CN114656760A - High-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof - Google Patents
High-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof Download PDFInfo
- Publication number
- CN114656760A CN114656760A CN202210345439.2A CN202210345439A CN114656760A CN 114656760 A CN114656760 A CN 114656760A CN 202210345439 A CN202210345439 A CN 202210345439A CN 114656760 A CN114656760 A CN 114656760A
- Authority
- CN
- China
- Prior art keywords
- flame retardant
- parts
- flame
- glow
- composite material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention relates to the technical field of materials, in particular to a high-fluidity, high-glow-wire and flame-retardant reinforced PBT (polybutylene terephthalate) composite material and a preparation method thereof; which comprises the following components in parts by weight: PBT resin: 45-60 parts of a solvent; polyphosphazene flame retardant: 2-6 parts; brominated flame retardants: 10-15 parts; flame retardant synergist: 3-5 parts; glass fiber: 20-35 parts of a solvent; antioxidant: 0-1 part; lubricant: 0 to 1 part. Also discloses a preparation method of the composite material. The PBT composite material disclosed by the invention adopts the synergistic compatibility of the multiple flame retardants, realizes the flame retardant grade of the glow wire with the combustible temperature of more than 775 ℃ (0.8mm) and 0.8mmV0, has excellent fluidity, and meets the molding requirement of thin-wall products.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a high-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and a preparation method thereof.
Background
The flame-retardant reinforced PBT has excellent mechanical strength, processability and electrical property, and is widely applied to the fields of electronics and electrics, household appliances, automobiles and the like. With the increasing automation, intelligence and integration degree of electronic and electrical components, in order to avoid active ignition caused by overheating of products due to poor contact, overload and short circuit of the electronic and electrical components in the using process, the glow wire performance of the PBT composite material needs to be improved.
The Glow Wire Ignition Temperature (GWIT) requirement in the IEC60695 standard is also enforced, and the GWIT of plastic parts used by long-term unsupervised electric appliances is required to meet the temperature of more than or equal to 750 ℃, and the GWIT requirement of specific parts such as connectors, relay shells, breaker shells and the like reaches 850 ℃ or more along with the realization of more and more functions of electronic appliances. The GWIT of the conventional flame-retardant reinforced PBT is about 725 ℃, and the requirement cannot be met.
The higher the integration degree of electronic and electric components is, the smaller the products are, the thinner the wall thickness is, and one mould has more cavities, so that the material is required to have good flowing property, and the higher requirement is provided for the flowing property of the composite material at present.
Chinese patent application CN110003624A discloses a high-impact high-glow-wire flame-retardant reinforced PBT plastic and a preparation method thereof. The PBT resin comprises, by weight, 15-43% of a PBT resin; 4-10% of PET resin; MCA 4-10%; 5-7% of decabromodiphenylethane; 5-7% of brominated polystyrene; 0.5-3% of sodium antimonate; TPP 2-5%; EMA-gGMA 3-10%; EBA-g-GMA 3-10%; 0.3-1% of antioxidant; 0.3-1% of a lubricant; 18-25% of glass fiber. The addition amount of the flame retardant is large, and the mechanical strength is low.
Chinese patent CN101851405A discloses a preparation method of an environment-friendly flame-retardant reinforced PBT (polybutylene terephthalate) engineering plastic with high CTI (comparative tracking index) and high GWIT (glow wire ignition temperature) for unattended electric appliances, which comprises the following components in percentage by weight: PBT resin: 50-70%; compounding a flame retardant: 15-40%; a toughening agent: 2-8%; a char-forming agent: 1.5 to 3 percent. Wherein the compound flame retardant is prepared from three different types of flame retardants: a component A of a brominated flame retardant system (comprising a brominated flame retardant and a flame retardant synergist), a component B of a nitrogen flame retardant and a component C of a phosphorus flame retardant system; the adopted nitrogen flame retardant is easy to separate out, the flame retardant stability is damaged, and the surface effect of the product is influenced.
A degradable antibacterial flame-retardant wig fiber based on PLA (polylactic acid) and a preparation method thereof are disclosed in the patent No. CN202010734831.7, brominated epoxy resin, antimony trioxide, polyphosphoric Acid (APP) and Hexaphenoxycyclophosphazene (HPCP) are adopted as composite flame retardants, and the fiber has a very good flame-retardant effect.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the invention provides a high-flow, high-glow-wire flame-retardant reinforced PBT composite material;
correspondingly, the invention also provides a preparation method of the high-flow high-glowing filament flame-retardant reinforced PBT composite material.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the invention provides a high-flow high-glow-wire flame-retardant reinforced PBT composite material, which comprises the following components in parts by weight:
PBT resin: 45-60 parts of a solvent;
polyphosphazene flame retardant: 2-6 parts;
brominated flame retardants: 10-15 parts;
flame retardant synergist: 3-5 parts;
glass fiber: 20-35 parts of a solvent;
antioxidant: 0-1 part;
lubricant: 0-1 part.
The brominated flame retardant, the polyphosphazene flame retardant and the flame retardant synergist are applied to the PBT composite material in the content range, so that the PBT composite material can play a good synergistic effect of coordinating high glow, high fluidity and high mechanical property.
According to the invention, by utilizing the flame retardant mechanisms of different types of flame retardants, namely a brominated flame retardant and a nitrogen-phosphorus flame retardant, are selected, so that the rapid carbonization of the matrix resin PBT is accelerated in the combustion process of the flame-retardant reinforced PBT composite material, a porous compact heat-insulating carbon layer is generated, heat and oxygen are isolated, the condensed phase flame retardant effect is effectively exerted, and meanwhile, the gas-phase flame retardant mechanism, namely the nitrogen-phosphorus flame retardant can release inert gases such as nitrogen and the like during combustion, is utilized, so that the oxygen concentration around the composite material is reduced. The rapid charring and inert gas environment not only realizes the high-efficiency flame retardance of the composite material, but also realizes the effect of high glow with GWIT more than or equal to 750 ℃.
Optionally, the brominated flame retardant comprises a brominated epoxy resin.
The bromine flame retardant is preferably 8500-30000 molecular weight, 51-54% bromine mass, and EP brominated epoxy resin. More preferably, EP-type brominated epoxy resin having a molecular weight of 9500-12000 and a bromine content of 52% is used. The brominated epoxy resin has good compatibility with PBT resin, excellent weather resistance and positive contribution to the fluidity.
Optionally, the polyphosphazene flame retardant comprises the structure:
n is an integer of 3-25, and R1 and R2 represent unsubstituted phenyl or at least one alkyl group with 1-6 carbon atoms or allyl substituted phenyl. The phosphazene flame retardant is a six-membered ring compound containing 13% of phosphorus elements and 6% of nitrogen elements which are alternately arranged, and due to a P-N structure in a molecule, resin carbonization is promoted to form a flame-retardant carbon layer, and inert gas is decomposed, so that condensed phase and gas phase flame retardant effects are exerted by the phosphazene flame retardant and the resin; the melting point of the phosphazene flame retardant is 110 ℃ lower than that of PBT, and the melt flow property of the composite material can be improved.
Optionally, the polyphosphazene flame retardant is hexaphenoxycyclophosphazene.
Optionally, the flame retardant synergist comprises antimony trioxide.
Optionally, the processing agent also comprises a processing aid which comprises a lubricant or/and a pigment,
the composite antioxidant system comprises hindered phenol antioxidants or/and phosphite antioxidants;
the lubricant comprises an aliphatic carboxylic ester lubricant or/and a polyolefin-based lubricant.
In a second aspect, the invention also provides a preparation method of the high-flow high-glow-wire flame-retardant reinforced PBT composite material, which comprises the following steps:
s1, drying the PBT resin for 4-6 hours at 120-140 ℃;
s2, uniformly stirring and mixing the dried polyester resin, the polyphosphazene flame retardant, the brominated flame retardant, the flame-retardant synergist, the antioxidant and the lubricant to obtain a premix;
s3, feeding the premix into a double-screw extruder, adding glass fiber into a side feed opening in the double-screw extruder, and performing extrusion, bracing, cooling, granulating, drying and packaging to obtain the high-fluidity high-glowing filament flame-retardant reinforced PBT composite material.
Optionally, the feeding amount of the double-screw extruder is 450-800 kg/h; the temperature of each section of screw of the double-screw extruder from a feed inlet to a nose is 220-230 ℃, 230-240 ℃, 240-250 ℃, 250-260 ℃, 240-250 ℃, 230-240 ℃ and 230-240 ℃, and the screw rotating speed of the double-screw extruder is 250-400 rpm.
(III) advantageous effects
The invention has the beneficial effects that: according to the invention, through the synergistic compatibility of the polyphosphazene flame retardant, the brominated flame retardant and the flame retardant synergist, the prepared PBT composite material realizes the flame retardant rating of the glow wire with the combustible temperature of more than or equal to 775 ℃ (0.8mm) and 0.8mmV0, has excellent flow property, and meets the molding requirement of thin-wall products.
Drawings
FIG. 1 is a structural diagram of a polyphosphazene flame retardant of the present invention.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof. In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below. While the following shows exemplary embodiments of the invention, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The raw materials in the examples of the present invention and the comparative examples were respectively selected from:
PBT resin: the intrinsic viscosity is 0.83 +/-0.02 dl/g, and the content of terminal carboxyl is less than or equal to 50 meq/kg;
first brominated epoxy flame retardant: molecular weight 9500-12000, bromine content 51-52%, EP type;
second brominated epoxy flame retardant: molecular weight of 17000-21000, bromine content of 52-53%, EP type;
polyphosphazene flame retardant: hexaphenoxycyclotriphosphazene, phosphorus content 13%, nitrogen content 6%, melting point 110 ℃, and the structure thereof is shown in figure 1;
nitrogen flame retardant, melamine cyanurate, nitrogen content 49%;
phosphorus flame retardant, triphenyl phosphate, phosphorus content 9.5%;
flame retardant synergist: sb2O3The content is 99.9%;
anti-dripping agent: PTFE content of 70 percent, PS surface coating;
glass fiber: alkali-free glass fiber with monofilament diameter of 13um, and performing surface treatment by using a silane coupling agent;
a first antioxidant: pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], mp 110-125;
a second antioxidant: tris (2, 4-di-tert-butylphenyl) phosphite, melting point 180-;
lubricant: pentaerythritol stearate with an acid value of less than 2 and a melting point of 60-65.
The high-fluidity high-glowing filament flame-retardant reinforced PBT composite material is prepared from the following raw materials in parts by weight in Table 1 or Table 2:
TABLE 1
TABLE 2
The specific preparation method of each example and comparative example is as follows:
s1, drying the PBT resin at 130 ℃ for 4-6 hours, and controlling the water content to be less than 0.03%;
s2, uniformly stirring and mixing the dried PBT resin with the polyphosphazene flame retardant, the first brominated epoxy flame retardant, the second brominated epoxy flame retardant, the phosphorus flame retardant, the nitrogen flame retardant, the flame retardant synergist, the first antioxidant, the second antioxidant, the lubricant and the anti-dripping agent to obtain a premix;
s3, feeding the premix into a double-screw extruder, adding glass fiber into a side feed opening of the double-screw extruder, wherein the temperatures of screw sections of the double-screw extruder from a feed opening to a machine head are 230 ℃, 240 ℃, 250 ℃, 260 ℃, 250 ℃, 240 ℃, 230 ℃ and 230 ℃ respectively; and the rotating speed of the screw is 250-400 rpm, and the PBT composite material is obtained by fully melting, plasticizing, kneading and mixing, extruding through a machine head, bracing, cooling, granulating and drying under the conveying and shearing action of a double-screw extruder.
The composite materials obtained in examples 1 to 3 and comparative examples 1 to 6 were tested for their properties by the following methods:
(1) drying the product obtained by extrusion and granulation at the temperature of 120-130 ℃ for 3-4 hours;
(2) preparing a test sample wafer according to corresponding standard injection molding;
(3) the tensile strength is tested according to the standard of ASTM D638, the notched impact strength of the cantilever beam is tested according to the standard of ASTM D256, the melt index is tested according to the standard of ASTM D1238, the flame retardant performance is tested according to the standard of UL94, and the GWIT is tested according to the standard of IEC 60695.
The results of the composite property tests obtained in the examples are shown in tables 3 and 4:
TABLE 3
| Test items | Example 1 | Example 2 | Example 3 |
| Finger melting, g/10min | 22 | 25 | 30 |
| GWIT，0.8MM | 775 | 800 | 825 |
| Flame retardant rating, 0.8MM | V0 | V0 | V0 |
| Tensile strength MPa | 125 | 115 | 105 |
| Notched impact strength of cantilever beam j/m | 100 | 90 | 85 |
TABLE 4
The comparison of the performance data of tables 3 and 4 can be used to obtain: in the embodiments 1, 2 and 3, the GWIT is larger than 775 ℃, the flame retardant rating of 0.8mmV0 and the excellent flow property are achieved by compounding the multi-element flame retardant, and the molding requirement of thin-wall products is met.
In comparative examples 1 and 2, the polyphosphazene flame retardant was not added, the GWIT was 725 ℃ and the flow property was low. In comparative example 3, the nitrogen-containing MCA flame retardant was added, the GWIT was 725 ℃ and the flow property was low. In comparative example 4, the flow property was slightly improved by adding a phosphorus element-containing TPP flame retardant with a GWIT of 725 ℃. In comparative example 5, the addition of the nitrogen element-containing MCA flame retardant and the phosphorus element-containing TPP flame retardant had a GWIT of 750 ℃ but could not satisfy 775 degrees. In comparative example 6, the polyphosphazene flame retardant was added completely, the brominated epoxy resin flame retardant was not added, the GWIT was 725 ℃, the flame retardant rating was HB, and the flow properties were greatly improved. In comparative example 7, no flame retardant was added, the GWIT was 725 ℃, the flame retardant rating was HB, and the flow properties were greatly reduced.
In conclusion, the data show that the polyester composite material which has high GWIT and V0 flame retardant grades, high flowing property and high mechanical strength and meets the strength requirement of electronic and electrical structural parts can be obtained through the combined action of the brominated flame retardant, the nitrogen and phosphorus element-containing polyphosphazene flame retardant and the flame retardant synergist in a proper proportion.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The high-fluidity high-glow-wire flame-retardant reinforced PBT composite material is characterized by comprising the following components in parts by weight:
PBT resin: 45-60 parts of a stabilizer;
polyphosphazene flame retardant: 2-6 parts;
brominated flame retardants: 10-15 parts;
flame retardant synergist: 3-5 parts;
glass fiber: 20-35 parts of a solvent;
antioxidant: 0-1 part;
lubricant: 0 to 1 part.
2. The high flow, high glow wire flame retardant reinforced PBT composite of claim 1, wherein: the brominated flame retardant comprises brominated epoxy resin.
3. The high flow, high glow wire flame retardant reinforced PBT composite of claim 1, wherein: the molecular weight of the bromine flame retardant is 8500-30000, and the mass content of bromine is 51-54%.
4. The high flow high glow wire light-off temperature PBT composite of claim 1 wherein the polyphosphazene flame retardant comprises the structure:
n is an integer of 3-25, and R1 and R2 represent unsubstituted phenyl or at least one alkyl group with 1-6 carbon atoms or allyl substituted phenyl.
5. The high flow high glow wire light-off temperature PBT composite of claim 1 wherein: the polyphosphazene flame retardant is hexaphenoxyl cyclophosphazene.
6. The high flow high glow wire light-off temperature PBT composite of claim 1 wherein the flame retardant synergist comprises antimony trioxide.
7. The high flow high glow wire light-off temperature PBT composite of claim 1, further comprising a processing aid comprising a lubricant or/and a pigment,
the compound antioxidant system comprises hindered phenol antioxidant or/and phosphite antioxidant;
the lubricant comprises an aliphatic carboxylic ester lubricant or/and a polyolefin-based lubricant.
8. The process for preparing a high flow, high glow wire flame retardant reinforced PBT composite as claimed in any of claims 1 to 7, comprising the steps of:
s1, drying the PBT resin at 120-140 ℃ for 4-6 hours;
s2, uniformly stirring and mixing the dried polyester resin, the polyphosphazene flame retardant, the brominated flame retardant, the flame-retardant synergist, the antioxidant and the lubricant to obtain a premix;
s3, feeding the premix into a double-screw extruder, adding glass fiber into a side feed opening in the double-screw extruder, and performing extrusion, bracing, cooling, granulating, drying and packaging to obtain the high-fluidity high-glow-wire flame-retardant reinforced PBT composite material.
9. The method for preparing a polyester material with high glowing filament ignition temperature resistance as claimed in claim 8, wherein the feed of the twin-screw extruder is 450-800 kg/hr; the temperature of each section of screw of the double-screw extruder from a feed inlet to a nose is 220-230 ℃, 230-240 ℃, 240-250 ℃, 250-260 ℃, 240-250 ℃, 230-240 ℃ and 230-240 ℃, and the screw rotating speed of the double-screw extruder is 250-400 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210345439.2A CN114656760A (en) | 2022-03-31 | 2022-03-31 | High-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210345439.2A CN114656760A (en) | 2022-03-31 | 2022-03-31 | High-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114656760A true CN114656760A (en) | 2022-06-24 |
Family
ID=82034062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210345439.2A Pending CN114656760A (en) | 2022-03-31 | 2022-03-31 | High-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114656760A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127048A (en) * | 2009-12-21 | 2011-06-30 | Mitsubishi Engineering Plastics Corp | Flame-retardant polybutylene terephthalate resin composition |
| CN104140559A (en) * | 2013-05-10 | 2014-11-12 | 信汇科技有限公司 | Application of cyclophosphazene compound in preparation of resin as fire retardant |
| WO2016099179A1 (en) * | 2014-12-19 | 2016-06-23 | 에스케이케미칼주식회사 | Polymer resin composition with excellent flame retardancy |
| CN109836817A (en) * | 2019-01-28 | 2019-06-04 | 杭州本松新材料技术股份有限公司 | Halogen flame and its application |
| CN111286165A (en) * | 2020-02-29 | 2020-06-16 | 贵州民族大学 | Phosphaphenanthrene and polyphosphazene double-base synergistic flame-retardant PBT (polybutylene terephthalate) composite material as well as preparation method and application thereof |
-
2022
- 2022-03-31 CN CN202210345439.2A patent/CN114656760A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127048A (en) * | 2009-12-21 | 2011-06-30 | Mitsubishi Engineering Plastics Corp | Flame-retardant polybutylene terephthalate resin composition |
| CN104140559A (en) * | 2013-05-10 | 2014-11-12 | 信汇科技有限公司 | Application of cyclophosphazene compound in preparation of resin as fire retardant |
| WO2016099179A1 (en) * | 2014-12-19 | 2016-06-23 | 에스케이케미칼주식회사 | Polymer resin composition with excellent flame retardancy |
| CN109836817A (en) * | 2019-01-28 | 2019-06-04 | 杭州本松新材料技术股份有限公司 | Halogen flame and its application |
| CN111286165A (en) * | 2020-02-29 | 2020-06-16 | 贵州民族大学 | Phosphaphenanthrene and polyphosphazene double-base synergistic flame-retardant PBT (polybutylene terephthalate) composite material as well as preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101230083B1 (en) | Flame-retardant polyester composition | |
| KR100999433B1 (en) | A composition having superior flame retarding property and an article prepared therefrom | |
| US7435769B2 (en) | Flame resistant synthetic resin composition | |
| CN101280098B (en) | Halogen-free flame-proof strengthened polyethylene glycol terephthalate engineering plastics and preparation thereof | |
| CN100590146C (en) | Preparation of halogen-free flame-proof nylon 66 having high-mechanical property and composite material | |
| CN108624006B (en) | High-fluidity glass fiber reinforced flame-retardant PC/PBT alloy material and preparation method thereof | |
| CN101857712B (en) | Halogen-free flame-retardant ABS/PET alloy and preparation method thereof | |
| CN107903608A (en) | A kind of halogen-free flame-resistant high-temperature-resistant Polyphenyl ether alloy material and preparation method thereof | |
| CN101845205A (en) | Halogen-free fire-resistant engineering plastics using waste PET bottle chips as raw material and preparation method thereof | |
| CN101613480A (en) | A kind of preparation method who strengthens the polybutylene terephthalate flame-retardant heat conduction material | |
| CN104893223B (en) | Sheathing material of a kind of electronic equipment and preparation method thereof | |
| EP0462378A2 (en) | Polyethylene terephthalate composition | |
| CN112322020A (en) | Polyphenyl ether resin composition and preparation method thereof, and wire slot and preparation method thereof | |
| KR101748243B1 (en) | Halogen-free flame-retardant polyester resin composition having high fluidity and surface gloss and molded article thereof | |
| CN114656760A (en) | High-fluidity high-glow-wire flame-retardant reinforced PBT (polybutylene terephthalate) composite material and preparation method thereof | |
| CN115710426A (en) | High CTI (comparative tracking index) high GWIT (glow wire ignition temperature) flame-retardant reinforced PA6/PPO (polyamide oxide/polyphenylene oxide) material | |
| CN115873401A (en) | Carbon fiber reinforced polyamide composition, preparation method and application | |
| CN116285328A (en) | High-strength low-precipitation halogen-free flame-retardant polyamide composition and preparation method thereof | |
| CN102070886A (en) | PBT (polybutylene terephthalate)/PC (polycarbonate) alloy material with high CTI (comparative tracking index) value and high flame retardance and preparation method thereof | |
| CN114806110B (en) | Low-smoke, high-GWIT and high-CTI flame-retardant reinforced material and preparation method thereof | |
| JPS638453A (en) | Thermoplastic polyester resin composition | |
| CN116444973B (en) | Flame-retardant polycarbonate material and preparation method and application thereof | |
| CN115322565B (en) | High-modulus low-water-absorption flame-retardant PA66 composite material and preparation method thereof | |
| CN114163783B (en) | Low-warpage high-CTI halogen-free flame-retardant reinforced PBT material and preparation method thereof | |
| CN117430929A (en) | Polybutylene terephthalate composition and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |