PLASTIC PROD
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