Temperature-resistant high-resilience imitated silica gel TPE material and preparation method thereof

Abstract

The invention provides a temperature-resistant high-resilience imitated silica gel TPE material and a preparation method thereof. The preparation method comprises the following steps: step 1, taking 2, 5-dimethyl-2, 5-di-(tert-butylperoxy) hexane as an initiator, taking an olefin block copolymer (OBC) and glycidyl methacrylate (GMA) as grafting monomers, carrying out melt blending by a twin-screw extruder, carrying out extrusion granulation, and carrying out vacuum drying to obtain a graft; the invention solves the problem of insufficient performance of the existing imitated silica gel TPE material, and provides the imitated silica gel TPE material with high resilience and high temperature resistance by reasonably designing the material formula and the process flow. The invention aims to develop a material which is comparable with the silica gel in the aspects of touch, rebound resilience and temperature resistance, meanwhile, the advantages of short processing period and recoverability of a TPE (thermoplastic elastomer) material are reserved, and a more economical and environment-friendly alternative scheme is provided for a silica gel product. And the application requirements in different fields are met by optimizing a formula and process conditions.

Description

Technical Field

[0001] The invention relates to the technical field of thermoplastic elastomer materials, in particular to a temperature-resistant high-rebound silicone-like TPE material and a preparation method thereof. Background Art

[0002] As a soft material with excellent performance, silicone is widely used in many fields such as industry, food, and medical treatment due to its good resilience, touch, and environmental protection. Silicone has high temperature resistance, excellent chemical stability, and biocompatibility, so it is often used as a main material or spare parts. However, in recent years, the use of silicone has faced a series of problems, including gradually rising prices, complex molding processes, non-recyclability, and long molding cycles. These disadvantages have gradually reduced the economy and processing efficiency of silicone in some application scenarios. As a new type of elastic material, thermoplastic elastomer (TPE) combines the advantages of rubber and plastic, with excellent touch, lower production costs, and more environmentally friendly characteristics. TPE can be processed by traditional thermoplastic processing methods such as injection molding and extrusion, can be recycled and reused, and has a short molding cycle. It has become the preferred material to replace silicone in recent years.

[0003] However, in some special applications, the silicone-like TPE materials on the market have problems such as insufficient resilience, poor dimensional stability, and low temperature resistance. In particular, when processing thinner products, quality defects such as product shrinkage are prone to occur, which seriously affects the performance and service life of the product.

[0004] In order to solve the above problems, developing a silicone-like TPE material with high temperature resistance and excellent resilience has become an important research direction in the current technical field. This type of material should not only be close to or exceed silicone in resilience, but also have excellent high temperature resistance to meet the strict requirements of material performance in different fields. Therefore, the present invention aims at the deficiencies in the prior art and provides a silicone-like TPE material that can improve temperature resistance while maintaining high resilience, so as to meet market demand and optimize product performance. Summary of the invention

[0005] The object of the present invention is to provide a heat-resistant high-rebound imitation silicone TPE material and a preparation method thereof. The prepared imitation silicone has good resilience at both room temperature and high temperature and has obvious advantages in heat resistance and rebound.

[0006] To achieve the above object, the present invention proposes the following technical solution: a method for preparing a heat-resistant and high-resilience silicone-like TPE material, comprising the following steps:

[0007] Step 1, using 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane as an initiator, olefin block copolymer (OBC) and glycidyl methacrylate (GMA) as grafting monomers, melt blending through a twin-screw extruder, extrusion granulation, and vacuum drying to prepare a grafted product;

[0008] Step 2: Add styrene-ethylene block copolymer and white oil into a high-speed mixer according to a certain proportion, mix at a speed of 1000 r / min for 2 minutes, and then let it stand for 30 minutes to allow the rubber powder to fully absorb the oil;

[0009] Step 3: Add compatibilizer, reinforcing filler and antioxidant into a high speed mixer and mix for 2 minutes at a speed of 1000 r / min.

[0010] Step 4, after the materials are mixed, they are added into a twin-screw extruder for extrusion granulation, melt reaction in the screw, plasticization molding and extrusion, the material strips are cooled by a water tank, and then pelletized by a pelletizer to obtain the olefin thermoplastic elastomer with imitation silicone feel; wherein, the processing technology of the twin-screw extruder is as follows: the temperature of the first zone of the twin-screw extruder is 120-140°C, the temperature of the second zone is 190-210°C, the temperature of the third zone is 190-210°C, the temperature of the fourth zone is 190-210°C, the temperature of the fifth zone is 190-210°C, the temperature of the sixth zone is 190-210°C, the temperature of the seventh zone is 190-210°C, the temperature of the eighth zone is 190-210°C, the temperature of the ninth zone is 190-210°C, the temperature of the tenth zone is 180-190°C, the screw speed is 250-300r / min, and the finished product is dried in an oven.

[0011] Furthermore, in the present invention, the styrene-ethylene / butadiene-styrene in step 2 is one or a mixture of two or more of SEBS, SIS, SEPS and SEEPS.

[0012] Furthermore, in the present invention, the reinforcing filler in step 2 is one or a mixture of two or more of calcium carbonate, talcum powder and mica powder.

[0013] Furthermore, in the present invention, the lubricant in step 2 is one or a mixture of two or more of erucamide, pentaerythritol stearate, EBS and calcium stearate.

[0014] Furthermore, in the present invention, the antioxidant in step three is one or a mixture of two or more of antioxidants 1010, 168 and DSTDP.

[0015] A silicone-like TPE material comprises a TPE thermoplastic elastomer prepared by the above-mentioned method for preparing the silicone-like TPE material.

[0016] Beneficial effects: The technical solution of this application has the following technical effects:

[0017] The present invention solves the problem of insufficient performance of existing silicone-like TPE materials. The present invention provides a silicone-like TPE material with high resilience and high temperature resistance by rationally designing the material formula and process flow. Achieving an alternative material with performance comparable to silicone The present invention aims to develop a material that can be comparable to silicone in terms of touch, resilience and temperature resistance, while retaining the advantages of TPE materials with short processing cycle and recyclability, providing a more economical and environmentally friendly alternative for silicone products. Meeting application requirements in different fields By optimizing the formula and process conditions, the material of the present invention is not only suitable for general industrial use, but can also be used in high-demand fields such as food and medical care, meeting the needs of various industries for high-performance soft elastic materials.

[0018] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0019] The foregoing and other aspects, embodiments and features of the present invention will be more fully understood from the following description. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or will be learned from the practice of the specific embodiments according to the present invention. DETAILED DESCRIPTION

[0020] In order to better understand the technical content of the present invention, specific embodiments are specifically described as follows. The embodiments of the present disclosure are not necessarily defined in all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those concepts and embodiments described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone, or used in any appropriate combination with other aspects disclosed by the present invention.

[0021] Example 1

[0022] A heat-resistant high-resilience silicone-like TPE material and a preparation method thereof, comprising the following steps:

[0023] (1) Weigh 40 parts of styrene-ethylene / butylene-styrene block copolymer (SEBS), 38 parts of white oil, 5 parts of polypropylene, 6 parts of compatibilizer, 7 parts of calcium carbonate, 3 parts of PP modified polysiloxane, 0.2 parts of antioxidant 1010, 0.1 parts of erucic acid amide and 0.6 parts of titanium dioxide in sequence.

[0024] (2) First, add SEBS and white oil into a high-speed mixer respectively, stir at a speed of 1000 r / min for 2 minutes, and let it stand for 30 minutes to allow the rubber powder to be fully filled with oil.

[0025] (3) Slowly add the remaining raw materials into the mixer and stir at 1000 r / min for 2 min to obtain a premix.

[0026] (4) The premix is ​​added into the lower hopper of a twin-screw extruder, plasticized by the screw, melted, cooled by a water-drawn strip, pelletized by a pelletizer, and dried to obtain a silicone-like TPE material.

[0027] Example 2

[0028] A heat-resistant high-resilience silicone-like TPE material and a preparation method thereof, comprising the following steps:

[0029] (1) Weigh 40 parts of styrene-ethylene / propylene-styrene block copolymer (SEPS), 38 parts of SEBS, 24 parts of white oil, 5 parts of polypropylene, 8 parts of compatibilizer, 7 parts of talc, 3 parts of silicone, 0.2 parts of antioxidant 168, 0.2 parts of pentaerythritol stearate, and 0.6 parts of titanium dioxide in sequence.

[0030] (2) First, add SEBS and white oil into a high-speed mixer, stir at a speed of 1000 r / min for 2 minutes, then add SIS and stir thoroughly. Let it stand for 30 minutes to allow the rubber powder to be fully filled with oil.

[0031] (3) Slowly add the remaining raw materials into the mixer and stir at 1000 r / min for 2 min to obtain a premix.

[0032] (4) The premix is ​​added into the lower hopper of a twin-screw extruder, plasticized by the screw, melted, cooled by a water-drawn strip, pelletized by a pelletizer, and dried to obtain a silicone-like TPE material.

[0033] Example 3

[0034] A heat-resistant high-resilience silicone-like TPE material and a preparation method thereof, comprising the following steps:

[0035] (1) Weigh 40 parts of styrene-ethylene / ethylene / propylene-styrene block copolymer (SEEPS), 37 parts of white oil, 5 parts of polypropylene, 10 parts of compatibilizer, 4 parts of calcium carbonate, 3 parts of ethyl-modified polysiloxane, 0.2 parts of antioxidant 1010, 0.1 parts of erucic acid amide and 0.6 parts of titanium dioxide in sequence.

[0036] (2) First, add SEPS and white oil into a high-speed mixer and stir at a speed of 1000 r / min for 2 minutes. Let it stand for 30 minutes to allow the rubber powder to be fully filled with oil.

[0037] (3) Slowly add the remaining raw materials into the mixer and stir at 1000 r / min for 2 min to obtain a premix.

[0038] (4) The premix is ​​added into the lower hopper of a twin-screw extruder, and the premix is ​​plasticized and melted by the screw, cooled by water drawing, pelletized by a pelletizer, and dried to obtain a silicone-like TPE material.

[0039] Comparative Example 1

[0040] A heat-resistant high-resilience silicone-like TPE material and a preparation method thereof, comprising the following steps:

[0041] (1) Weigh 40 parts of styrene-ethylene / butadiene-styrene block copolymer (SEBS), 38 parts of white oil, 5 parts of polypropylene, 3 parts of PP modified polysiloxane, 7 parts of calcium carbonate, 0.2 parts of antioxidant 1010, 0.1 parts of erucic acid amide and 0.6 parts of titanium dioxide in sequence.

[0042] (2) First, add SEBS and white oil into a high-speed mixer respectively, stir at a speed of 1000 r / min for 2 minutes, and let it stand for 30 minutes to allow the rubber powder to be fully filled with oil.

[0043] (3) Slowly add the remaining raw materials into the mixer and stir at 1000 r / min for 2 min to obtain a premix.

[0044] (4) The premix is ​​added into the lower hopper of a twin-screw extruder, and the premix is ​​plasticized and melted by the screw, cooled by water drawing, pelletized by a pelletizer, and dried to obtain a silicone-like TPE material.

[0045] Comparative Example 2

[0046] A heat-resistant high-resilience silicone-like TPE material and a preparation method thereof, comprising the following steps:

[0047] (1) Weigh 40 parts of styrene-ethylene / propylene-styrene block copolymer (SEPS), 36 parts of white oil, 5 parts of polypropylene, 7 parts of talc, 3 parts of silicone, 0.2 parts of antioxidant 168, 0.2 parts of pentaerythritol stearate, and 0.6 parts of titanium dioxide in sequence.

[0048] (2) First, add SEPS and white oil into a high-speed mixer separately, stir at a speed of 1000r / min for 2 minutes, then add SEPS and stir thoroughly, and let it stand for 30 minutes to allow the rubber powder to be fully filled with oil.

[0049] (3) Slowly add the remaining raw materials into the mixer and stir at 1000 r / min for 2 min to obtain a premix.

[0050] (4) The premix is ​​added into the lower hopper of a twin-screw extruder, plasticized by the screw, melted, cooled by water drawing, pelletized by a pelletizer, and dried to obtain a finished product.

[0051] Comparative Example 3

[0052] A heat-resistant high-resilience silicone-like TPE material and a preparation method thereof, comprising the following steps:

[0053] (1) Weigh 40 parts of styrene-ethylene / ethylene / propylene-styrene block copolymer (SEEPS), 37 parts of white oil, 5 parts of polypropylene, 7 parts of calcium carbonate, 3 parts of ethyl-modified polysiloxane, 0.2 parts of antioxidant 1010, 0.1 parts of erucic acid amide, and 0.6 parts of titanium dioxide in sequence.

[0054] (2) First, add SEEPS and white oil into a high-speed mixer, stir at a speed of 1000 r / min for 2 minutes, and let it stand for 30 minutes to allow the rubber powder to be fully filled with oil.

[0055] (3) Slowly add the remaining raw materials into the mixer and stir at 1000 r / min for 2 min to obtain a premix.

[0056] (4) The premix is ​​added into the lower hopper of a twin-screw extruder, and the premix is ​​plasticized and melted by the screw, cooled by water drawing, pelletized by a pelletizer, and dried to obtain a silicone-like TPE material.

[0057] The silicone-like TPE thermoplastic elastomers of the above Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to permanent compression set tests, and the results are shown in Table 1. The compression set was tested using ISO 815-1, -2.

[0058] Table 1

[0059]

[0060] In summary, the imitation silica gel prepared by the present invention has good resilience at both room temperature and high temperature through the ratio of different components, and has obvious advantages in temperature resistance and resilience.

[0061] The present invention has high resilience and low permanent deformation. From the compression permanent deformation test results in Table 1, it can be seen that the compression permanent deformation values ​​of Examples 1, 2 and 3 of the present invention at room temperature (22°C) and high temperature (70°C) are significantly lower than those of Comparative Examples 1, 2 and 3. This shows that by optimizing the formula design (rationally selecting the type and proportion of block copolymers, lubricants, silicones and compatibilizers, etc.), the silicone-like TPE material prepared by the present invention has significant advantages in resilience and can better maintain shape and performance.

[0062] It has excellent temperature resistance. The silicone-like TPE material in the embodiment shows a lower compression permanent deformation (such as only 33.56% in Example 3) under high temperature (70°C), which is significantly better than the comparative example. This shows that the material has excellent dimensional stability and resilience under high temperature conditions, and can meet the use requirements in more harsh environments. The formula is highly adjustable. The present invention significantly improves the comprehensive performance of the material by flexibly combining different types of block copolymers (such as SEBS, SEPS and SEEPS) with additives such as fillers, lubricants and silicones. The adjustment of different formulas can meet the requirements of different products for resilience, temperature resistance and touch, and has broad application potential.

[0063] Taking into account both environmental protection and economy, white oil is used as a plasticizer. Compared with traditional silicone materials, the silicone-like TPE material of the present invention has a lower raw material cost and can be quickly formed and recycled through thermoplastic processing, reducing production costs and environmental burdens. The processing performance is excellent. The present invention adopts twin-screw extrusion technology, combined with a reasonable temperature range and screw speed, so that each component can be fully mixed and plasticized. The melt blending is uniform during the preparation process, and the obtained TPE material has excellent process stability and consistency, further improving production efficiency.

[0064] The present invention solves the problem of insufficient performance of existing silicone-like TPE materials. Aiming at the problems of insufficient resilience, poor temperature resistance and low processing dimensional stability of silicone-like TPE materials on the market, the present invention provides a silicone-like TPE material with high resilience and high temperature resistance by reasonably designing material formula and process flow. Achieving alternative materials with performance comparable to silicone. The present invention aims to develop a material that can be comparable to silicone in terms of touch, resilience and temperature resistance, while retaining the advantages of TPE materials with short processing cycle and recyclability, providing a more economical and environmentally friendly alternative for silicone products. Meeting application requirements in different fields By optimizing the formula and process conditions, the material of the present invention is not only suitable for general industrial use, but can also be used in high-demand fields such as food and medical care, meeting the needs of various industries for high-performance soft elastic materials.

[0065] In summary, the present invention significantly improves the resilience, temperature resistance and processability of the silicone-like TPE material through innovative formula design and optimized processing technology, providing a high-quality solution to the current market demand for high-performance, environmentally friendly silicone-like materials.

[0066] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A method for preparing a heat-resistant and high-resilience silicone-like TPE material, characterized in that: The steps include: Step 1, using 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane as an initiator, olefin block copolymer (OBC) and glycidyl methacrylate (GMA) as grafting monomers, melt blending through a twin-screw extruder, extrusion granulation, and vacuum drying to prepare a grafted product; Step 2: Add the styrene-ethylene block copolymer and white oil into a high-speed mixer according to a certain proportion, mix at a speed of 1000 r / min for 2 minutes, and then let it stand for 30 minutes to allow the rubber powder to fully absorb the oil; Step 3: Add compatibilizer, reinforcing filler and antioxidant into a high speed mixer and mix for 2 minutes at a speed of 1000 r / min. Step 4, after the materials are mixed, they are added into a twin-screw extruder for extrusion granulation, melt reaction in the screw, plasticization molding and extrusion, the material strips are cooled by a water tank, and then pelletized by a pelletizer to obtain the olefin thermoplastic elastomer with imitation silicone feel; wherein, the processing technology of the twin-screw extruder is as follows: the temperature of the first zone of the twin-screw extruder is 120-140°C, the temperature of the second zone is 190-210°C, the temperature of the third zone is 190-210°C, the temperature of the fourth zone is 190-210°C, the temperature of the fifth zone is 190-210°C, the temperature of the sixth zone is 190-210°C, the temperature of the seventh zone is 190-210°C, the temperature of the eighth zone is 190-210°C, the temperature of the ninth zone is 190-210°C, the temperature of the tenth zone is 180-190°C, the screw speed is 250-300r / min, and the finished product is dried in an oven.

2. The method for preparing a heat-resistant and high-resilience silicone-like TPE material according to claim 1, characterized in that: The styrene-ethylene / butadiene-styrene in step 2 is one or a mixture of two or more of SEBS, SIS, SEPS and SEEPS.

3. The method for preparing a heat-resistant and high-resilience silicone-like TPE material according to claim 1, characterized in that: The reinforcing filler in step 2 is one or a mixture of two or more of calcium carbonate, talcum powder and mica powder.

4. The method for preparing a heat-resistant and high-resilience silicone-like TPE material according to claim 1, characterized in that: The lubricant in step 2 is one or a mixture of two or more of erucamide, pentaerythritol stearate, EBS and calcium stearate.

5. The method for preparing a heat-resistant and high-resilience silicone-like TPE material according to claim 1, characterized in that: The antioxidant in step three is one or a mixture of two or more of antioxidants 1010, 168 and DSTDP.

6. A silicone-like TPE material, characterized in that: The silicone-like TPE material comprises a TPE thermoplastic elastomer prepared by the method for preparing the silicone-like TPE material according to any one of claim 15.

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