CN113789042B - Flame-retardant environment-friendly PC-ABS composite plastic master batch and preparation method thereof - Google Patents
Flame-retardant environment-friendly PC-ABS composite plastic master batch and preparation method thereof Download PDFInfo
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- C08J2455/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2423/00 - C08J2453/00
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Abstract
The application relates to the technical field of high polymer materials, in particular to a flame-retardant environment-friendly PC-ABS composite plastic master batch and a preparation method thereof, wherein the PC-ABS composite plastic master batch is prepared from the following raw materials in parts by weight: 55-65 parts of PC resin, 0-20 parts of ABS resin, 5-10 parts of flame retardant auxiliary agent, 2-4 parts of filler, 3-5 parts of plasticizer and 0.5-1 part of anti-aging agent; the preparation method comprises the following steps: auxiliary agent mixing-auxiliary agent master batch mixing-extrusion-granulation; the preparation method has the advantages of simple operation and high yield; the flame-retardant environment-friendly PC-ABS composite plastic master batch is applied to functional mobile phone battery covers, helmets, mice, automobile door handles and the like, and raw materials adopted in the flame-retardant environment-friendly PC-ABS composite plastic master batch are environment-friendly materials, and the flame-retardant environment-friendly PC-ABS composite plastic master batch is compounded through the raw materials, so that the obtained flame-retardant environment-friendly PC-ABS composite plastic master batch has good flame retardance, toughness, high temperature resistance and plasticity.
Description
Technical Field
The application relates to the technical field of high polymer materials, in particular to a flame-retardant environment-friendly PC-ABS composite plastic master batch and a preparation method thereof.
Background
The PC-ABS composite plastic is a compound of polycarbonate and acrylonitrile-butadiene-styrene copolymer (ABS resin), wherein the polycarbonate is a high polymer with a carbonate group in a molecular chain, and is a tough thermoplastic resin, and the polycarbonate has the advantages of colorless transparency, heat resistance, impact resistance, flame retardance and the like; the ABS resin is thermoplastic engineering plastic with extremely wide application, and has the advantages of good impact resistance, heat resistance, low temperature resistance, chemical resistance, electrical property and the like.
Thermoplastic plastics compounded by polycarbonate and acrylonitrile-butadiene-styrene copolymer (ABS resin) combine the excellent characteristics of the two materials; the PC-ABS composite plastic has improved impact strength, temperature resistance, ultraviolet resistance and other properties, and can be widely used in the fields of automobile parts, mobile phone parts, computer parts, articles for daily use and the like.
Although PC-ABS composite plastics have certain flame retardant property, the flame retardant effect is poor, in order to improve the flame retardance of PC-ABS composite plastics, a halogen-containing flame retardant auxiliary agent is generally added, so that the PC-ABS composite plastics are improved, but halogen-containing materials generate harmful gases after being combusted, and the environment is influenced; or adding flame retardant auxiliary agents such as antimony trioxide, magnesium hydroxide, aluminum hydroxide and the like, while improving the flame retardance of the PC-ABS composite plastic, the compatibility of the antimony trioxide, the magnesium hydroxide, the aluminum hydroxide and the PC-ABS composite plastic is poor, and the dosage is generally 40-60%, so that the mechanical property of the PC-ABS composite plastic is seriously influenced; there are also flame retardant additives of organic type added, but the flame retardant effect is to be improved.
Disclosure of Invention
In order to improve the flame retardance of PC-ABS composite plastics, the application provides a flame-retardant environment-friendly PC-ABS composite plastic master batch and a preparation method thereof, wherein PC-ABS composite plastics are adopted to refer to PC-ABS composite plastics.
In a first aspect, the present application provides a flame retardant and environment-friendly PC-ABS composite plastic masterbatch, which adopts the following technical scheme:
a flame-retardant environment-friendly PC-ABS composite plastic master batch is prepared from the following raw materials in parts by weight:
55-65 parts of PC resin
ABS resin: 10-20 parts
Flame retardant auxiliary: 5-10 parts
Filler: 2-3 parts
And (3) a plasticizer: 3-5 parts of an anti-aging agent: 0.5-1 part.
By adopting the technical scheme, the weight parts of the raw materials and the composition of the raw materials are in the preferred range of the raw material composition and the weight parts of the raw materials; the PC-ABS composite plastic master batch with better impact resistance, heat resistance and flame retardance is obtained through the composite modification of the PC resin and the ABS resin; the mechanical property of the PC-ABS composite plastic is enhanced by adding the filler; the added plasticizer has the advantages of environmental protection, good compatibility with resin, small permeability, low volatility and high plasticizing efficiency, improves the plasticity of the PC-ABS composite plastic master batch, enhances the flexibility of the PC-ABS composite plastic master batch and is easy to process; the added anti-aging agent has the advantages of environmental protection and oxidation resistance, and the added flame retardant auxiliary agent has better flame retardance, heat resistance, oxidation resistance and self-extinguishing property, so that the prepared PC-ABS composite plastic master batch has better flame retardance, heat resistance, oxidation resistance, plasticity and toughness.
Preferably, the flame retardant auxiliary is obtained by mixing polysiloxane and modified nano silicon dioxide in a weight ratio of 1:3-8.
By adopting the technical scheme, the polysiloxane and the modified nano silicon dioxide have synergistic effect, all contain silicon groups, have the advantages of high efficiency, low toxicity, molten drop prevention and no halogen, are also a char-forming smoke suppressant, and have better flame retardance, heat resistance, oxidation resistance and self-extinguishing property, and the flame retardance, heat resistance, oxidation resistance and self-extinguishing property of the prepared PC-ABS composite plastic master batch can be improved by adding the polysiloxane and the modified nano silicon dioxide into a composite material of PC resin and ABS resin.
Specifically, polysiloxane and modified nano silicon dioxide are added into PC-ABS composite plastic master batch, so that the surface of the PC-ABS composite plastic master batch forms a polymer gradient material of an enrichment layer, and when the PC-ABS composite plastic master batch burns, an inorganic oxygen-insulating heat-insulating protective layer containing Si bonds and/or Si-C bonds is generated, thereby reducing the escape of combustion decomposition products, inhibiting the thermal decomposition of the PC-ABS composite plastic master batch and realizing the flame retardant effect.
Preferably, the preparation of the modified nano-silica comprises the following steps:
step 1: weighing 80-120 parts by weight of nano silicon dioxide and 150-200 parts by weight of propylene glycol, uniformly mixing, and oscillating for 5-10min to obtain a suspension A;
step 2: weighing 5-8 parts by weight of vinyltriethoxysilane, adding into the suspension A obtained in the step 1, uniformly stirring, heating to 55-65 ℃, and reacting for 3-5 hours to obtain a mixture B;
step 3: 3-5 parts by weight of 3-aminopropyl triethoxysilane are weighed, added into the mixture B obtained in the step 2, stirred uniformly, heated to 70-80 ℃, reacted at constant temperature for 2-3 hours, oscillated for 3-5 minutes, cooled to room temperature, filtered, dried, ground and sieved for 100-200 meshes to obtain the modified nano silicon dioxide.
Generally, nano silicon dioxide is difficult to infiltrate and disperse in an organic medium, ethylene glycol is added to be mixed with nano silicon dioxide, and then vibration is carried out, so that nano silicon dioxide and ethylene glycol form dispersion liquid, the agglomeration phenomenon of nano silicon dioxide is reduced, the nano silicon dioxide is easier to react with 3-aminopropyl triethoxysilane and vinyl triethoxysilane, the 3-aminopropyl triethoxysilane and vinyl triethoxysilane are added step by step, the reaction with nano silicon dioxide is facilitated, the reaction is carried out thoroughly through step heating, and the yield and purity of the obtained modified nano silicon dioxide are higher.
The siloxane bond of the nano silicon dioxide is condensed with the siloxane bonds of the 3-aminopropyl triethoxy silane and the vinyl triethoxy silane, so that the modified nano silicon dioxide has oleophylic hydrophobicity, the fusion property of the modified nano silicon dioxide and the resin is further improved, and the obtained PC-ABS composite plastic has better flame retardance.
Preferably, the preparation of the nano silicon dioxide comprises the following steps:
step A: weighing 0.5-1 part of sodium persulfate and 1-2 parts of polyethylene glycol according to parts by weight, stirring and dissolving in water to obtain a mixture I for later use; weighing 65-80 parts of concentrated sulfuric acid with the mass fraction of 90-95% and 3-5 parts of hydrogen peroxide, and uniformly mixing to obtain a mixture II for later use; weighing 3-5 parts of sodium carbonate, and dissolving in 100-200 parts of sodium hydroxide solution with mass fraction of 5-10% to obtain a mixture III;
and (B) step (B): weighing 50-60 parts of sodium silicate and 1-3 parts of sodium sulfate according to parts by weight, dissolving in water, dropwise adding the mixture II obtained in the step A, and uniformly stirring to obtain a mixture IV;
step C: adding the mixture I into the mixture IV obtained in the step B, reacting for 65-80min, adding the filter residue obtained after suction filtration into the mixture III obtained in the step A, uniformly stirring, standing for 2-3min, washing with water, suction filtration, drying, calcining, grinding, and sieving with 100-200 meshes to obtain the nano silicon dioxide.
According to the technical scheme, sodium sulfate is added to play a role in dispersing, so that sodium silicate is uniformly dispersed in water, concentrated sulfuric acid reacts with sodium silicate, prepared silicic acid is precipitated, hydrogen peroxide has strong oxidizing property, the reaction of concentrated sulfuric acid and sodium silicate can be accelerated, polyethylene glycol is added as a surfactant to promote the reaction activity of sodium silicate, meanwhile, the added sodium persulfate and hydrogen peroxide have a synergistic effect, the reaction can be further promoted, sulfuric acid and sodium silicate react more thoroughly, generated silicic acid is promoted to be neutralized through a mixed solution of sodium hydroxide and sodium carbonate, and silicon dioxide is obtained after calcination and dehydration.
Preferably, the filler is one or a combination of a plurality of kaolin, talcum powder and carbon fiber.
According to the technical scheme, when the kaolin, the talcum powder and the carbon fiber are mixed, the weight ratio of the kaolin to the talcum powder to the carbon fiber is 1:1-1.2:1-1.5; moreover, the kaolin, the talcum powder and the carbon fiber have synergistic effect, so that the plasticity and the heat resistance of the PC-ABS composite plastic master batch can be improved, the PC-ABS composite plastic master batch is easier to process, and the flame retardance of the PC-ABS composite plastic master batch is improved.
Preferably, the mesh numbers of the kaolin and the talcum powder are 100-200 meshes, and the mesh number range can enable the kaolin and the talcum powder to be fully mixed with the base materials PC and ABS, so that the prepared PC-ABS composite plastic master batch has good plasticity and heat resistance, and further the flame retardance of the PC-ABS composite plastic master batch is improved.
Preferably, the plasticizer is a mixture of acetyl tributyl citrate and dioctyl phthalate.
According to the technical scheme, the acetyl tributyl citrate has the advantages of high plasticizing efficiency, environmental protection, no toxicity, long thermal stability time and good compatibility, the plasticity and the thermal stability of the PC-ABS composite plastic can be improved, the dioctyl phthalate and the acetyl tributyl citrate have a synergistic plasticizing effect, the secondary valence bond among molecules of the PC-ABS composite plastic can be weakened, the mobility of the molecular bond of the PC-ABS composite plastic is increased, the crystallinity of resin molecules is reduced, the plasticity of the PC-ABS composite plastic is further improved, and the PC-ABS composite plastic has better toughness.
Preferably, the acetyl tributyl citrate and the dioctyl phthalate are mixed according to the weight ratio of 1:0.1-0.3, and the acetyl tributyl citrate and the dioctyl phthalate in the weight ratio can play a good plasticizing role on PC-ABS composite plastics, so that the toughness of the PC-ABS composite plastics master batch is improved.
Preferably, the anti-aging agent is beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate stearyl alcohol and/or 4,4' -thiobis (6-tert-butyl-3-methylphenol).
Through the technical scheme, the beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and the 4,4' -thiobis (6-tert-butyl-3-methylphenol) have the characteristics of environmental protection, have synergistic oxidation resistance, and can improve the oxidation resistance of PC-ABS composite plastic master batches.
In a second aspect, the application provides a preparation method of a flame-retardant environment-friendly PC-ABS composite plastic master batch, which comprises the following steps:
s1: weighing 5-10 parts by weight of flame retardant auxiliary, 2-4 parts by weight of filler and 3-5 parts by weight of filler
The plasticizer and 0.5-1 part of anti-aging agent are uniformly mixed to obtain a mixture A;
s2: weighing 55-65 parts of PC resin and 10-20 parts of ABS resin according to parts by weight, uniformly mixing, adding the mixture A obtained by S1, mixing for 3-5 minutes, extruding, granulating and drying to obtain the PC-ABS composite plastic master batch.
By adopting the technical scheme, the auxiliary agent is uniformly mixed firstly, then the PC and the ABS are mixed with the auxiliary agent, the purpose of the auxiliary agent is to fully coat the particles of the PC resin and the ABS resin, the auxiliary agent is fully mixed, and the operations of extrusion, granulation, drying and the like are carried out, so that the prepared PC-ABS composite plastic master batch has better flame retardance, heat resistance, antioxidation, plasticity and toughness.
In summary, the present application has the following beneficial effects:
1. as the flame retardant is adopted, the flame retardant property of the PC-ABS composite plastic master batch is further improved.
2. In the application, the modified nano silicon dioxide is preferably adopted, and the organic silicon is used for modification, so that the obtained modified nano silicon dioxide has better flame retardance, and the flame retardance of the PC-ABS composite plastic master batch is increased.
3. According to the preparation method, the secondary valence bonds among the PC-ABS composite plastic master batch molecules can be weakened through acetyl tributyl citrate and dioctyl phthalate, the mobility of the PC-ABS composite plastic master batch molecular bonds is increased, the crystallinity of resin molecules is reduced, the plasticity of the PC-ABS composite plastic master batch is further improved, and the PC-ABS composite plastic master batch obtains better toughness.
Detailed Description
The present application is described in further detail below with reference to examples.
TABLE 1 sources of the raw material components
The raw material manufacturer types in table 1 are all specifically selected as auxiliary agents in the experimental process and are used for supporting the preparation examples and examples of the application, but in practice, the preparation raw materials of the PC-ABS composite plastic master batch are not limited to the manufacturer types.
Preparation example
Preparation example of nanosilica
Preparation example 1
A method for preparing nano-silica, comprising the steps of:
step A: 1Kg of sodium persulfate and 2Kg of polyethylene glycol are weighed and dissolved in deionized water under stirring to obtain a mixture I for later use; weighing 80Kg of concentrated sulfuric acid with the mass fraction of 95% and 5Kg of hydrogen peroxide, and uniformly mixing to obtain a mixture II for later use; weighing 5Kg of sodium carbonate and dissolving in 200Kg of sodium hydroxide solution with the mass fraction of 10% to obtain a mixture III;
and (B) step (B): weighing 60Kg of sodium silicate and 3Kg of sodium sulfate, dissolving in water, dropwise adding the mixture II obtained in the step A, and uniformly stirring to obtain a mixture IV;
step C: adding the mixture I into the mixture IV obtained in the step B, reacting for 80min, carrying out suction filtration by using a vacuum suction filter, adding filter residues into the mixture III obtained in the step A, uniformly stirring, standing for 3min, carrying out suction filtration by using the vacuum suction filter, flushing the suction filtration process by using deionized water, putting into a 50 ℃ oven for drying, putting into a high-temperature calciner with the set temperature of 600 ℃ for calcination, grinding, and sieving by 200 meshes to obtain the nano silicon dioxide.
Preparation example 2
A method for preparing nano-silica, comprising the steps of:
step A: weighing 0.75Kg of sodium persulfate and 1.5Kg of polyethylene glycol, stirring and dissolving in deionized water to obtain a mixture I for later use; weighing 75Kg of concentrated sulfuric acid with the mass fraction of 93% and 4Kg of hydrogen peroxide, and uniformly mixing to obtain a mixture II for later use; weighing 4Kg of sodium carbonate and dissolving in 150Kg of sodium hydroxide solution with mass fraction of 7.5% to obtain a mixture III; and (B) step (B): weighing 55Kg of sodium silicate and 2Kg of sodium sulfate, dissolving in water, dropwise adding the mixture II obtained in the step A, and uniformly stirring to obtain a mixture IV;
step C: adding the mixture I into the mixture IV obtained in the step B, reacting for 70min, carrying out suction filtration by using a vacuum suction filter, adding filter residues into the mixture III obtained in the step A, uniformly stirring, standing for 2.5min, carrying out suction filtration by using the vacuum suction filter, flushing the suction filtration process by using deionized water, putting into a 50 ℃ oven for drying, putting into a high-temperature calciner with the set temperature of 600 ℃ for calcination, grinding, and sieving for 150 meshes to obtain the nano silicon dioxide.
Preparation example 3
A method for preparing nano-silica, comprising the steps of:
step A: weighing 0.5Kg of sodium persulfate and 1Kg of polyethylene glycol, stirring and dissolving in deionized water to obtain a mixture I for later use; weighing 75Kg of concentrated sulfuric acid with the mass fraction of 90% and 4Kg of hydrogen peroxide, and uniformly mixing to obtain a mixture II for later use; 3Kg of sodium carbonate is weighed and dissolved in 100Kg of sodium hydroxide solution with the mass fraction of 5% to obtain a mixture III;
and (B) step (B): weighing 50Kg of sodium silicate and 1Kg of sodium sulfate, dissolving in water, dropwise adding the mixture II obtained in the step A, and uniformly stirring to obtain a mixture IV;
step C: adding the mixture I into the mixture IV obtained in the step B, reacting for 65min, carrying out suction filtration by using a vacuum suction filter, adding filter residues into the mixture III obtained in the step A, uniformly stirring, standing for 2min, carrying out suction filtration by using the vacuum suction filter, flushing the suction filtration process by using deionized water, putting into a 50 ℃ oven for drying, putting into a high-temperature calciner with the set temperature of 600 ℃ for calcination, grinding, and sieving for 100 meshes to obtain the nano silicon dioxide.
Preparation example of modified nanosilica
Preparation example 4
The preparation of the modified nano silicon dioxide comprises the following steps:
step 1: weighing 120Kg of nano silicon dioxide prepared in preparation example 1 and 200Kg of propylene glycol, uniformly mixing, putting into ultrasonic waves, and vibrating for 10min to enable the nano silicon dioxide to be fully dispersed in the propylene glycol to obtain suspension A;
step 2: weighing 8Kg of vinyl triethoxysilane, adding the vinyl triethoxysilane and the suspension A obtained in the step 1 into a four-necked flask with a reflux condenser pipe of 500mL, placing the flask into a magnetic heating stirrer, uniformly stirring, heating to 65 ℃, and reacting for 5 hours to obtain a mixture B;
step 3: weighing 5Kg of 3-aminopropyl triethoxysilane, adding into the mixture B obtained in the step 2, stirring uniformly, heating to 80 ℃, reacting at constant temperature for 3 hours, placing into ultrasonic waves to oscillate for 5 minutes, cooling to room temperature, performing suction filtration under the condition that a vacuum gauge shows-0.1 Mpa, placing into a 50 ℃ oven to dry, grinding, sieving with 200 meshes, and obtaining the modified nano silicon dioxide.
Preparation example 5
The preparation of the modified nano silicon dioxide comprises the following steps:
step 1: weighing 100Kg of nano silicon dioxide prepared in preparation example 2 and 150Kg of propylene glycol, uniformly mixing, putting into ultrasonic waves, and oscillating for 8min to enable the nano silicon dioxide to be fully dispersed in the propylene glycol to obtain suspension A;
step 2: weighing 6Kg of vinyl triethoxysilane, adding the vinyl triethoxysilane and the suspension A obtained in the step 1 into a four-necked flask with a reflux condenser pipe of 500mL, placing the flask into a magnetic heating stirrer, uniformly stirring, heating to 60 ℃, and reacting for 4 hours to obtain a mixture B;
step 3: and (2) weighing 4Kg of 3-aminopropyl triethoxysilane, adding the 3-aminopropyl triethoxysilane into the mixture B obtained in the step (2), stirring uniformly, heating to 75 ℃, reacting at constant temperature for 2.5h, placing into ultrasonic waves, vibrating for 4min, cooling to room temperature, performing suction filtration under the condition that a vacuum gauge shows-0.1 Mpa, placing into a 50 ℃ oven, drying, grinding, and sieving by 150 meshes to obtain the modified nano silicon dioxide.
Preparation example 6
The preparation of the modified nano silicon dioxide comprises the following steps:
step 1: weighing 80Kg of nano silicon dioxide prepared in preparation example 3 and 100Kg of propylene glycol, uniformly mixing, putting into ultrasonic waves, and vibrating for 5min to enable the nano silicon dioxide to be fully dispersed in the propylene glycol to obtain suspension A;
step 2: weighing 5Kg of vinyl triethoxysilane, adding the vinyl triethoxysilane and the suspension A obtained in the step 1 into a four-necked flask with a reflux condenser pipe of 500mL, placing the flask into a magnetic heating stirrer, uniformly stirring, heating to 55 ℃, and reversing for 3 hours to obtain a mixture B;
step 3: 3Kg of 3-aminopropyl triethoxysilane is weighed, added into the mixture B obtained in the step 2, stirred uniformly, heated to 70 ℃, reacted for 2 hours at constant temperature, placed into ultrasonic waves to oscillate for 3 minutes, cooled to room temperature, subjected to suction filtration under the condition that a vacuum gauge shows-0.1 Mpa, placed into a baking oven at 50 ℃ to be dried, ground and sieved for 100 meshes, and the modified nano silicon dioxide is obtained.
Preparation example 7
The preparation of the modified nano silicon dioxide comprises the following steps:
step 1: weighing 100Kg of commercially available nano silicon dioxide and 150Kg of propylene glycol, uniformly mixing, putting into ultrasonic waves, and vibrating for 8min to enable the nano silicon dioxide to be fully dispersed in the propylene glycol to obtain a suspension A;
step 2: weighing 6Kg of vinyl triethoxysilane, adding the vinyl triethoxysilane and the suspension A obtained in the step 1 into a four-necked flask with a reflux condenser pipe of 500mL, placing the flask into a magnetic heating stirrer, uniformly stirring, heating to 60 ℃, and reacting for 4 hours to obtain a mixture B;
step 3: and (2) weighing 4Kg of 3-aminopropyl triethoxysilane, adding the 3-aminopropyl triethoxysilane into the mixture B obtained in the step (2), stirring uniformly, heating to 75 ℃, reacting at constant temperature for 2.5h, placing into ultrasonic waves, vibrating for 4min, cooling to room temperature, performing suction filtration under the condition that a vacuum gauge shows-0.1 Mpa, placing into a 50 ℃ oven, drying, grinding, and sieving by 150 meshes to obtain the modified nano silicon dioxide.
Examples
Example 1
The preparation of the flame-retardant environment-friendly PC-ABS composite plastic master batch comprises the following steps:
s1: weighing 6Kg of modified nano silicon dioxide, 1.2 Kg of polysiloxane, 3Kg of tributyl acetylcitrate, 0.6 Kg of dioctyl phthalate, 0.5Kg of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, 0.5Kg of 4,4' -thiobis (6-tert-butyl-3-methylphenol), 0.5Kg of talcum powder, 0.8Kg of kaolin and 0.8Kg of carbon fiber, putting into a high-speed mixer, mixing for 3 minutes at normal temperature, uniformly mixing the raw materials, taking out from the high-speed mixer, and obtaining a mixture A for standby;
s2: weighing 60Kg of PC resin and 15Kg of ABS resin, putting into a high-speed mixer, mixing for 1min at normal temperature, uniformly mixing the PC resin and the ABS resin, adding the mixture A obtained in the step S1, mixing for 5min, putting into an extruding agent for extrusion, putting into a granulator for granulating, and finally putting into a 50 ℃ oven for drying to obtain the PC-ABS composite plastic master batch.
Examples 2 to 8
Examples 2-8 differ from example 1 above in the type and amount of materials, see in particular Table 2 below;
TABLE 2 content of the respective raw materials of examples 1 to 8
Comparative example
Comparative example 1
Comparative example 1 differs from example 4 in that the polysiloxane and modified nanosilica in the starting materials were replaced with decabromodiphenylethane in equal amounts.
Comparative example 2
Comparative example 2 differs from example 5 in that the modified nano-silica in the raw material was replaced with polysiloxane in equal amount.
Performance test
1. Tensile Strength
Detection is carried out according to the test standard ISO 527-2;
2. impact Strength
Detection was performed according to test standard ISO 179-1993;
3. melt index
Detection is performed according to the test standard ASTMD 1238;
4. oxygen index
Testing according to the national standard GBT 24093;
5. flame retardant rating
Detecting according to the national standard ANSI/UL-94-1985;
the results of the performance test of the silica gel-like thermoplastic resins of examples 1-8 and comparative examples 1-2 are shown in Table 3:
TABLE 3 test data for examples 1-8 and comparative examples 1-2
It can be seen from the combination of example 4 and comparative example 1 and the combination of table 3 that the oxygen index in example 4 is better than that in comparative example 1, and further that the effect of the polysiloxane and the modified nano-silica used as flame retardant auxiliary in example 4 is better than that of the decabromodiphenyl ethane used as flame retardant auxiliary in comparative example 1, so that the flame retardant environment-friendly PC-ABS composite plastic master batch obtains better flame retardant performance.
As can be seen from the combination of example 5 and table 2, the tensile strength, oxygen index, impact property and melt index in example 4 are all better than those in comparative example 1, and further, the use of polysiloxane and modified nano silica in example 4 is better than that of comparative example 1 alone, so that the flame retardant and environment-friendly PC-ABS composite plastic master batch obtains better flame retardance, toughness and high temperature resistance.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (3)
1. The flame-retardant environment-friendly PC-ABS composite plastic master batch is characterized by being prepared from the following raw materials in parts by weight:
55-65 parts of PC resin
ABS resin: 10-20 parts
Flame retardant auxiliary: 5-10 parts
Filler: 2-3 parts
And (3) a plasticizer: 3-5 parts
Anti-aging agent: 0.5-1 part;
the flame retardant auxiliary is obtained by mixing polysiloxane and modified nano silicon dioxide in a weight ratio of 1:3-8;
the preparation of the modified nano silicon dioxide comprises the following steps:
step 1: weighing 80-120 parts by weight of nano silicon dioxide and 150-200 parts by weight of propylene glycol, uniformly mixing, and oscillating for 5-10min to obtain a suspension A;
step 2: weighing 5-8 parts by weight of vinyltriethoxysilane, adding into the suspension A obtained in the step 1, uniformly stirring, heating to 55-65 ℃, and reacting for 3-5 hours to obtain a mixture B;
step 3: weighing 3-5 parts by weight of 3-aminopropyl triethoxysilane, adding into the mixture B obtained in the step 2, stirring uniformly, heating to 70-80 ℃, reacting at constant temperature for 2-3 hours, oscillating for 3-5 minutes, cooling to room temperature, filtering, drying, grinding, and sieving with 100-200 meshes to obtain modified nano silicon dioxide;
the preparation of the nano silicon dioxide comprises the following steps:
step A: weighing 0.5-1 part of sodium persulfate and 1-2 parts of polyethylene glycol according to parts by weight, stirring and dissolving in water to obtain a mixture I for later use; weighing 65-80 parts of concentrated sulfuric acid with the mass fraction of 90-95% and 3-5 parts of hydrogen peroxide, and uniformly mixing to obtain a mixture II for later use; weighing 3-5 parts of sodium carbonate, and dissolving in 100-200 parts of sodium hydroxide solution with mass fraction of 5-10% to obtain a mixture III;
and (B) step (B): weighing 50-60 parts of sodium silicate and 1-3 parts of sodium sulfate according to parts by weight, dissolving in water, dropwise adding the mixture II obtained in the step A, and uniformly stirring to obtain a mixture IV;
step C: adding the mixture I into the mixture IV obtained in the step B, reacting for 65-80min, adding filter residues after suction filtration into the mixture III obtained in the step A, uniformly stirring, standing for 2-3min, washing with water, suction filtration, drying, calcining, grinding, and sieving for 100-200 meshes to obtain nano silicon dioxide;
the filler is one or a combination of a plurality of kaolin, talcum powder and carbon fiber;
the mesh numbers of the kaolin and the talcum powder are 100-200 meshes;
the plasticizer is a mixture of acetyl tributyl citrate and dioctyl phthalate;
the acetyl tributyl citrate and the dioctyl phthalate are mixed according to the weight ratio of 1:0.1-0.3.
2. The flame-retardant and environment-friendly PC-ABS composite plastic master batch according to claim 1, which is characterized in that: the anti-aging agent is beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and/or 4,4' -thiobis (6-tert-butyl-3-methylphenol).
3. A method for preparing the flame-retardant environment-friendly PC-ABS composite plastic master batch according to claim 1 or 2, which is characterized by comprising the following steps:
s1: weighing 5-10 parts of flame retardant auxiliary, 2-3 parts of filler, 3-5 parts of plasticizer and 0.5-1 part of anti-aging agent according to parts by weight, and uniformly mixing to obtain a mixture A;
s2: weighing 55-65 parts of PC resin and 10-20 parts of ABS resin according to parts by weight, uniformly mixing, adding the mixture A obtained by S1, mixing for 3-5 minutes, extruding, granulating and drying to obtain the PC-ABS composite plastic master batch.
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