CN103665830A - Polyamide composition and preparation method thereof - Google Patents
Polyamide composition and preparation method thereof Download PDFInfo
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- CN103665830A CN103665830A CN201210316890.8A CN201210316890A CN103665830A CN 103665830 A CN103665830 A CN 103665830A CN 201210316890 A CN201210316890 A CN 201210316890A CN 103665830 A CN103665830 A CN 103665830A
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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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- 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
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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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
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2203/00—Applications
- C08L2203/12—Applications used for fibers
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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
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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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
Abstract
The invention discloses a polyamide composition and a preparation method thereof. The composition comprises melamine compounds and carbon black. The preparation method comprises steps of slicing the polyamide, extruding the melamine compounds and carbon black in a twin-screw extruder to obtain the polyamide composition, wherein the melamine compounds are added in the form of 5-50wt% melamine compound sizing agent, a snakelike pump sizing agent adding device is used for metering the sizing agent accurately and continuously conveying the sizing agent to the twin-screw extruder. The polyamide composite has good antiflaming stability, and can be used in fields of spinning, thin films and the like.
Description
Technical field
The present invention relates to a kind of daiamid composition that contains trimeric cyanamide compounds and carbon black and preparation method thereof.
Background technology
Polymeric amide is high as intensity, and wear resistance is good, and the application of the good material of weathering resistance in industrial circle and daily life is more and more extensive.But because polymeric amide is the flammable polymkeric substance of a kind of meltbility, once contact burning things which may cause a fire disaster is easy to lead to fire, so its application has also been subject to certain restriction.
About thering is the research of the polymeric amide aspect of flame retardant effect, get more and more, the method of at present polymeric amide being carried out to fire-retardantization mainly contains three kinds: the first is copolymerization method, by introduce aromatic ring or fragrant heterocycle in the macromolecular chain of polymeric amide, increase intensity and the force of cohesion of macromole chain rigidity and macromolecular chain, thereby improve the thermostability of polymeric amide; The second is blending method, by adding fire retardant to carry out blend in polyamide melt, makes polymeric amide have flame retardant effect; The third is to utilize fire-retardant medicament to carry out fire-retardant finish to polymeric amide.Because the cost of copolymerization method is high, the flame retardant effect of fire-retardant medicament finishing method again can not be lasting, and studying now many is blending method.In Chinese invention patent CN200710011841.2, disclose nylon 6, trimeric cyanamide urate, retardant synergist, oxidation inhibitor have been mixed to get to the method for fire-retardant nylon by weight ratio in high-speed mixer.But trimeric cyanamide urate is one very easily there is the compound of reuniting, and directly with the form of powder, adds in polymeric amide and there will be and disperse inhomogeneous phenomenon, and then affect the fire-retardant stability of Flameproof polyamide.
Summary of the invention
The object of the present invention is to provide a kind of daiamid composition with excellent and stable flame retardant properties, said composition is obtained by polymeric amide, trimeric cyanamide compounds and carbon black.
Technical solution of the present invention is:
A daiamid composition, wherein contains trimeric cyanamide compounds and carbon black, and trimeric cyanamide compounds accounts for 2～30wt% of composition weight, and its particle diameter is 0.03～5.0 μ m; Carbon black accounts for 0.5～5wt% of composition weight.
Reuniting effect due to trimeric cyanamide compounds itself, in daiamid composition, trimeric cyanamide compounds exists with the form of particulate, the size of this diameter of particle can be used to weigh the dispersiveness of trimeric cyanamide compounds in daiamid composition, more the bright dispersiveness of novel is better for particle diameter, and the larger explanation dispersiveness of particle diameter is poorer.The dispersed missionary society of trimeric cyanamide compounds affects daiamid composition spinning workability and fire-retardant stability, the large phenomenon of flame retardant effect difference while there is sampling and testing flame retardant resistance.In composition of the present invention, the particle diameter of trimeric cyanamide compounds is 0.03～5.0 μ m, preferably 0.03～1.0 μ m.In this particle size range, the excellent in flame retardance of daiamid composition and stable not only, its spinning property might as well.
In daiamid composition of the present invention, the content of trimeric cyanamide compounds is 2～30wt%.If its too high levels, is unfavorable for the dispersion of trimeric cyanamide compounds in polymeric amide, cause the particle of polyamide-based compound particulate excessive, affect thermotolerance and the spinning property of daiamid composition; If its content is too low, the flame retardant effect of daiamid composition is bad.The content of trimeric cyanamide compounds is 5～20wt% preferably.
Trimeric cyanamide compounds of the present invention can be trimeric cyanamide, melamine pyrophosphate, melamine borate salt, melamine cyanurate, melamine phosphate, melamine polyphosphate or other melamine derivatives, wherein preferably trimeric cyanamide, melamine cyanurate, melamine phosphate or melamine polyphosphate, most preferably melamine cyanurate.
In daiamid composition of the present invention, also contain carbon black, its content is the 0.5～5wt% that is equivalent to composition weight.In combustion processes, carbon black can form carbon-coating on daiamid composition surface, can make composition and flame keep apart on the one hand, stops further carrying out of burning; Carbon-coating also has heat-absorbing action on the other hand, can reduce the heat of oxidation of composition self, reaches the fire-retardant object of solid phase; Moreover carbon black produces the difficult combustion gas body of carbonic acid gas in when burning, can dilution oxygen concentration, reduce the intensity of flame, also played the fire-retardant effect of certain gas phase.If the content of carbon black is very little in composition, during burning, be difficult for forming carbon-coating on daiamid composition surface, do not have the effect of fire-retardant enhancing; If the content of carbon black is too many in composition, because carbon black itself is inflammable substance, excessive carbon black can promote the burning of daiamid composition, reduces its flame retardant properties.Preferably the content of carbon black is 0.75～2wt%.
Above-mentioned carbon black can be the carbon black in various sources, as channel black, warmly black, dim, furnace black or acetylene black, and wherein preferably furnace black or acetylene black.
Polymeric amide of the present invention comprises polyamide 6, polyamide 66 or the above two alloy, preferred polyamide 6.
The invention also discloses the production method of this daiamid composition, polymeric amide section, trimeric cyanamide compounds and carbon black are dropped in twin screw extruder and extrude and obtain daiamid composition, wherein the addition of polymeric amide section accounts for 65～97.5wt% of composition, the addition of carbon black accounts for 0.5～5wt% of composition, and all the other are trimeric cyanamide compounds; The form that the concentration of take while adding trimeric cyanamide compounds is 5～50wt% melamine class compound pulp, carries out accurate measurement and is transported in twin screw extruder continuously slurry with snakelike pump formula slurry adding set.
Because trimeric cyanamide compounds is easily reunited, easily forming the particle of large particle diameter when polyamide blended, affect fire-retardant stability and the spinning property of final composition.Form with its aqueous solution while adding trimeric cyanamide compounds in the present invention is added, and first trimeric cyanamide compounds is mixed to the slurry of the trimeric cyanamide compounds that formation concentration is 5～50wt% with certain proportion with water.While adding with this form, trimeric cyanamide compounds and water are by the good combination of hydrogen bond energy, trimeric cyanamide compounds is dispersed in water, thereby has suppressed the reunion of trimeric cyanamide compounds, guarantee it and can not form the particle of large particle diameter when polyamide blended.In addition, the moisture content in melamine class compound pulp evaporates and discharges from water vapour relief outlet when blend, to the performance of daiamid composition, can not impact.When above-mentioned slurry concentration is less than 5wt%, the water mixing with polymeric amide is too many, can cause polymeric amide that significantly hydrolysis occurs, and affects the flame retardant properties of daiamid composition, and can increase the power of the snakelike pump of carrying slurry, raises the cost; When slurry concentration is greater than 50wt%, the poor fluidity of slurry, difficulty of transportation, and be difficult for while mixing with polymeric amide disperseing.
While adding melamine class compound pulp in the present invention, with snakelike pump formula slurry adding set, slurry is carried out accurate measurement and is transported to continuously in twin screw extruder, its delivery port is arranged on the descending place of the section opening for feed of twin screw extruder.And water vapour generation adverse current is discharged from section opening for feed when preventing blend, polymeric amide section meets that water vapour occurs to assemble and the opening for feed place that is deposited in section, causing cutting into slices charging freely cannot blend, so be provided with water vapour relief outlet between the delivery port of slurry and the opening for feed of section.
Daiamid composition of the present invention not only has excellent flame retardant properties, and the dispersion particle diameter of trimeric cyanamide compounds in composition little, be evenly distributed, the fire-retardant good stability of composition, can be used for the fields such as spinning, film.
Testing method related in the present invention is described as follows:
(1) particle diameter of trimeric cyanamide compounds:
By transmission electron microscope (TEM), measure.
(2) content of trimeric cyanamide compounds and carbon black:
10g sample is put into 500ml phenol/ethanolic soln, and long-time stirring guarantees that sample can fully dissolve.High-speed centrifuge for mixed solution (18000rpm) after dissolving carries out centrifugation.Product after separation claims to obtain weight M after being fully dried
1, then by dried product 500 ℃ of heat 2 hours under nitrogen or vacuum environment.After product after heat is cooling, claim to obtain weight M
2, finally calculate the content of trimeric cyanamide compounds,
(3) evaluation method of flame retardant properties:
Get 10 daiamid compositions, according to standard JIS 1091 D:1999 methods, measure its flame retardant resistance, result is got the mean value of 10 times.
(4) evaluation method of flame retardant properties stability:
Get 10 daiamid composition battens, by JIS 1091 D methods, carry out respectively flame retardant test and record the scorching number X that returns of connecing of every batten
i, calculate the scorching number mean value X that returns of connecing of 10 samples simultaneously, finally by calculating, connect the fire-retardant stability that scorching standard deviation of returning number represents daiamid composition,
When standard deviation value is 0, illustrate that the flame retardant properties of daiamid composition is very stable; Standard deviation value is larger, illustrates that its flame retardant properties is more unstable.
Embodiment
Below in conjunction with embodiment, content of the present invention is described, but the present invention is not limited to the listed content of embodiment.
Embodiment 1
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 30wt% is standby.Together with after polyamide 6 section is evenly mixed with acetylene black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 89wt% of composition, and the addition of acetylene black accounts for the 1wt% of composition.
The content of melamine cyanurate and carbon black in sampling and testing daiamid composition, and the size of melamine cyanurate; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 2
First melamine phosphate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 30wt% is standby.Together with after polyamide 66 section is evenly mixed with acetylene black, put in twin screw extruder, with snakelike pump formula slurry adding set, melamine phosphate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 66 section accounts for the 84.5wt% of composition, and the addition of acetylene black accounts for the 0.5wt% of composition.
The content of melamine phosphate and carbon black in sampling and testing daiamid composition, and the size of melamine phosphate; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 3
First trimeric cyanamide polyphosphoric acid and water are mixed, fully stirred, the trimeric cyanamide polyphosphoric acid slurry of making concentration and be 5wt% is standby.Together with after polyamide 66 section is evenly mixed with furnace black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide polyphosphoric acid slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 66 section accounts for the 79.25wt% of composition, and the addition of furnace black accounts for the 0.75wt% of composition.
The content of trimeric cyanamide polyphosphoric acid and carbon black in sampling and testing daiamid composition, and the size of trimeric cyanamide polyphosphoric acid; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 4
First trimeric cyanamide and water are mixed, fully stirred, the trimeric cyanamide slurry of making concentration and be 35wt% is standby.Together with after the alloy section of polyamide 6 and polyamide 66 is evenly mixed with furnace black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of the alloy of polyamide 6 and polyamide 66 section accounts for the 68.5wt% of composition, and the addition of furnace black accounts for the 1.5wt% of composition.
The content of trimeric cyanamide and carbon black in sampling and testing daiamid composition, and the size of trimeric cyanamide.Get 10 batten test flame retardant resistances and fire-retardant stability; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 5
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 15wt% is standby.Together with after polyamide 6 section is evenly mixed with acetylene black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 93wt% of composition, and the addition of acetylene black accounts for the 2wt% of composition.
The content of trimeric cyanamide nitrile urate and carbon black in sampling and testing daiamid composition, and the uratic size of trimeric cyanamide nitrile; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 6
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 30wt% is standby.Together with after polyamide 6 section is evenly mixed with furnace black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 93wt% of composition, and the addition of furnace black accounts for the 5wt% of composition.
The content of trimeric cyanamide nitrile urate and carbon black in sampling and testing daiamid composition, and the uratic size of trimeric cyanamide nitrile; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 7
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 30wt% is standby.Together with after polyamide 6 section is evenly mixed with acetylene black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 87wt% of composition, and the addition of acetylene black accounts for the 3wt% of composition.
The content of trimeric cyanamide nitrile urate and carbon black in sampling and testing daiamid composition, and the uratic size of trimeric cyanamide nitrile; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 8
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 40wt% is standby.Together with after polyamide 66 section is evenly mixed with acetylene black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 66 section accounts for the 69wt% of composition, and the addition of acetylene black accounts for the 1wt% of composition.
The content of trimeric cyanamide nitrile urate and carbon black in sampling and testing daiamid composition, and the uratic size of trimeric cyanamide nitrile; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Embodiment 9
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 50wt% is standby.Together with after polyamide 6 section is evenly mixed with furnace black, put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 69wt% of composition, and the addition of furnace black accounts for the 1wt% of composition.
The content of trimeric cyanamide nitrile urate and carbon black in sampling and testing daiamid composition, and the uratic size of trimeric cyanamide nitrile; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Comparative example 1
First trimeric cyanamide nitrile urate and water are mixed, fully stirred, the trimeric cyanamide nitrile urate slurry of making concentration and be 30wt% is standby.Polyamide 6 section is put in twin screw extruder, with snakelike pump formula slurry adding set, trimeric cyanamide nitrile urate slurry is carried out accurate measurement and is transported to continuously in twin screw extruder simultaneously, the two blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 90wt% of composition, and the uratic addition of trimeric cyanamide nitrile accounts for the 10wt% of composition.
The uratic content of trimeric cyanamide nitrile and size in sampling and testing daiamid composition; Get 10 battens and test its flame retardant resistance and fire-retardant stability, concrete outcome sees attached list.
Comparative example 2
Trimeric cyanamide nitrile urate and water are mixed, fully stirred, and making concentration is the trimeric cyanamide nitrile urate slurry of 60wt%.Prepared slurry is the uneven thing of trimeric cyanamide nitrile urate powder and water, and flowing property extreme difference can not be measured, is transported in twin screw extruder by snakelike pump formula slurry adding set.
Comparative example 3
After polyamide 6 section, trimeric cyanamide nitrile urate powder and acetylene black are evenly mixed, put in twin screw extruder, three's blending extrusion obtains daiamid composition.Wherein, the addition of polyamide 6 section accounts for the 85wt% of composition, and the uratic addition of trimeric cyanamide nitrile accounts for the 10wt% of composition, and the addition of acetylene black accounts for the 5wt% of composition.
The content of trimeric cyanamide nitrile urate and carbon black in sampling and testing daiamid composition, and the uratic size of trimeric cyanamide nitrile; Get 10 battens and test its flame retardant resistance and fire-retardant stability, the flame retardance results of 10 battens differs larger, connects the scorching number that returns from 1～6 not etc., and concrete outcome sees attached list.
Design parameter and the physicals of in embodiment and comparative example, preparing daiamid composition see attached list, and in table, slurry concentration refers to that melamine class Compound Phase in slurry is for the weight ratio of slurry.
Claims (9)
1. a daiamid composition, is characterized in that: in said composition, contain trimeric cyanamide compounds and carbon black, wherein trimeric cyanamide compounds accounts for 2～30wt% of composition weight, and its particle diameter is 0.03～5.0 μ m; Carbon black accounts for 0.5～5wt% of composition weight.
2. daiamid composition according to claim 1, is characterized in that: the particle diameter of described trimeric cyanamide compounds is 0.03～1.0 μ m.
3. daiamid composition according to claim 1 and 2, is characterized in that: described trimeric cyanamide compounds accounts for 5～20wt% of composition weight.
4. daiamid composition according to claim 1 and 2, is characterized in that: described trimeric cyanamide compounds is trimeric cyanamide, melamine cyanurate, melamine phosphate or melamine polyphosphate.
5. daiamid composition according to claim 1, is characterized in that: described carbon black is furnace black or acetylene black.
6. daiamid composition according to claim 1 or 5, is characterized in that: described carbon black accounts for 0.75～2wt% of composition weight.
7. daiamid composition according to claim 1, is characterized in that: described polymeric amide is polyamide 6.
8. the preparation method of a daiamid composition claimed in claim 1, it is characterized in that: polymeric amide section, trimeric cyanamide compounds and carbon black are dropped in twin screw extruder and extrude and obtain daiamid composition, wherein the addition of polymeric amide section accounts for 65～97.5wt% of composition, the addition of carbon black accounts for 0.5～5wt% of composition, and all the other are trimeric cyanamide compounds; The form that the concentration of take while adding trimeric cyanamide compounds is 5～50wt% melamine class compound pulp, carries out accurate measurement and is transported in twin screw extruder continuously slurry with snakelike pump formula slurry adding set.
9. the preparation method of daiamid composition according to claim 8, is characterized in that: the concentration of described melamine class compound pulp is 15～35wt%.
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| CN110305471A (en) * | 2019-07-11 | 2019-10-08 | 常州威材新材料科技有限公司 | A kind of black nylon composite materials of scratch-resistant piano and preparation method thereof |
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