CN114479444A - Special material for automobile cylinder head cover produced by using regenerated PA66 - Google Patents
Special material for automobile cylinder head cover produced by using regenerated PA66 Download PDFInfo
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- CN114479444A CN114479444A CN202210157300.5A CN202210157300A CN114479444A CN 114479444 A CN114479444 A CN 114479444A CN 202210157300 A CN202210157300 A CN 202210157300A CN 114479444 A CN114479444 A CN 114479444A
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- 239000000463 material Substances 0.000 title claims abstract description 30
- 239000003365 glass fiber Substances 0.000 claims abstract description 27
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 22
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 19
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 18
- 239000007822 coupling agent Substances 0.000 claims abstract description 15
- 239000004677 Nylon Substances 0.000 claims abstract description 14
- 229920001778 nylon Polymers 0.000 claims abstract description 14
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- 239000004970 Chain extender Substances 0.000 claims abstract description 12
- 229920006128 poly(nonamethylene terephthalamide) Polymers 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 230000007062 hydrolysis Effects 0.000 claims abstract description 11
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 11
- 239000012745 toughening agent Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 11
- 229920001577 copolymer Polymers 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 150000001879 copper Chemical class 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
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- 239000011265 semifinished product Substances 0.000 claims description 4
- 150000003568 thioethers Chemical class 0.000 claims description 4
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000012948 isocyanate Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 3
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- 239000003814 drug Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
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- 230000014759 maintenance of location Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000010705 motor oil Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
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- 239000002283 diesel fuel Substances 0.000 description 2
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- 230000003679 aging effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a special material for an automobile cylinder head cover, which is produced by utilizing regenerated PA 66. The traditional Chinese medicine is prepared from the following raw materials in parts by weight: regenerated PA66100 parts, nylon PA9T 15 parts to 60 parts, nylon PA MXD-610 parts to 50 parts, hydrolysis resistant glass fiber 65 parts to 150 parts, toughening agent 0 part to 30 parts, compatilizer 0 part to 20 parts, glass fiber exposure preventing agent 0 part to 7.5 parts, chain extender 3 parts to 10 parts, coupling agent 0.4 part to 2.5 parts, heat stabilizer 0 part to 4 parts, antioxidant 0.4 part to 2 parts, and black color master batch 3 parts to 10 parts. The invention can meet the requirements of the working conditions of the automobile cylinder cover such as heat resistance, printability, high strength, high impact resistance, welding bursting pressure, liquid resistance and the like, widens the field of PA66 recycling, reduces resource waste and environmental pollution, reduces material cost, and can create great economic benefits for enterprises and society.
Description
Technical Field
The invention relates to the technical field of material recycling, in particular to recycling of waste PA 66.
Background
The cylinder head cover is a cover shell covering the engine cylinder body, prevents external impurities from entering the engine, plays a role in sealing, keeps engine oil inside, and simultaneously isolates pollutants such as dirt, moisture and the like; while isolating the oil from the air. Oil mist is formed during operation of the engine. The cooler inner surface of the cylinder head cover can collect oil mist, so that the engine oil is condensed and flows back to the engine oil shell; but also takes over the responsibility of crankcase ventilation. As the piston moves within the cylinder, pressure builds up inside the engine. If left unchecked, this pressure could cause the various seals to leak, resulting in reduced engine efficiency. This requires materials with high strength, high dimensional stability, low warpage, low linear expansion coefficient, excellent liquid resistance, high flying stone impact resistance, good weldability, burst resistance, high heat resistance, excellent long-term thermal aging properties, and printability.
At present, the properties of the regenerated PA66 material, such as strength, heat resistance, liquid resistance, welding performance and dimensional stability, are relatively poor, and especially the high-temperature thermal-oxidative aging performance, the liquid resistance and the dimensional stability cannot meet the working condition requirements of a cylinder head cover. Therefore, no report about the application of the regenerated PA66 in the production of the automobile cylinder head cover is found.
Disclosure of Invention
The invention provides a method for producing a special material for an automobile cylinder head cover by using regenerated PA66, which can overcome the defects of the performance of a regenerated PA66 material, so that the special material for the automobile engine head cover can be produced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the raw materials in percentage by weight are as follows:
regenerated PA66100 shares;
15-60 parts of nylon PA9T 15;
nylon PA MXD-610-50 parts;
65-150 parts of hydrolysis-resistant glass fiber;
0-30 parts of toughening agent;
0-20 parts of a compatilizer;
0-7.5 parts of glass fiber anti-exposure agent;
3-10 parts of a chain extender;
0.4-2.5 parts of coupling agent;
0-4 parts of a heat stabilizer;
0.4 to 2 portions of antioxidant;
3 to 10 parts of black color master batch.
In the above technical solution, a more specific technical solution may also be: the weight parts of the raw materials are as follows:
the composite material comprises, by weight, 100 parts of regenerated PA66100, 9 parts of nylon PA9T 36, 100 parts of nylon PA MXD-615, 100 parts of hydrolysis-resistant glass fiber, 12 parts of toughening agent, 8 parts of compatilizer, 3 parts of glass fiber exposure preventing agent, 3 parts of chain extender, 1.8 parts of heat stabilizer, 0.9 part of antioxidant, 1 part of coupling agent and 5 parts of black color master batch.
Further, the regenerated PA66 is a particle formed by crushing, cleaning and granulating a recovery ribbon, a conveyor belt and a gift cloth.
Further, the relative viscosity of the nylon PA9T is above 2.8;
the hydrolysis-resistant glass fiber is treated by a silane-based impregnating compound, and the diameter of a monofilament is 10-13 microns, and the length of the monofilament is 3-6 mm;
the glass fiber exposure preventing agent is modified ethylene bis fatty acid amide;
the compatilizer is polypropylene grafted maleic anhydride with the grafting rate of more than or equal to 1.2 percent;
the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent;
the heat stabilizer is an inorganic copper salt heat stabilizer, a hindered amine heat stabilizer and a hindered phenol heat stabilizer;
the antioxidant is prepared by compounding a hindered phenol antioxidant and a thioether compound antioxidant in a mass ratio of 2: 1;
the black color master batch is a color master batch containing 50% of carbon black.
Further, the chain extender is one of epoxy copolymer, isocyanate copolymer, amide copolymer and styrene-glycidyl acrylate copolymer;
the toughening agent is POE grafted maleic anhydride with the grafting rate of 1-1.5%.
Further, the method comprises the following preparation steps:
A. mixing regenerated PA66, PA9T, PA MXD-6, a glass fiber exposure preventing agent, a toughening agent, a compatilizer, a heat stabilizer, a chain extender, a coupling agent, an antioxidant and black color masterbatch according to a ratio to obtain a mixture;
B. b, adding the mixture obtained in the step A from the main feed of a double-screw extruder, adding hydrolysis-resistant glass fibers from a feeding port at the 8 th zone side of the double-screw extruder, and performing extrusion plasticizing under the process conditions that the screw temperature of the double-screw extruder is 265-295 ℃, the rotating speed of a main machine screw is 350-450 r/min, and the frequency of the feeding machine is 11-15 Hz to obtain a semi-finished product;
C. and cooling, drying, granulating and homogenizing the obtained semi-finished product.
Furthermore, the double-screw extruder is a co-rotating double-screw extruder with the screw diameter of 65mm and the length-diameter ratio of 52:1 and the double vacuum pressures of-0.06 MPa to 0.08 MPa.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention can meet the requirements of various working conditions (such as heat resistance, printability, high strength, high impact resistance, welding bursting pressure and liquid resistance) of the automobile cylinder cover, widens the field of PA66 recycling, reduces resource waste and environmental pollution, reduces material cost, and can create great economic benefits for enterprises and society.
2. The invention mainly utilizes the recovered and regenerated PA66 to be compounded with PA9T and PA MXD-6 resin, thereby improving the comprehensive performance of the material, particularly the heat resistance is good, and the material can be used for a long time at the temperature of between 40 ℃ below zero and 150 ℃; the liquid resistance is excellent, and the oil can be soaked in liquids such as diesel oil, engine lubricating liquid, engine cooling liquid and the like for a long time without phenomena such as color change, softening, catalysis and the like; the size stability is high, and the size is not changed under the temperature alternation of-40 ℃ to 150 ℃.
3. Compared with other antioxidants and heat stabilizers, the compound prepared by compounding the hindered phenol antioxidant and the thioether compound antioxidant in the mass ratio of 2:1 is used as the antioxidant used by the invention, and the inorganic copper salt heat stabilizer, the hindered amine heat stabilizer and the hindered phenol heat stabilizer are used as the heat stabilizers used by the invention, so that the compound can be normally used at the high temperature of 150 ℃ for a long time.
4. The invention selects the polypropylene grafted maleic anhydride with the grafting rate of more than or equal to 1.2 percent as the compatilizer, thereby improving the comprehensive performance of the material, in particular improving the explosion pressure and the printing performance after welding.
5. According to the invention, by adopting the screw combination matched with the design adjustment, the length integrity of the glass fiber is ensured, the melting and dispersion of each phase are better, and the comprehensive performance of a material system is improved.
6. According to the invention, the regenerated PA66 prepared from the ribbon, the conveyor belt and the gift cloth is selected as the main base material, so that the material cost is reduced, and the product has higher competitiveness.
Drawings
FIG. 1 is a schematic view showing the screw combinations of the extruders used in examples 1 to 3 and comparative examples 1 to 4.
FIG. 2 is a schematic view of a screw combination of an extruder used in comparative example 5.
In the figure, 1 is a conveying section; 2 is a melt plasticizing section; 3 is a mixing section; 4 is an exhaust gas homogenizing section; and 5 is a metering section.
Detailed Description
The present invention is further described in detail below with reference to examples;
the following table 1 shows the compositions of examples 1 to 3 in terms of parts by weight of raw materials, and table 2 shows the compositions of comparative examples 1 to 4 in terms of parts by weight of raw materials.
Wherein the regenerated PA66 mentioned in table 1 and table 2 is: the binding belt, the conveying belt and the gift cloth are crushed, cleaned and granulated to form particles;
nylon PA 9T: poly 1, 9 nonyleneterephthalamide resin, jequiry N1006A;
nylon PA MXD-6: poly m-xylylene adipamide dupont 3426;
hydrolysis-resistant glass fiber: alkali-free short fibers with the diameter of 10-13 microns and the length of 3-6mm are treated by the silane-based wetting agent, and boulder group ECS 10-03-568H;
a compatilizer: polypropylene grafted maleic anhydride (PP-g-MAH), the grafting rate is more than or equal to 1.2 percent, Shenyanke Tong, KT-1;
chain extender: epoxy, basf, ADR-4468;
coupling agent: silane coupling agent KH560, morning light chemical;
thermal oxygen stabilizer: inorganic copper salts, brongman H336;
antioxidant: compounding hindered phenols and thioether compounds, wherein the mixture ratio is 2:1, basf 1010, DSTP;
glass fiber exposure preventing agent: modified ethylene bis fatty acid amide, pont TAF of eastern Aquapoceae;
black color masterbatch: 50% of carbon black, PE carrier, national Cabot company, under the trade name PE 2718;
a toughening agent: grafting rate of 1-1.5% POE grafted maleic anhydride, Shenyangtao KT-10A).
Table 1 gives the raw material compositions of examples 1 to 3, comparative examples 1 to 5 prepared by the following steps:
(1) crushing, cleaning and granulating the recovered PA66 ribbon, conveyor belt and gift cloth by using a single-screw extruder; then the mixture is stirred uniformly by a 20-ton homogenizing bin to obtain regenerated PA 66;
(2) a homodromous double-screw extruder with high torque and double vacuum is used, the diameter of a screw is 65mm, the length-diameter ratio is 52:1, and parts of a screw combination of the extruder, such as a conveying mixing section, a side feeding fiber adding section, a mixing section, a vacuum exhaust section and the like, are adjusted and combined;
(3) putting regenerated PA66, PA9T, PA MXD-6, glass fiber exposure preventing agent, toughening agent, compatilizer, heat stabilizer, chain extender, coupling agent, antioxidant and black color masterbatch into a high-speed mixer according to the proportion, and mixing for 5-10 min;
(4) adding the mixture obtained in the step (3) from the main feed of a double-screw extruder, and adding hydrolysis-resistant glass fibers from a feeding port at the 8 th zone side of the double-screw extruder;
(5) and extruding, cooling, drying, granulating, homogenizing and the like to obtain a finished product.
TABLE 1
TABLE 2
Examples 1 to 3, comparative examples 1 to 4 use an extruder with a screw combination as shown in fig. 1, in which:
conveying section 1: by adopting an SK large-lead thread element, the conveying capacity of the screw is improved, the material retention time is shortened, and the degradation of regenerated PA66 caused by long retention time is reduced;
melting section 2: reducing kneading elements, adjusting angles of the kneading elements, reducing shearing capacity of a screw, and reducing temperature rise and thermal degradation of regenerated PA66 caused by strong shearing capacity and large friction force under the condition of not influencing dispersion of all components of a system; the length of the reverse threaded element is reduced, the back pressure of the material is reduced, the shearing heat is reduced, the material retention time is shortened, and the degradation of the regenerated PA66 caused by long retention time and high shearing heat temperature is reduced;
mixing section 3 and exhaust homogenizing section: the method has the advantages that partial kneading elements are reduced, 32/96 conveying type toothed discs, 176/88LS stretching blocks and C18 toothed discs are added, the shearing efficiency of the glass fibers is improved, the plasticizing efficiency is improved, the dispersing capacity of the glass fibers is improved, and meanwhile, the further decomposition of the regenerated PA66 caused by the temperature in the barrel due to excessive shearing heat is reduced, so that the comprehensive performance of the system is improved.
Comparative example 5 used the same raw material composition and ratio as in example 3, except that comparative example 5 used an extruder with a screw combination as shown in fig. 2.
Table 3 shows the performance parameters of the products obtained in examples 1 to 3, and Table 4 shows the performance parameters of the products obtained in comparative examples 1 to 5.
The performance detection method comprises the following steps:
the granules prepared according to the above proportion are dried for 6 hours at 145 ℃, and then the following performance tests are carried out:
1. the cantilever beam notch impact strength is carried out according to GB/T1843-2008 standard, the sample size is 80 multiplied by 10 multiplied by 4mm, and the A-shaped notch is formed;
2. the heat distortion temperature test is carried out according to the GB/T1634.2-2019 standard, the sample size is 80 multiplied by 10 multiplied by 4mm, the load is 1.82MPa, and the sample is horizontally placed;
3. the tensile property test is carried out according to the GB/T1040.2-2018 standard, the sample size is 150 multiplied by 10 multiplied by 4mm, and the tensile speed is 50 mm/min;
4. the bending performance test is carried out according to the GB/T9341-2008 standard, the size of a sample is 80 multiplied by 10 multiplied by 4mm, the bending speed is 2mm/min, and the span is 64 mm;
5. and (4) blasting pressure, wherein the sample is a finished workpiece, the cavity is sealed, gas is introduced into the cavity until blasting, and the pressure of a blasting point is tested.
6. The ink adhesion is carried out according to the GB/T9286-1998 standard;
7. the linear expansion coefficient test is carried out according to the GB/T2572-;
8. the cold and hot alternation test is carried out according to QC/T15-92 standard, and the test requirements are as follows: keeping the humidity of 60% for 2 hours at room temperature; heating to 80 ℃ within 1 hour, and keeping the humidity at 90% for 3 hours; heating to 150 deg.C within 1 hr, and maintaining for 2 hr; then cooling to-40 ℃ within 1 hour, and keeping for 1 hour; heating to room temperature within 1 hour for one cycle, and testing for 24 cycles;
9. the thermal oxidation aging performance test is carried out according to the GB/T7141-2008 standard, and the test condition is 150 ℃ multiplied by 1000 h;
10. the liquid resistance (diesel oil, engine lubricating liquid and engine cooling liquid) is carried out according to the GB/T11547-2008 standard, and the test condition is 150 ℃ multiplied by 168 h.
TABLE 3
TABLE 4
According to the examples and the comparative examples, the optimal dosage of the regenerated PA66 is 35%, PA with proper special performance and proper amount of functional additives (heat stabilizer, chain extender, compatilizer and the like) need to be added, and the glass fiber reinforced PA66 material meeting the working condition requirements of the automobile cylinder head cover can be prepared by matching with proper screw combination. Because the belt, the conveyor belt and the gift cloth regenerated PA66 are used for processing for a plurality of times, and even more, the parts of the belt, the conveyor belt and the gift cloth regenerated PA66 are decomposed, and the viscosity and the performance are greatly reduced. If the regenerated PA66 is not modified by the means, the pure glass fiber reinforced regenerated PA66 material cannot meet the working condition requirement of the automobile cylinder head cover.
Claims (7)
1. A special material for an automobile cylinder head cover produced by using regenerated PA66 is characterized by being prepared from the following raw materials in parts by weight:
regenerated PA66100 shares;
15-60 parts of nylon PA9T 15;
nylon PA MXD-610-50 parts;
65-150 parts of hydrolysis-resistant glass fiber;
0-30 parts of toughening agent;
0-20 parts of a compatilizer;
0-7.5 parts of glass fiber anti-exposure agent;
3-10 parts of a chain extender;
0.4-2.5 parts of coupling agent;
0-4 parts of a heat stabilizer;
0.4 to 2 portions of antioxidant;
3 to 10 parts of black color master batch.
2. The special material for the automobile cylinder head cover produced by using the regenerated PA66 as claimed in claim 1, wherein the parts by weight of the raw materials are as follows:
the composite material comprises, by weight, 100 parts of regenerated PA66100, 9 parts of nylon PA9T 36, 100 parts of nylon PA MXD-615, 100 parts of hydrolysis-resistant glass fiber, 12 parts of toughening agent, 8 parts of compatilizer, 3 parts of glass fiber exposure preventing agent, 3 parts of chain extender, 1.8 parts of heat stabilizer, 0.9 part of antioxidant, 1 part of coupling agent and 5 parts of black color master batch.
3. The material for automobile cylinder head cover special use produced by using regenerated PA66 as claimed in claim 1 or 2, wherein: the regenerated PA66 is a particle formed by crushing, cleaning and granulating a recovery binding belt, a conveying belt and a gift cloth.
4. The material for automobile cylinder head covers produced by using the regenerated PA66 as claimed in claim 3, wherein:
the relative viscosity of the nylon PA9T is above 2.8;
the hydrolysis-resistant glass fiber is treated by a silane-based impregnating compound, and the diameter of a monofilament is 10-13 microns, and the length of the monofilament is 3-6 mm;
the glass fiber exposure preventing agent is modified ethylene bis fatty acid amide;
the compatilizer is polypropylene grafted maleic anhydride with the grafting rate of more than or equal to 1.2 percent;
the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent;
the heat stabilizer is an inorganic copper salt heat stabilizer, a hindered amine heat stabilizer and a hindered phenol heat stabilizer;
the antioxidant is prepared by compounding a hindered phenol antioxidant and a thioether compound antioxidant in a mass ratio of 2: 1;
the black color master batch is a color master batch containing 50% of carbon black.
5. The material for automobile cylinder head covers produced by using the regenerated PA66 as claimed in claim 4, wherein:
the chain extender is one of epoxy copolymer, isocyanate copolymer, amide copolymer and styrene-glycidyl acrylate copolymer;
the toughening agent is POE grafted maleic anhydride with the grafting rate of 1-1.5%.
6. The material for the cylinder head cover special for the automobile, which is produced by utilizing the regenerated PA66, according to claim 5, is characterized by comprising the following preparation steps:
A. mixing regenerated PA66, PA9T, PA MXD-6, a glass fiber exposure preventing agent, a toughening agent, a compatilizer, a heat stabilizer, a chain extender, a coupling agent, an antioxidant and black color masterbatch according to a ratio to obtain a mixture;
B. b, adding the mixture obtained in the step A from the main feed of a double-screw extruder, adding hydrolysis-resistant glass fibers from a feeding port at the 8 th zone side of the double-screw extruder, and performing extrusion plasticizing under the process conditions that the screw temperature of the double-screw extruder is 265-295 ℃, the rotating speed of a main machine screw is 350-450 r/min, and the frequency of the feeding machine is 11-15 Hz to obtain a semi-finished product;
C. and cooling, drying, granulating and homogenizing the obtained semi-finished product.
7. The material for automobile cylinder head covers produced by using the regenerated PA66 as claimed in claim 6, wherein the material comprises the following components in percentage by weight:
the double-screw extruder is a co-rotating double-screw extruder with screw diameter of 65mm and length-diameter ratio of 52:1 and double vacuum pressures of-0.06 MPa to 0.08 MPa.
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| CN114479444B (en) | 2024-03-26 |
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