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A closed-cell foaming process of sebs/eva blend material

A process method and closed-cell technology, which is applied in the field of closed-cell foaming of SEBS/EVA blended materials, can solve the problems of product color difference, poor plasticization, black spots, etc., and achieves easy operation, low product processing cost, and process steps. less effect

Active Publication Date: 2017-11-17
湖北顶铭环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The purpose of the present invention is to improve the existing technology, to overcome many problems such as black spots on the surface or inside of the particles, product color difference, poor plasticization, carbonization, etc. existing in the existing technology, and to propose a new SEBS / EVA blend material Closed-cell foaming process; granulation by the method of the present invention completely eliminates the black spots on the surface or inside of the particles, the product is uniform in color, the tensile strength, elongation at break, and tear strength all increase significantly, and the hardness decreases. Various physical performance indicators have been significantly improved

Method used

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  • A closed-cell foaming process of sebs/eva blend material
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  • A closed-cell foaming process of sebs/eva blend material

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A kind of SEBS / EVA blended material closed-cell foaming process of the present invention comprises the following steps:

[0061] ①Batching and low speed mixing

[0062] Take 26 parts by weight of SEBS and 50 parts by weight of white mineral oil and mix them in a low-speed mixer, control the speed at 1455 rpm, mix at a temperature of 40°C, and take 12 minutes to fully mix and absorb SEBS powder and white mineral oil;

[0063] ②Stay

[0064] Place the above-mentioned mixture in the trough and let it stand for 48 hours, so that the SEBS powder can further absorb white mineral oil;

[0065] ③High-speed mixing

[0066] Put the SEBS powder that has fully absorbed white mineral oil in a high-speed mixer, control the speed at 2850 rpm, mix at a temperature of 65°C, and mix for 8 minutes; the SEBS high-mixture is obtained;

[0067] ④ Banbury

[0068] Get above-mentioned SEBS high compound 40 weight parts, Vinyl acetate 5 parts by weight of EVA with a content of 18%, Vinyl ac...

Embodiment 2

[0082] A kind of SEBS / EVA blended material closed-cell foaming process of the present invention comprises the following steps:

[0083] ①Batching and low speed mixing

[0084] Take 23 parts by weight of SEBS and 40 parts by weight of white mineral oil and mix them in a low-speed mixer, control the speed at 1450 rpm, mix at a temperature of 30°C, and mix them for 10 minutes to fully mix SEBS powder and white mineral oil;

[0085] ②Stay

[0086] Place the above-mentioned mixture in the trough and let it stand for 24 hours, so that the SEBS powder can further absorb the white mineral oil;

[0087] ③High-speed mixing

[0088] Put the SEBS powder that has fully absorbed white mineral oil in a high-speed mixer, control the rotation speed at 2600 rpm, mix at a temperature of 60°C, and mix for 8 minutes; the SEBS high-mixture is obtained;

[0089] ④ Banbury

[0090] Get 10 parts by weight of the above-mentioned SEBS high compound, 10 parts by weight of EVA, CaCO 3 50 parts by wei...

Embodiment 3

[0093] A kind of SEBS / EVA blended material closed-cell foaming process of the present invention comprises the following steps:

[0094] ①Batching and low speed mixing

[0095] Take 28 parts by weight of SEBS and 60 parts by weight of white mineral oil and mix them in a low-speed mixer, control the rotation speed at 1470 rpm, mix at a temperature of 40°C, and take 15 minutes to fully mix SEBS powder and white mineral oil;

[0096] ②Stay

[0097] Above-mentioned mixed material is placed in feed tank and left standstill for 50 hours, SEBS powder is further absorbed white mineral oil;

[0098] ③High-speed mixing

[0099] Put the SEBS powder that has fully absorbed white mineral oil in a high-speed mixer, control the speed at 2900 rpm, mix at a temperature of 70°C, and mix for 10 minutes; the SEBS high-mixture is obtained;

[0100] ④ Banbury

[0101] Get 40 parts by weight of the above-mentioned SEBS high compound, 40 parts by weight of EVA, CaCO 3 50 parts by weight, 25 parts...

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Abstract

The invention discloses a closed-cell foaming technology method for an SEBS-EVA blending material. The method comprises the following steps that 1, SEBS and white mineral oil are taken to be mixed in a low-speed mixing machine, the rotating speed is controlled at 1450-1470 r / min, the mixing temperature is controlled at 30 DEG C-40 DEG C, and the time is controlled for 10-15 min, so that the SEBS and the white mineral oil are fully mixed evenly and absorbed; 2, standing is performed for 48 hours; 3, high-speed mixing is performed to obtain an SEBS highly-mixed material; 4, internal mixing is performed; 5, an internally-mixed material is processed through first-time open mixing, second-time open mixing, cooling and piece discharging and mould-pressing foaming and forming, and then the SEBS-EVA blending material is obtained. The closed-cell foaming technology method for the SEBS-EVA blending material has the advantages that the problems that in an existing technology, black flecks exist on the surfaces of particles or in the particles, a product is poor in color, plastification is bad, and the product is carbonized are solved, the produced product is uniform in color, the tensile strength, the elongation at break and the tear strength are all significantly improved, the hardness is decreased, and all physical property indexes are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of polymer material foaming, and in particular relates to a SEBS / EVA blend material closed-cell foaming process; the material produced by the method of the invention is mainly used for sports cushioning, shock absorption, protection, family and public The site is non-slip, and it can also be used in thermal insulation, heat insulation, sound insulation, waterproof, sealing and other industries. Background technique [0002] The current foaming process of SEBS / EVA blended materials is as follows: [0003] Ingredients-slow mixing-clean discharge-high-speed mixing-twin-screw high-temperature extrusion-underwater pelletizing-banburying-primary refining-secondary refining-cooling sheet-molding and foaming. [0004] However, there are the following problems in actual production using the above-mentioned process: [0005] 1. Black spots [0006] There are black spots on the surface or inside of the particles aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L91/06C08L53/02C08K13/02C08K3/26C08K5/14C08K3/22C08K5/098C08J9/10B29B7/74
CPCB29B7/7404C08J9/103C08J2203/04C08J2323/08C08J2391/06C08J2423/08C08J2453/02C08L23/0853C08L91/06C08L2203/14C08L2205/03C08L53/025C08K13/02C08K2003/265C08K5/14C08K2003/2296C08K5/098
Inventor 梁致樑梁兼胜梁谦龙
Owner 湖北顶铭环保材料有限公司
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