WO2023103273A1 - Liquid crystalline polymer composite material for rapid injection molding and preparation method therefor, and injection molding screw for rapid injection molding - Google Patents

Abstract

Provided in the present disclosure are a liquid crystalline polymer composite material for rapid injection molding and a preparation method therefor, and an injection molding screw for rapid injection molding, belonging to the technical fields of liquid crystalline polymers and processing. The composite material of the present disclosure comprises: 43.9-99.899 parts of a thermotropic liquid crystalline polymer; 0-50 parts of a filler; 0-5 parts of a color masterbatch; 0.1-1.0 part of a lubricant; and 0.001-0.1 part of a modifier. Taking a screw having a diameter of 32 mm as an example, the compression ratio of the screw is 2.5:1 to 2.0:1; the proportion of a feed section is 30-60%, and the screw channel depth thereof is 6.0-7.5 mm; the proportion of a compression section is 20-40%; and the proportion of a metering section is 16-25%, and the screw channel depth thereof is 2.4-4.0 mm. The composite material of the present disclosure is short in terms of an injection molding period and stable in terms of product quality. Moreover, the present disclosure provides a simple and convenient preparation method, and further provides an injection molding screw for rapid injection molding.

Description

Rapid injection molding liquid crystal polymer composite material and its preparation method and injection molding screw used for rapid injection molding

Cross References to Related Applications

This disclosure requires the application number "CN 202111484905.7" submitted to the Chinese Patent Office on December 07, 2021. The Chinese patent titled "Rapid injection molding liquid crystal polymer composite material and its preparation method and injection molding screw used for rapid injection molding" priority of the application, the entire contents of which are incorporated by reference into this disclosure.

technical field

The disclosure relates to a rapid injection molding liquid crystal polymer composite material, a preparation method thereof and an injection screw used for rapid injection molding, and belongs to the technical field of liquid crystal polymers and processing.

Background technique

Thermotropic Liquid Crystalline Polymer (LCP) is a special engineering plastic with excellent comprehensive performance (six special engineering plastics: polyphenylene sulfide (PPS) and polyether ether ketone (PEEK), polysulfone ( PSF), polyimide (PI), polyarylate (PAR), liquid crystal polymer (LCP)), wherein liquid crystal polymer (LCP) is an aromatic high-temperature polyester composed of rigid rod-shaped macromolecular chains, After being melted by heat or dissolved by a solvent, a liquid crystal state with both solid and liquid properties is formed. The special phase structure of liquid crystal polymer leads to the following characteristics: self-reinforcement effect; small linear expansion coefficient; excellent heat resistance; self-flame retardancy; low melt viscosity, good fluidity; small molding shrinkage; Good chemical resistance, etc. Due to the excellent comprehensive properties of liquid crystal polymers in thermal, electrical, mechanical, and chemical aspects, more and more applications are in various high-tech fields: aerospace, electronic information, security fields, 5G, new energy, etc.

Due to its extremely low melt viscosity, liquid crystal polymer composites have the following deficiencies during injection molding:

1. The plastic particles in the feeding section are tumbling on the spot, and do not follow the rotation of the screw to advance.

2. The molten plastic cannot be accurately stored and measured in the metering section.

3. In turn, the storage of the processing screw is insufficient, the measurement is unstable, and the molding cycle fluctuates, which eventually leads to poor processing performance and difficult control of product quality.

Regarding how to improve the research on the processing and molding of liquid crystal polymer composite materials, there is no effective solution at present.

Contents of the invention

The present disclosure provides a rapid injection molding liquid crystal polymer composite material, including the following raw materials in mass percentage:

The modifying agent is one or more of stearic acid metal salts.

In some embodiments, the thermotropic liquid crystal polymer has a melting point of 280-335° C., a melt viscosity of 20-65 Pa.s, and a shear rate of 1200/s.

In some embodiments, the filler is one or more of chopped glass fiber, ground glass fiber, mineral fiber or mineral powder.

In some embodiments, the chopped glass fiber is an alkali-free glass fiber: the length is 3-6 mm, and the diameter is 4-15 μm;

The ground glass fiber is alkali-free glass fiber: the length is 60-300 μm, and the diameter is 4-15 μm;

The mineral fiber is wollastonite mineral fiber: the length of the mineral fiber is 0.1-0.8 mm, and the diameter is 4-20 μm;

The mineral powder is one or more of talcum powder, mica powder, metal pyrophosphate, calcium carbonate, wollastonite, silicon carbide or boron nitride.

In some embodiments, the color masterbatch is prepared by adding toner and lubricant to thermotropic liquid crystal polymer.

In some embodiments, the formula of the masterbatch is as follows:

Thermotropic liquid crystal polymer 79～79.9 parts;

Toner 20 parts;

Lubricant 0.1 to 1.0 parts.

In some embodiments, the lubricant is one or more of fatty acid amides, hydrocarbons, fatty acids, esters, alcohols, metal soaps, silicone lubricants or composite lubricants.

In some embodiments, the stearic acid metal salts are sodium salts, potassium salts, calcium salts or magnesium salts.

The present disclosure also provides a method for preparing a rapid injection molding liquid crystal polymer composite material described in any one of the above, including the following steps:

(1) Preparation of color masterbatch:

After mixing the toner, lubricant and thermotropic liquid crystal polymer, add it to the extruder and process it through heating, mixing, drawing, cooling, cutting into pellets, and packaging to prepare it for use;

(2) Preparation of liquid crystal polymer composite materials by rapid injection molding:

① Mix the dried masterbatch, lubricant and thermotropic liquid crystal polymer evenly and feed them into the twin-screw extruder through the main feed;

②The filler is fed into the extruder through the downstream side; the mixture is heated, mixed, drawn, cooled, and pelletized;

③Dry the particles, add modifier, mix well and pack.

The present disclosure also provides the injection molding screw used for rapid injection molding described in any one of the above, the screw with a diameter of 32 mm, the screw compression ratio is 2.5:1 to 2.0:1, the feed section accounts for 30 to 60%, and the screw groove depth is 6.0 ~7.5mm, the compression section accounts for 20-40%, the metering section accounts for 16-25%, and the screw groove depth is 2.4-4.0mm.

The present disclosure also provides a rapid injection molding device, which includes the injection molding screw.

In some embodiments, the device also includes:

heating equipment;

Material supply equipment.

The present disclosure also provides the application of the rapidly injection-molded liquid crystal polymer composite material in aerospace, electronic information, security fields, 5G technology, and new energy fields.

Description of drawings

Fig. 1 is a schematic structural view of an injection molding screw in some embodiments of the present disclosure.

Detailed ways

The present disclosure will be further described below in conjunction with the embodiments, but they do not limit the protection scope and implementation of the present disclosure.

An embodiment of the present disclosure provides a rapid injection molding liquid crystal polymer composite material, which has a short injection molding time period and stable product quality; at the same time, an embodiment of the present disclosure provides a simple and convenient preparation method, and also provides a An injection molding screw for rapid injection molding.

One embodiment of the present disclosure provides rapid injection molding liquid crystal polymer composite materials, including the following raw materials in mass percentage:

The modifying agent is one or more of stearic acid metal salts. In some typical embodiments, stearic acid metal salts include but not limited to sodium salts, potassium salts, calcium salts or magnesium salts.

In some embodiments, the rapid injection molding liquid crystal polymer composite material includes the following raw materials in mass percentage: the thermotropic liquid crystal polymer can be, for example, 43.9 to 99 parts, 50 to 99.899 parts, or 45 to 99.899 parts, such as 44 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts or 99 parts; fillers can be, for example, 0-45 parts, 10-50 parts or 10 to 45 parts, such as 0.1 part, 1 part, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts; the color masterbatch can be such as 0.1 part, 1 part, 2 parts, 3 parts, 4 parts or 5 parts; lubricant can be such as 0.1 part, 0.2 part, 0.4 part, 0.5 part, 0.7 part, 0.9 part or 1.0 part; modifier can be 0.001 part parts, 0.003 parts, 0.005 parts, 0.009 parts, 0.01 parts, 0.03 parts, 0.05 parts, 0.07 parts or 0.1 parts.

In some typical embodiments, the thermotropic liquid crystal polymer has a melting point of 280-335° C., a melt viscosity of 20-65 Pa.s, and a shear rate of 1200/s (a capillary rheometer is selected for the melt viscosity test, According to the ISO 11443 standard). In some embodiments, the thermotropic liquid crystal polymer has a melting point of, for example, 280-330°C, 285-330°C, or 290-330°C, such as 280°C, 285°C, 290°C, 295°C, 300°C, 305°C, 310°C , 315°C, 320°C, 325°C or 330°C; melt viscosity is 20-65Pa.s, such as 25-65Pa.s, 20-60Pa.s or 25-60Pa.s, such as 20Pa.s, 22Pa.s , 24Pa.s, 26Pa.s, 28Pa.s, 30Pa.s, 34Pa.s, 36Pa.s, 38Pa.s, 40Pa.s, 42Pa.s, 45Pa.s, 50Pa.s, 52Pa.s, 55Pa .s, 58Pa.s, 60Pa.s, 62Pa.s, 64Pa.s or 65Pa.s.

In some typical embodiments, the filler includes, but is not limited to, one or more of chopped glass fiber, ground glass fiber, mineral fiber or mineral powder.

In some typical embodiments, chopped glass fibers include but are not limited to E-glass fibers: lengths of 3-6 mm such as 3 mm, 4 mm, 5 mm, 6 mm, diameters of 4-15 μm such as 4 μm, 5 μm, 6 μm, 7 μm, 8 μm , 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm.

In some typical embodiments, milled glass fibers include but are not limited to E-glass fibers: 60-300 μm in length such as 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 120 μm, 140 μm, 160 μm , 180 μm, 200 μm, 220 μm, 240 μm, 260 μm, 280 μm or 300 μm; a diameter of 4 to 15 μm such as 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm or 15 μm.

In some typical embodiments, the mineral fiber includes but not limited to wollastonite mineral fiber: the length of the mineral fiber is 0.1-0.8 mm such as 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm or 0.8 mm, and the diameter is 4-20 μm such as 4μm, 5μm, 7μm, 9μm, 10μm, 12μm, 14μm, 16μm, 18μm or 20μm.

In some typical embodiments, the mineral powder includes, but is not limited to, one or more of talc powder, mica powder, metal pyrophosphate, calcium carbonate, wollastonite, silicon carbide, or boron nitride.

In some typical embodiments, the color masterbatch is prepared by adding high temperature resistant toner and lubricant to thermotropic liquid crystal polymer.

In some typical embodiments, the formula of color masterbatch (or called color masterbatch) is as follows:

Thermotropic liquid crystal polymer 79～79.9 parts;

Toner 20 parts;

Lubricant 0.1 to 1.0 parts.

In some typical embodiments, the toner can be a high-temperature-resistant toner, which includes but is not limited to carbon black or other pigments, such as Vulcan XC305 (CABOT) or Black Pearls 4750 (CABOT) or Ultramarine Blue 5006 (HOLLIDAY ) or Paliotol Yellow K1800 (BASF), etc.

In some typical embodiments, lubricants include, but are not limited to, one or more of fatty acid amides, hydrocarbons, fatty acids, esters, alcohols, metal soaps, silicone lubricants or complex lubricants kind.

One embodiment of the present disclosure provides a method for preparing the above rapid injection molding liquid crystal polymer composite material, including the following steps:

(1) Preparation of color masterbatch:

After uniformly mixing the toner, lubricant and thermotropic liquid crystal polymer, add it into the extruder and process it through heating, mixing, drawing, cooling, pelletizing and packaging, and it is ready for use;

(2) Preparation of liquid crystal polymer composite materials by rapid injection molding:

①Mix the dried masterbatch, lubricant and thermotropic liquid crystal polymer evenly, and feed them into the twin-screw extruder through the main feed;

②The filler is fed into the extruder through the downstream side; the mixture is heated, mixed, drawn, cooled, and pelletized;

③Dry the particles at high temperature, add a certain proportion of modifier, mix well and pack.

One embodiment of the present disclosure provides the above-mentioned injection molding screw used for rapid injection molding (rapid injection molding liquid crystal polymer composite material), taking a screw with a diameter of 32mm as an example, the screw compression ratio is 2.5:1 to 2.0:1 such as 2.5:1, 2.4 :1, 2.3:1, 2.2:1, 2.1:1 or 2.0:1, the feed section accounts for 30-60%, such as 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58% or 60%, screw groove depth 6.0~7.5mm such as 6.0mm, 6.2mm, 6.4mm, 6.5mm, 6.7mm, 7.0mm, 7.2mm or 7.4mm, the compression section accounts for 20-40%, such as 21%, 24%, 25%, 26%, 28%, 30%, 32%, 34%, 36%, 38% or 40% , the metering section accounts for 16-25%, such as 17%, 18%, 19%, 20%, 22%, 24% or 25%, and the screw groove depth is 2.4-4.0mm, such as 2.5mm, 2.7mm, 3.0mm, 3.2mm , 3.4mm, 3.6mm, 3.8mm or 4.0mm. The screw design is based on the size of the screw diameter, and optional design can be carried out according to this idea.

See accompanying drawing 1 for the schematic diagram of the structure of the injection molding screw.

Table 1 shows the comparison results of parameters between the injection molding screw according to an embodiment of the present disclosure and the conventional injection molding screw.

Table 1 Comparison of parameters between an injection molding screw according to an embodiment of the present disclosure and a conventional injection molding screw

*: Conventional screw design is FANUC ROBOSHOT@-S100i A standard screw.

Due to the overall ultra-low viscosity of the liquid crystal polymer composite material, the composite material slips during the injection molding process, resulting in fluctuations in plasticization and metering, and the molding cycle is too long. In the present disclosure, by coating a layer of stearate modifier on the conventional liquid crystal polymer composite material, the injection molding cycle is significantly shortened without damaging the mechanical properties, fluidity, and temperature resistance of the liquid crystal polymer composite material. Especially the plasticizing and metering cycle not only ensures the batch stability of the product, but also improves the production efficiency.

At the same time, this disclosure makes a series of improvements to the conventional screw design, wherein the original screw diameter is retained, the length-to-diameter ratio and the rubber storage volume remain unchanged, including reducing the compression ratio (2.5:1～2.0:1), reducing the proportion of the metering section, and appropriately Increase the screw groove depth of the feeding section and metering section, etc., and the new screw combination can greatly shorten the injection molding cycle.

An embodiment of the present disclosure provides a rapid injection molding device, which includes the above-mentioned injection molding screw.

In some embodiments, the rapid injection molding device further includes: heating equipment; material supply equipment. In some embodiments, the heating device is used for heating the composite material during the injection molding process of the liquid crystal polymer composite material for injection molding. In some embodiments, the material supply equipment is used for the supply of raw material color masterbatch, lubricant and thermotropic liquid crystal polymer during the injection molding process of the liquid crystal polymer composite material.

One embodiment of the present disclosure provides the application of the rapid injection molding liquid crystal polymer composite material in aerospace, electronic information, security fields, 5G technology, and new energy fields.

Compared with the prior art, the present disclosure has the following improvements:

(1) By increasing the consistency of the production process, this disclosure achieves good performance consistency of different batches of products and improves product stability;

(2) This disclosure shortens the injection molding time cycle, injects more products at the same time, and meets the customer's order demand; especially in the case of urgent orders, it solves the problem of long delivery cycle and significantly improves efficiency;

(3) The reduction of time cost, labor cost, electricity and other costs of a single injection molded part makes the product cost lower than that of competitors, improves the competitiveness of the company's products, and increases the company's economic benefits.

The present disclosure will be further described below in conjunction with the examples, but they do not limit the implementation of the present disclosure.

Example

(1) Preparation of rapid injection molding liquid crystal polymer composites

Embodiment A: A kind of preparation method of the liquid crystal polymer composite material of rapid injection molding, comprises the following steps:

(1) Preparation of masterbatch

Weigh 79.4 parts of thermotropic liquid crystal polymer, 20 parts of toner (carbon black Vulcan XC305 (CABOT)), and 0.6 parts of lubricant (dipentaerythritol stearate) in parts by mass.

Mix the above materials evenly through a mixer, and feed them into the extruder through the main feeding port (the diameter of the screw is Φ=25mm).

The heating temperature of the extruder is set as follows: Zone 1 to Zone 10 are 200°C, 260°C, 280°C, 300°C, 325°C, 335°C, 340°C, 345°C, 345°C, 340°C, and the screw speed is 350rpm , production rate 25kg/hr.

(2) Preparation of a rapid injection molding liquid crystal polymer composite material

Weigh 0.3 parts of lubricant PETS in parts by mass, take 5 parts of the thermotropic liquid crystal polymer, and mix them uniformly for later use; 5 parts of the color masterbatch are dried for later use; the remaining amount of the thermotropic liquid crystal polymer is dried Dry standby; feed into the extruder separately through the main feeding port;

Feed the specified number of fillers into the extruder through the downstream side feed;

The above materials are prepared through the processes of heating, mixing, drawing, cooling, dicing and packaging; the products are ready for use after passing the test. The heating temperature of the extruder is set as follows: Zone 1 to Zone 10 are 200°C, 260°C, 280°C, 300°C, 325°C, 335°C, 340°C, 345°C, 345°C, 340°C, and the screw speed is 450rpm, production rate 20kg/hr.

It should be noted that the order of adding the liquid crystal polymer composite material of the present disclosure is not limited to the order described in the above examples, and the composite materials can be combined and fed at the same time; or all the lubricants, all the thermotropic liquid crystals can be added first polymer and all color masterbatches, then the rest of the materials are added to the extruder through the downstream side feed (it can also achieve the effect of mixing the materials similar to embodiment A); it can also be based on the technology of those skilled in the art Feed by experience, as long as the composite material is mixed evenly.

After drying the composite material particles prepared by extrusion, add calcium stearate powder, stir and mix for 30 minutes to obtain evenly coated calcium stearate composite material particles.

in:

The thermotropic liquid crystal polymer used is Changchun Chemical LCR-300, with a melting point of 333.6°C, a melt viscosity of 27Pa.s, a test temperature of 345°C, and a shear rate of 1200/s (capillary rheology was selected for the melt viscosity test instrument according to the ISO 11443 standard).

The chopped glass fiber is Taishan glass fiber T443R; the ground glass fiber is Jushi EMG13-70C; the mineral fiber is Jiangxi Huajie wollastonite mineral fiber; the mineral powder is Xicheng new material talcum powder.

The modifier used is Sanyi Chemical SAK-CS-P calcium stearate. Add a very small amount (0.005%) to the composite material particles obtained by extrusion granulation, and stir and mix evenly.

Preparation and Comparison of Examples and Comparative Examples

Examples 1-4 and Comparative Examples 1-4 were used to prepare liquid crystal polymer composite materials for rapid injection molding. The other steps adopted in the following Examples 1-4 and Comparative Examples 1-4 are the same as those in Example A above, the difference lies in the formula, see Table 2 for different formula ratios.

Table 2 Liquid crystal polymer composite material formula for rapid injection molding

Dry the liquid crystal polymer composite materials prepared in the above Examples 1-4 and Comparative Examples 1-4, complete the injection molding task on an injection molding machine (FANUC ROBOSHOT@-S100i A) with a clamping force of 100 tons, and evaluate the mold as ISO pull Stretch splines.

It should be noted that the components of the composite material in Table 2 can also be expressed in parts by weight, such as 64.7 parts of thermotropic liquid crystal polymer, 5 parts of color masterbatch, 0.3 part of lubricant, 50 parts of chopped glass fiber, 0.005 parts of modifier; 64.7 parts of thermotropic liquid crystal polymer, 5 parts of color masterbatch, 0.3 parts of lubricant, and 50 parts of chopped glass fiber in the composite material of Comparative Example 1.

(2) Comparison of different screw designs

Example 5

Design and parameters of injection molding screw

The comparison table between the screw design of Example 5 of the present disclosure and the conventional screw design is shown in Table 3.

Table 3 Comparison of parameters between the injection molding screw described in the present disclosure and the conventional injection molding screw

(3) Processing comparison of different liquid crystal polymer composite materials applied to different screws

The different liquid crystal polymer composite materials prepared in (1) above were processed by different screws in (2) above, and the injection molding cycle was compared.

Set fixed processing parameters: screw speed, barrel temperature, set parameters by adjusting back pressure (10 bar, 15 bar, 30 bar (bar)).

(1) The different liquid crystal polymer composite materials prepared in Examples 1 to 4 and Comparative Examples 1 to 4 above were processed using a conventional screw design machine, and the injection molding cycle data are summarized in Table 4 below.

Table 4 Comparison summary of injection molding cycle of conventional screw design machine

(2) The liquid crystal polymer composite materials prepared in Comparative Examples 1 to 4 were respectively processed by the conventional screw in the above (2) and the screw injection molding of Example 5 of the present disclosure for comparison, and the processing cycle is shown in Table 5.

Table 5 Comparison summary of the injection molding cycle of the composite material prepared in the comparative example

(3) The liquid crystal polymer composite materials prepared in Examples 1, 2, 3, and 4 were processed by the conventional screw in the above (2) and the screw injection molding process in Example 5 of the present disclosure respectively, and the processing cycle is shown in Table 6.

Table 6 Comparison summary of the injection molding cycle of the composite material obtained in the embodiment

The comparative test results in Table 4 show that the injection molding cycle of the liquid crystal polymer composite material coated with stearate in the present disclosure is significantly shortened, and the production efficiency is increased by about 100%.

The comparative test results in Table 5 show that by resetting the three-stage ratio of the screw, the depth of the screw groove and a more reasonable compression ratio, the screw configuration of the disclosed embodiment can significantly shorten the injection molding cycle of the liquid crystal polymer composite material.

Combined with the experimental results in Table 6, it is shown that the rapid injection molding liquid crystal polymer composite material described in the present disclosure can shorten the processing and molding cycle by 400-500% on the machine equipped with the screw design and configuration of the embodiment of the present disclosure, which greatly improves the injection molding process. Medium plasticization, material storage and metering efficiency ensure the stability of the injection molding process and parts.

Industrial Applicability

The present disclosure provides rapid injection molding liquid crystal polymer composite material and its preparation method and injection molding screw used for rapid injection molding. The composite material injection molding time period provided by the present disclosure is short and the product quality is stable; at the same time, the disclosure provides simple and convenient The preparation method, and the rapid injection molding liquid crystal polymer composite material of the present disclosure is provided on the screw design and configuration machine provided by the disclosure, the processing and molding cycle is significantly shortened, and the plasticization, storage and metering efficiency in the injection molding process are greatly improved. It ensures the stability of the injection molding process and parts, and has a wide range of applications and excellent practical value.

Claims (13)

1. A rapid injection molding liquid crystal polymer composite material is characterized in that it includes the following raw materials in mass percentage:

   

   The modifying agent is one or more of stearic acid metal salts.
2. The rapid injection molding liquid crystal polymer composite material according to claim 1, characterized in that: the melting point of the thermotropic liquid crystal polymer is 280-335°C, the melt viscosity is 20-65Pa.s, and the shear rate is 1200 /s.
3. The rapid injection molding liquid crystal polymer composite material according to claim 1 or 2, characterized in that: the filler is one or more of chopped glass fiber, ground glass fiber, mineral fiber or mineral powder.
4. The rapid injection molding liquid crystal polymer composite material according to claim 3, characterized in that: the chopped glass fiber is an alkali-free glass fiber: the length is 3-6 mm, and the diameter is 4-15 μm;

   The ground glass fiber is alkali-free glass fiber: the length is 60-300 μm, and the diameter is 4-15 μm;

   The mineral fiber is wollastonite mineral fiber: the length of the mineral fiber is 0.1-0.8 mm, and the diameter is 4-20 μm;

   The mineral powder is one or more of talcum powder, mica powder, metal pyrophosphate, calcium carbonate, wollastonite, silicon carbide or boron nitride.
5. The rapid injection molding liquid crystal polymer composite material according to any one of claims 1 to 4, characterized in that: the color masterbatch is prepared by adding toner and lubricant to thermotropic liquid crystal polymer.
6. The rapid injection molding liquid crystal polymer composite material according to claim 5 is characterized in that: the formula of the color masterbatch is as follows:

   Thermotropic liquid crystal polymer 79～79.9 parts;

   Toner 20 parts;

   Lubricant 0.1 to 1.0 parts.
7. The rapid injection molding liquid crystal polymer composite material according to any one of claims 1 to 6, characterized in that: the lubricant is fatty acid amides, hydrocarbons, fatty acids, esters, alcohols, metal soaps One or more of lubricants, silicone lubricants or compound lubricants.
8. The rapid injection molding liquid crystal polymer composite material according to any one of claims 1-7, characterized in that: the stearic acid metal salts are sodium salts, potassium salts, calcium salts or magnesium salts.
9. A method for preparing a rapid injection molding liquid crystal polymer composite material according to any one of claims 1 to 8, characterized in that it comprises the following steps:

   (1) Preparation of color masterbatch:

   After mixing the toner, lubricant and thermotropic liquid crystal polymer, add it to the extruder and process it through heating, mixing, drawing, cooling, cutting into pellets, and packaging to prepare it for use;

   (2) Preparation of liquid crystal polymer composite materials by rapid injection molding:

   ① Mix the dried masterbatch, lubricant and thermotropic liquid crystal polymer evenly and feed them into the twin-screw extruder through the main feed;

   ②The filler is fed into the extruder through the downstream side; the mixture is heated, mixed, drawn, cooled, and pelletized;

   ③Dry the particles, add modifier, mix well and pack.
10. An injection molding screw for rapid injection molding according to any one of claims 1 to 8, characterized in that: the diameter of the screw is 32 mm, the screw compression ratio is 2.5:1 to 2.0:1, and the ratio of the feed section is 30 to 60 %, the screw groove depth is 6.0-7.5mm; the compression section accounts for 20-40%; the metering section accounts for 16-25%, and the screw groove depth is 2.4-4.0mm.
11. A rapid injection molding device, characterized in that the device comprises the injection molding screw as claimed in claim 10.
12. The rapid injection molding device according to claim 11, wherein the device further comprises:

    heating equipment;

    Material supply equipment.
13. Use of the rapid injection molding liquid crystal polymer composite material according to any one of claims 1 to 8 in the fields of aerospace, electronic information, security, 5G technology, and new energy.

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