CN114752186A - Liquid crystal polyester compound applied to camera module parts and preparation method thereof - Google Patents
Liquid crystal polyester compound applied to camera module parts and preparation method thereof Download PDFInfo
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- CN114752186A CN114752186A CN202210392455.7A CN202210392455A CN114752186A CN 114752186 A CN114752186 A CN 114752186A CN 202210392455 A CN202210392455 A CN 202210392455A CN 114752186 A CN114752186 A CN 114752186A
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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
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
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Abstract
The application discloses a liquid crystal polyester compound and a manufacturing method and application thereof. The liquid crystal polyester compound comprises the following components in parts by weight: 50-80 parts of liquid crystal polyester resin, 2-25 parts of polyphenylene sulfide resin and 8-50 parts of filler, wherein the liquid crystal polyester compound is used for preparing parts of a camera module. The liquid crystal polyester compound has high hardness, the hardness meets the application requirement of a camera module, and the friction coefficient of the liquid crystal polyester compound is small. The preparation method has easily controlled process, the prepared material has stable performance, and the production cost is effectively reduced.
Description
Technical Field
The application belongs to the technical field of camera module components and component materials, and particularly relates to a liquid crystal polyester compound applied to camera module parts and a preparation method and application thereof.
Background
The automatic focusing system of the mobile phone camera module mainly comprises the following components: 1. a lens; 2. a motor; 3. a motor driving chip; 4. and a photosensitive chip. The lens and the photosensitive chip are main imaging devices, and the motor driving chip are main automatic focusing devices. The motor mainly functions to drive the lens to move. The motor here is a general term for an Auto Focus Actuator (Auto Focus Actuator). There are various actuators for AF in practice, such as a Voice Coil Motor (VCM), a piezoelectric motor (Piezo), and the like. VCM differs from the chip type VCM and the ball type VCM.
The whole control process can be understood as follows: a code is given by the platform, the driving chip can output corresponding current, the motor can make corresponding displacement, the lens can correspondingly image on the chip, the chip outputs the image to the control end after obtaining the image, and the control end judges whether the clearest position is reached or not by judging the definition of the image, so that automatic focusing is realized.
However, the autofocus actuator has problems of shaking and insufficient accuracy. Because the carrier for fixing the lens in the motor is fixed by the elastic sheet, after the carrier reaches a specified position, the carrier can still continuously vibrate for a short time due to the stress relationship of the elastic sheet. For high-end modules, there are certain drawbacks in focusing speed and imaging effect, which are problems that must be encountered.
The existing solution is to use balls to realize accurate control, reduce the shaking time, accelerate the focusing speed, and thus improve the imaging quality. However, the ball is required to be matched with the rail, the rail is required to be thin, and the traditional high-hardness materials such as PEEK and POM cannot be well applied to the field due to poor flowability. In addition, since the ball is in contact with the lens frame, the ball may cause some damage to both the lens holder and the carrier during focusing, and the ball may generate dents and scratches on the surfaces of the lens holder and the carrier, which may interfere with the movement of the ball, thereby causing the camera module to have reduced focusing accuracy or to be controlled for focusing. The scheme adopted in the market at present is a Liquid Crystal Polyester (LCP) material with good flowability, but in application, the LCP is found to have the defects of poor hardness, short service life of a track and low automatic focusing precision of an automatic focusing actuator.
Disclosure of Invention
The present application aims to overcome the defects in the prior art, and provides a liquid crystal polyester compound, and a preparation method and an application thereof, so as to solve the technical problems of short service life of camera module components and low auto-focusing precision caused by low hardness of the existing liquid crystal polyester resin.
In order to achieve the above-mentioned application object, in a first aspect of the present application, a liquid crystal polyester compound is provided. The liquid crystal polyester compound comprises the following components in parts by weight:
50-80 parts of liquid crystal polyester resin
2-25 parts of polyphenylene sulfide resin
8-50 parts of a filler;
the liquid crystal polyester compound is used for preparing camera module parts.
In a second aspect of the present application, a method for preparing a liquid crystal polyester composite is provided. The preparation method of the liquid crystal polyester compound comprises the following steps:
weighing raw materials of each component according to the component types and the content of the liquid crystal polyester compound;
and carrying out melt mixing extrusion treatment on the weighed raw materials of the components.
The third aspect of the present application provides a camera module. The camera module comprises a lens support and a carrier used for controlling and fixing the lens support, the carrier comprises balls and a track used for bearing and allowing the balls to roll, the balls are in contact with the lens support and control the movement of the lens support, and the track and/or the lens support are made of liquid crystal polyester compound prepared by the liquid crystal polyester compound preparation method.
Compared with the prior art, the liquid crystal polyester compound takes the liquid crystal polyester resin as a basic resin component, and is modified by the contained polyphenylene sulfide resin, the filler and other components, so that the liquid crystal polyester compound has high hardness, the hardness meets the application requirement of a camera module, and the friction coefficient is small.
According to the preparation method of the liquid crystal polyester compound, the components are directly subjected to melting, mixing and extrusion treatment according to the types and proportions of the components contained in the liquid crystal polyester compound, so that the components can be fully dispersed and act with each other to modify the liquid crystal polyester resin, the extruded liquid crystal polyester compound has high hardness and low friction coefficient, and the requirements of camera module application are met. In addition, the preparation method has the advantages of easily controlled process, stable performance of the prepared material and effective reduction of the production cost.
The track and/or the lens support that this application camera module contained is formed by this application liquid crystal polyester compound preparation, and consequently, this track and/or lens support hardness is high, and coefficient of friction is low, has effectively guaranteed the stability of track working property and has prolonged orbital life-span, has improved the accurate control of camera lens to the accurate auto focus of camera module has been improved.
Detailed Description
In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not imply an execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not limit the implementation process of the embodiments of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The weight of the related components mentioned in the description of the embodiments of the present application 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, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.
The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In a first aspect, embodiments of the present application provide a liquid crystal polyester composite. The liquid crystal polyester compound comprises the following components in parts by weight:
40-80 parts of liquid crystal polyester resin
5-20 parts of polyphenylene sulfide resin
20-40 parts of a filler.
In this way, the liquid crystal polyester compound of the embodiments of the present application uses the liquid crystal polyester resin as a base resin component, and is modified by the contained components such as the polyphenylene sulfide resin and the filler, so that the liquid crystal polyester compound of the embodiments of the present application has high hardness, the hardness meets the application requirements of the camera module, and the liquid crystal polyester compound has a small friction coefficient and good fluidity.
In an embodiment, the liquid crystal polyester resin includes a wholly aromatic liquid crystal polyester resin. The wholly aromatic liquid crystal polyester resin has excellent high temperature resistance, flowability and processability, and can play a role in synergism after being compounded with the polyphenylene sulfide resin and the filler, so that the hardness of the liquid crystal polyester compound in the embodiment of the application is remarkably improved, the friction coefficient of the formed product is small, and the excellent flowability is maintained.
In further embodiments, the liquid crystal polyester resin such as a wholly aromatic liquid crystal polyester resin may include a liquid crystal polyester resin whose monomer unit includes two or more of HBA, HNA, TPA, IPA, BP, APAP. In a further embodiment, the liquid crystal polyester resin such as a wholly aromatic liquid crystal polyester resin includes at least one LCP resin of Tape I type or Tape II type. In a specific embodiment, the liquid crystal polyester resin such as a wholly aromatic liquid crystal polyester resin may include at least one series of LCP resin among KD, KH, KC of jiangsuwott special material manufacturing company. In some embodiments, the liquid crystal polyester resin, such as a wholly aromatic liquid crystal polyester resin, has a number average molecular weight of 10000 to 30000. By controlling and optimizing the type and molecular weight of the liquid crystal polyester resin, the compatibility of the liquid crystal polyester resin with polyphenylene sulfide resin and filler is improved, the hardness and the flowability of the liquid crystal polyester compound are further improved, and the surface friction is reduced.
In addition, the liquid crystal polyester resin is 50 to 80 parts by weight, and further 55 to 70 parts by weight of the liquid crystal polyester compound in the embodiment of the application. In the research of the inventor, the content ratio of the liquid crystal polyester resin is higher than 80 parts, the addition of the polyphenylene sulfide resin and the filler is influenced, so that the modification effect of the polyphenylene sulfide resin and the filler on the liquid crystal polyester resin is reduced, the synergistic effect of the polyphenylene sulfide resin and the filler on the liquid crystal polyester resin is reduced, and the hardness and the friction resistance of the liquid crystal polyester compound are reduced; if the addition amount is too small, for example, less than 50 parts, the synergistic effect among the three components is also reduced, resulting in a reduction in the fluidity of the liquid crystal polyester composite and a reduction in other mechanical properties.
The polyphenylene sulfide resin contained in the liquid crystal polyester compound in the embodiment of the application modifies the liquid crystal polyester resin, and the polyphenylene sulfide resin has better compatibility with the liquid crystal polyester resin, particularly with the wholly aromatic liquid crystal polyester resin, can be better fused, can improve the hardness and the friction resistance of the liquid crystal polyester compound, and can improve the surface smoothness of a formed product to reduce the friction coefficient. In one embodiment, the polyphenylene sulfide resin can be selected from commercially available polyphenylene sulfide resins.
The polyphenylene sulfide resin is further 5 to 20 parts by weight in the liquid crystal polyester composite of the examples of the present application. By the proportioning of the polyphenylene sulfide resin in the liquid crystal polyester compound of the embodiment of the application, the modification effect of the polyphenylene sulfide resin on the liquid crystal polyester resin can be improved, and the hardness, the friction resistance and the good fluidity of the liquid crystal polyester compound are improved.
The filler contained in the liquid crystal polyester compound in the embodiment of the application can perform a synergistic modification effect on the base material liquid crystal polyester resin with the polyphenylene sulfide resin, so that the liquid crystal polyester compound is endowed with high hardness and friction resistance, and the liquid crystal polyester compound product is endowed with high surface smoothness and low friction coefficient by adjusting the content of the filler. In the examples, the weight portion of the filler in the liquid crystal polyester composite of the examples of the present application is further 10-30 parts. In other embodiments, the filler comprises at least one of mica, wollastonite, talc, barium sulfate, whiskers, and carbon black. By further optimizing the content and the type of the filler, the functions of the filler exerted by the liquid crystal polyester compound in the embodiment of the application can be improved, and the high hardness, the friction resistance and the preparation surface performance of the liquid crystal polyester compound are further improved. In addition, the inventor finds in research that the fiber such as glass fiber as the filler reduces the above-mentioned effect of the filler, but at the same time reduces the smoothness of the surface of the liquid crystal polyester compound, increases the friction coefficient thereof, and causes the liquid crystal polyester compound to be easily worn, and the worn fiber such as glass fiber fragments can cause the camera module to be stuck or even dead, so the fiber is not ideal as the filler in the present application.
In a further embodiment, the filler has a particle size of 5 to 300 μm. By controlling and optimizing the particle size of the filler, the dispersion uniformity of the filler in the liquid crystal polyester compound of the embodiment of the application can be improved, the filler can play the above role, such as improving the synergistic modification effect of the filler and polyphenylene sulfide resin on the base material liquid crystal polyester resin, improving the high hardness and friction resistance of the liquid crystal polyester compound, and improving the surface quality of the product of the liquid crystal polyester compound.
Therefore, the liquid crystal polyester compound in each of the above examples synergistically modifies the liquid crystal polyester resin as a base resin component with the polyphenylene sulfide resin and the filler, and the liquid crystal polyester compound in the examples of the present application has high hardness, a low friction coefficient and excellent fluidity. And the liquid crystal polyester compound of this application embodiment reaches the requirement that camera module applied like this high rigidity, low coefficient of friction and excellent mobility, with its camera module spare part application back, effectively reduces the frictional resistance between the spare part, can show precision and the life who promotes the camera module.
In a second aspect, embodiments of the present application provide a method for preparing a liquid crystal polyester composite as in the above embodiments. The preparation method of the liquid crystal polyester compound comprises the following steps:
Step S01: weighing raw materials of each component according to the component types and contents contained in the liquid crystal polyester compound;
step S02: and carrying out melt mixing extrusion treatment on the weighed raw materials of the components.
The contents of the components and the selected components weighed in the step S01 are the same as the components and contents of the liquid crystal polyester composite, and for the sake of brevity, the raw materials and contents of the components are not repeated herein.
In the examples, before the melt-mixing extrusion treatment of each component raw material, the method also comprises the step of drying each component raw material component. The components are dried firstly, so that the moisture content of the components is reduced, and the interaction of the components in the melting, mixing and extruding process is improved, so that the hardness and the flow property of the obtained liquid crystal polyester compound are improved, and the friction coefficient of a product of the liquid crystal polyester compound is reduced. In the embodiment, the drying treatment temperature is 110-150 ℃ and the drying treatment time is 4-8 h. Through the drying treatment at the temperature and for the time, the full drying treatment is obtained on the basis of ensuring the stable performance of the raw materials of all the components.
In the step S02, the raw materials of the components are fully dispersed and act with each other under the action of high pressure and high heat of melt-kneading extrusion, so as to realize the modification effect on the liquid crystal polyester resin, obtain the target product liquid crystal polyester compound through melt-kneading extrusion, and endow the liquid crystal polyester compound with high hardness and fluidity and low friction coefficient of the product thereof, so as to meet the requirements of camera module application.
In one embodiment, the conditions of the melt-kneading extrusion process in step S02 include: the temperature is 280-380 ℃. The melt kneading extrusion treatment time can be adjusted as required. Through controlling and optimizing the melting, mixing and extruding treatment conditions, all groups are fully and uniformly mixed and fully act in a melting state, the hardness and the flow property of the liquid crystal polyester compound are improved, the friction coefficient of a product of the liquid crystal polyester compound is reduced, the application type of the liquid crystal polyester compound in a camera module is improved, the performance stability of the camera module is improved, and the service life of the camera module is prolonged.
After the melt-kneading extrusion treatment in step S02, the method may further include the subsequent steps of drawing, cooling, granulating, etc. the liquid crystal polyester composite produced by the melt-kneading extrusion treatment.
Therefore, the method for preparing the liquid crystal polyester compound according to the embodiment of the present application directly performs the melt-kneading extrusion treatment on the components according to the types and the proportions of the components contained in the liquid crystal polyester compound, so that the components can be fully dispersed and act with each other, the extruded liquid crystal polyester compound has high hardness and fluidity and low friction coefficient of the product thereof, and the mechanical properties such as hardness and fluidity of the liquid crystal polyester compound can be further improved and the surface property of the product thereof can be improved by controlling and optimizing the content and the types of the components and the process conditions in the preparation process. In addition, the preparation method has easily controlled process, the prepared material has stable performance, and the production cost is effectively reduced.
In a third aspect, based on the liquid crystal polyester compound and the preparation method thereof in the embodiments of the above application, the embodiments of the present application further provide a camera module. The image head module comprises a lens bracket and a carrier for controlling and fixing the lens bracket, and certainly comprises other necessary components, and the connection relationship between the components can be the existing connection relationship, for example, the carrier comprises a ball and a track for bearing and allowing the ball to roll, and the ball is contacted with the lens bracket and controls the movement of the lens bracket. The material of the track and/or the lens holder is the liquid crystal polyester compound in the embodiment of the above application. The track and/or the lens support contained in the camera module are made of the liquid crystal polyester compound according to the embodiment of the application, so that the track and/or the lens support contained in the camera module are high in hardness and low in friction coefficient, the stability of the working performance of the track and/or the lens support is effectively guaranteed, the service life of the track and/or the lens support is prolonged, the stability of the working performance of the carrier and/or the lens support is improved, the accurate control of a lens is improved, and the automatic focusing of the camera module is improved.
The liquid crystal polyester composite and the preparation method thereof are described in detail with reference to specific examples.
Example 1
The embodiment provides a liquid crystal polyester compound and a preparation method thereof. The liquid crystal polyester compound of the embodiment comprises the following components in parts by weight in the following table 1: 68 parts by weight of LCP, 5 parts by weight of PPS, 25 parts by weight of mica and 2 parts by weight of carbon black.
The preparation method of the liquid crystal polyester compound of the embodiment is as follows:
s1, weighing the components according to the raw material components and the content of the liquid crystal polymer in the embodiment;
s2, drying the LCP, the PPS and the filler (mica and carbon black) at 140 ℃ for 6 hours;
s3, putting the dried LCP, the dried PPS and the dried filler into an automatic mixer, and uniformly mixing to obtain a first mixture;
and S4, putting the first mixture into a double-screw extruder for melt mixing, extruding, bracing, cooling and granulating to obtain the liquid crystal polyester compound. Wherein the melt kneading conditions were 330. + -. 20 ℃.
Example 2
The embodiment provides a liquid crystal polyester compound and a preparation method thereof. The liquid crystal polyester compound of the embodiment comprises the following components in parts by weight in the following table 1: 63 parts by weight of LCP, 10 parts by weight of PPS, 25 parts by weight of mica and 2 parts by weight of carbon black.
The preparation method of the liquid crystal polyester compound of the embodiment is as follows:
s1, weighing all the components according to the raw material components and the content of the liquid crystal polymer in the embodiment;
s2, drying the LCP, the PPS and the fillers (mica and carbon black) at 140 ℃ for 6 hours;
s3, putting the dried LCP, PPS and filler into an automatic mixer, and uniformly mixing to obtain a first mixture;
and S4, putting the first mixture into a double-screw extruder for melt mixing, extruding, bracing, cooling and granulating to obtain the liquid crystal polyester compound. Wherein the melt-kneading conditions were 320. + -. 20 ℃.
Example 3
The embodiment provides a liquid crystal polyester compound and a preparation method thereof. The liquid crystal polyester compound of the embodiment comprises the following components in parts by weight in the following table 1: 53 parts by weight of LCP, 20 parts by weight of PPS, 25 parts by weight of mica and 2 parts by weight of carbon black.
The preparation method of the liquid crystal polyester compound of the embodiment is as follows:
s1, weighing the components according to the raw material components and the content of the liquid crystal polymer in the embodiment;
s2, drying the LCP, the PPS and the filler (mica and carbon black) at 140 ℃ for 6 hours;
s3, putting the dried LCP, the dried PPS and the dried filler into an automatic mixer, and uniformly mixing to obtain a first mixture;
And S4, putting the first mixture into a double-screw extruder for melt mixing, and then extruding, bracing, cooling and granulating to obtain the liquid crystal polyester compound. Wherein the melt-kneading conditions were 310. + -. 20 ℃.
Example 4
The embodiment provides a liquid crystal polyester compound and a preparation method thereof. The liquid crystal polyester compound of the embodiment comprises the following components in parts by weight in the following table 1: 68 parts by weight of LCP, 15 parts by weight of PPS, 15 parts by weight of mica and 2 parts by weight of carbon black.
The preparation method of the liquid crystal polyester compound of the embodiment is as follows:
s1, weighing all the components according to the raw material components and the content of the liquid crystal polymer in the embodiment;
s2, drying the LCP, the PPS and the filler (mica and carbon black) at 140 ℃ for 6 hours;
s3, putting the dried LCP, the dried PPS and the dried filler into an automatic mixer, and uniformly mixing to obtain a first mixture;
and S4, putting the first mixture into a double-screw extruder for melt mixing, extruding, bracing, cooling and granulating to obtain the liquid crystal polyester compound. Wherein the melt-kneading conditions were 320. + -. 20 ℃.
Example 5
The embodiment provides a liquid crystal polyester compound and a preparation method thereof. The liquid crystal polyester compound of the embodiment comprises the following components in parts by weight in the following table 1: 68 parts by weight of LCP, 15 parts by weight of PPS, 15 parts by weight of wollastonite and 2 parts by weight of carbon black.
The preparation method of the liquid crystal polyester compound of the embodiment is as follows:
s1, weighing all the components according to the raw material components and the content of the liquid crystal polymer in the embodiment;
s2, drying the LCP, the PPS and the fillers (mica and carbon black) at 140 ℃ for 6 hours;
s3, putting the dried LCP, the dried PPS and the dried filler into an automatic mixer, and uniformly mixing to obtain a first mixture;
and S4, putting the first mixture into a double-screw extruder for melt mixing, extruding, bracing, cooling and granulating to obtain the liquid crystal polyester compound. Wherein the melt-kneading conditions are 320. + -. 20 ℃.
Comparative example 1
The comparative example provides a liquid crystal polyester resin compound, and the liquid crystal polyester compound of the example comprises the following components in parts by weight and contents in table 1: 73 parts by weight of LCP, 0 part by weight of PPS, 25 parts by weight of mica and 2 parts by weight of carbon black. The preparation method refers to the preparation method of example 1.
Comparative example 2
The comparative example provides a liquid crystal polyester resin compound, and the liquid crystal polyester compound of the example comprises the following components in parts by weight and contents in table 1: 68 parts by weight of LCP, 5 parts of elastomer, 25 parts by weight of mica and 2 parts by weight of carbon black. The preparation method refers to the preparation method of example 1.
Comparative example 3
The comparative example provides a liquid crystal polyester resin compound, and the liquid crystal polyester compound of the embodiment comprises the following components in parts by weight in the following table 1: 68 parts by weight of LCP, 5 parts by weight of PPS and 27 parts by weight of glass fibers. The preparation method thereof refers to the preparation method of example 1.
Testing of corresponding Properties
The liquid crystal polyester compounds provided in examples 1 to 5 and the liquid crystal polyester resin compounds provided in comparative examples 1 to 3 were injection-molded using an injection molding machine as injection molding raw materials, respectively, and then the properties thereof were tested and evaluated by the following test standards, respectively, with the test results shown in table 1 below:
(1) hardness test
The hardness test was carried out according to the GB/T230.1 standard.
(2) Flexural strength
Flexural strength measurements were made according to ASTM D-790.
(3) Coefficient of friction
Heat distortion temperature was measured according to ASTM D1894.
TABLE 1
As can be seen from Table 1, the liquid-crystalline polyester composite of example 1 had a coefficient of friction of 0.28 and a Rockwell hardness of 103; the liquid crystal polyester composite of example 2 had a coefficient of friction of 0.27 and a Rockwell hardness of 105; the liquid crystal polyester compound of example 3 had a coefficient of friction of 0.24 and a Rockwell hardness of 110; the liquid crystal polyester composite of example 4 had a coefficient of friction of 0.22 and a Rockwell hardness of 108; the liquid crystal polyester composite of example 5 had a coefficient of friction of 0.22 and a Rockwell hardness of 109; the liquid crystal polyester composite of comparative example 1 had a coefficient of friction of 0.30 and a Rockwell hardness of 101; the liquid crystal polyester composite of comparative example 2 had a coefficient of friction of 0.31 and a Rockwell hardness of 93. Therefore, the friction coefficient of each liquid crystal polyester compound in the embodiment of the application is obviously lower than that of the liquid crystal polyester compound in the comparative example, and the Rockwell hardness of each liquid crystal polyester compound in the embodiment of the application is obviously higher than that of the liquid crystal polyester compound in the comparative example, so that the hardness of the liquid crystal polyester compound in the embodiment of the application is obviously improved, the friction coefficient of the surface of a product is relatively small, and the surface quality is obviously improved.
Further analysis revealed that the liquid crystal polyester composites (e.g., examples 1 to 5) modified by adding PPS and a filler had increased hardness as the ratio of PPS increased, but had decreased flexural strength as the ratio of PPS increased. When the friction coefficient and the hardness of the liquid crystal polyester compound (comparative example 1) obtained without adding PPS are lower than those of the liquid crystal polyester compound (comparative example 1) of the examples 1-5, and PPS is changed into an elastomer (comparative example 2), comparison of data of the comparative example 2 and the liquid crystal polyester compound of the example 1 shows that all performances of the example 1 are advantageous. Comparative example 3 has excellent bending strength, but its friction coefficient is also significantly increased, and thus, when a fiber is used as a filler, the liquid crystal polyester composite is very easily abraded, reducing the applicability of the liquid crystal polyester composite as a part for preparing a camera module. Therefore, in the embodiment, 5-20% of PPS and 10-30% of mineral filling are added into the liquid crystal polyester material, so that the hardness of the liquid crystal polyester compound can be improved, the friction is reduced, after the liquid crystal polyester compound is applied to the camera module, the friction resistance between parts of the camera module can be reduced, the focusing accuracy of the camera module is improved, and the service life of the camera module is prolonged.
The principle and embodiments of the present application are explained in detail with reference to specific embodiments, which are only used to help understanding the method and the core idea of the present application, and the above description is only a preferred embodiment of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The liquid crystal polyester compound is characterized by comprising the following components in parts by weight:
50-80 parts of liquid crystal polyester resin
2-25 parts of polyphenylene sulfide resin
8-50 parts of a filler;
the liquid crystal polyester compound is used for preparing parts of the camera module.
2. The liquid crystalline polyester composite of claim 1, wherein: the parts comprise a carrier for controlling and fixing a lens, wherein the carrier comprises a ball and a track for bearing and allowing the ball to roll, and the material of the track is the liquid crystal polyester compound.
3. The liquid crystalline polyester composite of claim 1, wherein: the monomer of the liquid crystal polyester resin comprises two or more than two of HBA, HNA, TPA, IPA, BP and APAP; and/or
The number average molecular weight of the liquid crystal polyester resin is 10000-30000.
4. The liquid crystalline polyester composite of claim 1, wherein: the LCP resin comprises at least one of Tape I type or Tape II type.
5. The liquid crystalline polyester composite of any of claims 1 to 4, wherein: the filler comprises at least one of mica, wollastonite, talc, barium sulfate, whiskers and carbon black.
6. The liquid crystalline polyester composite of claim 1, wherein: the particle size of the filler is 5-300 microns.
7. A preparation method of a liquid crystal polyester compound comprises the following steps:
weighing the raw materials of the components according to the component types and contents of the liquid crystal polyester compound as defined in any one of claims 1 to 6;
and carrying out melt mixing extrusion treatment on the weighed raw materials of the components.
8. The method of claim 7, wherein: the conditions of the melt-kneading extrusion treatment include: the temperature is 280-380 ℃.
9. The method of claim 7, wherein: before the raw materials of each component are subjected to the melt mixing extrusion treatment, the method also comprises the step of drying each component; and/or
After the melt-kneading extrusion treatment, the method further comprises the steps of carrying out bracing treatment, cooling treatment and granulation treatment on the liquid crystal polyester compound extruded by the melt-kneading extrusion treatment.
10. A camera module comprises a lens support and a carrier used for controlling and fixing the lens support, wherein the carrier comprises a ball and a track used for bearing and allowing the ball to roll, the ball is in contact with the lens support and controls the movement of the lens support, and the camera module is characterized in that: the material of the track and/or the lens holder is the liquid crystal polyester composite of claim 1 or the liquid crystal polyester composite prepared by the preparation method of any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210392455.7A CN114752186A (en) | 2022-04-14 | 2022-04-14 | Liquid crystal polyester compound applied to camera module parts and preparation method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1025402A (en) * | 1996-07-09 | 1998-01-27 | Sumitomo Chem Co Ltd | Liquid-crystal polyester resin composition |
| CN106674938A (en) * | 2016-12-29 | 2017-05-17 | 江苏沃特特种材料制造有限公司 | Dust-free liquid crystal polyester compound and preparation method and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1025402A (en) * | 1996-07-09 | 1998-01-27 | Sumitomo Chem Co Ltd | Liquid-crystal polyester resin composition |
| CN106674938A (en) * | 2016-12-29 | 2017-05-17 | 江苏沃特特种材料制造有限公司 | Dust-free liquid crystal polyester compound and preparation method and application thereof |
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