CN112745642B - Low-mold-fouling flame-retardant reinforced PBT (polybutylene terephthalate) composite material as well as preparation method and application thereof - Google Patents
Low-mold-fouling flame-retardant reinforced PBT (polybutylene terephthalate) composite material as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a low-mold-fouling flame-retardant reinforced PBT (polybutylene terephthalate) composite material as well as a preparation method and application thereof. The low-mold-fouling flame-retardant reinforced PBT composite material comprises the following components in parts by weight: 40-60 parts of PBT resin; 25-30 parts of alkali-free glass fiber; 8-15 parts of a brominated flame retardant; 2-5 parts of a flame-retardant synergist; 0.5-2 parts of hyperbranched polyester; 0.3-2 parts of ethylene-acrylic acid copolymer; 0-5 parts of a toughening agent; 0-1 part of processing aid. The invention obviously reduces the mold scale in the injection molding process of the flame-retardant reinforced PBT through the synergistic sharing of the ethylene-acrylic acid copolymer and the carboxyl-terminated dendritic hyperbranched polyester, better enhances the flame retardant property, the mechanical property and the low mold scale property of the PBT composite material through the synergistic sharing with other components, the flame retardant property of the composite material reaches the UL-94 standard 0.8mmV0 grade, the tensile strength can reach more than 125MPa, the injection mold scale is low, and the use requirements in the field of ultrathin electronic components in the electronic and electrical industry are met.
Description
Technical Field
The invention relates to the technical field of engineering plastics, and particularly relates to a low-mold-fouling flame-retardant reinforced PBT (polybutylene terephthalate) composite material as well as a preparation method and application thereof.
Background
Polybutylene terephthalate (PBT) is an increasingly widely used engineering plastic, and has comprehensive stable mechanical property and better hydrolysis resistance, the PBT has lower hygroscopicity than nylon and other materials, and has little influence on the stability of electrical dimensions, and the PBT has better chemical resistance, solvent and weather resistance, high crystallization speed, good fluidity, excellent forming performance, high dielectric strength, low friction coefficient, wear resistance and good bending creep property. At present, the flame-retardant reinforced PBT is one of the most widely industrialized PBT modified products, and compared with pure PBT, the introduction of the flame retardant and the glass fiber improves various physical properties and fatigue resistance of the PBT, and reduces the water absorption, creep and molding shrinkage of the material.
However, the following problems generally occur after the glass fiber and the flame retardant are introduced into the flame-retardant reinforced PBT: the material can generate more mold fouling in the injection molding process due to the introduction of the glass fiber and the flame retardant. In the aspect of materials, the generation reason of the mold fouling is that the content of small molecules in the materials is too high or the thermal stability of components in the materials is poor, the PBT has oligomer and small molecule residual rate of usually 1-3 wt%, compared with other resin materials, the mold fouling problem is more easily generated, particularly in a flame-retardant reinforced system, chain breakage is more easily caused after friction between resin and glass fiber, and the flame retardant promotes the flame retardant property by promoting resin degradation, so the mold fouling of the flame-retardant reinforced PBT is particularly obvious. For the ultra-thin parts (0.3-0.4mm) of relays and capacitors, the parts are very thin and need to be injected at high temperature and high speed, the self heating and shearing of the materials are obviously higher than those of other injection molding conditions, mold fouling is particularly obvious, so that the surface of a mold needs to be cleaned regularly in the continuous processing process, the production efficiency is low, and the problems of white spots and the like appear on the surfaces of the parts even in a serious state, thereby seriously affecting the appearance of the products.
In the prior art, a technology for reducing mold fouling of flame-retardant reinforced PBT is rarely reported, and CN103232685A discloses a high-content glass fiber reinforced material with low mold fouling and excellent surface quality and a preparation method thereof, wherein single-reinforced PBT with low mold fouling is obtained by placing glass fibers at a constant temperature of 500 ℃ for 3-5 h, the mold fouling is reduced mainly by treating the glass fibers, and a compound of the glass fibers and the glass fibers for eliminating surface functional groups or micromolecule treating agents is adopted, but the glass fiber treatment has great operation difficulty in the actual production process and is not beneficial to industrial production. CN107266877A discloses a low-odor reinforced flame-retardant PBT material, a flame-retardant reinforced PBT product with low mold fouling is obtained by using PBT prepared by a PTA method, and with the continuous maturity of the technology of the PTA method, almost all PBT in the market at present adopts the PTA method, but the requirements of customers on the mold fouling cannot be met, and the technical requirement of the low mold fouling is further improved.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the obvious defect and defect of mold fouling of the conventional flame-retardant reinforced PBT material and provides a low-mold-fouling flame-retardant reinforced PBT composite material, wherein the PBT composite material has the advantages of low mold fouling, high performance, good appearance and good fluidity.
The invention also aims to provide a preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material.
The invention further aims to provide an application of the low-mold-fouling flame-retardant reinforced PBT composite material in the preparation of electronic components.
The above purpose of the invention is realized by the following technical scheme:
the low-mold-fouling flame-retardant reinforced PBT composite material comprises the following components in parts by weight
40-60 parts of PBT resin;
25-30 parts of alkali-free glass fiber;
8-15 parts of a brominated flame retardant;
2-5 parts of a flame-retardant synergist;
0.3-2 parts of carboxyl-terminated dendritic hyperbranched polyester;
0.1-2 parts of ethylene-acrylic acid copolymer;
0-5 parts of a toughening agent;
0-1 part of processing aid.
Among them, it should be noted that:
the carboxyl-terminated dendritic hyperbranched polyester is a series of modified polymers with hyperbranched polyester as a framework and a large number of active carboxyl groups at the tail end, and can be carboxyl-terminated hyperbranched polyester Hyper C100 of Wuhan hyperbranched resin technology Co.
In the flame-retardant reinforced PBT, the introduction of a flame retardant can enhance the flame-retardant performance but can also cause the increase of PBT mold scale, and in the low-mold-scale flame-retardant reinforced PBT composite material, the mold scale in the injection molding process of the flame-retardant reinforced PBT can be obviously reduced only when the ethylene-acrylic acid copolymer and the carboxyl-terminated dendritic hyperbranched polyester are used together.
The generation of the mold scale has two aspects, firstly, the resin and the surface of a screw rod and a screw cylinder of an extruder rub against each other, secondly, the resin and the glass fiber rub against each other continuously to cause the resin degradation, the carboxyl-terminated hyperbranched polyester can act with hydroxyl on the surface of the glass fiber to reduce the friction between the resin and the glass fiber, in addition, the ethylene-acrylic acid copolymer mainly plays a role in external lubrication to reduce the friction between the resin and the screw rod and the screw cylinder of the extruder, the degradation of the resin in the extrusion process can be obviously reduced when the carboxyl-terminated hyperbranched polyester and the resin are used together, the dosage of the ethylene-acrylic acid copolymer must be controlled to be 0.3-2 parts, and the dosage of the carboxyl-terminated hyperbranched polyester must be controlled to be 0.5-2 parts to have an obvious mold scale reduction effect.
The low-mold-fouling flame-retardant reinforced PBT composite material disclosed by the invention has the low-mold-fouling performance, the flame retardance of the low-mold-fouling flame-retardant reinforced PBT composite material has the UL-94 standard 0.8mmV0 grade, and the tensile strength of the low-mold-fouling flame-retardant reinforced PBT composite material can reach more than 125 MPa.
Preferably, the composition comprises the following components in parts by weight:
40-60 parts of PBT resin;
25-30 parts of alkali-free glass fiber;
8-15 parts of a brominated flame retardant;
2-5 parts of a flame-retardant synergist;
0.3-0.9 part of carboxyl-terminated dendritic hyperbranched polyester;
0.1-0.7 part of ethylene-acrylic acid copolymer;
0-5 parts of a toughening agent;
0-1 part of processing aid.
Preferably, the composition comprises the following components in parts by weight:
40-60 parts of PBT resin;
25-30 parts of alkali-free glass fiber;
8-15 parts of a brominated flame retardant;
2-5 parts of a flame-retardant synergist;
0.3-0.5 part of carboxyl-terminated dendritic hyperbranched polyester;
0.5-0.7 part of ethylene-acrylic acid copolymer;
0-5 parts of a toughening agent;
0-1 part of processing aid.
More preferably, the composition comprises the following components in parts by weight
50 parts of PBT resin;
10 parts of alkali-free glass fiber;
10 parts of a brominated flame retardant;
3 parts of a flame-retardant synergist;
0.5 part of carboxyl-terminated dendritic hyperbranched polyester;
0.5 part of ethylene-acrylic acid copolymer;
3 parts of a toughening agent;
0.5 part of processing aid.
Preferably, the PBT resin has an intrinsic viscosity of 0.7-1.3 dL/g (25 ℃).
Wherein the intrinsic viscosity of the PBT resin is detected by the method GB/T14190-2017.
The PBT resin with the viscosity range is beneficial to actual injection molding processing, and the stability of the injection molding process is not beneficial to the excessively low or high viscosity.
Preferably, the alkali-free glass fiber is an alkali-free glass fiber treated with a coupling agent. The alkali-free glass fiber is also called E glass fiber, and refers to glass fiber with low content of alkali metal oxide, wherein the specific content of the alkali metal oxide is not more than 0.5 percent in domestic regulations and is generally about 1 percent in foreign countries. Compared with the common glass fiber, the alkali-free glass fiber has high tensile strength and good electrical insulation, the interface strength and the performance of the glass fiber and resin can be effectively improved after the treatment of the coupling agent, and the coupling agent is mainly a silane coupling agent.
The length range of the alkali-free glass fiber is preferably 10-13 mu m, the glass fiber is too short to play a filling role and cannot play a reinforcing effect, and the glass fiber is too long to play a remarkable reinforcing effect, but the dispersibility, the forming processing performance and the product service performance of the glass fiber are influenced.
Preferably, the brominated flame retardant is one or more of brominated epoxy, brominated polystyrene, brominated polycarbonate and decabromodiphenylethane. The preferred flame retardant of the invention has the advantages of good thermal stability, high bromine content and no precipitation.
Preferably, the flame retardant synergist is an antimony-containing flame retardant, preferably antimony white or sodium antimonate.
The antimony white, the sodium antimonate and the bromine flame retardant have good synergistic flame retardant effect, good thermal stability and small influence on performance.
Preferably, the toughening agent is one or more of ethylene-acrylate-glycidyl methacrylate terpolymer, ethylene-acrylate binary copolymer, ethylene-vinyl acetate and glycidyl methacrylate grafted ethylene-octene copolymer.
Preferably, the acid value of the ethylene-acrylic acid copolymer is less than or equal to 50mgKOH/g3. The acid value represents the acrylic acid content, the acid value is too low, the compatibility with the resin is poor, the dispersibility is poor, the acid value is too high, the compatibility is too good, the resin enters the interior, and the good external lubricating effect cannot be achieved.
Wherein the acid value of the ethylene-acrylic acid copolymer of the present invention is measured by the KOH titration method in accordance with ASTM D1386-2015 standard.
Preferably, the other functional processing aids comprise a lubricant and an antioxidant, wherein the lubricant is one or more of aliphatic carboxylic ester, erucamide, ethylene bis stearamide, montmorillonite esters, polyethylene wax and oxidized polyethylene wax, and the antioxidant is a composite antioxidant system consisting of one or more of hindered phenol antioxidants, phosphite antioxidants and organic sulfur antioxidants.
The invention also specifically protects a preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material, which comprises the following steps:
s1, uniformly mixing the dried PBT resin, the brominated flame retardant, the flame-retardant synergist, the alkali-free glass fiber, the hyperbranched polyester, the ethylene-acrylic acid copolymer, the toughening agent and other functional processing aids to obtain a mixed material;
and S2, feeding the mixed material into a double-screw extruder to be fully melted and plasticized, kneading and mixing, extruding, bracing, cooling, granulating and drying to obtain the low-mold-fouling flame-retardant reinforced PBT composite material.
The drying treatment of the PBT resin in S1 may specifically be performed as follows: pre-drying for 4-6 hours at 120-140 ℃, and controlling the water content to be less than 0.03%.
In the step S1, the components can be uniformly mixed by a high-speed stirring mixer according to the proportion or independently enter a premixer through a metering feeder to be uniformly mixed to obtain a mixed material.
Preferably, the feeding speed of the double-screw extruder in S2 is 450-800 kg/h; the temperatures of the screw sections of the double-screw extruder from the charging port to the head are respectively 220-.
The mechanical property of the processing temperature in the range is optimal, the plasticizing is not good for dispersion when the temperature is too low, and the resin decomposition is not good for performance when the temperature is too high.
The application of the low-mold-fouling flame-retardant reinforced PBT composite material in the preparation of electronic components is also within the protection scope of the invention.
The electronic original device refers to an electronic component with high requirements (generally requiring 1-2 levels) on mold scale in the electronic and electrical industry, and can comprise a capacitor, a relay, a connector and the like.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a low-mold-fouling flame-retardant reinforced PBT composite material, which remarkably reduces mold fouling in the injection molding process of flame-retardant reinforced PBT through the synergistic sharing of an ethylene-acrylic acid copolymer and carboxyl-terminated dendritic hyperbranched polyester, better enhances the flame retardant property, the mechanical property and the low mold fouling property of the PBT composite material through the synergistic sharing of the ethylene-acrylic acid copolymer and other components, achieves the UL-94 standard 0.8mmV0 grade in flame retardant property, achieves the tensile strength of more than 125MPa, has low injection mold fouling, and meets the use requirements of the field of ultrathin electronic components in the electronic and electrical industry.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
Wherein, the sources of various raw materials of the invention are concretely illustrated as follows:
PBT resin: the specific resin grades are as follows: PBT 1200-211M, Taiwan Changchun, the intrinsic viscosity of the resin is 0.8 dl/g;
brominated flame retardants: selecting brominated epoxy F-2100 and Israel ICL respectively; decabromodiphenylethane SAYTEX 4010, brominated polystyrene SAYTEX 621, american jab; brominated polycarbonate FG8500, imperial japan;
synergistic flame retardant: antimony white S-05N, Chenzhou antimony industry; sodium antimonate SA-F;
a toughening agent: ethylene-acrylate-glycidyl methacrylate terpolymer, designation PTW (dupont); ethylene-methyl acrylate dipolymer, designation ELVALOY AC 1125 (dupont);
hyperbranched polyester: carboxyl-terminated hyperbranched resin Hyper C100, terminated hyperbranched polyester HBP-160, Wuhan hyperbranched resin science and technology Limited; hydroxyl-terminated hyperbranched polyester CYD-C600, Waishahi molecular New materials Co., Ltd;
ethylene-acrylic acid copolymer: A-C540A, acid value 40mgKOH/g3Houniville, usa; A-C5120, acid value 120mgKOH/g3Houniville, usa;
alkali-free glass fibers are respectively selected from: ECS13-4.5-534A (glass fiber diameter 13 μm, boulder group); ECS10-4.5-T436H (glass fiber diameter 10 μm, Mount Taishan fiberglass Co., Ltd.);
antioxidant: respectively selecting antioxidant (1010, 168, 412S, Rianlong);
lubricant: PETS-AP, Italian hair base.
Example 1
The low-mold-fouling flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 1.
The preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material comprises the following steps:
s1, drying the PBT resin at 130 ℃ for more than 3 hours, controlling the water content to be less than 0.03%, preparing various raw materials according to the proportion in Table 1, and uniformly mixing the dried bromine-containing flame retardant, the flame-retardant synergist, the toughening agent, the alkali-free glass fiber, the antioxidant and the lubricant in a high-speed stirring mixer or independently feeding the mixture into a premixer through a metering feeder; obtaining a premix;
s2, feeding the mixed material into a double-screw extruder, adjusting the feeding amount to be 450-800 kg/h, feeding the mixed material in the double-screw extruder in a side-feeding mode, adding alkali-free glass fiber in proportion, wherein the temperatures of all sections of screws of the double-screw extruder from a feeding port to a machine head are 230 ℃, 240 ℃, 250 ℃, 260 ℃, 240 ℃, 230 ℃ and 220 ℃, and the rotating speeds of the screws are 400rpm, and the mixed material is fully melted, plasticized, kneaded and mixed, extruded by the machine head, pulled into strips, cooled, granulated, dried and finally packaged under the conveying and shearing action of the double-screw extruder to obtain the low-mold-scale flame-retardant reinforced PBT composite material.
Example 2
The low-mold-fouling flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 1.
The preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material is the same as that of example 1.
Example 3
The low-mold-fouling flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 1.
The preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material is the same as that of example 1.
Example 4
The low-mold-fouling flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 1.
The preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material is the same as that of example 1.
TABLE 1 example Components
Comparative example 1
The flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 2.
Comparative example 2
The flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 2.
Comparative example 3
The flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 2.
Comparative example 4
The flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 2.
Comparative example 5
The flame-retardant reinforced PBT composite material comprises the raw material components in parts by weight shown in Table 2.
TABLE 2 comparative example Components
Result detection
(1) Mold scale rating
Evaluation method of mold scale:
using a Claus Murphy machine (model CX 160-: the material temperature is 280 ℃, the injection speed is medium and high, 300 molds are continuously injected, and the mold fouling amount is observed visually
Grading mold scale visually:
level 1: the mold scale is very little, the lower surface of the mold scale collecting part can be obviously seen through the mold scale, and the other parts of the mold have no mold scale;
and 2, stage: the mold scale is less, the lower surface of the mold scale collecting part is seen in a fuzzy way through the mold scale, and the other parts of the mold have no mold scale;
and 3, level: mold scale generally, the lower surface of the mold cannot be seen at the mold scale collecting position through the mold scale, and no mold scale exists at other positions of the mold;
4, level: the mold scale is more, the lower surface of the mold cannot be seen at the mold scale collecting position through the mold scale, and obvious mold scale exists at other positions of the mold.
(2) Other physical property parameter test
The specific method comprises the following steps:
drying a product obtained by extruding and dicing at 120-130 ℃ for 3-4 hours;
test specimens were prepared according to the corresponding standard injection molding, the tensile strength being tested according to ISO 527-.
The flame retardant grade detection method comprises the following steps:
standard strip test specimens were 125. + -.5 mm long, 13.0. + -.0.5 mm wide and 0.8. + -.0.15 mm thick using the flame standard of UL 94-2016. The sample can be cut, injected and the like, and the consistency of the density is ensured.
Two groups of 5 specimens were treated at 23 + -2 deg.C, 50 + -5% for a minimum of 48 hours. Two additional groups of 5 specimens were each pretreated by conditioning in an oven at 70+1 ℃ for 168 hours, then placed in a desiccator and allowed to cool at room temperature for at least 4 hours.
Clamping the upper end of the sample by 6mm, keeping the long axis of the sample vertical, keeping the distance between the lower end of the sample and the medical degreasing layer of the horizontal layer to be about 300mm, and tearing the degreasing layer to be 50 multiplied by 50min, wherein the maximum thickness of the degreasing layer is 6mm
Aligning the flame of the Bunsen burner to the center of the lower end of the sample, keeping the distance between the center of the top surface of the Bunsen burner and the lower end surface of the sample at 10 +/-1 mm, and keeping the distance at 10 +/-0.5S: the bunsen burner can be moved as necessary with the change of the length and position of the sample. If the specimen has melt or burning material dropping during the flame application, the Bunsen burner is inclined at an angle of 45 degrees at one side of the specimen width direction and retreats from the specimen downward enough to prevent the dropping material from entering the lamp tube, meanwhile, the distance between the remaining part of the specimen and the center of the top surface of the Bunsen burner is still 10 +/-1 mm, the linear melt is negligible, and after the flame is applied to the specimen for 10 +/-0.5S, the Bunsen burner is immediately retreated to a position at least 150mm away from the specimen with the progress of about 300 mm/S. While the flame combustion time T (unit is s) of the sample is measured by a timer
Record of experiment
a) Flaming combustion time after first flame application, t 1;
b) flaming combustion time after the second flame application, t 2;
c) flameless combustion time after second flame application, t 3;
d) the flameless combustion spreading clamp is used for clamping a sample with or without combustion;
e) whether the combustion drops ignite the absorbent cotton or not.
The specific test results are shown in Table 3.
TABLE 3 test results
As can be seen from the above examples and comparative example data, in comparative example 1, the relevant brominated epoxy flame retardant and the synergistic antimony trioxide flame retardant are not added, the mold fouling amount of the obtained PBT composite material is very low, the mold fouling rating can reach level 1, but the flame retardant rating of the material can not reach the relevant requirements, and a qualified product can not be obtained. The data of comparative example 2 show that after brominated epoxy serving as a brominated flame retardant and antimony trioxide serving as a synergistic flame retardant are added, the flame retardant performance of the flame-retardant PBT can reach V0 level, but due to the influence of the flame retardant, the mold fouling rating of the material is obviously reduced, more mold fouling reaches 4 level, and the balance between the flame retardant performance and the low mold fouling cannot be achieved by the conventional flame-retardant PBT material. The other comparative examples, such as the relevant detection results of the comparative examples 3-6, also show that the mold fouling in the injection molding process of the flame-retardant reinforced PBT can be obviously reduced only by simultaneously matching other components under the synergistic effect of the carboxyl-terminated dendritic hyperbranched polyester and the ethylene-acrylic acid copolymer, so that the low-mold-fouling flame-retardant reinforced PBT composite material is obtained, the injection mold fouling is very low when the flame retardance has the UL-94 standard 0.8mmV-0 grade, the use requirements in the field of ultrathin electronic components in the electronic and electrical industry can be met, and meanwhile, the tensile strength is over 125MPa, the high strength is realized, and the molding is easy.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The low-mold-fouling flame-retardant reinforced PBT composite material is characterized by comprising the following components in parts by weight:
40-60 parts of PBT resin;
25-30 parts of alkali-free glass fiber;
8-15 parts of a brominated flame retardant;
2-5 parts of a flame-retardant synergist;
0.3-2 parts of carboxyl-terminated dendritic hyperbranched polyester;
0.1-2 parts of ethylene-acrylic acid copolymer;
0-5 parts of a toughening agent;
0-1 part of processing aid.
2. The low-mold-fouling flame-retardant reinforced PBT composite material as claimed in claim 1, which comprises the following components in parts by weight:
40-60 parts of PBT resin;
25-30 parts of alkali-free glass fiber;
8-15 parts of a brominated flame retardant;
2-5 parts of a flame-retardant synergist;
0.3-0.9 part of carboxyl-terminated dendritic hyperbranched polyester;
0.1-0.7 part of ethylene-acrylic acid copolymer;
0-5 parts of a toughening agent;
0-1 part of processing aid.
3. The low-mold-fouling flame-retardant reinforced PBT composite material as claimed in claim 2, which comprises the following components in parts by weight:
40-60 parts of PBT resin;
25-30 parts of alkali-free glass fiber;
8-15 parts of a brominated flame retardant;
2-5 parts of a flame-retardant synergist;
0.3-0.5 part of carboxyl-terminated dendritic hyperbranched polyester;
0.5-0.7 part of ethylene-acrylic acid copolymer;
0-5 parts of a toughening agent;
0-1 part of processing aid.
4. The low mold fouling flame retardant reinforced PBT composite material of any one of claims 1 to 3, wherein the intrinsic viscosity of the PBT resin is 0.7 to 1.3 dL/g.
5. The low-mold-fouling flame-retardant reinforced PBT composite material of any one of claims 1 to 3, wherein the acid value of the ethylene-acrylic acid copolymer is less than or equal to 50mgKOH/g3。
6. The low-mold-fouling flame-retardant reinforced PBT composite material according to any one of claims 1 to 3, wherein the brominated flame retardant is one or more of brominated epoxy, brominated polystyrene, brominated polycarbonate and decabromodiphenylethane.
7. The low-mold-fouling flame-retardant reinforced PBT composite material according to any one of claims 1 to 3, wherein the alkali-free glass fiber is an alkali-free glass fiber treated by a coupling agent, and has a length ranging from 10 to 13 μm.
8. The preparation method of the low-mold-fouling flame-retardant reinforced PBT composite material according to any one of claims 1 to 7, characterized by comprising the following steps:
s1, uniformly mixing the dried PBT resin, the brominated flame retardant, the flame-retardant synergist, the alkali-free glass fiber, the carboxyl-terminated dendritic hyperbranched polyester, the ethylene-acrylic acid copolymer, the toughening agent and the processing aid to obtain a mixed material;
and S2, feeding the mixed material into a double-screw extruder, fully melting and plasticizing, kneading and mixing, extruding, bracing, cooling, granulating and drying to obtain the low-mold-scale flame-retardant reinforced PBT composite material.
9. The method according to claim 8, wherein the twin-screw extruder in S2 has a feed rate of 450 to 800 kg/hr; the temperatures of the screw sections of the double-screw extruder from the charging port to the head are respectively 220-.
10. The application of the low-mold-fouling flame-retardant reinforced PBT composite material as claimed in any one of claims 1 to 7 in the preparation of electronic components.
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| CN107266880A (en) * | 2017-07-24 | 2017-10-20 | 武汉顺威赛特工程塑料有限公司 | A kind of high flow enhuancement flame-retardant PBT material and preparation method thereof |
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| CN107266880A (en) * | 2017-07-24 | 2017-10-20 | 武汉顺威赛特工程塑料有限公司 | A kind of high flow enhuancement flame-retardant PBT material and preparation method thereof |
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