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Special-purpose material for high-strength high-ductility high-fluidity rotational molding and preparation method thereof

A high-fluidity, high-strength and high-toughness technology, applied in the chemical industry, can solve the problems of less special materials for rotomolding, brittle products, and reduced material toughness, etc., and achieve the effects of excellent comprehensive performance, simple process flow and broad application prospects.

Active Publication Date: 2008-09-17
NANJING JULONG SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Rotational molding is an important plastic processing mode. At present, there is no special rotomolding material for production in China. Most manufacturers choose LLDPE imported from abroad for rotomolding processing. For some large parts that require thin wall and high rigidity, the current grades cannot meet the quality or cost requirements
[0004] CN1036392A discloses a method of adding 1%-50% filler to the rotomolding base material for granulation processing, mentioning that the rigidity (tensile strength) of the material can be improved, but no specific manufacturing method and The effect of improving rigidity, from theoretical analysis, this simple method of adding fillers will greatly reduce the toughness of the material, causing the product to become brittle and lose its use effect
Some people use ultrasound, but it is difficult to achieve large-scale production; some people use maleic anhydride grafted PE for secondary granulation, but it brings weaknesses such as odor that cannot be eliminated. No one has yet make public reports

Method used

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  • Special-purpose material for high-strength high-ductility high-fluidity rotational molding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] formula:

[0045] (A) linear low-density polyethylene PE500U of 60% by mass;

[0046] (B) irradiated high-density polyethylene PE5000S with a mass percentage of 19.2%;

[0047](C) Nano-montmorillonite DK-4 of 20% by mass;

[0048] (D) MDBS TM-5 with a mass percentage of 0.8%.

[0049] The above-mentioned components are prepared by the following process methods for rotomolding special materials:

[0050] 1. Raw material processing

[0051] Under the process conditions of rotating speed of 5000 rpm and grinding disc temperature of 65°C, grind high-density polyethylene PE5000S in a plastic mill into a powder of 35 mesh or more, put it in a closed container, and heat it to 60°C At the same time, the air in the container was replaced by ozone, and the ultraviolet irradiation device was turned on for 20 minutes to obtain irradiated high-density polyethylene PE5000S.

[0052] 2. Masterbatch manufacturing

[0053] Pour the B, C and D weighed according to the above ratio i...

Embodiment 2

[0060] formula:

[0061] (A) linear low-density polyethylene PE500U of 90% by mass;

[0062] (B) 9.5% by mass irradiated high-density polyethylene PE5000S;

[0063] (C) Nano-montmorillonite DK-4 with a mass percentage of 0.5%.

[0064] The above-mentioned components are prepared by the following process methods for rotomolding special materials:

[0065] 1. Raw material processing

[0066] Under the process conditions of rotating speed of 3200 rpm and grinding disc temperature of 50°C, grind high-density polyethylene PE5000S in a plastic mill into a powder of 35 mesh or more, put it in a closed container, and heat it to 40°C , and at the same time replace the air in the container with ozone, turn on the ultraviolet irradiation device and treat for 10 minutes to obtain irradiated high-density polyethylene PE5000S.

[0067] 2. Masterbatch manufacturing

[0068] Pour the B and C weighed according to the above ratio into a plastic mixer, fully mix under the process conditions...

Embodiment 3

[0075] formula:

[0076] (A) 65% linear low density polyethylene PE500U by mass percent;

[0077] (B) irradiated high-density polyethylene PE5000S with a mass percentage of 27.65%;

[0078] (C) Nano-montmorillonite DK-4 of 7% by mass;

[0079] (D) MDBS TM-5 with a mass percentage of 0.35%.

[0080] The above-mentioned components are prepared by the following process methods for rotomolding special materials:

[0081] 1. Raw material processing

[0082] Under the process conditions of rotating speed of 4000 rpm and grinding disc temperature of 55°C, grind high-density polyethylene PE5000S in a plastic mill into a powder of 35 mesh or more, put it in an airtight container, and heat it to 50°C At the same time, the air in the container was replaced by ozone, and the ultraviolet irradiation device was turned on for 20 minutes to obtain irradiated high-density polyethylene PE5000S.

[0083] 2. Masterbatch manufacturing

[0084] Pour the B, C and D weighed according to the abo...

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Abstract

The invention discloses a high-strength, high-tenacity and high-flow special-purpose material for rotational molding, and a preparation method thereof. The special-purpose material for rotational molding consists of the following components by weight percentages as follows: linear low density polyethylene 60%-90%; irradiated HDPE 9.5%-19.2%; nanometer montmorillonite 0.5%-20%; and a nucleating agent 0%-0.8%. The high strength, high-tenacity and high-flow special-purpose material for rotational molding can meet the requirement of the manufacturing process of rotational molding with the tensile strength reaching 20 to 28.2MPa, the flexural modulus reaching 810MPa to 1460MPa, the impact strength reaching 40KJ / m<2> to 70KJ / m<2>, and the melt flow rate reaching 6.1g / 10 minutes to 14.5g / 10 minutes. The special-purpose material for rotational molding provides a novel raw material with excellent overall performance for the rotational molding field, and is vital in the application field of large rotational molded products and rotational molded products in complicated shapes. The process flow adopted by the invention is simple with controllable cost, and has wide application prospect.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a high-strength, high-toughness and high-fluidity special material suitable for rotational molding technology and a preparation method thereof. Background technique [0002] Rotational molding, also known as rotational molding, is one of the techniques for producing hollow plastic products. The basic process is to put a certain amount of powdery resin into the mold, and rotate the mold around two mutually perpendicular axes while heating the mold, so that the resin is melted and evenly coated on the surface of the mold cavity by gravity. Finally, the product is obtained after cooling and demoulding. Most of the rotational molding process uses special linear low density polyethylene (LLDPE) materials for production. [0003] Rotational molding is an important plastic processing mode. At present, there is no special rotomolding material for production in China. Most manufacturers c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04C08K5/053C08J3/28B29C47/40B29C47/92B29B9/12C08K3/34B29C48/92
CPCB29C47/92
Inventor 温原吴汾蒋顶军
Owner NANJING JULONG SCI&TECH CO LTD
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