New composite material for wheel outer ring encapsulation and preparation method thereof

Abstract

The invention discloses a novel composite material for wheel outer ring encapsulation and a preparation method thereof. Carboxymethyl starch, chitosan derivatives, fetal shell mucin, water-white rosin and carboxymethyl starch are compounded, and their properties are integrated. Under the auxiliary dissolution of anhydrous ethanol and water, the obtained compatibilizer can easily form a coating film on the surface of the natural filler, thereby further improving the compatibility of the natural filler and the cellulose aerogel, so that the obtained TPE composite material has better biodegradation efficiency and better mechanical properties, such as softness and tear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of rubber coating materials, and more specifically, to a new composite material for rubber coating of a wheel outer ring and a preparation method thereof. Background Art

[0002] TPE is a thermoplastic elastomer material with high strength, high resilience, and injection molding characteristics. It has a wide range of applications, is environmentally friendly, non-toxic and safe, has excellent colorability, soft touch, weather resistance, fatigue resistance and temperature resistance, excellent processing performance, no need for vulcanization, and can be recycled to reduce costs. It can be secondary injection molded, coated and bonded with base materials such as PP, PE, PC, PS, ABS, or molded alone. TPE is widely used in medical, sports equipment, instruments and tools, household daily necessities, food packaging, electronic products, automobiles and other fields. The coating is based on the compatibility of thermoplastic elastomers and hard plastics when softened and melted. The better the compatibility of the two materials, the easier it is to bond. A bonding layer is formed on the contact surface between the hard glue and the soft glue, which greatly improves the adhesion of the thermoplastic elastomer and the hard plastic. The secondary coating molding process is widely used in the fields of automobiles, home appliances and consumer products because it can improve the sealing, aesthetics, convenience and other characteristics of the product structure. ABS coated TPE is a very important application of thermoplastic elastomers, such as the power tool industry, electronic appliances, and the automotive industry. ABS coated TPE generally plays a role in shock absorption and soft touch. At present, the flame retardant modification of thermoplastic polyurethane elastomers mainly adds flame retardants for flame retardancy; the added flame retardant is mainly inorganic metal compound flame retardant, such as magnesium hydroxide, expanded graphite, etc., but the inorganic metal compound flame retardant has poor compatibility with the elastomer matrix. A small amount of addition will not have a flame retardant effect, and a large amount of addition will affect the mechanical properties of the elastomer. The TPE composite materials of the existing technology are generally difficult to recycle and are usually directly discarded. Because TPE materials are difficult to degrade in the natural environment, because it is a polymer compound and is not easily decomposed by microorganisms. A large amount of TPE materials are accumulated, causing environmental pollution. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the problems existing in the prior art, the present invention provides a new composite material for wheel outer ring encapsulation and a preparation method thereof to solve the technical problems mentioned in the background technology.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a new composite material for wheel outer ring encapsulation, comprising the following raw materials in parts by weight: 6-10 parts of TPE elastomer, 5-15 parts of modified carbon black, 12-15 parts of polylactic acid, 10-12 parts of talc, 12-25 parts of hydrogenated styrene elastomer, 2-4 parts of antioxidant, 3-6 parts of cellulose aerogel, 5-10 parts of modified negative ion powder, 18-22 parts of compatible flame retardant copolymer, 6-12 parts of polyolefin grafted maleic anhydride, 1-3 parts of stabilizer, 5-10 parts of acrylate block copolymer, 8-35 parts of natural filler and 5-8 parts of catalyst, the TPE elastomer is SEBS, and the content of PS in the SEBS is ≤22%; the acrylate block copolymer is methyl methacrylate-acrylate-methyl methacrylate block copolymer.

[0007] The present invention is further configured such that the catalyst is polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate.

[0008] The present invention is further configured such that the acrylic ester block copolymer is one or more of a methyl methacrylate-methyl acrylate-methyl methacrylate block copolymer, a methyl methacrylate-ethyl acrylate-methyl methacrylate block copolymer, a methyl methacrylate-propyl acrylate-methyl methacrylate block copolymer, and a methyl methacrylate-butyl acrylate-methyl methacrylate block copolymer.

[0009] The present invention is further configured as follows: the compatibilizer is one or two of a maleic anhydride grafted styrene elastomer and a maleic anhydride grafted polyolefin elastomer; the maleic anhydride grafted styrene elastomer is selected from one or more of maleic anhydride grafted hydrogenated poly(styrene-b-isoprene), hydrogenated poly(styrene-b-butadiene-b-styrene), hydrogenated poly(styrene-b-isoprene-b-styrene), and hydrogenated poly(styrene-b-isoprene / butadiene-b-styrene); the maleic anhydride grafted polyolefin elastomer is maleic anhydride grafted POE.

[0010] The present invention is further configured such that the lubricant is at least one of glyceryl monostearate, liquid paraffin, polyethylene wax, and zinc stearate.

[0011] The present invention is further configured such that the content of PS in the SEBS is 11-20%.

[0012] The present invention is further configured that the natural filler is a natural filler treated with a compatibilizer, and the compatibilizer includes the following raw materials in parts by weight: 0.5-1 part of carboxymethyl starch, 10-18 parts of water, 2-5 parts of chitosan derivatives, 0.2-0.8 parts of fetal shell mucin, 0.5-1.5 parts of water-white rosin, and 20-30 parts of anhydrous ethanol.

[0013] The present invention is further configured that the compatible flame-retardant copolymer comprises the following components in parts by weight: 6-12 parts of lignin, 8-9 parts of coconut shell powder, and 2-6 parts of modified waste rubber powder.

[0014] The present invention also includes a method for preparing a novel composite material for wheel outer ring encapsulation, comprising the following steps:

[0015] Step 1: Put TPE elastomer, modified carbon black, modified anion powder and lubricant into an internal mixer for mixing to obtain a premix. At the same time, weigh natural filler and cellulose aerogel in proportion and stir and react at a temperature of 125-135° C. for 3-5 hours to obtain a mixture.

[0016] Step 2: Weigh the remaining thermoplastic elastomer, polylactic acid, talcum powder, hydrogenated styrene elastomer, antioxidant, compatible flame retardant copolymer, polyolefin grafted maleic anhydride, stabilizer and other materials in proportion, and stir and blend them with the mixture obtained in step 1 to obtain a uniform mixture;

[0017] Step 3: Under a nitrogen atmosphere, add polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate catalyst to the reaction bottle, react at 75-90°C for 2-4h, add diol phosphate POSS, continue to react for 0.5-1h, then cool to 40-50°C, add triethylamine to adjust the pH to 8-9, distill under reduced pressure, and obtain high-performance TPU material after drying;

[0018] Step 4: Based on step 2, add polyurethane elastomer and high-performance TPU material into the mixer, mix for 5-10 minutes at a speed of 50-70r / min and a temperature of 140-160°C, and then place in a flat vulcanizer for vulcanization for 3-6 minutes to obtain TPE material.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the present invention provides a new composite material for wheel outer ring rubber encapsulation and a preparation method thereof, which has the following beneficial effects:

[0021] The present invention is compounded by carboxymethyl starch, chitosan derivatives, fetal mucin, water white rosin, and carboxymethyl starch, and their performances are comprehensively considered. Under the auxiliary dissolution of anhydrous ethanol and water, the obtained compatibilizer is easy to form a coating film on the surface of the natural filler, thereby further improving the compatibility of the natural filler and the cellulose aerogel, so that the obtained TPE composite material has better biodegradation efficiency, and has better mechanical properties, such as softness and tear strength. In addition, after the carbon black is nitrogen-doped, zinc oxide is modified on the surface to obtain modified carbon black, and the interaction between the modified carbon black and the TPE material is stronger, which improves the mechanical properties of the TPE material to a certain extent. The introduction of zinc oxide also gives the TPE material good antibacterial properties. At the same time, the negative ion powder is refluxed in an organic solvent containing a silane coupling agent to obtain the modified negative ion powder, which improves its interaction with the TPE material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The overall flow chart of the preparation method of the new composite material for the outer ring of the wheel of the present invention; DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0025] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0026] The new composite material for wheel outer ring encapsulation comprises the following raw materials in parts by weight: 6-10 parts of TPE elastomer, 5-15 parts of modified carbon black, 12-15 parts of polylactic acid, 10-12 parts of talc, 12-25 parts of hydrogenated styrene elastomer, 2-4 parts of antioxidant, 3-6 parts of cellulose aerogel, 5-10 parts of modified negative ion powder, 18-22 parts of compatible flame retardant copolymer, 6-12 parts of polyolefin grafted maleic anhydride, 1-3 parts of stabilizer, 5-10 parts of acrylate block copolymer, 8-35 parts of natural filler and 5-8 parts of catalyst, wherein the TPE elastomer is SEBS, the content of PS in the SEBS is ≤22%; the acrylate block copolymer is methyl methacrylate-acrylate-methyl methacrylate block copolymer.

[0027] In a further embodiment of the present invention, the catalyst is polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate.

[0028] In a further embodiment of the present invention, the acrylic block copolymer is one or more of methyl methacrylate-methyl acrylate-methyl methacrylate block copolymer, methyl methacrylate-ethyl acrylate-methyl methacrylate block copolymer, methyl methacrylate-propyl acrylate-methyl methacrylate block copolymer, and methyl methacrylate-butyl acrylate-methyl methacrylate block copolymer.

[0029] In a further embodiment of the present invention, the compatibilizer is one or two of a maleic anhydride grafted styrene elastomer and a maleic anhydride grafted polyolefin elastomer; the maleic anhydride grafted styrene elastomer is selected from one or more of maleic anhydride grafted hydrogenated poly(styrene-b-isoprene), hydrogenated poly(styrene-b-butadiene-b-styrene), hydrogenated poly(styrene-b-isoprene-b-styrene), and hydrogenated poly(styrene-b-isoprene / butadiene-b-styrene); the maleic anhydride grafted polyolefin elastomer is maleic anhydride grafted POE; the lubricant The lubricant is at least one of monostearate glyceryl, liquid paraffin, polyethylene wax, and zinc stearate; the content of PS in the SEBS is 11-20%; the natural filler is a natural filler treated with a compatibilizer, and the compatibilizer comprises the following raw materials in parts by weight: 0.5-1 part of carboxymethyl starch, 10-18 parts of water, 2-5 parts of chitosan derivatives, 0.2-0.8 parts of fetal shell mucin, 0.5-1.5 parts of water-white rosin, and 20-30 parts of anhydrous ethanol; the compatible flame-retardant copolymer comprises the following components in parts by weight: 6-12 parts of lignin, 8-9 parts of coconut shell powder, and 2-6 parts of modified waste rubber powder.

[0030] Embodiment 2:

[0031] Reference Figure 1 The present invention also includes a method for preparing a new composite material for wheel outer ring encapsulation, comprising the following steps:

[0032] Step 1: 6 parts of TPE elastomer, 5 parts of modified carbon black, 12 parts of polylactic acid, 10 parts of talc, 12 parts of hydrogenated styrene elastomer, 2 parts of antioxidant, 3 parts of cellulose aerogel, 5 parts of modified negative ion powder, 18 parts of compatible flame retardant copolymer, 6 parts of polyolefin grafted maleic anhydride, 1 part of stabilizer, 5 parts of acrylate block copolymer, 8 parts of natural filler and 5 parts of catalyst are put into an internal mixer for mixing to obtain a premix. At the same time, the natural filler is weighed in proportion and the cellulose aerogel is stirred and reacted at a temperature of 125-135°C for 3-5 hours to obtain a mixture;

[0033] Step 2: Weigh the remaining thermoplastic elastomer, polylactic acid, talcum powder, hydrogenated styrene elastomer, antioxidant, compatible flame retardant copolymer, polyolefin grafted maleic anhydride, stabilizer and other materials in proportion, and stir and blend them with the mixture obtained in step 1 to obtain a uniform mixture;

[0034] Step 3: Under a nitrogen atmosphere, add polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate catalyst to the reaction bottle, react at 75°C for 2h, add diol phosphate POSS, continue to react for 0.5h, then cool to 40°C, add triethylamine to adjust the pH to 8, distill under reduced pressure, and obtain high-performance TPU material after drying;

[0035] Step 4: Based on step 2, add polyurethane elastomer and high-performance TPU material into the mixer, mix at a speed of 50 r / min and a temperature of 140°C for 5 minutes, and then place it in a flat vulcanizer for vulcanization for 3 minutes to obtain TPE material.

[0036] Embodiment 3:

[0037] Reference Figure 1 The present invention also includes a method for preparing a new composite material for wheel outer ring encapsulation, comprising the following steps:

[0038] Step 1: 10 parts of TPE elastomer, 15 parts of modified carbon black, 15 parts of polylactic acid, 12 parts of talc, 25 parts of hydrogenated styrene elastomer, 4 parts of antioxidant, 6 parts of cellulose aerogel, 10 parts of modified negative ion powder, 22 parts of compatible flame retardant copolymer, 12 parts of polyolefin grafted maleic anhydride, 3 parts of stabilizer, 10 parts of acrylate block copolymer, 35 parts of natural filler and 8 parts of catalyst, wherein the TPE elastomer is SEBS, and the content of PS in the SEBS is ≤22%; the acrylate block copolymer is methyl methacrylate-acrylate-methyl methacrylate block copolymer, which is put into an internal mixer for mixing to obtain a premix, and at the same time, the natural filler is weighed in proportion and the cellulose aerogel is stirred and reacted at a temperature of 125-135°C for 3-5h to obtain a mixture;

[0039] Step 2: Weigh the remaining thermoplastic elastomer, polylactic acid, talcum powder, hydrogenated styrene elastomer, antioxidant, compatible flame retardant copolymer, polyolefin grafted maleic anhydride, stabilizer and other materials in proportion, and stir and blend them with the mixture obtained in step 1 to obtain a uniform mixture;

[0040] Step 3: Under a nitrogen atmosphere, add polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate catalyst to the reaction bottle, react at 90°C for 4h, add diol phosphate POSS, continue to react for 1h, then cool to 50°C, add triethylamine to adjust the pH to 9, distill under reduced pressure, and obtain high-performance TPU material after drying;

[0041] Step 4: Based on step 2, add polyurethane elastomer and high-performance TPU material into the mixer, mix at a speed of 70r / min and a temperature of 160°C for 10 minutes, and then place it in a flat vulcanizer for vulcanization for 6 minutes to obtain TPE material.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The wheel outer ring is covered with a new composite material, which is characterized by: The invention comprises the following raw materials in parts by weight: 6-10 parts of TPE elastomer, 5-15 parts of modified carbon black, 12-15 parts of polylactic acid, 10-12 parts of talc, 12-25 parts of hydrogenated styrene elastomer, 2-4 parts of antioxidant, 3-6 parts of cellulose aerogel, 5-10 parts of modified negative ion powder, 18-22 parts of compatible flame retardant copolymer, 6-12 parts of polyolefin grafted maleic anhydride, 1-3 parts of stabilizer, 5-10 parts of acrylate block copolymer, 8-35 parts of natural filler and 5-8 parts of catalyst. The TPE elastomer is SEBS, and the content of PS in the SEBS is ≤22%; the acrylate block copolymer is methyl methacrylate-acrylate-methyl methacrylate block copolymer.

2. The new composite material for wheel outer ring rubber encapsulation according to claim 1 is characterized by: The catalyst is polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate.

3. The new composite material for wheel outer ring rubber encapsulation according to claim 1 is characterized by: The acrylic acid ester block copolymer is one or more of methyl methacrylate-methyl acrylate-methyl methacrylate block copolymer, methyl methacrylate-ethyl acrylate-methyl methacrylate block copolymer, methyl methacrylate-propyl acrylate-methyl methacrylate block copolymer, and methyl methacrylate-butyl acrylate-methyl methacrylate block copolymer.

4. The new composite material for wheel outer ring rubber encapsulation according to claim 3 is characterized by: The compatibilizer is one or two of a maleic anhydride grafted styrene elastomer and a maleic anhydride grafted polyolefin elastomer; the maleic anhydride grafted styrene elastomer is selected from one or more of maleic anhydride grafted hydrogenated poly(styrene-b-isoprene), hydrogenated poly(styrene-b-butadiene-b-styrene), hydrogenated poly(styrene-b-isoprene-b-styrene), and hydrogenated poly(styrene-b-isoprene / butadiene-b-styrene); the maleic anhydride grafted polyolefin elastomer is maleic anhydride grafted POE.

5. The new composite material for wheel outer ring rubber encapsulation according to claim 3 is characterized by: The lubricant is at least one of glyceryl monostearate, liquid paraffin, polyethylene wax and zinc stearate.

6. The new composite material for wheel outer ring rubber encapsulation according to claim 4 is characterized by: The content of PS in the SEBS is 11-20%.

7. The new composite material for wheel outer ring rubber encapsulation according to claim 1 is characterized by: The natural filler is a natural filler treated with a compatibilizer, and the compatibilizer comprises the following raw materials in parts by weight: 0.5-1 part of carboxymethyl starch, 10-18 parts of water, 2-5 parts of chitosan derivatives, 0.2-0.8 parts of fetal shell mucin, 0.5-1.5 parts of water-white rosin, and 20-30 parts of anhydrous ethanol.

8. The new composite material for wheel outer ring rubber encapsulation according to claim 7 is characterized by: The compatible flame-retardant copolymer comprises the following components in parts by weight: 6-12 parts of lignin, 8-9 parts of coconut shell powder, and 2-6 parts of modified waste rubber powder.

9. The present invention also includes a method for preparing a new composite material for wheel outer ring rubber coating, using the new composite material for wheel outer ring rubber coating as described in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Put TPE elastomer, modified carbon black, modified anion powder and lubricant into an internal mixer for mixing to obtain a premix. At the same time, weigh natural filler and cellulose aerogel in proportion and stir and react at a temperature of 125-135° C. for 3-5 hours to obtain a mixture. Step 2: Weigh the remaining thermoplastic elastomer, polylactic acid, talcum powder, hydrogenated styrene elastomer, antioxidant, compatible flame retardant copolymer, polyolefin grafted maleic anhydride, stabilizer and other materials in proportion, and stir and blend them with the mixture obtained in step 1 to obtain a uniform mixture; Step 3: Under a nitrogen atmosphere, add polycaprolactone polyol, isophorone diisocyanate and dibutyltin dilaurate catalyst to the reaction bottle, react at 75-90°C for 2-4h, add diol phosphate POSS, continue to react for 0.5-1h, then cool to 40-50°C, add triethylamine to adjust the pH to 8-9, distill under reduced pressure, and obtain high-performance TPU material after drying; Step 4: Based on step 2, add polyurethane elastomer and high-performance TPU material into the mixer, mix for 5-10 minutes at a speed of 50-70r / min and a temperature of 140-160°C, and then place in a flat vulcanizer for vulcanization for 3-6 minutes to obtain TPE material.

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