CN110408200A - A kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable and preparation method thereof - Google Patents
A kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable and preparation method thereof Download PDFInfo
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Abstract
The invention discloses the UL94-5VA of a kind of high durable grade flame retardancy reinforced polyamide composite materials and preparation method thereof, it is specifically made of the raw material of following parts by weight: 30-70 parts of polyamide, 10-30 parts of fire retardant, 3-10 parts of compatilizer, amphipathic ionic surfactant 2-8 parts, 5-20 parts of carbon fiber of surface modification, the modified carbon fiber in the surface are the carbon fiber of acrylate prepolymer body processing；Present invention has an advantage that it is directed to the strong absorptive of polyamide material, and with the modifies carbon fiber collective effect of a small amount of, efficient amphipathic ionic surfactant and surface pre-polymerization, effective cured flame-retardant agent molecule while reducing polyamide water absorption rate.The high-performance refractory reinforced polyamide material obtained through the invention can keep good state of appearance under 80 DEG C, the harsh hygrothermal environment of 95%RH and 1500h long period test, it is non-migratory, whiten, the surfaces bad phenomenon such as spot, and every mechanical property conservation rate and flame retardant property also have different degrees of improvement.
Description
Technical field
The invention belongs to technical field of polymer materials, and in particular to a kind of fire-retardant enhancing of the UL94-5VA grade of high durable is poly-
Amide composite material and preparation method.
Background technique
Polyamide (PA, also known as nylon) is noteworthy characterized by its polymer molecular chain containing a large amount of highly polar amide
Group can form stronger Hyarogen-bonding between strand.On the one hand, this stronger intermolecular force can be substantially
Mechanical property such as tensile strength, bending strength, impact strength and the heat resistance of degree improvement polymeric matrix material, and another party
Face, due to hydrone and polar substances, for polyamide material in high humidity environment, amide group also can be with moisture
Son interaction, is greatly lowered so as to cause the inflexible target of material, by taking conventional 15% fiberglass reinforced PA, 6 material as an example,
Stretching, bending strength are respectively 110MPa, 150MPa under its dry conditions, and stretching, bending strength only exist under its hygrometric state condition
60MPa, 80MPa reduce amplitude 50% or so.And for fire-retarding reinforced polyamide, the influence of moisture is just more
It is significant.Since flame retardant molecule is usually all polar compound, there is certain solubility in moisture, therefore, long-term
High temperature, be easy in high humidity environment that surface migration phenomenon of the flame retardant molecule to composite material occurs, not only make material
Flame retardant property reduces, and is easy to happen and whitens, turns to be yellow, the bad phenomenons such as spot.
Currently, since the driving force of automotive field is gradually changed into electrification from fuel oil, for the safety for improving electric car
Property and reliability, the cell packet module in main core component " three electric systems " are commonly designed in the bottom of passenger compartment,
Therefore, material needs high flame-retardancy requirements, and on the other hand, since battery pack system is chronically at complicated ground environment
Middle work, with greater need for the stability of excellent stability, especially flame retardant property.In current existing technical solution,
The flame retardancy reinforced polyamide composite material of a kind of high fire-retardance, low water absorption is provided in CN106519665, but such characteristic is very
High-performance special substrate-the PA10T/11 used in it is depended in big degree, therefore, the scope of application of technical solution have compared with
Big limitation.Hydrothermal stability polyamide compoiste material described in CN109181291 is by being added a certain amount of special type
Function additive improves the stability of color, and to mechanical property and fire-retardant stability is rare reaches.And CN109679335 is then
Flame retardant molecule easy to migrate, being precipitated and small molecule auxiliary agent are subject to using auxiliary addition agent-sheet nano montmorillonite
It is fixed, realize the effect that low surface is precipitated, but the dispersion situation processed in melting mixing of nano montmorillonite actually and is paid no attention to
Think, but depend critically upon the optimization of process equipment and technique, it is difficult to stablize and realize.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of fire-retardant enhancings of the UL94-5VA of high durable grade
Polyamide compoiste material.For, because of strong absorptive caused by polar amide groups, and thus being led in conventional polyamide material
On the one hand the problems such as mechanics and other bad performances in high temperature, high humidity environment caused, it is living to use amphipathic ion
Property agent, with amide group formed saturation hydrogen bond action, reduce itself water imbibition of polyamide material；On the other hand, pass through table
Face pre-polymerization modifies carbon fiber and compatilizer, can effectively be solidified the macromolecular of fire retardant, be reduced by moisture shadow
The surface migration phenomenon rung and generated.
The purpose of the present invention is achieved through the following technical solutions:
A kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable, the raw material including following parts by weight:
Wherein, the modified carbon fiber in the surface is the basalt fibre of acrylate prepolymer body surface activation process.
The modified carbon fiber in the surface the preparation method comprises the following steps: carbon fiber soaks in 60 DEG C, the alkaline solution of 30% concentration
Bubble 30 minutes, sufficiently to remove the inorganic oxide and other impurities of fiber surface.By aqueous epoxy acrylate after filtering out
Prepolymer solution is uniformly sprayed at carbon fiber surface, is then placed in 90 DEG C of vacuum oven, is evacuated to 0.05-0.01MPa.
After the moisture of carbon fiber surface is removed, temperature is risen to 130 DEG C, is heated 2-4 hours, it is sufficiently solid to acrylate prepolymer body
Change and obtains the modified carbon fiber in surface after fiber surface.
Further, the polyamide is in PA6, PA66, PA46, PA610, PA1010, PA612, PA1212
One or more of mixtures.
Further, the fire retardant is the nothings such as brominated Polystyrene, red phosphorus, melamine MCA, organic hypophosphites
One or more of machine or organic compound.
Further, the compatilizer is glycidyl methacrylate graft ethylene-ethyl acetate copolymer
EVA-GMA。
Further, the amphipathic ionic surfactant is higher fatty acid salt, alkylsulfonate, quaternary ammonium salt, phosphide
One or more of class compound etc..
Further, chopped felt of the carbon fiber for continuous carbon fibre roving, fibre diameter 7-13um,
Chopped length is 4.5-8mm.
The second object of the present invention is to provide a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable
Preparation method, the method the following steps are included:
(1) polyamide, fire retardant, compatilizer, ionic surfactant are weighed by the parts by weight, is uniformly mixed, obtains
To mixed raw material:
(2) mixed raw material after drying is placed in the main feeding for the double screw extruder that one tightly engages rotating Vortex
In storehouse, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed of extruder screw
In feed bin, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is
44, the setting of each zone temperature that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C,
240 DEG C, 230 DEG C, engine speed are 250 revs/min, and the height is obtained after the processes such as melting extrusion, granulation, drying process
Weather-proof UL94-5VA grade flame retardancy reinforced polyamide composite material.
Compared with prior art, the invention has the following beneficial effects:
1, saturability and direction firstly, from the fundamental characteristics of polyamide, using this intermolecular force of hydrogen bond
Property, a small amount of, efficient ionic activating agent is added, forms more saturation, stable hydrogen in the useful space of polyamide molecule chain
Key effect, to improve in long-term hygrothermal environment in polyamide material because water diffusion bring reduced performance pair is made
With fundamentally improving the stability of material.
2, further, using high performance surface active carbon fiber reinforcement, the acrylic acid of the modified importing in surface
Ester performed polymer layer can form more good alternate bonding with compatilizer and polyamide substrate, effectively reduce hole in boundary layer,
The Poor structures such as cavity, meanwhile, acrylate surface layer can also play the role of cured flame-retardant agent molecule, improve it in damp and hot ring
The resistance to surface migration in border.
3, the flame retardancy reinforced polyamide composite material that technical solution obtains through the invention not only has good conventional force
Learn performance and flame retardancy performance, and after 80 DEG C, the harsh burn-in test of 95%RH, 1500H, flame retardant rating still can
UL94-5VA is remained, self-extinguishing without fire is fast, post combustion surface is not perforated；Meanwhile the fire-retardant reinforcing material of contrast test is damp and hot
Mechanical performance index also has different degrees of improvement, especially tensile strength and impact strength, aged properties after aging
Conservation rate shows that the resulting high-performance polyamide compoiste material of this programme has good microstructure, especially all 90% or more
It is suitable for the power battery module system of new-energy automobile and some industrial high pressures for having outdoor weathe resistance specific demand,
The fields such as shell, bracket and the functor of Low-voltage Electronic electric appliance.
Specific embodiment
Below by specific embodiment, the present invention is described further, and the embodiment is merely to illustrate this hair
It is bright rather than limiting the invention.
The embodiment of the present invention is raw materials used:
Polyamide: PA6-YH800, middle petrochemical industry Ba Ling chemical fibre Co., Ltd, Ubbelohde viscometer test relative viscosity 2.7.
Fire retardant -1: red phosphor masterbatch 10170, microencapsulation processing, effective red phosphorus content are 70%, and Nantong meaning specialization work has
Limit company.
Fire retardant -2: melamine cyanurate MCA-15, off-white powder, average grain diameter 1.1-1.4um, Sichuan are fine
Chemical Engineering Design research institute.
Fire retardant -3: organic hypo-aluminum orthophosphate OP1314, density 1.5g/cm3, available phosphorus content 20.5~21.5%, Germany
Klein company.
Compatilizer: glycidyl methacrylate graft ethylene-ethyl acetate copolymer EVA-GMA, self-control, chemistry drop
Determining method test grafting rate is 0.85%, by double screw extruder, causes GMA/ styrene St mixing by peroxide initiator
Object is grafted molten state EVA block copolymer and obtains.
Carbon fiber: PAN base chopped carbon fiber, LS-CF5-S, chopped length 5mm, fibre diameter 7um, carbon content >=93%,
The large composite material of Shanghai power.
Ionic surfactant -1: sodium p-octadecyl toluene sulfonate, molecular weight 356.5, bass spy's reagent.
Ionic surfactant -2: alkylamine polyoxyethylene based quaternary ammonium salt, Shandong new promise science and technology Chemical Co., Ltd..
Properties of product test:
Tensile property: it by the batten size of ISO527-2 defined, is tested after being molded standard batten, test rate is
5mm/min is tested under room temperature (23 DEG C).
Impact property: it by the batten size of ISO179-1 prescribed by standard, is tested after being molded standard batten, in freely-supported
It carries out on beam shock machine, batten non-notch, is tested under room temperature (23 DEG C).
Vertical combustion grade: pressing UL94 V vertical combustion standard testing, and the sample of 1.6 mm of thickness hangs down in CZF-3 level
It is carried out on straight burning tester.
Hygrothermal environment accelerated ageing test: the stretching of standard, impact and fire-retardant batten are placed in the perseverance of 80 DEG C, 95%RH
In constant temperature and humidity case, test period 1500h observes the surface appearance of each batten after accelerated aging test, test bars
Tensile strength, impact strength, and with the data comparison before burn-in test, obtain the conservation rate of each mechanical performance index；By UL94
The Vertical Flame grade of batten after aging is tested in V vertical combustion standard method.
Embodiment 1
Polyamide, fire retardant, compatilizer, ionic surfactant are weighed by 1 data of embodiment shown in table 1, is mixed
Uniformly, mixed raw material is obtained.
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
The formula table (unit: gram) of the UL94-5VA grade flame retardancy reinforced polyamide composite material of 1 high durable of table
Embodiment 2
Polyamide, fire retardant, compatilizer, ionic surfactant are weighed by 2 data of embodiment shown in table 1, is mixed
Uniformly, mixed raw material is obtained.
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
Embodiment 3
Polyamide, fire retardant, compatilizer, ionic surfactant are weighed by 3 data of embodiment shown in table 1, is mixed
Uniformly, mixed raw material is obtained.
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
Embodiment 4
Polyamide, fire retardant, compatilizer, ionic surfactant are weighed by 4 data of embodiment shown in table 1, is mixed
Uniformly, mixed raw material is obtained.
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
Embodiment 5
Polyamide, fire retardant, compatilizer, ionic surfactant are weighed by 5 data of embodiment shown in table 1, is mixed
Uniformly, mixed raw material is obtained.
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
Embodiment 6
Polyamide, fire retardant, compatilizer, ionic surfactant are weighed by 6 data of embodiment shown in table 1, is mixed
Uniformly, mixed raw material is obtained.
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
Comparative example 1
64 grams of polyamide, 15 grams of fire retardant -3,6 grams of compatilizer are weighed, is uniformly mixed, it is former to obtain mixing
Expect
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The surface modified carbon fiber for weighing 15 grams, is placed in extruder screw
In side feed feed bin, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, draw ratio L/
D is 44, each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240
DEG C, 240 DEG C, 230 DEG C, engine speed be 250 revs/min, institute is obtained after the processes such as melting extrusion, granulation, drying process
State flame retardancy reinforced polyamide composite material
Comparative example 2
58 grams of polyamide, 15 grams of fire retardant -3,6 grams of compatilizer, 6 grams of ionic surfactant -2 are weighed, is mixed
It closes uniformly, obtains mixed raw material
Mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The carbon fiber that 15 grams of non-surface is modified is weighed, extruder spiral shell is placed in
In the side feed feed bin of bar, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, major diameter
Be 44 than L/D, each zone temperature that main barrel export from feed opening to head is set are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C,
240 DEG C, 240 DEG C, 230 DEG C, engine speed are 250 revs/min, are obtained after the processes such as melting extrusion, granulation, drying process
The flame retardancy reinforced polyamide composite material.
The test result of the UL94-5VA grade fire-retarding reinforced polyamide material of 2 high durable of table
For flame retardancy reinforced polyamide composite material system, since flame retardant rating is more demanding (at least V-0 grades), because
This, it is necessary to the fire retardant of higher components is added, and this brings direct influence to the weather-proof sex expression of polyamide compoiste material.
Common fire retardant can be divided into Phos nitrogen systems (embodiment 1,3,4), organic phosphorus system (embodiment in current polyamide material
2,5,6), and from embodiment 1-6 in table 1 from the point of view of the performance before and after weatherability burn-in test, organic hypo-aluminum orthophosphate (organic phosphorus body
System) performance will be obviously due to red phosphorus, MCA (Phos system).Be respectively adopted in embodiment 1,3 25%, 20% it is fire-retardant
Agent dosage, flame retardant rating under normal conditions meet the basic demand of V-0, but after burn-in test, flame retardant rating is equal
V-1 or V-2 is greatly reduced to, and mechanical property conservation rate is also only in 80-85% or so.And for embodiment 2,5,6,
Suitable active species and dosage, modified carbon fiber dosage can obtain satisfied modified effect, carbon fiber dosage in embodiment 2
It is very few, and the using effect of ionic surfactant -1 is unsatisfactory, therefore, the flame retardant rating of composite material after weathering still from
5VA is reduced to V-0, and the flame retardant rating of composite material remains at the high-grade of 5VA afterwards before ageing in embodiment 6, table
Excellent fire-retardant stability is revealed.
Further, by embodiment 6, comparative example 1 similar in contrast material recipe ingredient, comparative example 2 it is recognized that while right
Carbon fiber in ratio 1 is by surface treatment, but the addition due to lacking ionic surfactant, use, leads to polyamide substrate
Water imbibition does not have improvement, is easy migration in hygrothermal environment so as to cause fire retardant, is precipitated, therefore, the flame retardant rating of material
V-2 grades are greatly reduced to, the property retention rate of stretching, the impact of material is also only in 80-85% or so；And in comparative example 2, by
In carbon fiber without surface treatment, mechanical property hydrothermal aging after not high with the interface compatibility of polyamide substrate
Conservation rate is only in 60-70%, and fire retardant still has a small amount of precipitation, this has also directly influenced the vertical combustion performance of material；
And since the modified carbon fiber in surface and the collocation of efficient ionic surfactant use in embodiment 6, not only the surface of material is precipitated
Situation is obviously improved, it is often more important that the stretching of polyamide compoiste material, impact strength conservation rate are increased substantially to 90-
95%, also held in the good behaviour of 5VA grade, this shows poly- for fire-retardant enhancing vertical combustion grade after the aging of material
For the weatherability of amide composite material is improved, select suitable fire retardant no doubt important, but can not thoroughly solve its moisture-proof
The bad situation of hot property, and need to mention from the surface of carbon fiber is modified with the ionic surfactant of suitable species, dosage to cooperate with
Height, both sides improvement factor are indispensable.The fire-retarding reinforced polyamide that the technical solution obtains through the invention is compound
Material, the mechanics shown, flame retardant property stability are fully able to meet in current new energy car battery packet modular system
For the design requirement of the flame resistant polymer matrix composite material of high durable stability, meanwhile, it can also cope with well some important
Open-air industrial electronic apparatus the related improved demand of component hydrothermal stability.
Claims (8)
1. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable, it is characterised in that: including following parts by weight
Raw material:
Wherein, the modified carbon fiber in the surface is the basalt fibre of acrylate prepolymer body surface activation process.
2. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable according to claim 1, feature
Be: the modified carbon fiber in the surface the preparation method comprises the following steps: carbon fiber impregnates 30 in 60 DEG C, the alkaline solution of 30% concentration
Minute, sufficiently to remove the inorganic oxide and other impurities of fiber surface.By aqueous epoxy acrylate pre-polymerization after filtering out
Liquid solution is uniformly sprayed at carbon fiber surface, is then placed in 90 DEG C of vacuum oven, is evacuated to 0.05-0.01MPa.To carbon
After the moisture of fiber surface is removed, temperature is risen to 130 DEG C, is heated 2-4 hours, sufficiently solidify to acrylate prepolymer body in
The modified carbon fiber in surface is obtained after fiber surface.
3. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable according to claim 1, feature
It is: one or more of polyamide PA6, PA66, PA46, PA610, PA1010, PA612, PA1212 mixture.
4. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable according to claim 1, feature
Be: the fire retardant is the inorganic or organic compounds such as brominated Polystyrene, red phosphorus, melamine MCA, organic hypophosphites
One or more of object.
5. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable according to claim 1, feature
Be: the compatilizer is glycidyl methacrylate graft ethylene-ethyl acetate copolymer EVA-GMA.
6. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable according to claim 1, feature
Be: the amphipathic ionic surfactant is in higher fatty acid salt, alkylsulfonate, quaternary ammonium salt, phosphorus ester type compound etc.
One or more.
7. a kind of UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable according to claim 1, feature
Be: chopped felt of the carbon fiber for continuous carbon fibre roving, fibre diameter 7-13um, chopped length are
4.5-8mm。
8. the UL94-5VA grade flame retardancy reinforced polyamide composite material of high durable described in claim 1-7 is one of any, described
Method the following steps are included:
(1) polyamide, fire retardant, compatilizer, ionic surfactant are weighed by the parts by weight, is uniformly mixed, is mixed
Close raw material:
(2) mixed raw material after drying is placed in the main feeding bin for the double screw extruder that one tightly engages rotating Vortex
In, it is added in the machine barrel of extruder through feed screw；The modified carbon fiber in surface is placed in the side feed material of extruder screw
In storehouse, it is added in the machine barrel of extruder through feed screw.The diameter of screw extruder used is 36mm, and draw ratio L/D is 44,
Each zone temperature setting that main barrel is exported from feed opening to head are as follows: 150 DEG C, 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, 240
DEG C, 230 DEG C, engine speed be 250 revs/min, it is resistance to that the height is obtained after the processes such as melting extrusion, granulation, drying process
The UL94-5VA grade flame retardancy reinforced polyamide composite material of time.
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Application publication date: 20191105 |