How to Deal with the Sticky Texture of TPE/TPR Products?

Problem Description

Some products made from TPE/TPR granules have sticky texture.

Problem Analysis

TPE/TPR granules are thermoplastic elastomers produced by compounding SEBS and SBS (worked as substrate), compounding oil, reinforced resins, compatiblizing agents, functional additives, and fillers.

  1. Amount of added compounding oil

Compounding oil is one of the indispensable constituents of TPE/TPR granules. The addition of compounding oil can improve TPE/TPR’s plasticity, but it also may result in the sticky texture of TPE/TPR products. The hardness of TPE/TPR granules is in the range of Shore A0~100. Generally speaking, the more compounding oil added, the softer TPE/TPR products, and the stickier texture TPE/TPR products will have.

  1. Influence of substrate

In the TPE industry, the compounds using SEBS and SBS as substrate are usually called TPE and TPR respectively. SEBS is the hydrogenated SBS and superior to SBS in oil absorbency, namely for the same mass numbers of SEBS and SBS, SEBS can absorb more compounding oil, or the surface of SEBS-based TPE products are not easy to be sticky compared with that of SBS-based TPR products. SBS-based TPR granules have hardness below Shore A50~60. They are prone to cake in summer due to the high temperature, and the products made from TPR granules have relatively stickier texture. SEBS-based TPE products rarely have sticky texture except those made from super soft materials with hardness below Shore A15.

Recommended Solution

Based on the above analysis, the products made from SBS-based TPR granules are easy to have sticky texture, especially at high temperature. Hence, it is recommended that manufacturers use SEBS-based TPE granules for product production to deal with the sticky texture of TPR products.

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How to Improve TPE/TPR Materials’ Toughness, Resilience, Abrasion Resistance and Tensile Properties?

As thermoplastic elastomers, TPE/TPR materials are not as good as vulcanized rubber in toughness, abrasion resistance, and resilience. TPE/TPR materials are therefore usually applied in non-mechanical and engineering sectors like consumer goods industry.

However, consumer goods industry sometimes has different requirements for toughness, abrasion resistance and resilience of TPE/TPR materials. This depends on the demands for product quality from end users, or end user market determines the level of product quality and the quality of selected raw materials.

Generally, TPE/TPR suppliers with experience in the R&D and production of TPE/TPR materials can offer customers specific TPE/TPR grades on the basis of their product requirements, such as excellent toughness, resilience, and abrasion resistance, to satisfy customers’ cost-effectiveness demands. To do this, the formulas of TPE/TPR materials can be adjusted, although it is very difficult to develop the suitable TPE/TPR materials that satisfy customers’ strict requirements.

The improvement of TPE/TPR materials’ poor toughness, tensile properties, abrasion resistance, and resilience can be considered from the following aspects:

  1. Too many fillers are added in the production of TPR/TPRmaterials. This will reduce tensile strength, elongation and other tensile properties of TPR/TPR materials, and also have a negative effect on its resilience and abrasion resistance.
  2. The substrates have low molecular weight or are non-hydrogenated. Low molecular weight substrate-basedTPE/TPR materials have relatively poor resilience, tensile properties, as well as abrasion resistance. Non-hydrogenated substrate-based TPE/TPR materials have relatively poor tensile properties.
  3. There is a problem with TPE/TPRmaterials’ plasticization in extrusion or injection molding. The poor plasticization will lead to adverse effect on the above-mentioned physical properties.
  4. The compatibility ofall ingredients in TPE/TPR formula also needs to be considered. The poor compatibility can’t result in good physical properties.
  5. The addition of functional additivescan improve TPE/TPR materials’ abrasion resistance.

 

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What is SIS blcok copolymer

SIS blcok copolymer are based on styrene and isoprene and are the lowest hardness and lowest viscosity of all the styrenic block copolymers.
SIS are high performance thermoplastic elastomers with a combination of high strength, low hardness and low viscosity for easy thermoplastic processing as a melt or in solution.
SIS block copolymer are ideally suited for formulating pressure sensitive adhesives (packaging tape, labels, etc.), hot melt spray, diaper adhesives, elastic films, and many other innovative applications.
SIS block copolymer TDS

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SBS rubber 185 – Styrene Butadiene Styrene block copolymer materials

SBS rubber 185 – Styrene Butadiene Styrene block copolymer materials

SBS rubber 185 DESCRIPTION

Thermoplastic elastomer SBS rubber 185 is oil-extended, radiation type, styrene-butadiene-styrene triblock copolymer. Its oil-filled rate is 31%, and styrene content is 32%. It can be injection moled directly due to its high fluidity. YH-185 and YH-815 are both radiation type oil-extended rubber. However the wear-resisting property and tensile strength of SBS polymer YH-185 have been significantly improved than YH-185.

SBS rubber 188

SBS rubber 185 APPLICATION

Adhesive / Shoes / Compounding

SBS-815+

CHEMICAL PROPERTIES

Structure: R

Styrene Content  (%) : 32

Oil Content  (%): 31

MFI  (g/10min) : 0.1-2.0

Shore A  (/): 60-70

Solution Viscosity  (25%,25℃,mPa.s) :  -

Tensile Strength  (Mpa) :  ≥15

Elongation  (%): -

Stress at 300%  (Mpa) : -

Ash  (%):  -

Volatility  (%):≤0.70

 

FORMULA

TPR Shoe (Parts by mass)

SBS(YH185): 130

Oil : 45

PS : 15

CaCO3 : 75

 

ALTERNATIVE GRADES

LCY 1485

 

MANUFACTURE

Sinopec

 

One-stop global sourcing

Competitive pricing and quality

Professional customized service

 

Certificate REACH SVHC ,EU,ROHS,PAHs, FDA,RAPIDS,VOC

Price: negotiable

 

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SBS rubber 165 – Styrene Butadiene Styrene block copolymer materials

SBS rubber 165 – Styrene Butadiene Styrene block copolymer materials

 

SBS rubber 165 DESCRIPTION

Thermoplastic elastomer SBS polymer 165 is non-oil-extended styrene-butadiene-polystyrene triblock copolymer rubber with linear structure and high transparency. The styrene content is 40%.

SBS rubber 188

SBS rubber 165 APPLICATION

Shoes / Compounding

SBS rubber 165 application

 

CHEMICAL PROPERTIES

Structure: L

Styrene Content  (%): 40

Oil Content  (%): 0

MFI  (g/10min) : 5.0-9.0

Shore A  (/): 86-92

Solution Viscosity  (25%,25℃,mPa.s) : -

Tensile Strength  (Mpa) : ≥28.0

Elongation  (%): -

Stress at 300%  (Mpa) : ≥5.5

Ash  (%): -

Volatility  (%) ≤0.70

 

ALTERNATIVE GRADES

Taipol 4202

Kraton 1155B

 

MANUFACTURE

Sinopec

 

One-stop global sourcing

Competitive pricing and quality

Professional customized service

 

Certificate REACH SVHC ,EU,ROHS,PAHs, FDA,RAPIDS,VOC

Price: negotiable

 

More info:  http://www.becmaterials.com

Any feedback: BEC@becmaterials.com

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SBS rubber T171 – Styrene Butadiene Styrene block copolymer materials

SBS rubber T171 DESCRIPTION

Thermoplastic elastomer SBS rubber T-171 is an oil-extended styrene-butadiene-styrene triplex block copolymer specially for shoes with high molecular weight and radiation type. Its oil-extended rate is 33%, and the styrene content of SBS polymer T-171 is 40%.

SBS rubber 188

SBS rubber T171 APPLICATION

Shoes / Compounding

SBS rubber 171 application

 

CHEMICAL PROPERTIES

Structure: R

Styrene Content  (%): 40

Oil Content  (%): 33

MFI  (g/10min) :  1.0-7.0

Shore A  (/): 60-80

Solution Viscosity  (25%,25℃,mPa.s) :  -

Tensile Strength  (Mpa) :  -

Elongation  (%):-

Stress at 300%  (Mpa) :-

Ash  (%):-

Volatility  (%): ≤1

 

FORMULA

Gum Outsole (Parts by mass)

SBS(T-171): 40

PS: 8

SiO2: 7

Naphthenic Oil: 7

K-resin:  3

 

ALTERNATIVE GRADES

LCY 1475

 

MANUFACTURE

Petrochina

 

One-stop global sourcing

Competitive pricing and quality

Professional customized service

 

Certificate REACH SVHC ,EU,ROHS,PAHs, FDA,RAPIDS,VOC

Price: negotiable

 

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SBS rubber T161B – Styrene Butadiene Styrene block copolymer materials

SBS rubber T161B – Styrene Butadiene Styrene block copolymer materials

 

SBS rubber T161B DESCRIPTION

Thermoplastic elastomer SBS polymer T-161B is a non-oil-extended styrene-butadiene-styrene triblock copolymer rubber for TPR and asphalt modification with radiation type and high molecular weight. The styrene content is 30%.

SBS T161B

 

SBS rubber T161B APPLICATION

Adhesive / Shoes / Compounding

SBS T-161B

 

CHEMICAL PROPERTIES

Structure: R

Styrene Content  (%): 30

Oil Content  (%):  0

MFI  (g/10min) :  <1

Shore A  (/):-

Solution Viscosity  (25%,25℃,mPa.s) :  -

Tensile Strength  (Mpa) :  -

Elongation  (%):-

Stress at 300%  (Mpa) :  -

Ash  (%):-

Volatility  (%): ≤1

 

FORMULA

Waterproof Roll (Parts by mass)

SBS(T-161B): 3 ~ 5

Asphalt: 50

Oil: 5 ~ 10

Softener: 5

CaCO3: 30 ~ 40

 

ALTERNATIVE GRADES

Vector 2336

Vector 2411

 

MANUFACTURE

Petrochina

 

Certificate REACH SVHC ,EU,ROHS,PAHs, FDA,RAPIDS,VOC

Price: negotiable

 

One-stop global sourcing

Competitive pricing and quality

Professional customized service

 

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