Polypropylene fused aerogel high-resilience cloud wool and preparation method thereof
By combining nano-SiO2 aerogel powder modified with specific crosslinking agents and silane coupling agents in a polypropylene resin matrix with polyolefin elastomers, a highly elastic network is formed, which solves the problem of poor interfacial compatibility between aerogel and fiber matrix, achieving a synergistic effect of high resilience and excellent thermal insulation performance, and improving the fluffy and warm insulation performance of clothing fillings.
Patent Information
- Application Number
- CN202511920605.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-02-27
AI Technical Summary
In existing technologies, the poor interfacial compatibility between aerogel and fiber matrix leads to easy shedding and powdering of aerogel. Furthermore, the brittle outer aerogel layer increases the material density and hardens the feel, making it difficult to achieve an effective synergy between thermal insulation performance and high elasticity, and thus failing to meet the long-term requirements for fluffy warmth in clothing fillings.
A crosslinking agent composed of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-trimethyl]tri-2,1-ethylene glycol ester and triallyl isocyanurate is used, combined with hydrophobic nano-SiO2 aerogel powder modified with silane coupling agent and polyolefin elastomer, which is uniformly dispersed in a polypropylene resin matrix to form a highly elastic network, and the interfacial bonding is enhanced by KH-560 modification.
It achieves a synergistic effect of high resilience and excellent thermal insulation performance in composite cloud fleece materials, improves the mechanical strength and durability of the materials, solves the problems of aerogel shedding and density increase, and meets the long-term fluffy and warm requirements of clothing fillings.
Smart Images
Figure SMS_1
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of high polymer composite materials, in particular to a polypropylene melt aerogel high-rebound down and a preparation method thereof. BACKGROUND
[0002] In the field of clothing warmth, the development of high-performance filling materials is crucial to improve the lightness and comfort of clothing. Traditional materials such as down and chemical fibers have their own limitations: down is afraid of moisture and is expensive; chemical fiber filling has problems such as poor loft durability, low thermal efficiency, and bulky clothing. Therefore, the market urgently needs a new material that combines ultra-lightness, high warmth, high resilience, and weather resistance to meet the extreme pursuit of "light warmth and loft" in high-end outdoor and daily clothing.
[0003] Aerogels are considered a potential solution to break through the limits of thermal insulation materials due to their excellent thermal insulation performance brought by their nano-porous structure. Currently, the common technical path for applying aerogels to textiles is to composite with fiber substrates, that is, to load inorganic aerogels (such as silicon dioxide) on the surface of polypropylene fibers or the like through coating, filling or surface modification, so as to improve the thermal insulation performance of the material.
[0004] However, the above methods have fundamental defects: first, the inorganic aerogel and the fiber substrate are only physically combined, with poor interfacial compatibility, which can cause the aerogel to fall off and powder in actual use, affecting durability and wearing comfort; second, the brittle aerogel layer or filler attached externally will significantly increase the material density, harden the hand feeling, and severely restrict the elasticity of the fiber network that should have. Even if the aerogel formula or the fiber surface is modified and optimized, it is difficult to achieve effective coordination between the thermal insulation performance of the aerogel and the high elasticity of the fiber substrate, and the rebound performance of the resulting composite material is still insufficient after repeated compression, making it difficult to meet the core requirement of clothing fillers to maintain loft and warmth for a long time. Therefore, developing a composite material that can achieve both thermal insulation performance and high elasticity is a key technical challenge to obtain the next generation of high-performance clothing thermal insulation materials. SUMMARY
[0005] In order to make the composite down material have high elasticity and excellent thermal insulation performance, the application provides a polypropylene melt aerogel high-rebound down and a preparation method thereof.
[0006] In a first aspect, the application provides a polypropylene melt aerogel high-rebound down, which adopts the following technical solution: The polypropylene melt aerogel high-resilience down is prepared from the following components in parts by weight: polypropylene resin matrix 75-85 parts, hydrophobic nano-SiO2 aerogel powder 8-12 parts, polyolefin elastomer 6-10 parts, compatibilizer 3-5 parts, foaming agent 0.5-0.9 parts, initiator 0.5-1.0 parts, crosslinking agent 0.3-0.6 parts, and antioxidant 0.2-0.3 parts, wherein the surface of the hydrophobic nano-SiO2 aerogel powder is modified by a silane coupling agent, and the crosslinking agent comprises 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and triallyl isocyanurate.
[0007] The inventors have found that the use of a crosslinking agent compounded from 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and triallyl isocyanurate, in combination with the uniform dispersion of the polyolefin elastomer in the polypropylene resin matrix, and the surface modification of the hydrophobic nano-SiO2 aerogel powder by a silane coupling agent, enables the composite down material to have both high resilience and excellent thermal insulation performance.
[0008] Specifically, each 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester molecule has three thiol groups, which can undergo ring-opening addition reactions with the carbon-carbon double bonds on the polyolefin elastomer and the carbon-carbon double bonds on the triallyl isocyanurate molecule under high-temperature processing conditions, forming thioether bonds and constructing a three-dimensional elastic network. Since the thioether bonds are reversible, they can reorganize after absorbing external force, enabling the composite down material to have a high elasticity effect similar to the self-repairing ability of rubber. At the same time, the rigid triazine ring on the triallyl isocyanurate molecule restricts the excessive flow of the molecular chain, thereby reducing the risk of permanent deformation of the composite down material under long-term stress.
[0009] The surface modification of the hydrophobic nano-SiO2 aerogel powder by a silane coupling agent enables one end of the silane coupling agent (such as KH-560) to hydrolyze and condense to form a silanol group, which forms a covalent bond with the hydroxyl group on the surface of the hydrophobic nano-SiO2 aerogel powder, thereby anchoring the epoxy group on the surface of the hydrophobic nano-SiO2 aerogel powder. The epoxy group can undergo nucleophilic ring-opening reactions with the thiol group under high-temperature processing conditions to form a covalent bond, thereby enhancing the interfacial bonding between the hydrophobic nano-SiO2 aerogel powder and the 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester, achieving uniform dispersion of the hydrophobic nano-SiO2 aerogel powder, and improving the thermal insulation and mechanical strength of the composite down material.
[0010] The present application unexpectedly obtains the synergistic effect of high resilience and excellent thermal insulation of the composite cloud material by constructing an elastic network with the crosslinking agent of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl] tri-2,1-ethanediol ester and triallyl isocyanurate and uniformly dispersed aerogel with a polyolefin elastomer.
[0011] In a specific embodiment, the mass ratio of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl] tri-2,1-ethanediol ester and triallyl isocyanurate is (1-1.2):1.
[0012] The mass ratio of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl] tri-2,1-ethanediol ester and triallyl isocyanurate is controlled within the above range, so that the composite cloud material has the effects of high crosslinking efficiency, uniform network structure, stable resilience performance, and excellent mechanical toughness.
[0013] When the content of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl] tri-2,1-ethanediol ester is too high, the high activity of the thiol crosslinking agent leads to too fast crosslinking reaction rate, and early crosslinking easily occurs during melt blending, causing the melt viscosity to sharply increase and the processing fluidity to decrease, and even the melt to rupture; at the same time, the excessive thiol groups compete with the free radicals decomposed by the initiator, and part of the free radicals are wasted, resulting in reduced crosslinking efficiency of the allyl crosslinking agent, insufficient crosslinking network density, and easy network relaxation, resilience performance degradation, and mechanical strength decrease of the composite cloud material during long-term use.
[0014] When the content of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl] tri-2,1-ethanediol ester is too low, the fast crosslinking reaction initiated by the thiol crosslinking agent is insufficient, and the preliminary network construction is insufficient; although the allyl crosslinking agent can provide high-density crosslinking points, it is easy to form local rigid nodes due to the lack of uniform preliminary network support, resulting in uneven overall crosslinking network of the material, easy brittle fracture in the rigid node region, and easy permanent deformation in the elastic region due to insufficient crosslinking, finally resulting in decreased resilience rate, reduced elongation at break, and poor toughness of the material.
[0015] In a specific embodiment, the silane coupling agent is KH-560.
[0016] The hydrophobic nano-SiO2 aerogel powder is modified by KH-560, so that the alkoxysilane groups of KH-560 and the hydroxyl groups on the surface of the aerogel undergo hydrolysis and condensation reaction to form chemical bonds, covering the polar sites on the surface of the aerogel; the compatibilizer is closely compatible with the polypropylene resin matrix by molecular compatibility, van der Waals force and molecular chain entanglement, and then the epoxy groups react with the active groups (such as carboxyl groups) of the compatibilizer to realize the interfacial bonding of the aerogel and the polypropylene resin matrix, and improve the mechanical properties of the composite cloud material.
[0017] In a specific implementable embodiment, the compatibilizer is selected from one or more of SEBS-g-MAH and PP-g-MAH; preferably, the compatibilizer is SEBS-g-MAH.
[0018] Compared with PP-g-MAH for improving the interfacial bonding between the surface-modified aerogel and the polypropylene resin matrix, SEBS-g-MAH has a unique "elastic segment-active segment" structure, which can further realize the interfacial bonding between the polyolefin elastomer, the aerogel and the polypropylene resin matrix.
[0019] The ethylene-butene segment of SEBS is similar in structure to the molecular chain of the polyolefin elastomer, has excellent compatibility, and can form a continuous elastic network with the polyolefin elastomer, while the styrene segment of SEBS has good compatibility with the polypropylene resin matrix, which can simultaneously enhance the interfacial bonding between the compatibilizer and the polypropylene resin matrix; the carboxyl group of MAH as an active segment can form a stable chemical bond with the epoxy group on the surface of the aerogel, thereby further enhancing the interfacial bonding between the aerogel and the polypropylene resin matrix. Therefore, using SEBS-g-MAH as a compatibilizer can simultaneously improve the interfacial bonding between the polyolefin elastomer, the aerogel and the polypropylene resin matrix, further enhance the mechanical properties of the composite cloud material, and greatly improve the dispersion effect of each component in the polypropylene resin matrix.
[0020] In a specific implementable embodiment, the foaming agent is azodicarbonamide.
[0021] Azodicarbonamide is stable in the mixing stage at 60-80°C and decomposes at the melt temperature of the extruder (160-180°C) to produce nitrogen and a trace amount of carbon dioxide. The decomposition rate of azodicarbonamide matches the rate of free radical generation of the initiator and the rate of crosslinking reaction of the crosslinking agent. The free radicals generated by the decomposition of the initiator first initiate the activation of the molecular chains of the base material, and the crosslinking agent simultaneously builds a preliminary crosslinking network. At this time, the nitrogen gas generated by the decomposition of azodicarbonamide forms bubble nuclei in the molten system. As the crosslinking network gradually densifies, the bubble nuclei are stably bound and will not merge or rupture due to the excessively high flowability of the melt, and ultimately form uniform and fine cells. When under pressure, the gas is compressed; when the pressure is released, the gas expands and pushes the cell walls to rebound. This "airbag effect" significantly improves the resilience of the composite cloud material.
[0022] In a specific embodiment, the above-mentioned initiator is dicumyl peroxide.
[0023] Dicumyl peroxide, as a free radical initiator, decomposes at high temperature to produce two tert-butyl radicals in the plasticizing zone of the extruder. These radicals can quickly attack the main chains of the polypropylene resin matrix and the polyolefin elastomer, forming chain segment radicals. The chain segment radicals can add to the carbon-carbon double bond of triallyl isocyanurate to form a chemical bond, thereby forming a crosslinking network. The chain segment radicals can also induce 3-mercapto propionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-sulfonyl]tris-2,1-ethanediol ester and triallyl isocyanurate to build a dynamic sulfur bond network, helping to impart high resilience and fatigue resistance to the composite cloud material.
[0024] In a specific embodiment, the above-mentioned antioxidant includes antioxidant 1010 and antioxidant 168; preferably, the mass ratio of antioxidant 1010 and antioxidant 168 is 1: (1-2).
[0025] The synergistic effect of antioxidant 1010 and antioxidant 168 in the above mass ratio enables the composite cloud material to have high-efficiency heat-oxidation resistance, excellent long-term use stability, and the ability to protect the component structure from being damaged during high-temperature processing.
[0026] When the content of antioxidant 1010 is too high, the molar amount of antioxidant 168 cannot completely decompose the hydroperoxide generated by antioxidant 1010, and the residual hydroperoxide will decompose into hydroxyl radicals and alkoxy radicals under high temperature or free radical action. These highly active radicals will accelerate the degradation of polypropylene molecular chains, resulting in rapid decay of the mechanical properties of the material. At the same time, the undecomposed hydroperoxide will promote the oxidation of the hydroxyl group on the surface of the aerogel, destroying its porous structure and leading to a decrease in the thermal insulation performance of the material. When antioxidant 168 is excessive, the excess antioxidant 168 will partially volatilize during the melt processing process, resulting in effective loss of antioxidant. At the same time, the undissolved antioxidant 168 will migrate and precipitate inside the material, forming surface frost, reducing the uniform distribution of antioxidant in the matrix, and leading to insufficient antioxidant in the local area. In addition, the excess antioxidant 168 may compete with the free radicals generated by the initiator, consuming part of the free radicals and reducing the crosslinking reaction efficiency, resulting in insufficient crosslinking network density of the material, decreased resilience, and rapid decay of the antioxidant effect due to the migration of excess antioxidant 168 during long-term use.
[0027] In a second aspect, the application provides a preparation method of polypropylene melt aerogel high-resilience cloud wool, which adopts the following technical solution: A preparation method of polypropylene melt aerogel high-resilience cloud wool, comprising the following steps: S1, polypropylene resin matrix, surface silane coupling agent modified hydrophobic nano-SiO2 aerogel powder, polyolefin elastomer, and compatibilizer are put into a mixer and mixed, foaming agent and initiator are added and uniformly mixed, crosslinking agent is added and uniformly mixed, the temperature is raised to 60-80°C, antioxidant is uniformly dispersed, and a mixture is obtained; S2, the mixture of step S1 is put into an extruder for melt blending, the melt is extruded through a spinneret, dried and shaped after cooling, and a composite fiber is obtained; S3, the composite fiber in step S2 is opened by a mechanical fiber opener and then treated by a pneumatic fluffy machine to obtain the polypropylene aerogel high-resilience cloud wool.
[0028] Through the cooperation of dry premixing and melt blending step-by-step operation, the uniform dispersion of additives and the controllability of reaction are ensured, so that the polypropylene melt aerogel high-resilience cloud wool prepared according to the above steps has the excellent effects of uniform dispersion of components, complete fiber formation, high fluffiness, and stable resilience.
[0029] In summary, the application includes at least one of the following beneficial technical effects: 1、The application uses 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazino] tri-2,1-ethanediol ester and triallyl isocyanurate as a crosslinking agent, and the hydrophobic nano-SiO2 aerogel powder and the polyolefin elastomer are uniformly dispersed in the polypropylene resin matrix after being modified by a silane coupling agent, so that the composite cloud material has high resilience and excellent thermal insulation performance.
[0030] 2、The application uses KH-560 modified hydrophobic nano-SiO2 aerogel powder to anchor the epoxy groups on the surface of the hydrophobic nano-SiO2 aerogel powder, so that the epoxy groups can undergo nucleophilic ring-opening reaction with thiol groups under high-temperature processing conditions to form covalent bonds, thereby enhancing the interfacial bonding between the hydrophobic nano-SiO2 aerogel powder and 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazino] tri-2,1-ethanediol ester, achieving uniform dispersion of the hydrophobic nano-SiO2 aerogel powder, and improving the thermal insulation and mechanical strength of the composite cloud material.
[0031] 3、The application uses SEBS-g-MAH as a compatibilizer, which can simultaneously achieve interfacial bonding between the polyolefin elastomer, aerogel and polypropylene resin matrix by using its special "elastic segment-active segment" structure. DETAILED DESCRIPTION
[0032] The application will be further described in detail below in combination with examples and comparative examples: Some raw materials used in the examples and comparative examples: Polypropylene resin (brand: t30s, processing method: wire drawing grade, purchased from Suzhou Chang Yixin Plastic Co., Ltd.); Hydrophobic nano-SiO2 aerogel powder (article number: aerogel powder, specification: hydrophobic type 500g, purchased from Dacheng County Nano New Material Co., Ltd.); Polyolefin elastomer (brand: Dow 8402, purchased from Shanghai Fushengtong New Material Co., Ltd.); SEBS-g-MAH (brand: FG1901, purchased from Dongguan Zhangmutou Shengze Plastic Raw Material Business Department); PP-g-MAH (article number: M722, purchased from Dongguan Xingyuan Chemical Co., Ltd.); 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazino] tri-2,1-ethanediol ester (CAS: 36196-44-8); Triallyl isocyanurate (CAS: 1025-15-6).
[0033] The unmarked related raw materials used in the examples and comparative examples are all conventional products that can be purchased in the market.
[0034] Preparation Example 1 The surface KH-560 modified hydrophobic nano-SiO2 aerogel powder was prepared as follows: Into 500 mL of ethanol, 0.3 mL of glacial acetic acid was added, the pH of the system was adjusted to 4.5, 4 g of KH-560 was added dropwise, hydrolysis was carried out at 35 °C for 0.5 hours, 100 g of hydrophobic nano-SiO2 aerogel powder was added, the reaction was stirred at 35 °C for 2 hours, centrifugal treatment was carried out, the solid product was washed with ethanol for three times, vacuum drying was carried out at 60 °C for 4 hours, and the surface KH-560 modified hydrophobic nano-SiO2 aerogel powder was obtained. Example
[0035] Example 1 The polypropylene aerogel high resilience batting was prepared as follows: S1, 80 parts by weight of polypropylene resin matrix, 10 parts by weight of the surface silane coupling agent modified hydrophobic nano-SiO2 aerogel powder prepared in Preparation Example 1, 8 parts by weight of polyolefin elastomer, and 4 parts by weight of SEBS-g-MAH were put into a mixer and stirred uniformly, 0.7 parts by weight of azobisformamide and 0.75 parts by weight of dicumyl peroxide were added and stirred uniformly, 0.24 parts by weight of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and 0.21 parts by weight of triallyl isocyanurate were added and mixed uniformly, the temperature was raised to 70 °C, 0.1 parts by weight of antioxidant 1010 and 0.15 parts by weight of antioxidant 168 were uniformly dispersed, and a mixture was obtained; S2, the mixture in step S1 was put into an extruder for melt blending, the melt was extruded through a spinneret, dried and shaped after cooling, and a composite fiber was obtained; S3, the composite fiber in step S2 was opened by a mechanical fiber opener and was subjected to a fluffy treatment by an air flow fluffy machine, and a polypropylene aerogel high resilience batting was obtained.
[0036] Example 2 Example 2 is different from Example 1 only in that in step S1 of Example 2, 0.24 parts by weight of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and 0.21 parts by weight of triallyl isocyanurate are replaced by 0.30 parts by weight of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and 0.15 parts by weight of triallyl isocyanurate.
[0037] Example 3 Example 3 differs from Example 1 only in that in Step S1 of Example 3, 0.24 parts by weight of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and 0.21 parts by weight of triallyl isocyanurate are replaced by 0.15 parts by weight of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester and 0.30 parts by weight of triallyl isocyanurate.
[0038] Example 4 Example 4 differs from Example 1 only in that in Step S1 of Example 4, 4 parts by weight of SEBS-g-MAH is replaced by 4 parts by weight of PP-g-MAH. Comparative Example
[0039] Comparative Example 1 Comparative Example 1 differs from Example 1 only in that in Step S1 of Comparative Example 1, 10 parts by weight of the hydrophobic nano-SiO2 aerogel powder modified by a silane coupling agent prepared in Preparation Example 1 is replaced by 10 parts by weight of the hydrophobic nano-SiO2 aerogel powder. Performance detection test
[0040] The polypropylene aerogel high-resilience batting prepared in each example and comparative example is respectively made into a test sample panel with a specification of 30 cm x 30 mm x 2.5 mm, and the following performance detection is carried out: 1. Heat insulation performance: the heat transfer coefficient of the test sample panel is tested according to the method of GB / T 11048-2018, and the lower the heat transfer coefficient, the better the heat insulation performance; 2. Resilience: the resilience of the test sample panel is tested according to the method of GB / T 6670-2008, and the larger the value, the better the elastic performance of the material; 3. Resilience durability: the compression permanent set of the test sample panel is tested according to the standard of ASTM D395-2006, and the compression permanent set calculation formula is as follows:
[0041] t0 is the initial thickness of the sample; t1 is the thickness of the sample after compression; t2 is the thickness of the spacer. The smaller Cs, the better the resilience of the material and the stronger the deformation resistance.
[0042] 4. Mechanical property test: the elongation at break of the test sample panel is tested according to ASTM D638 to characterize the mechanical properties of the material.
[0043] Table 1, the performance test data of the test sample panels prepared in each example and comparative example Test item Heat transfer coefficient (W / m-K) Rebound resilience (%) Compression set (%) Elongation at break (%) Example 1 0.029 94.2 3.5 332 Example 2 0.031 88.7 6.3 295 Example 3 0.033 87.3 7.8 278 Example 4 0.030 90.5 4.8 298 Comparative Example 1 0.039 81.8 9.6 235 It can be seen from the combination of Example 1 and Examples 2-3, and in combination with Table 1, that the test data of Example 1 is better than that of Examples 2-3, which may be due to the fact that the mass ratio of 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-ylidene]tris-2,1-ethanediol ester to triallyl isocyanurate in Example 1 is within the optimal synergistic range. At this ratio, the thiol groups of the thiol crosslinking agent can quickly initiate preliminary crosslinking to build a uniform elastic network prototype, and triallyl isocyanurate can supplement crosslinking sites through high-density double bonds to form a synergistic effect of rapid network formation and dense reinforcement; at the same time, the thiol groups and the epoxy groups of the silane coupling agent KH-560 undergo high-efficiency ring-opening reaction to realize strong interfacial bonding of the hydrophobic nano-SiO2 aerogel and the polypropylene matrix, thereby ensuring a low heat transfer coefficient.
[0044] It can be seen from the combination of Example 1 and Example 4, and in combination with Table 1, that the test data of Example 1 is better than that of Example 4, which may be due to the fact that the compatibilizer used in Example 1 is SEBS-g-MAH, which contains an ethylene-butene elastic segment in its molecular structure, and the molecular chain structure of the polyolefin elastomer is highly compatible, which can synergistically build a continuous and stable elastic network to significantly improve the material resilience; at the same time, the SEBS-g-MAH has a higher grafting rate of maleic anhydride and a stronger carboxyl activity, which can form more stable ester bonds and hydrogen bonds with the epoxy groups and hydroxyl groups on the surface of the KH-560 modified aerogel, further strengthening the interfacial bonding force between the aerogel and the polypropylene matrix, ensuring uniform dispersion of the aerogel, and thereby realizing synergistic optimization of thermal insulation, resilience and mechanical properties.
[0045] It can be seen from the combination of Example 1 and Comparative Example 1, and in combination with Table 1, that the test data of Example 1 is better than that of Comparative Example 1, which may be due to the fact that the hydrophobic nano-SiO2 aerogel powder modified by KH-560 is used in Example 1, the alkoxysilane groups of KH-560 undergo hydrolysis and condensation reaction with the residual hydroxyl groups on the surface of the aerogel to form Si-O-Si covalent bonds, effectively reducing the surface polarity of the aerogel, and at the same time, the epoxy groups thereof can undergo ring-opening reaction with the carboxyl groups of SEBS-g-MAH and the -SH groups of the thiol crosslinking agent to build a covalent bond bridging system of “aerogel-KH-560-compatibilizer / crosslinking agent-matrix”, thereby completely solving the compatibility problem of the aerogel and the non-polar polypropylene matrix, allowing the aerogel to be uniformly dispersed in the matrix at a nanoscale, the ultra-high specific surface area and porous structure of the aerogel being completely preserved, and air being efficiently intercepted, so that the heat transfer coefficient is low; at the same time, the strong interfacial bonding force avoids interfacial peeling under external force, and in combination with the synergy of the crosslinking network and the elastic network, the material exhibits excellent resilience, resilience durability and mechanical properties.
[0046] The application uses hydrophobic nano-SiO2 aerogel powder modified by KH-560 as a core heat preservation component, 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-substituted]tris-2,1-ethanediol ester and triallyl isocyanurate as a composite crosslinking system, and SEBS-g-MAH as an optimal compatibilizer, and through the synergistic effect of the components and the process, the composite cloud wool material has excellent heat insulation performance, high rebound rate and persistent rebound stability, and outstanding comprehensive core performance of mechanical strength and toughness.
[0047] The embodiment is only an explanation of the application, and is not a limitation of the application, and those skilled in the art can make modifications to the embodiment without creative contribution according to the needs after reading the specification, but as long as the modifications are within the scope of the claims of the application, they are protected by the patent law.
Claims
1. A polypropylene melt aerogel high resilience batting, characterized in that, The components include the following weight parts: polypropylene resin matrix 75-85 parts, hydrophobic nano-SiO2 aerogel powder 8-12 parts, polyolefin elastomer 6-10 parts, compatibilizer 3-5 parts, foaming agent 0.5-0.9 parts, initiator 0.5-1.0 parts, crosslinking agent 0.3-0.6 parts, and antioxidant 0.2-0.3 parts, the surface of the hydrophobic nano-SiO2 aerogel powder is modified by a silane coupling agent, and the crosslinking agent includes 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl]tris-2,1-ethanediol and triallyl isocyanurate.
2. The polypropylene melt aerogel high resilience batting of claim 1, wherein, The mass ratio of the 3-mercaptopropionic acid-[2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-hydrazyl]tris-2,1-ethanediol and triallyl isocyanurate is (1-1.2):
1.
3. The polypropylene melt aerogel high resilience batting of claim 1, wherein, The silane coupling agent is KH-560.
4. The polypropylene melt aerogel high resilience batting of claim 1, wherein, The compatibilizer is selected from one or more of SEBS-g-MAH, PP-g-MAH.
5. The polypropylene melt aerogel high resilience batting of claim 4, wherein, The compatibilizer is SEBS-g-MAH.
6. The polypropylene melt aerogel high resilience batting of claim 1, wherein, The foaming agent is azodicarbonamide.
7. The polypropylene melt aerogel high resilience batting of claim 1 wherein, The initiator is dicumyl peroxide.
8. The polypropylene melt aerogel high resilience batting of claim 1, wherein, The antioxidant includes antioxidant 1010 and antioxidant 168.
9. The polypropylene melt aerogel high resilience batting of claim 8, wherein, The mass ratio of the antioxidant 1010 and the antioxidant 168 is 1:(1-2).
10. A process for the preparation of the polypropylene melt aerogel high resilience batting of any of claims 1-9, characterized in that, The method includes the following steps: S1, polypropylene resin matrix, hydrophobic nano-SiO2 aerogel powder modified by a silane coupling agent, polyolefin elastomer, and compatibilizer are put into a mixer and mixed, foaming agent and initiator are added and uniformly mixed, crosslinking agent is added and uniformly mixed, the temperature is raised to 60-80°C, antioxidant is added and uniformly dispersed, to obtain a mixture; S2, the mixture of step S1 is put into an extruder for melt blending, the melt is extruded through a spinneret, dried and shaped after cooling, to obtain a composite fiber; S3, the composite fiber in step S2 is opened by a mechanical opening machine and then treated by an air flow fluffing machine, to obtain the polypropylene aerogel high-resilience cloud wool.