CN111100451A - Modified liquid crystal polyester resin composite material and preparation method thereof - Google Patents
Modified liquid crystal polyester resin composite material and preparation method thereof Download PDFInfo
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- CN111100451A CN111100451A CN201911352558.5A CN201911352558A CN111100451A CN 111100451 A CN111100451 A CN 111100451A CN 201911352558 A CN201911352558 A CN 201911352558A CN 111100451 A CN111100451 A CN 111100451A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a modified liquid crystal polyester resin composite material and a preparation method thereof. The modified liquid crystal polyester resin composite material is prepared from 5-20 parts by weight of liquid crystal polyester resin, 30-80 parts by weight of aliphatic polymer, 0.5-5 parts by weight of ethylene copolymer elastomer and 15-30 parts by weight of filler. According to the invention, the ethylene copolymer elastomer is added into the liquid crystal polyester resin and the aliphatic polymer, so that the compatibility of the liquid crystal polyester resin and the aliphatic polymer can be improved, and the obtained modified liquid crystal polyester resin composite material has good mechanical property and thermal stability.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a modified liquid crystal polyester resin composite material and a preparation method thereof.
Background
Liquid Crystal Polymer (LCP) is a novel high-performance special engineering plastic. In recent years, with the rapid development of photoelectric, aerospace, national defense and mobile communication in the fields of high-frequency transmission and the like, the demand for high-performance engineering plastics is greatly increased, and LCP is one of the main development materials due to the characteristics of low hygroscopicity, high chemical resistance, high gas barrier property, low dielectric constant and the like.
However, LCP is an aromatic liquid crystal polymer and has unique liquid crystal characteristics, and the molecular arrangement of LCP is highly ordered when it is processed and molded, and it is difficult to mix with other materials. In addition, according to the principle of similarity and compatibility, aromatic compounds are easily fused with structural similarity aromatic compounds, but are hardly fused with aliphatic compounds. For the reasons, LCP and aliphatic resin show higher inertia when being blended and modified, and have the problems of low bonding strength, poor stability and the like.
Disclosure of Invention
The invention aims to provide a modified liquid crystal polyester resin composite material, which aims to solve the problem of poor compatibility of the existing liquid crystal polyester resin and aliphatic polymers.
The invention also aims to provide a preparation method of the modified liquid crystal polyester resin composite material.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a modified liquid crystal polyester resin composite material is prepared from the following raw materials in parts by weight:
in a preferred embodiment of the present invention, the liquid crystal polyester resin is a wholly aromatic liquid crystal polyester resin.
In a preferred embodiment of the present invention, the wholly aromatic liquid crystalline polyester resin comprises at least one of the following repeating units:
repeating units of aromatic diol: -O-Ar-O-),
Repeating units of aromatic diamine: -HN-Ar-NH-),
Repeating unit of aromatic hydroxylamine: -HN-Ar-O-),
Repeating units of aromatic dicarboxylic acid: -OC-Ar-CO-),
Repeating units of aromatic hydroxycarboxylic acid: -O-Ar-CO-),
Repeating units of aromatic aminocarboxylic acid: -HN-Ar-CO-;
wherein Ar is at least one selected from the group consisting of phenylene, biphenylene, naphthalene, and an aromatic compound in which two phenylenes are bonded to each other, and an aromatic compound in which at least one hydrogen of the phenylene, biphenylene, naphthalene, and aromatic compound in which two phenylenes are bonded to each other is substituted.
In a preferred embodiment of the present invention, the aliphatic polymer is polyamide.
In a preferred embodiment of the present invention, the filler is at least one selected from glass fiber, whisker, wollastonite, talc, titanium dioxide, carbon black, calcium carbonate, clay, barium sulfate, and silica.
The invention also provides a preparation method of the wholly aromatic liquid crystal polyester resin, which comprises the following steps:
selecting at least two monomers to carry out polycondensation reaction to synthesize a wholly aromatic liquid crystal polyester prepolymer;
carrying out solid-phase polycondensation on the wholly aromatic liquid crystal polyester prepolymer to obtain wholly aromatic liquid crystal polyester resin;
wherein the monomer is selected from at least one of aromatic diol, aromatic diamine and aromatic hydroxylamine, and at least one of aromatic dicarboxylic acid, aromatic hydroxycarboxylic acid and aromatic aminocarboxylic acid.
As a preferred technical solution of the present invention, the polycondensation reaction is a solution polycondensation reaction or a bulk polycondensation reaction.
In a preferred embodiment of the present invention, the monomer is pretreated with an acylating agent before the polycondensation reaction.
In a preferred embodiment of the present invention, the solid phase polycondensation is performed under an inert atmosphere or under vacuum.
The invention also provides a preparation method of the modified liquid crystal polyester resin composite material, which comprises the following steps:
providing liquid crystal polyester resin, aliphatic polymer, ethylene copolymer elastomer and filler according to the raw material formula of the modified liquid crystal polyester resin composite material;
and drying the liquid crystal polyester resin, the aliphatic polymer, the ethylene copolymer elastomer and the filler, mixing, melting, mixing, extruding, bracing, cooling and granulating to obtain the modified liquid crystal polyester resin composite material.
The liquid crystal polyester resin has poor compatibility with aliphatic polymers, and the two have the problems of high inertia and low bonding strength during blending modification. According to the invention, a small amount of ethylene copolymer elastomer is added into the liquid crystal polyester resin and the aliphatic polymer, and the ethylene copolymer elastomer and the liquid crystal polyester resin are subjected to graft copolymerization reaction, so that a branched chain or a functional side group can be added on an originally highly regular molecular chain of the liquid crystal polyester resin, thereby reducing the regularity of the molecular chain of the liquid crystal polyester resin, improving the activity of the liquid crystal polyester resin, realizing good fusion with the aliphatic polymer, and enabling the obtained modified liquid crystal polyester resin composite material to have good mechanical properties and thermal stability.
The modified liquid crystal polyester resin composite material is obtained by melt mixing, extrusion, bracing, cooling and granulation, and the ethylene copolymer elastomer and the liquid crystal polyester resin can be subjected to sufficient graft copolymerization reaction through the melt mixing and then are fully fused with the aliphatic polymer, so that the prepared modified liquid crystal polyester resin composite material has good physical and chemical properties and thermodynamic properties. The method has simple process and easily controlled production conditions, and is beneficial to large-scale production.
Detailed Description
In order to make the objects, technical solutions and technical effects of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and the embodiments described below are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present invention. Those whose specific conditions are not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer; the reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be understood that the weight of the related components mentioned in the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, it is within the scope of the disclosure that the content of the related components is scaled up or down according to the embodiments of the present invention. Specifically, the weight in the embodiment of the present invention may be a unit of mass known in the chemical field such as μ g, mg, g, kg, etc.
In addition, unless the context clearly uses otherwise, an expression of a word in the singular is to be understood as encompassing the plural of the word. The terms "comprises" or "comprising" are intended to specify the presence of stated features, quantities, steps, operations, elements, portions, or combinations thereof, but are not intended to preclude the presence or addition of one or more other features, quantities, steps, operations, elements, portions, or combinations thereof.
The embodiment of the invention provides a modified liquid crystal polyester resin composite material which is prepared from the following raw materials in parts by weight:
the addition amount of the liquid crystal polyester resin is 5-20 parts. If the addition amount of the liquid crystal polyester resin is too small, the flowability of the obtained modified liquid crystal polyester resin composite material is low, the original purpose of using the liquid crystal material cannot be achieved, and the practical application is not facilitated; if the addition amount of the liquid crystal polyester resin is too large, the obtained modified liquid crystal polyester resin composite material has too high fluidity and is difficult to be well fused with the aliphatic polymer, and the toughness of the obtained modified liquid crystal polyester resin composite material is reduced, which is not favorable for realizing the purpose of the invention. In some embodiments, typical but non-limiting amounts of liquid crystalline polyester resin may be 5 parts, 10 parts, 15 parts, 20 parts.
The wholly aromatic liquid crystal polyester resin has the advantages of high temperature resistance and strong fluidity, and therefore, in some embodiments, the wholly aromatic liquid crystal polyester resin is used as the liquid crystal polyester resin, so that the modified liquid crystal polyester resin keeps a higher melting point and has good high temperature resistance.
Preferably, the wholly aromatic liquid crystalline polyester resin includes at least one of the following repeating units:
repeating units of aromatic diol: -O-Ar-O-),
Repeating units of aromatic diamine: -HN-Ar-NH-),
Repeating unit of aromatic hydroxylamine: -HNArO-,
repeating units of aromatic dicarboxylic acid: -OC-Ar-CO-),
Repeating units of aromatic hydroxycarboxylic acid: -O-Ar-CO-),
Repeating units of aromatic aminocarboxylic acid: -HN-Ar-CO-;
wherein Ar is at least one selected from the group consisting of phenylene, biphenylene, naphthalene, and an aromatic compound in which two phenylenes are bonded to each other, and an aromatic compound in which at least one hydrogen in the aromatic compound in which phenylene, biphenylene, naphthalene, and two phenylenes are bonded to each other is substituted.
The wholly aromatic liquid crystalline polyester resin used in the present invention may be a commercially available wholly aromatic liquid crystalline polyester resin as it is, or a wholly aromatic liquid crystalline polyester resin prepared by the following steps:
s1, selecting at least two monomers to carry out polycondensation reaction to synthesize a wholly aromatic liquid crystal polyester prepolymer;
s2, carrying out solid phase polycondensation on the wholly aromatic liquid crystal polyester prepolymer to obtain wholly aromatic liquid crystal polyester resin;
wherein the monomer is selected from at least one of aromatic diol, aromatic diamine and aromatic hydroxylamine, and at least one of aromatic dicarboxylic acid, aromatic hydroxycarboxylic acid and aromatic aminocarboxylic acid.
Preferably, the polycondensation reaction in S1 is a solution polycondensation reaction or a bulk polycondensation reaction. In the solution polycondensation reaction, because the solvent exists, the reaction temperature can be reduced, the reaction condition is stabilized, the insoluble monomer is favorably dissolved, and the reaction rate is improved; the high-purity polymer can be obtained by the bulk polycondensation without adding a solvent or a dispersing agent, and the method has the advantage of simple operation.
Further, in order to promote the polycondensation reaction, the monomer may be pretreated with an acylating agent to improve the reactivity of the monomer.
Still further, the acylating agent is an acetylating agent. This is because the acylating agent has the highest activity and is more favorable for the acylation reaction.
In S2, since solid-phase polycondensation is carried out by heating the prepolymer to a temperature not lower than the glass transition temperature but lower than the melting point, in some embodiments, heating with a hot plate, hot air, high-temperature fluid, or the like may be used to supply an appropriate amount of heat to the prepolymer.
Preferably, the solid phase polycondensation is carried out under an inert atmosphere or under vacuum conditions, either by removing by-products from the reaction process by inert gas or vacuum, or by making the polymer chain ends sufficiently reactive.
The addition amount of the aliphatic polymer is 30-80 parts. The aliphatic polymer has good mechanical property, heat resistance, abrasion resistance and chemical resistance, and if the addition amount of the aliphatic polymer is too small, the mechanical property and the thermal stability of the obtained modified liquid crystal polyester resin composite material are poor; if the amount of the aliphatic polymer added is too large, the liquid crystal polyester resin is reduced accordingly, and the flowability of the resulting modified liquid crystal polyester resin composite material is affected. In some embodiments, typical but non-limiting amounts of aliphatic polymers may be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts.
Because the polyamide is a mature aliphatic polymer at present, the polyamide has the advantages of good comprehensive performance and low cost. The aliphatic polymer is preferably a polyamide.
Further, the polyamide was selected from PA6YH800 petrochemical Yueyang ba Ling. PA6YH800 is a polyamide material with medium viscosity, is an aliphatic polymer polymerized by using caprolactam as a monomer, is suitable for general injection molding, and is beneficial to simplifying the preparation process.
Because the ethylene copolymer elastomer can perform graft copolymerization with the liquid crystal polyester resin, the ethylene copolymer elastomer is added into the liquid crystal polyester resin, and a branched chain or a functional side group can be added on an original highly regular molecular chain of the liquid crystal polyester resin, so that the regularity of the molecular chain of the liquid crystal polyester resin is reduced, the activity of the liquid crystal polyester resin is improved, and good fusion with an aliphatic polymer is realized. In some embodiments, the ethylene copolymer elastomer is preferably BF-E from Sumitomo, Japan. The BF-E has a molecular structure containing epoxy groups and a polyolefin structure, and the epoxy groups with high reactivity can perform ring-opening reaction with hydroxyl and carboxyl in a molecular chain of the liquid crystal polyester resin, so that the BF-E is grafted to the liquid crystal polyester resin through covalent bonds; meanwhile, the polyolefin part can be well fused with the aliphatic polymer, so that the bridging effect is achieved, and the compatibility of the liquid crystal polyester resin and the aliphatic polymer is further improved.
The addition amount of the ethylene copolymer elastomer of the present invention is 0.5 to 5 parts. If the addition amount of the ethylene copolymer elastomer is too small, sufficient branched chains or functional side groups cannot be added on the molecular chain of the liquid crystal polyester resin, and accordingly, the regularity of the liquid crystal polyester resin is not changed greatly and the activity is not improved obviously; if the amount of the ethylene copolymer elastomer added is too large, the content of the liquid-crystalline polyester resin or the aliphatic polymer is reduced accordingly, which causes problems such as deterioration in flowability or deterioration in physical and chemical properties of the resulting modified liquid-crystalline polyester resin, and affects the practical use thereof. Typical, but non-limiting, amounts of ethylene copolymer elastomer added may be, in some embodiments, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts.
The filler can improve the mechanical property of the obtained modified liquid crystal polyester resin composite material, so that the modified liquid crystal polyester resin composite material has enough mechanical strength. The addition amount of the filler is 15-30 parts. The filler can be added in a proper amount according to the addition amount of the aliphatic polymer and the actual situation, so that the obtained modified liquid crystal polyester resin composite material has proper mechanical properties. In some embodiments, typical but non-limiting amounts of filler may be 15 parts, 20 parts, 25 parts, 30 parts.
Preferably, the filler is at least one selected from the group consisting of glass fiber, whisker, wollastonite, talc, titanium dioxide, carbon black, calcium carbonate, clay, barium sulfate and silica.
According to the invention, a small amount of ethylene copolymer elastomer is added into the liquid crystal polyester resin and the aliphatic polymer, and the ethylene copolymer elastomer and the liquid crystal polyester resin are subjected to graft copolymerization reaction, so that a branched chain or a functional side group can be added on an originally highly regular molecular chain of the liquid crystal polyester resin, thereby reducing the regularity of the molecular chain of the liquid crystal polyester resin, improving the activity of the liquid crystal polyester resin, realizing good fusion with the aliphatic polymer, and enabling the obtained modified liquid crystal polyester resin composite material to have good mechanical properties and thermal stability.
The embodiment of the invention also provides a preparation method of the modified liquid crystal polyester resin composite material, which comprises the following steps:
s01, providing liquid crystal polyester resin, aliphatic polymer, ethylene copolymer elastomer and filler according to the raw material formula of the modified liquid crystal polyester resin composite material;
s02, drying and mixing the liquid crystal polyester resin, the aliphatic polymer, the ethylene copolymer elastomer and the filler, and carrying out melt mixing, extrusion, bracing, cooling and granulation to obtain the modified liquid crystal polyester resin composite material.
In step S02, the liquid crystal polyester resin, the aliphatic polymer, the ethylene copolymer elastomer, and the filler are dried to remove impurities on the surface of each material. In some embodiments, the temperature of the drying treatment is 100 ℃ to 160 ℃, and the drying efficiency can be improved on the premise of not influencing the properties of the modified liquid crystal polyester resin composite material by controlling the drying condition at a proper temperature; the drying time is 4-8 h to ensure the drying effect. Specifically, typical but non-limiting drying treatment temperatures are 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃; typical but not limiting drying treatment times are 4h, 5h, 6h, 7h, 8 h.
The modified liquid crystal polyester resin composite material is obtained by melt mixing, extrusion, bracing, cooling and granulation, and the ethylene copolymer elastomer and the liquid crystal polyester resin can be subjected to sufficient graft copolymerization reaction through the melt mixing, so that the compatibility between the liquid crystal polyester resin and the aliphatic polymer is improved, and the prepared modified liquid crystal polyester resin composite material has good mechanical property and thermal stability.
In order to clearly understand the details of the above-described implementation and operation of the present invention for those skilled in the art and to significantly embody the advanced performance of the embodiments of the present invention, the above-described technical solution is illustrated by a plurality of embodiments below.
Example 1
The components and the contents of the modified liquid crystal polyester resin composite material are shown in table 1, wherein the liquid crystal polyester resin is selected from wholly aromatic liquid crystal polyester resin (purchased from Jiangsu Wott Special materials manufacturing Co., Ltd.), the aliphatic polymer is selected from PA6YH800, the ethylene copolymer elastomer is selected from BF-E, and the filler is selected from glass fiber.
The preparation method of the modified liquid crystal polyester resin composite material comprises the following steps:
drying 9.5 parts by weight of wholly aromatic liquid crystal polyester resin, 30 parts by weight of PA6YH 80059.5, BF-E1 and glass fiber at 110 ℃ for 6 hours; and putting the dried wholly aromatic liquid crystal polyester resin, PA6YH800, BF-E and glass fiber into an automatic mixer, uniformly mixing, then putting into a double-screw extruder, carrying out melt mixing, extruding, bracing, cooling and granulating to obtain the modified liquid crystal polyester resin composite material.
Example 2
The present example is different from example 1 in that the mass ratio of the wholly aromatic liquid crystalline polyester resin, PA6YH800, BF-E and glass fiber is 8.5:58.5:3:30, and the rest is the same as example 1. Comparative example 1
The present example is different from example 1 in that the mass ratio of the wholly aromatic liquid crystalline polyester resin, PA6YH800, BF-E and glass fiber was 10:60:0:30, and the other operations were the same as example 1.
TABLE 1 addition amount of each component of examples 1 to 2 and comparative example 1
| Components | Example 1 | Example 2 | Comparative example 1 |
| Liquid crystalline polyester resin | 9.5 | 8.5 | 10 |
| Aliphatic polymers | 59.5 | 58.5 | 60 |
| Ethylene copolymer elastomer | 1 | 3 | 0 |
| Filler material | 30 | 30 | 30 |
In order to verify the properties of the modified liquid crystal polyester resin composites prepared in examples 1 to 2 and comparative example 1 of the present invention, the modified liquid crystal polyester resin composites obtained in examples 1 to 2 and comparative example 1 were injection-molded using an injection molding machine as an injection molding raw material, and the properties of the modified liquid crystal polyester resin composites obtained in examples 1 to 2 and comparative example 1 were tested and evaluated by the following methods, the test results are shown in table 2:
(1) flexural Strength and flexural modulus
The test was carried out according to ASTM D-790.
(2) Tensile Strength and tensile modulus
The test was carried out according to ASTM D-638.
(3) Heat distortion temperature
The test was carried out according to ASTM D-648.
TABLE 2 results of Performance test of modified liquid-crystalline polyester resin composites obtained in examples 1 to 2 and comparative example 1
| Performance index | Example 1 | Example 2 | Comparative example 1 |
| Heat distortion temperature/. degree.C | 194 | 195 | 189 |
| Tensile strength/MPa | 103 | 99 | 99 |
| Tensile modulus/GPa | 7.6 | 8.6 | 7.0 |
| Flexural Strength/MPa | 148 | 145 | 140 |
| Flexural modulus/GPa | 5.9 | 6.3 | 5.4 |
As is clear from table 2, by adding 1% by mass of the ethylene copolymer elastomer to the liquid crystal polyester resin and the aliphatic polymer, both the mechanical properties and the thermal stability of the resulting modified liquid crystal polyester resin composite material were improved. When the added mass of the ethylene copolymer elastomer is 3%, the tensile strength and the flexural strength of the obtained modified liquid crystal polyester resin composite material are slightly reduced, but the tensile modulus and the flexural modulus are improved, and the overall performance is better than that when the added mass is 3%.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The modified liquid crystal polyester resin composite material is characterized by being prepared from the following raw materials in parts by weight:
2. the modified liquid crystal polyester resin composite material according to claim 1, wherein the liquid crystal polyester resin is a wholly aromatic liquid crystal polyester resin.
3. The modified liquid crystal polyester resin composite according to claim 2, wherein the wholly aromatic liquid crystal polyester resin comprises at least one of the following repeating units:
repeating units of aromatic diol: -O-Ar-O-),
Repeating units of aromatic diamine: -HN-Ar-NH-),
Repeating unit of aromatic hydroxylamine: -HN-Ar-O-),
Repeating units of aromatic dicarboxylic acid: -OC-Ar-CO-),
Repeating units of aromatic hydroxycarboxylic acid: -O-Ar-CO-),
Repeating units of aromatic aminocarboxylic acid: -HN-Ar-CO-;
wherein Ar is at least one selected from the group consisting of phenylene, biphenylene, naphthalene, and an aromatic compound in which two phenylenes are bonded to each other, and an aromatic compound in which at least one hydrogen of the phenylene, biphenylene, naphthalene, and aromatic compound in which two phenylenes are bonded to each other is substituted.
4. The modified liquid crystal polyester resin composite of any one of claims 1 to 3, wherein the aliphatic polymer is a polyamide.
5. The modified liquid-crystalline polyester resin composite of any one of claims 1 to 3, wherein said filler is at least one selected from the group consisting of glass fiber, whisker, wollastonite, talc, titanium dioxide, carbon black, calcium carbonate, clay, barium sulfate and silica.
6. A method for preparing wholly aromatic liquid crystal polyester resin is characterized by comprising the following steps:
selecting at least two monomers to carry out polycondensation reaction to synthesize a wholly aromatic liquid crystal polyester prepolymer;
carrying out solid-phase polycondensation on the wholly aromatic liquid crystal polyester prepolymer to obtain wholly aromatic liquid crystal polyester resin;
wherein the monomer is selected from at least one of aromatic diol, aromatic diamine and aromatic hydroxylamine, and at least one of aromatic dicarboxylic acid, aromatic hydroxycarboxylic acid and aromatic aminocarboxylic acid.
7. The method of preparing wholly aromatic liquid crystalline polyester resin according to claim 6, wherein the polycondensation reaction is a solution polycondensation reaction or a bulk polycondensation reaction.
8. The method of preparing wholly aromatic liquid crystalline polyester resin according to claim 6, wherein the monomer is pretreated with an acylating agent before the polycondensation reaction.
9. The method of preparing wholly aromatic liquid crystalline polyester resin according to claim 6, wherein the solid phase polycondensation is performed under an inert atmosphere or under vacuum conditions.
10. The preparation method of the modified liquid crystal polyester resin composite material is characterized by comprising the following steps:
a raw material formulation of the modified liquid crystal polyester resin composite material according to any one of claims 1 to 5, wherein the raw material formulation comprises a liquid crystal polyester resin, an aliphatic polymer, an ethylene copolymer elastomer and a filler;
and drying the liquid crystal polyester resin, the aliphatic polymer, the ethylene copolymer elastomer and the filler, mixing, melting, mixing, extruding, bracing, cooling and granulating to obtain the modified liquid crystal polyester resin composite material.
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Cited By (1)
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| CN113698724A (en) * | 2021-09-02 | 2021-11-26 | 宁夏清研高分子新材料有限公司 | SBS modified liquid crystal polymer composite material and preparation method thereof |
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| CN108276746A (en) * | 2017-12-26 | 2018-07-13 | 上海普利特化工新材料有限公司 | A kind of liquid crystal polyester/nylon alloy material and preparation method thereof |
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| CN113698724A (en) * | 2021-09-02 | 2021-11-26 | 宁夏清研高分子新材料有限公司 | SBS modified liquid crystal polymer composite material and preparation method thereof |
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