CN-122011660-A - White oil-free thermoplastic elastomer composition and preparation method and application thereof

Abstract

The invention discloses a white oil-free thermoplastic elastomer composition, and a preparation method and application thereof. The composition takes the A-B-A styrene block copolymer and the polyolefin resin as A matrix, and is matched with the halogen-free flame retardant, so that mineral white oil in the traditional TPE is thoroughly abandoned. The material fundamentally solves the problems of greasy surface, poor adhesive force, large smell, easy aging, migration pollution and the like caused by oil precipitation, and has the comprehensive advantages of excellent precipitation resistance, excellent secondary processing adhesive force, extremely low VOC, aging resistance, high safety and the like. The preparation method is simple, is suitable for injection molding, and the prepared data wire and other products have permanently dry surfaces and firm printed marks, and are particularly suitable for the fields of high-end consumer electronics, automobiles, medical treatment, mother and infant products and the like with extremely high requirements on cleanliness, safety and durability.

Inventors

• HU ZHILEI
• LU WEIRONG
• XU CHEN

Assignees

• 协讯电子（吉安）有限公司

Dates

Publication Date

20260512

Application Date

20260211

Claims (4)

1. 1. The white oil-free thermoplastic elastomer composition is characterized by comprising, by weight, 20-70% of A-B-A type styrene block copolymer, 10-40% of polyolefin resin, 20-60% of halogen-free flame retardant and 0.1-10% of other additives.
2. 2. The white oil free thermoplastic elastomer composition of claim 1, wherein the A-B-A styrenic block copolymer is SEBS.
3. 3. The white oil-free thermoplastic elastomer composition according to claim 1, wherein the polyolefin-based resin is polypropylene or polyethylene.
4. 4. Use of the white oil-free thermoplastic elastomer composition according to any one of claims 1 to 3 in preparing a data line product, comprising raw material preparation and mixing, injection molding, cooling and shaping, and post-treatment, wherein the injection molding process parameters comprise primary injection pressure of 50-70KG/cm < 2 >, secondary pressure maintaining pressure of 15-35KG/cm < 2 >, total injection pressure of 80-100KG/cm < 2 >, upper temperature section of a charging barrel of 180-200 ℃, middle section of 185-205 ℃ and lower section of 190-210 ℃.

Description

White oil-free thermoplastic elastomer composition and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a white oil-free thermoplastic elastomer composition, and a preparation method and application thereof. Background In the conventional design and production practice of thermoplastic elastomer (TPE) materials, mineral oil (commonly known as "white oil") is commonly used as a plasticizer and processing aid in order to effectively reduce raw material cost, improve processing flowability, and adjust product hardness. Although this classical formulation meets the basic requirements of the general field for a long time, its inherent drawbacks are increasingly pronounced with the high-end and environmental regulations of downstream applications. Taking a data wire product as an example, the data wire product is used as a consumer electronic product with high frequency and long period, and has extremely high requirements on the surface cleanliness, touch feeling, mark durability and environmental safety of materials. A key problem with conventional white oil containing TPEs in practical applications is that the added mineral oil is not bonded to the matrix resin (e.g. SEBS) in a stable chemical bond, but rather in a physically doped form. Under the conditions that the wire rod is bent for a long time for use, the ambient temperature changes or the wire rod contacts skin grease of a user, oil contents gradually migrate from the inside of the material to the surface and are separated out, and an obvious oil film is formed, namely the phenomenon of 'oil spitting' or 'oil bleeding' commonly known in industry. The separation process causes a series of linkage application pain points on the data wire and other fine products, namely, firstly, a surface oil film causes the wire to feel oily, dust and textile fibers in a pocket are extremely easy to adsorb, appearance cleanliness and user experience are seriously affected, secondly, a separated oil layer forms a weak interface layer, manufacturer marks for surface spraying, adhesion force of color coating or two-dimensional code printing are seriously hindered, handwriting is fuzzy, coating is shed, product identification and brand image are affected, volatile small molecular substances in mineral oil can be continuously released in a closed space (such as a packaging bag and an automobile storage box), uncomfortable plastic taste is generated, volatile Organic Compound (VOC) emission problems are brought, the traditional TPE is difficult to meet increasingly severe environmental protection and health standards, in addition, the sensitivity of materials to ultraviolet rays and oxygen is accelerated due to the existence of the surface oil, the data wire is more easily to be yellowing and the service life of the product is shortened, more attention is paid, the migrated oil can possibly cause the situation that the mineral is closely contacted with the mineral oil or wound with other materials (such as an ABS (such as an earphone, a storage box) to be corroded by the surface, a plastic sleeve, or a potential skin is polluted, and the potential skin is polluted by the environmental protection factors, and the potential safety factors are limited by the skin factors are limited in view of the aspects of the environmental protection and the skin is influenced, and the potential safety factors are limited, and the skin is polluted and the skin factors are finally is polluted. Therefore, developing a novel solution capable of thoroughly eliminating oil precipitation from the formulation source and simultaneously maintaining or even improving the comprehensive performance of TPE materials for precision products such as data wires and the like has become an urgent technical requirement for promoting the consumer electronics accessory industry to upgrade to the directions of high performance, high reliability and high added value. Disclosure of Invention The invention aims to overcome the defects of the existing white oil-containing TPE and provide a white oil-free thermoplastic elastomer composition with high cleanliness, strong adhesion, low odor, aging resistance and high safety, and a preparation method and application thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: in a first aspect, the present invention provides a white oil free thermoplastic elastomer composition comprising the following components in weight percent: 20-70% of A-B-A styrene block copolymer; 10-40% of polyolefin resin; 20-60% of halogen-free flame retardant; 0.1-10% of other auxiliary agents. Preferably, the CAS number for the class A-B-A styrene block copolymer is 66070-58-4. The polyolefin-based resin includes, but is not limited to, polyolefin having a CAS number of 9003-07-0. Preferably, the other auxiliary agents include antioxidants, lubricants