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Ultrahigh melt index type styrene thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer, thermoplastic elasticity technology, applied in the field of styrene thermoplastic elastomer, can solve the problems of poor adhesion strength and low temperature resistance, lack of viscosity, high cost, and achieve high compatibility, simplified process, low melt viscosity. Effect

Pending Publication Date: 2022-04-12
黄山永皓新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, styrene-based block copolymers have been used in hot melt adhesives, pressure-sensitive adhesives and quick-release covering adhesives. Although the performance of adhesives prepared by traditional diblock polymers SEP and SEB is good, the cost is relatively high. High; while traditional SBS-prepared adhesives are more suitable for the medium-performance market, they are generally not suitable for low-cost adhesives that require spraying temperatures below 162°C
Traditional polyolefin materials are generally used in the low-cost, low-performance adhesive market, but have poor bond strength and low temperature resistance, which are very important for certain hot melt adhesive applications
US Patent US7348376 describes a low melt flow rate SEBS and polyolefin adhesive formulation, but it lacks the viscosity required for application at low spray temperatures <162°C

Method used

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  • Ultrahigh melt index type styrene thermoplastic elastomer and preparation method thereof
  • Ultrahigh melt index type styrene thermoplastic elastomer and preparation method thereof
  • Ultrahigh melt index type styrene thermoplastic elastomer and preparation method thereof

Examples

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Effect test

preparation example Construction

[0055] The preparation method of linear triblock copolymer is as follows:

[0056] Step 1: After the polymerization solvent, initiator, and monovinyl aromatic hydrocarbon are added in sequence to initiate the first stage of polymerization, a microstructure regulator is immediately added to speed up the polymerization reaction rate and prepare to regulate the microstructure of step 2. The monomer concentration of the polymerization reaction is preferably 8-30%, further preferably 13-25%, most preferably 17-20%; the polymerization temperature is preferably 0-100°C, further preferably 10-70°C, most preferably 20-40°C; atmosphere The condition is a slight positive pressure of nitrogen; the reaction time of the first stage of polymerization is preferably 15-60min, more preferably 20-50min, most preferably 30-40min; the addition amount of the microstructure regulator in the polymer is preferably 1000-5000ppm, more preferably 2000-4000ppm, Most preferably 2500-3000ppm;

[0057] Step...

Embodiment 1

[0072] Preparation of base glue SBS

[0073] The polymerization reaction is carried out in a polymerization kettle with an internal volume of 5 liters. The polymerization kettle is equipped with stirring, electric heating, and temperature control of 10°C circulating water. Before the polymerization reaction, add 4 liters of cyclohexane (water value Figure 10 . In addition, the BRUKER company's AV-600 model, 600MHz hydrogen nuclear magnetic resonance instrument was used to analyze the microstructure of the polymer with deuterated chloroform as the test solvent. For the structural analysis method, see the master's degree thesis of Wang Dongfang and Zhang Chuanqi, Beijing University of Chemical Technology, For polymer microstructural data see Figure 10 with Figure 7 .

[0074] Preparation of hydrogenated gum HSBS

[0075]After the hydrogen gas was terminated, the temperature of the hydrogenation tank was maintained at 70°C, and then 22 ml of the above-mentioned hydrogenati...

Embodiment 2

[0078] Preparation of base glue SIS-1

[0079] The polymerization process can refer to Example 1, but tetrahydrofurfurylamine is not added, and 545 grams of isoprene monomer is added in the second stage of polymerization instead. For molecular weight information and microstructural data see Figure 10 .

[0080] Preparation of Hydrogenated Glue HSIS-1

[0081] The hydrogenation process can refer to embodiment 1. For iodine value, degree of hydrogenation, molecular weight information, mechanical properties and melt index data, see Figure 11 .

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Abstract

The invention belongs to the technical field of styrenic thermoplastic elastomers, and particularly relates to an ultrahigh melt index type styrenic thermoplastic elastomer and a preparation method of the ultrahigh melt index type styrenic thermoplastic elastomer. Comprising a selective hydrogenation product of a block copolymer of one or more monovinyl aromatic hydrocarbon and one or more conjugated diene, and the general formulas for representing the molecular structure of the selective hydrogenation product mainly comprise two of the following formulas: SDS and (S1D1) nX. The polymer disclosed by the invention has extremely low melt viscosity, excellent rebound resilience and mechanical property and excellent comprehensive performance; when being blended with PP, the elastic non-woven fabric shows extremely high compatibility, and the elastic non-woven fabric integrating softness, rebound resilience, no noise and extensibility can be prepared; under the condition of not adding any processing aid, the thermoplastic elastomer can well adapt to the melt-blowing process requirements, and is a currently known styrene thermoplastic elastomer with the maximum melt flow rate.

Description

technical field [0001] The invention belongs to the technical field of styrene-based thermoplastic elastomers, and in particular relates to an ultra-high-melting finger-type styrene-based thermoplastic elastomer, and also relates to a preparation method of an ultra-high-melting finger-type styrene-based thermoplastic elastomer. Background technique [0002] Since the 1950s and 1960s, people have done a lot of research on the preparation and application of styrene-based thermoplastic elastomers, and the corresponding industrial products have been updated several times, and have been deeply promoted and promoted in various fields of human production and life. Applications, uses include injection molding, extrusion, blow molding and other processing methods to produce products such as films, fibers and non-woven fabrics, and are also used for asphalt modification to produce roofing and road paving materials. [0003] The United States was the first to apply for a patent related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08F8/04C08F2/38
Inventor 张川琦张慧
Owner 黄山永皓新材料科技有限公司
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