CN116199977A - Low-surface-defect long glass fiber reinforced polypropylene composite material for automotive interior and preparation method thereof - Google Patents
Low-surface-defect long glass fiber reinforced polypropylene composite material for automotive interior and preparation method thereof Download PDFInfo
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- CN116199977A CN116199977A CN202211705430.4A CN202211705430A CN116199977A CN 116199977 A CN116199977 A CN 116199977A CN 202211705430 A CN202211705430 A CN 202211705430A CN 116199977 A CN116199977 A CN 116199977A
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- 239000003365 glass fiber Substances 0.000 title claims abstract description 93
- -1 polypropylene Polymers 0.000 title claims abstract description 54
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 53
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 55
- 230000007547 defect Effects 0.000 claims abstract description 30
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 5
- 229920005989 resin Polymers 0.000 claims abstract description 5
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- 238000005470 impregnation Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 206010051246 Photodermatosis Diseases 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 239000005083 Zinc sulfide Substances 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 150000008064 anhydrides Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 230000002776 aggregation Effects 0.000 abstract description 6
- 238000005054 agglomeration Methods 0.000 abstract description 5
- 238000007667 floating Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 2
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- 238000009434 installation Methods 0.000 abstract description 2
- 238000005034 decoration Methods 0.000 abstract 1
- 238000001746 injection moulding Methods 0.000 description 9
- 230000009467 reduction Effects 0.000 description 6
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- 230000000052 comparative effect Effects 0.000 description 5
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- 239000011248 coating agent Substances 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
- C08J5/08—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/14—Copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
Abstract
The invention discloses a low-surface defect long glass fiber reinforced polypropylene composite material for interior decoration and a preparation method thereof, wherein the formula of the low-surface defect long glass fiber reinforced polypropylene composite material is prepared from the following components in parts by weight: 65-75 parts of high-melt-index copolymerized polypropylene resin, 20-30 parts of high-modulus alkali-free glass fiber, 3-5 parts of glass fiber impregnating aid, 3-5 parts of silane coupling agent, 1-1.5 parts of toner and 1-3 parts of anti-aging agent. The low-surface defect long glass fiber reinforced polypropylene prepared by the invention has the advantages that the material mechanical property is greatly improved, the injection defect problem which is easy to generate for a long time in the application process of the long glass fiber reinforced polypropylene is solved, and the surface floating fiber and agglomeration problems are greatly reduced through optimizing the formula of the product and designing the production process. On the basis of meeting the material requirements of automobile manufacturers, the automobile body interior trim production and installation steps are reduced, the carbon emission of the manufacturers is reduced, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of polypropylene materials, in particular to a low-surface-defect long glass fiber reinforced polypropylene composite material for automotive interiors and a preparation method thereof. The material is suitable for manufacturing automobile instrument boards, inner decorative peripheral parts such as upright posts and the like.
Technical Field
In recent years, with the continuous promotion of policies and the common driving of multiple factors such as technology, market and the like, the market output of new energy automobiles in China is in a rapidly growing situation. On the one hand, the private demands of new energy sources in non-limited purchasing areas are gradually increased, and the market penetration rate is rapidly increased. On the other hand, the technology of the new energy automobile is iterated continuously, pain points such as cruising, intellectualization and the like are improved gradually, and the technology is favorable for the development of the new energy automobile. However, along with the rapid development of new energy industries, how to reduce carbon emissions at the production end is also a problem that enterprises must face. The automobile material is a key field for reducing carbon emission of the whole automobile, plastic is used for replacing steel, the weight of the whole automobile is reduced, and the directions of reducing production flow and the like are all directions of enterprise attack. The fiber reinforced plastic is a composite material which combines the advantages of high strength, low weight, strong plasticity and the like, and has great advantages in the current large environment of carbon reduction production. However, the traditional long fiber material is only often applied to support parts in the whole vehicle production process, mainly because the material often has a large range of surface defects after injection molding, and if the material is applied to interior parts, the defects are covered by means of surface coating and the like, and the process involves a plurality of links such as plasma treatment, glue, leather surface adaptation and the like, so that the production cost reduction and carbon emission reduction of whole vehicle enterprises are not facilitated.
The bonding interface between glass fiber and base polypropylene in the long fiber reinforced material is particularly important, on the one hand, the performance of the reinforced material is improved by the destructive energy of the bonding interface, and on the other hand, the common surface defects of the long fiber reinforced material such as floating fiber and agglomeration are also caused by the interfacial bonding capability of the two main materials in the injection molding process, when the interfacial bonding force is insufficient, the glass fiber and the base polypropylene are separated and flow in the injection molding process to form a certain fountain effect, so that part of glass fiber is gathered at a certain point or cooled before the base reaches the surface of a mold, and thus the surface defects are caused. From this point of view, how to improve the bonding capability of the polypropylene interface and the glass fiber interface in the finished material is the key to improve the material performance and expand the application field of the material.
In the production process of the low-surface-defect long glass fiber reinforced polypropylene composite material for the automotive interior, the invention innovates both the product formula and the production process from the production requirement of enterprises. From the aspect of product formulation, the traditional simple mode of simply combining long glass fiber, polypropylene and compatilizer is changed. By means of nanoscale SiO 2 The characteristic of large specific surface area is that the glass fiber is loaded on the surface of the traditional glass fiber to improve the glass fiber impregnation performance, so that the combination specific surface area of the glass fiber and the base material polypropylene is greatly improved, and the non-smooth surface of the loaded glass fiber is also conducive to physical engagement with the base material. Adopts dispersed nano SiO 2 As the glass fiber surface solubilizer, a good reaction space is provided for the combination of the base materials, and the interface combination capacity of the material is greatly enhanced. Innovating from the production steps, firstly preparing glass fiber impregnating aid, then heating and impregnating the glass fiber, and then carrying out impregnating traction, so that the long glass fiber entering an impregnating mould box can quickly reach the interface bonding equilibrium temperature with the base material, and the impregnating time is shortened. The reinforced material produced in this way has strong interfacial binding force and extremely high mechanical property, and meanwhile, the probability of surface defects in the subsequent injection molding process is greatly reduced. The subsequent application can be directly injection molded in the automobile interior part, and the links such as glue coating and the like are not needed for surface modification. For the whole car manufacturing enterprises, the production links are reduced, the production cost and the carbon emission level are effectively reduced, and the profit improvement is facilitated.
Disclosure of Invention
The invention aims to solve the technical problem that the existing long glass fiber reinforced polypropylene material has excessive surface defects. The low-surface-defect long glass fiber reinforced polypropylene composite material for the automotive interior is provided with:
in order to solve the technical problems, the invention adopts the following technical scheme:
the long glass fiber reinforced polypropylene composite material with low surface defects for the automotive interior comprises the following components in parts by weight:
wherein, the liquid crystal display device comprises a liquid crystal display device,
the base material polypropylene is high melt index copolymerized polypropylene, and the MFR is more than or equal to 65.
The high-modulus alkali-free glass fiber comprises: the diameter of the monofilaments is 15-17 mu m.
The glass fiber auxiliary impregnant is as follows: modified high-dispersion nano SiO 2 An absolute ethanol solution comprising nanoscale SiO 2 One or a mixture of a plurality of silane coupling agents KH550, KH570 and maleic anhydride grafts.
The anti-aging agent is a mixture of an antioxidant and an anti-photo-aging auxiliary agent, wherein the antioxidant is a mixture of at least two or more of general 3114, 168, 618, 619F,1010, 1035 and DSTP, and the selected anti-photo-aging auxiliary agent is one or more of ultraviolet absorber UV5590 and UV 5529.
The toner is one or more of carbon black, titanium dioxide and zinc sulfide.
The preparation method of the low-surface-defect long glass fiber reinforced polypropylene composite material for the automotive interior comprises the following steps:
(1) Preparation of glass fiber impregnating aid: to reduce nano SiO 2 The surface energy makes the nano-scale evenly dispersed, the material is immersed into KH550 solution for 4 hours, and then the obtained product is added with absolute ethyl alcohol to prepare nano-SiO with 5 percent of content 2 The solution was stirred ultrasonically for a total of 1h at 1500 r/min. The obtained suspension is the glass fiber impregnating aid.
(2) Polypropylene, partial compatilizer, anti-aging agent and toner are mixed and stirred at a high speed according to a certain proportion.
(3) And (3) uniformly mixing the materials in the step (2), then, feeding the materials into a double-screw extruder, and feeding the materials into a melt impregnation die head, wherein the processing temperature is 200-250 ℃, and the rotating speed of a main machine is 300-500rpm. A vacuum pumping system is added in the extrusion process.
(4) The continuous long glass fiber is preheated and dried for 2-4 hours to make the temperature of the continuous long glass fiber be 50-60 ℃, and the glass fiber is pre-dispersed through a tension frame. Then immersing into a glass fiber impregnant-assisting treatment tank for heating and ultrasonic treatment for 30min.
(5) And respectively leading out the treated multi-strand untwisted long glass fiber yarns from the bobbins, and leading the yarns into a melting impregnation die box. The untwisted fiber is coated and impregnated by a melt of melt modified polypropylene resin, the processing temperature is 250-280 ℃, the glass fiber pulling speed is 15-20m/min, the pulling and extruding process is adopted to uniformly coat the pulled multi-strand long glass fiber yarn, and then the long glass fiber reinforced polypropylene granules with the length of 10-15mm are prepared by cooling in a water tank and granulating by a granulator, wherein the weight content of the fiber is 20-30%.
The low-surface-defect long glass fiber reinforced polypropylene prepared by the invention adopts a step-by-step method to prepare a long fiber reinforced polypropylene material through optimizing the formula of the product and designing the production process: 1 preparation of highly dispersed nano SiO in advance 2 The glass fiber impregnating aid is prepared by carrying out impregnating-aid pre-modification on long glass fibers and 3 carrying out impregnating production on glass fiber reinforced materials. The mechanical property of the material is greatly improved, the injection molding defect problem which is easy to generate for a long time in the application process of the long glass fiber reinforced polypropylene is overcome, and the surface floating fiber and agglomeration problems are greatly reduced. On the basis of meeting the material requirements of automobile manufacturers, the automobile body interior trim production and installation steps are reduced, the carbon emission of the manufacturers is reduced, and the production cost is reduced.
Detailed Description
The following examples are presented to further illustrate the invention in connection with the practice thereof, but are not intended to limit the invention in any manner.
The compositions and mass percentages of the components contained in the comparative examples and examples of the present invention are shown in Table 1 below
Table I, the formulation contents of examples and comparative examples are reported by weight
The preparation steps were according to the table above for examples 1,2,3, 4:
(1) Preparation of glass fiber impregnating aid: to reduce nano SiO 2 The surface energy makes the nano-scaleDispersing, soaking the materials in KH550 solution for 4 hr, and adding absolute ethanol to obtain nanometer SiO with 5% content 2 The solution was stirred ultrasonically for a total of 1h at 1500 r/min. The obtained suspension is the glass fiber impregnating aid.
(2) Polypropylene, partial compatilizer, anti-aging agent and toner are mixed and stirred at a high speed according to a certain proportion.
(3) And (3) uniformly mixing the materials in the step (2), then, feeding the materials into a double-screw extruder, and feeding the materials into a melt impregnation die head, wherein the processing temperature is 200-250 ℃, and the rotating speed of a main machine is 300-500rpm. A vacuum pumping system is added in the extrusion process.
(4) The continuous long glass fiber is preheated and dried for 2-4 hours to make the temperature of the continuous long glass fiber be 50-60 ℃, and the glass fiber is pre-dispersed through a tension frame. Then immersing into a glass fiber impregnant-assisting treatment tank for heating and ultrasonic treatment for 30min.
(5) And respectively leading out the treated multi-strand untwisted long glass fiber yarns from the bobbins, and leading the yarns into a melting impregnation die box. The untwisted fiber is coated and impregnated by a melt of melt modified polypropylene resin, the processing temperature is 250-280 ℃, the glass fiber pulling speed is 15-20m/min, the pulling and extruding process is adopted to uniformly coat the pulled multi-strand long glass fiber yarn, and then the long glass fiber reinforced polypropylene granules with the length of 10-15mm are prepared by cooling in a water tank and granulating by a granulator, wherein the weight content of the fiber is 20-30%
The preparation of comparative examples 1,2 is according to table 1:
(1) Polypropylene, compatilizer, anti-aging agent and toner are mixed and stirred at a high speed according to a certain proportion.
(2) And (3) uniformly mixing the materials in the step (1), then, feeding the materials into a double-screw extruder, and feeding the materials into a melt impregnation die head, wherein the processing temperature is 200-250 ℃, and the rotating speed of a main machine is 300-500rpm. A vacuum pumping system is added in the extrusion process.
(3) And preheating and drying the continuous long glass fiber for 2-4 hours, and pre-dispersing the glass fiber through a tension frame.
(4) And respectively leading out the treated multi-strand untwisted long glass fiber yarns from the bobbins, and leading the yarns into a melting impregnation die box. The untwisted fiber is coated and impregnated by a melt of melt modified polypropylene resin, the processing temperature is 250-280 ℃, the glass fiber pulling speed is 15-20m/min, the pulling and extruding process is adopted to uniformly coat the pulled multi-strand long glass fiber yarn, and then the long glass fiber reinforced polypropylene granules with the length of 10-15mm are prepared by cooling in a water tank and granulating by a granulator, wherein the weight content of the fiber is 20-30%
Table 2 results of performance tests for examples and comparative examples
The host factory standard selected was Jili automobile QJLY J7111001A by comparison with the automobile host factory material requirement standard. The table shows that after the glass fiber impregnating aid is treated, the mechanical property of the material is improved by about 10% compared with the conventional same-grade product, and meanwhile, the mechanical property of the material is obviously improved along with the improvement of the content of the impregnating aid, which indicates that the bonding area of the polypropylene and the glass fiber as the base material of the material is obviously increased. When the weight ratio of the auxiliary impregnant is higher than 5%, the mechanical property of the material is obviously reduced because of nano SiO 2 The surface of the glass fiber is occupied excessively, and the continuous bonding interface of the glass fiber and the polypropylene material is damaged, so that the mechanical property of the material is lost.
And carrying out statistics on large-surface-area judgment results by adopting an injection molding template aiming at the surface defects of the material after injection molding. For the present invention, injection molding of 200mm by 100mm by 3mm template 20 pieces was used, totaling a surface area of 40000mm 2 And carrying out surface defect statistics, wherein the defect result that glass fiber aggregation is more than or equal to 2mm is as follows.
Table 3 surface defect statistics for examples and comparative examples
According to the results in Table 3, the glass fiber is fully impregnated and the base polypropylene forms a strong interface effect after the long fiber reinforced material is treated by the impregnating aid, and the agglomeration problem after injection molding is about 18-50% of that of the conventional material. Meanwhile, the defect level is obviously reduced along with the increase of the dosage of the impregnating aid. When the impregnant content is too high, the agglomeration probability of the material is obviously increased due to the reduction of the glass fiber and polypropylene interface.
By nano SiO 2 The impregnated long fiber reinforced material is improved, the mechanical property is obviously improved, the weight reduction design of the interior trim parts of the whole vehicle enterprise is facilitated, meanwhile, the surface defect level is greatly reduced, the subsequent processing steps can be effectively reduced, and the assistance is provided for production cost reduction, energy conservation and emission reduction. The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. The utility model provides a long glass fiber reinforced polypropylene composite material of low surface defect for automotive interior which characterized in that: the adhesive comprises the following components in parts by weight:
2. the low surface defect long glass fiber reinforced polypropylene composite for automotive interiors according to claim 1, wherein the low surface defect long glass fiber reinforced polypropylene composite is characterized in that: the base material polypropylene is high melt index copolymerized polypropylene, and the MFR is more than or equal to 65.
3. The low surface defect long glass fiber reinforced polypropylene composite for automotive interiors according to claim 1, wherein the low surface defect long glass fiber reinforced polypropylene composite is characterized in that: the high-modulus alkali-free glass fiber comprises: the diameter of the monofilaments is 15-17 mu m.
4. The low surface defect long glass fiber reinforced polypropylene composite for automotive interiors according to claim 1, wherein the low surface defect long glass fiber reinforced polypropylene composite is characterized in that: the glass fiber auxiliary impregnant is as follows: modified high-dispersion nano SiO 2 An absolute ethanol solution comprising nanoscale SiO 2 Silane coupling agents KH550, KH570, maleic acidOne or a mixture of several anhydride grafts.
5. The low surface defect long glass fiber reinforced polypropylene composite for automotive interiors according to claim 1, wherein the low surface defect long glass fiber reinforced polypropylene composite is characterized in that: the anti-aging agent is a mixture of an antioxidant and an anti-photo-aging auxiliary agent, wherein the antioxidant is a mixture of at least two or more of general 3114, 168, 618, 619F,1010, 1035 and DSTP, and the selected anti-photo-aging auxiliary agent is one or more of ultraviolet absorber UV5590 and UV 5529.
6. The low surface defect long glass fiber reinforced polypropylene composite for automotive interiors according to claim 1, wherein the low surface defect long glass fiber reinforced polypropylene composite is characterized in that: the toner is one or more of carbon black, titanium dioxide and zinc sulfide.
7. The method for preparing the low surface defect long glass fiber reinforced polypropylene composite material for automotive interiors according to any one of claims 1 to 6, comprising the following steps:
(1) Preparation of glass fiber impregnating aid: to reduce nano SiO 2 The surface energy makes the nano-scale evenly dispersed, the material is immersed into KH550 solution for 4 hours, and then the obtained product is added with absolute ethyl alcohol to prepare nano-SiO with 5 percent of content 2 The solution was stirred ultrasonically for a total of 1h at 1500 r/min. The obtained suspension is glass fiber impregnating aid;
(2) Mixing polypropylene, partial compatilizer, anti-aging agent and toner in proportion at high speed;
(3) Uniformly mixing the materials in the step (2), then, feeding the materials into a double-screw extruder, and feeding the materials into a melt impregnation die head, wherein the processing temperature is 200-250 ℃, and the rotating speed of a main machine is 300-500rpm; adding a vacuum pumping system in the extrusion process;
(4) The continuous long glass fiber is preheated and dried for 2-4 hours to make the temperature of the continuous long glass fiber be 50-60 ℃, and the glass fiber is pre-dispersed through a tension frame. Then immersing the glass fiber into a glass fiber impregnating aid treatment tank for heating and ultrasonic treatment for 30min;
(5) And respectively leading out the treated multi-strand untwisted long glass fiber yarns from the bobbins, and leading the yarns into a melting impregnation die box. The untwisted fiber is coated and impregnated by a melt of melt modified polypropylene resin, the processing temperature is 250-280 ℃, the glass fiber pulling speed is 15-20m/min, the pulling and extruding process is adopted to uniformly coat the pulled multi-strand long glass fiber yarn, and then the long glass fiber reinforced polypropylene granules with the length of 10-15mm are prepared by cooling in a water tank and granulating by a granulator, wherein the weight content of the fiber is 20-30%.
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| CN114426732A (en) * | 2020-10-29 | 2022-05-03 | 中国石油化工股份有限公司 | Modified long glass fiber reinforced polypropylene composite material and preparation method and application thereof |
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