styrene ethylene butylene styrene SEBS thermoplastic elastomer Replace PVC

SEBS styrene ethylene butylene styrene thermoplastic elastomer Nature White Powder Replace PVC

SEBS is actually a form of thermoplastic elastomer (TPE) with styrene added. Green Peace lists SEBS as an acceptable alternative to PVC in toys. Polyolefin plastics such as Polyethylene (PE) and Polypropylene (PP) are the most common building blocks for SEBS, which don't need plasticizers (like phthalates) or stabilizers (like lead) for flexibility.

SEBS is used in a wide variety of general-purpose rubber items as well as in handlebar grips, toothbrushes, sports mouth guards, diapers (as the elastic component) and teethers. The chemical resistance of SEBS is similar to natural rubber, having excellent resistance to water, acids, and bases.

SEBS good alternative PVC

However, there are two main drivers in the search for alternative PVC. First, plasticized PVC has an undesired related to the release of dioxins when incinerated uncontrolled environmental impact. Secondly, there is concern that plasticizers of PVC (called "eestrogene mimics") can migrate to the human body. Potential alternative plasticized PVC tubes are polymer compositions containing polypropylene (PP) combined with a copolymer of elastomeric blocks. These compositions do not contain  mimics" or release dioxins when incinerated.SBCs are thermoplastic elastomers consisting of polystyrene end blocks (PS) chemically linked by a connecting rubber block PB. The rubber intermediate block consists most frequently PB polybutadiene, polyisoprene IR or hydrogenated versions poly-olefin: ethylene-butylene and ethylene-propylene SEEPS.Styrene butylene styrene ethylene, also known as SEBS, is a form of thermoplastic elastomer, styrene added. SEBS elastomer is a hydrogenated, with properties such as high strength, good heat resistance and flexibility. There are other advantages, such as resistance to UV and ozone, high dispersibility, thermooxidative stability, excellent processing capabilities, the broad compatibility of the tackifiers, high capacity oil absorption and stability in processing at high temperature, which allow SEBS for multiple applications in various industries end use.A new family of hydrogenated SBC appears to be closing the performance gap with plasticized PVC. This family is based on midblock segment improved rubber (ERS), containing a higher content than more traditional butylene midblock SEBS. The benefits of ERS-SEBS polymers include improved processability and better compatibility with polypropylene. The fine network of ERS-SEBS mixture leads to a significant improvement in transparency. Another effect of improved compatibility with PP is a broadening of the glass transition temperature (Tg) below room temperature. The improved compatibility opens a number of properties of the material, which makes the SBC-PP mixtures are very suitable for replacement of plasticized PVC.Binding to these new materials can be challenging due to lack of bondable molecules along the polymer surface. A light curable adhesive provides high adhesion to all the various components.

Replace PVC

SEBS is used as a possible replacement of PVC in the manufacture of toys. SEBS is similar to natural rubber and is less dangerous compared to their counterparts. FDA approvals and BGW for implementing SEBS can create an opportunity for growth for the product in the global market. The styrene polymer SEBS styrene used as the central building block, and has favorable properties, such as improved impact resistance, flow, rigidity, low temperature, thermal stability and durability. SEBS is now replacing PVC, due to its greater structural retention, dimensional integrity and chemical compatibility. In addition, SEBS, being free of phthalates and environmentally friendly, can replace the application of PVC in multiple industries.SEBS has been replacing the application of PVC in industries such as medical, pharmaceutical, adhesives and sealants, cables and wires, building materials, cosmetics and personal care, agriculture, packaging, footwear, furniture, clothing, toys, sports and electronic items. Using SEBS gadgets granules is increasing in the manufacture of medical devices, tubes and bags, as it is biocompatible and comparatively environmentally friendly than PVC.

Applications

This advanced development of SEBS elastomer keeps the characteristics extremely soft and similar to rubber, but at the same time incorporates an improvement in terms of weather resistance, temperature and chemistry. Typical applications are profiles, household items, handles, knives, handles, accessories, feet, storage, non-slip inserts, knobs, buttons, seals, profiles, pedal covers, power tools, cable seals , refrigerator seals, plugs and sockets, cable liners, switches, enclosures, garden tools, knobs, foamed fittings, bottle caps, foamed seals, foam or expanded caps approved by FDA, high quality bed bases, construction in exterior, the mouthparts and the cosmetic sector, etc. SEBS thermoplastic is an interesting alternative to the TPV since it has the same type of resistance to weathering, dampers, fins, masks, caps, terminals, non-slip and boots. SEBS is already used in the production of toys and can replace PVC for the production of doll heads (with hair) using rotational molding techniques, one of the most difficult PVC substitutions. The SEBS is also used in the electrical industry for items such as flexible cables and can replace PVC.

High-performance polymers are often selected for applications that require structural and dimensional integrity retention under exposure to aggressive chemical conditions and elevated temperatures. One of these options for cost-effective performance polymers is plasticized PVC. However, much attention has been paid to the evaluation of more environmentally friendly and biological polymers. Styrene-ethylenebutylene-styrene copolymer rubbers (SEBS), mixtures of SEBS / polypropylene, TPE (thermoplastic elastomers) and polypropylenes are emerging as high-performance alternatives. In particular, TPEs are used to replace low durometer plasticized PVC in medical device applications, where biocompatibility characteristics are crucial. However, adhesive bonding to these polymers can be a challenge.

SEBS

SEBS is a linear triblock copolymer of polyethylene as terminal segment and Ethylene butene copolymer obtained by hydrogenation of polybutadiene as elastic block in the middle. Its full name is Styrene Ethylene Butylene Styrene , or SEBS for short.

1.SEBS has good uv stability, antioxidant and thermal stability, so it can also be used in roofing and asphalt for road repair.
2.SEBS is soluble in paraffin wax and can be used as a flexible surface coating on paper products.
3.SEBS is temperature insensitive when heated without obvious shear flow, so it can be used as a template for IPN. (The basic principle of IPN is that two insoluble polymers can achieve the interpenetration of the entangled chain segments, so that the two insoluble polymers can be "locked" together by covalent crosslinking.)
4. Organic solution of SEBS oil blend can replace natural latex to manufacture surgical gloves and other products. Because SEBS does not contain unsaturated double bonds and has high purity, it has the following two advantages :

(1) good antioxidant and ozone resistance;

 

(2) Natural rubber contains protein that can cause dangerous allergic reactions in some patients, while this blend does not.

 

SEBS Properties

Shore A hardness of 13 to 70 D
Operating temperature -40 at 100 ° C
Resistance to detergents, acids, bases, etc.
Density 0.89 to 1.20 g / cm
Good weatherability
Good resistance to UV
Good chemical resistance
Good compression set
good abrasion
good processability
Easy coloring
transparent degrees
Grades for food contact
Compatible with PP,PS,EVA,TPU,PBT,ABS,PC/ABS, PA
100% recyclable

 

SEBS Physical and mechanical properties

 

 

Elastomers of styrenic block copolymers SEBS polymers are among the most versatile and easy to process in the plastics material. The EB XPRENE a very good coefficient of surface friction, low permanent deformation, a tensile strength. Normally they do not require drying, have broad processing latitude and have good to excellent thermal stability. Most commercial TPE can be processed by a variety of techniques. In addition, there are many degrees of specialty formulated to suit particular processes. Other features of the SEBS polymerThey include neutral base color, resistance to aging and UV radiation, the compression set and approval for food contact. The special qualities with specific acoustic properties, modified adhesion, heat stability and flame retardancy complete the current product range.

 

SEBS structure

 

Since the rubber blocks and hard polystyrene are incompatible, a strong phase separation results in the formation of polystyrene domains. These domains act as physical cross and can rupture and reset by a combination of shear and temperature links. The amount of shear required to process SBC depends on molecular weight of polystyrene (Mw) and the type of rubber midblock. Styrene-ethylene-butylene-styrene (SEBS) SBCs are usually not hydrogenated his predecessors strongest domains.

 

SEBS resin is a block copolymer of styrene base and butadiene elastomer, also known as Styrene-Ethylene / Butylene-Styrene (SEBS), thermoplastic elastomers, in which the elastomeric phase is modified by hydrogenation. The hydrogenation of an SBS rubber leads to the formation of an elastomeric segment in which the alternative ethylene units with the units of which butyleneiche name SEBS. Thanks to the absence of the double bond, XPRENE EB, have an excellent resistance to oxidation and can be added with plasticizers and fillers. SEBS polymer belongs to the family of thermoplastic elastomers in which the elastic phase is constituted by the rubber of SEBS (styrene-ethylene-butylene-styrene), and the plastic phase is generally of an elastomeric polyolefin phase. Due to its structure and behavior thermoplastic elastomers are located between plastics (SEBS thermoplastics) and rubber (elastomer). The thermoplastic SEBS combine the typical advantages of rubber and plastic materials. The products included in this class are compatible with polypropylene and are used for overmolding and extrusion. Its resistance to ultraviolet rays (due to its chemical nature SEBS rubber (is saturated), and devoid of double bonds, this makes XPRENE EB is particularly resistant to the action of UV rays and weathering), then makes them the ideal option for outdoor applications that require a high resistance to oxidizing agents.

 

Specification

item	value
Place of Origin	China
Brand Name	changhong
Model Number	SEBS
Product Name	Styrene Butadiene Styrene SBS Resin
Appearance	Nature White Granule/powder
Application	Rubber Products
Material	Rubber Material
Type	100% Virgin Material
Shape	Granuels
Packing	25kg Kraft Paper Bag
SAMPLE	Avaliable
MOQ	10MT
DELIVERY TIME	7-15days

长鸿高科热塑性弹性体参数表/ Changhong Polymer Catalogue
品名(Brand) 规格(Specification)	SEBS
	CH1320	CH1310	CH4320	CH1510	CH1520
结构(Structure)	线性(Linear)	线性(Linear)	星型(Ridial)	线性(Linear)	线性(Linear)
苯乙烯含量(Styrene)%	33~35	29~31	34.5～35.5	29.5~30.5	33.5~34.5
充油率 (Oil content) / 加氢度(Hydrogenation degree)	加氢度≥97.0 (Hydrogenation degree)	加氢度≥97.0 (Hydrogenation degree)	加氢度≥97.0 (Hydrogenation degree)	加氢度≥97.0 (Hydrogenation degree)	加氢度≥99.0 (Hydrogenation degree)
熔融指数(MFI,g/10min) / 甲苯溶液粘度(Toluene solution viscosity,g/10min)	TSV.10%, 25C. 1000~4500	TSV.10%, 25C. 200~800	TSV.10%, 25C. 200~800	TSV.10%, 25C.≤200	TSV.10%, 25C. 1000~3000
分子量 (Molecular weight)	180K~230K	90K~110K	210K~230K	70K~75K	190K~220K
拉伸强度 (Tensile strength)(Mpa)	≥18.0	≥16.0	≥18.0	≥16.0	≥18.0
扯断伸长率(Elongation)	≥400%	≥450%	≥400%	≥450%	≥400%
300%定伸应力(Tensile modulus at 300%, Mpa)	≥3.0	≥3.0	≥3.0	≥3.0	≥3.0
扯断永久变形 (Tensile Set)	≤40%	≤40%	≤48%	≤40%	≤40%
邵氏硬度 (Hardness, shore, A)	≥70A	≥68A	≥80A	≥70A	≥70A
挥发份 (Volatile matter (wt%)	≤1.0%	≤1.0%	≤1.0%	≤1.0%	≤1.0%
灰份 (Ash content (wt%)	≤0.20%	≤0.20%	≤0.20%	≤0.20%	≤0.20%
黄色指数 (Yellow Index)	≤6	≤6	≤6	≤6	≤4
包装规格 (Package)	13kg/bag	13kg/bag	13kg/bag	13kg/bag	13kg/bag