CN112251008B - Chemical-resistant anti-bending polycarbonate composite material and preparation and application thereof - Google Patents
Chemical-resistant anti-bending polycarbonate composite material and preparation and application thereof Download PDFInfo
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- CN112251008B CN112251008B CN202011037518.4A CN202011037518A CN112251008B CN 112251008 B CN112251008 B CN 112251008B CN 202011037518 A CN202011037518 A CN 202011037518A CN 112251008 B CN112251008 B CN 112251008B
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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
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/18—Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment
- H04M1/185—Improving the shock resistance of the housing, e.g. by increasing the rigidity
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/53—Core-shell polymer
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention belongs to the field of composite materials, and discloses a chemical-resistant and bending-resistant polycarbonate composite material for injection molding and preparation and application thereof. The composite material comprises the following components in percentage by weight: 85% -98% of polycarbonate resin; 0.5 to 5 percent of glass powder; 3% -7% of core-shell structure toughening agent; 0.05 to 0.5 percent of antioxidant; 0.1 to 2.0 percent of release agent. According to the invention, by adding the glass powder and the core-shell structure toughening agent, the chemical resistance of the welding line part of the workpiece can be greatly improved, the bending resistance of the product after a spraying process is greatly improved, cracking is reduced, and the yield is improved.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a chemical-resistant and bending-resistant polycarbonate composite material as well as preparation and application thereof.
Background
Polycarbonate (PC) is widely used as a mobile phone rear shell material due to good impact resistance, and has the advantages of portability, drop resistance, good dielectric property and the like. With the popularization of large screens, the difference of the front of the mobile phone is smaller and smaller, and in order to meet the requirements of individuation and differentiation, mobile phone manufacturers can only make articles on the back shell, so that various appearance effects are realized. In order to achieve various appearance effects, PC is often required to be painted and surface treated. Due to poor resistance of PC, various chemical agents used in spraying and surface treatment have a significant effect on PC, resulting in a decrease in toughness of PC, direct cracking, or bending cracking. Such cracking tends to occur in the vicinity of the weld line, mainly for two reasons, namely that the vicinity of the weld line itself is weaker than others and has poor toughness. And secondly, the part near the welding line is always provided with stronger residual stress and is more easily attacked by chemical reagents. Particularly, as the weight of 5G mobile phones increases and the appearance is extremely sought, stronger chemical agents are required for surface treatment. The PC material suitable for the past has high reject ratio under the new toughness and bending requirements, and is difficult to meet the requirements.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention mainly aims to provide the chemical-resistant and bending-resistant polycarbonate composite material, which is added with glass powder and a toughening agent with a core-shell structure with a certain size, so that the chemical resistance of a welding line part of a product can be greatly improved, the bending resistance of the product after a spraying process is greatly improved, cracking is reduced, and the yield is improved.
The invention also aims to provide a preparation method of the chemical-resistant and bending-resistant polycarbonate composite material.
The invention further aims to provide application of the chemical-resistant and bending-resistant polycarbonate composite material.
The purpose of the invention is realized by the following scheme:
a chemical-resistant and bending-resistant polycarbonate composite material comprises the following components in percentage by weight:
85% -98% of polycarbonate resin;
0.5 to 5 percent of glass powder;
core-shell structure toughener 0.5% -10%;
0.05 to 0.5 percent of antioxidant;
0.1 to 2.0 percent of release agent;
the weight percentage of the polycarbonate resin is preferably 88-95%;
the glass powder is preferably surface modified glass powder, wherein the surface modified compound is polyolefin, and is preferably Chongqing International 415A-14C; the D50 of the glass powder is less than 5um; preferably less than 2um;
the weight percentage of the glass powder is preferably 1-3%, and more preferably 2%;
the D50 of the core-shell structure toughening agent is more than 300nm;
the content of the rubber phase in the core-shell structure toughening agent is more than 70 percent.
The weight percentage of the core-shell structure toughening agent is preferably 3-7%.
The core-shell structure toughening agent preferably takes polydimethylsiloxane as a core and polymethyl methacrylate as a shell; more preferably mitsubishi chemical S2100.
The antioxidant is hindered phenol antioxidant or phosphite antioxidant, and the release agent is stearate.
The preparation method of the chemical-resistant and bending-resistant polycarbonate composite material comprises the following steps: the components are mixed according to the proportion, and then are extruded and granulated by an extruder to obtain the bending-resistant polycarbonate composite material for injection molding, wherein the granulation temperature is 230-300 ℃.
The chemical-resistant and bending-resistant polycarbonate composite material is applied to the preparation of the rear shell of the mobile phone.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the chemical-resistant and bending-resistant polycarbonate composite material disclosed by the invention can greatly improve the chemical resistance of the welding line part of a workpiece, greatly improve the bending resistance of the product after a spraying process, reduce cracking and improve the yield. The preparation method is simple and feasible, and is suitable for large-scale production and application.
Drawings
FIG. 1 is an illustration of the cracking of reference 1 article after the spray coating process in example 1.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto. The examples, in which specific conditions are not specified, were conducted under 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. PC is TARFLON IR1900, glass powder is ground by Chongqing International 415A-14C, and D50 is 1.2 μm. Core-shell toughener 1 is Mitsubishi chemical S2001, core-shell toughener 2 is Mitsubishi chemical S2100, core-shell toughener 3 is Dow chemical EXL2691J, and core-shell toughener 4 is Jinhuilai HR181.
Example 1
The components in table 1 were mixed in a mixer in the weight ratios shown in table 1, and then pelletized with a twin-screw extruder at a temperature of 240 ℃ to 280 ℃. The obtained particles are injected on a real mobile phone mold, a sample after injection molding is divided into two parts, and one part is directly subjected to bending test (the test mode is that a workpiece is bent in the same direction by taking the central line of the long edge as a symmetry axis, and the bending angle when fracture occurs is recorded). The other part was subjected to spray test. The spraying test was carried out by spraying Tiantashui on one side of the article using a Taiwan blue HD-130 spray gun at a speed of 2.5cm/s with the nozzle 2cm from the surface of the article. And (3) standing for 24 hours after spraying, observing whether the workpiece cracks, if not, carrying out bending test on the sprayed workpiece, and recording the bending angle when the workpiece cracks. When bending test is carried out, 3 samples are tested for each sample, and an average value is taken. The test results are shown in table 1.
TABLE 1 Experimental data for different core-shell tougheners
The parameters of the core-shell toughener in table 1 are shown in table 2.
TABLE 2 core-shell toughener parameter table
From the data in table 1, it can be seen that even pure PC has very good bending properties when no spraying is performed. However, when the parts are sprayed, pure PC is directly broken at the weld line. After the core-shell toughening agent is added, although the impact strength data of the material is reduced, the bending performance before and after spraying is improved to a certain degree, and the improvement degree is further improved along with the increase of the toughening agent amount. Meanwhile, different toughening agents have different bending resistance, and the toughening agent 2 has the best effect. However, it can also be seen that even with 7 parts of toughener 2, the post-spray bending resistance is still only 50 degrees, which does not reach the pre-PC spray bending resistance level (90 degrees). Although the bending resistance can be further improved by continuing to increase the content of the toughening agent, the toughening agent is generally very expensive and economically unacceptable.
Example 2
The components in table 3 were mixed in a mixer in the weight ratios indicated and granulated with a twin-screw extruder at a granulation temperature of 240 ℃ to 280 ℃. The obtained particles are injected on a real mobile phone mold, a sample after injection molding is divided into two parts, one part is directly subjected to bending test (the test mode is that a workpiece is bent in the same direction by taking the central line of the long edge as a symmetry axis, and the bending angle when fracture occurs is recorded), and the bending angle when fracture occurs is recorded. And spraying the other part of the workpiece, standing for 24 hours after spraying, observing whether the workpiece cracks, if not, carrying out a bending test on the sprayed workpiece, and recording the bending angle when the workpiece cracks. When bending test is carried out, 3 samples are tested for each sample, and an average value is taken. The test results are shown in table 3.
TABLE 3 Experimental data for different combinations of core-shell toughening agents with glass powder
It can be seen from the data in table 3 that when the glass powder is used alone, the impact strength, the chemical resistance and the bending resistance of the material are both reduced to a certain extent, and when the core-shell toughening agent and the glass powder are used together, the chemical resistance and the bending resistance of the material are both improved, and particularly when the core-shell toughening agent 2 is used, even if only 3 parts of the toughening agent is used, the bending fracture angle after spraying reaches 100 degrees and far exceeds those of other toughening agents.
Example 3
The components in table 4 were mixed in a mixer in the weight ratios indicated, and then granulated with a twin-screw extruder at a granulation temperature of 240 ℃ to 280 ℃. The obtained particles are injected on a real mobile phone mold, a sample after injection molding is divided into two parts, one part is directly subjected to bending test (the test mode is that a workpiece is bent in the same direction by taking the central line of the long edge as a symmetry axis, and the bending angle when fracture occurs is recorded), and the bending angle when fracture occurs is recorded. The other part was subjected to spray test. And in the spraying test, spray the Tianpan water on one surface of the workpiece by using a spray gun, standing for 24 hours after spraying, observing whether the workpiece cracks, if not, carrying out bending test on the sprayed workpiece, and recording the bending angle when the workpiece cracks. When bending test is carried out, 3 samples are tested by each sample, and an average value is taken. The test results are shown in table 4.
TABLE 4 Experimental data for the addition of toughener 2 and glass powder
As can be seen from the data in Table 4, when the content of the toughening agent is kept unchanged and the glass powder is added, the bending resistance of the material tends to be increased and then decreased, and the glass powder content is 1% -3%, so that the material has the best bending resistance. When the content of the glass powder is kept unchanged and the toughening agent is added, the bending resistance of the material is continuously improved, and when the content of the toughening agent is more than 3, the fracture angle is greatly improved to be more than 90 degrees, and the content of 3 to 7 parts is preferably considered in consideration of cost factors.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. The chemical-resistant and bending-resistant polycarbonate composite material is characterized by comprising the following components in percentage by weight:
85% -98% of polycarbonate resin;
0.5 to 5 percent of glass powder;
core-shell structure toughener 0.5% -10%;
0.05 to 0.5 percent of antioxidant;
0.1 to 2.0 percent of release agent;
the glass powder is surface modified glass powder, wherein the surface modified compound is polyolefin;
the D50 of the glass powder is less than 5 μm.
2. The chemical-resistant, bend-resistant polycarbonate composite of claim 1, wherein:
the D50 of the core-shell structure toughening agent is more than 300nm.
3. The chemical-resistant, bend-resistant polycarbonate composite of claim 1, wherein:
the rubber phase content of the core-shell structure toughening agent is more than 70%.
4. The chemical-resistant, bend-resistant polycarbonate composite of claim 1, wherein:
the chemical components of the core-shell structure toughening agent are polymethyl siloxane as a core and methyl methacrylate as a shell.
5. The chemical-resistant, bend-resistant polycarbonate composite of claim 1, wherein:
the glass powder is Chongqing International 415A-14C;
the core-shell structure toughening agent is Mitsubishi chemical S2100.
6. The chemical-resistant, bend-resistant polycarbonate composite of claim 1, wherein:
the antioxidant is hindered phenol antioxidant or phosphite antioxidant, and the release agent is stearate.
7. The bend-resistant polycarbonate composite material for injection molding according to claim 1, characterized by comprising the following components in percentage by weight:
88% -95% of polycarbonate resin;
1% -3% of glass powder;
3% -7% of core-shell structure toughening agent;
0.05 to 0.5 percent of antioxidant;
0.1 to 2.0 percent of release agent.
8. A preparation method of the chemical-resistant and bending-resistant polycarbonate composite material as claimed in any one of claims 1 to 7, characterized by comprising the following steps: the components are mixed according to the proportion, and then are extruded and granulated by an extruder to obtain the bending-resistant polycarbonate composite material for injection molding, wherein the granulation temperature is 230-300 ℃.
9. Use of the bend-resistant polycarbonate composite material for injection molding according to any one of claims 1 to 7 in preparation of a mobile phone rear shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011037518.4A CN112251008B (en) | 2020-09-28 | 2020-09-28 | Chemical-resistant anti-bending polycarbonate composite material and preparation and application thereof |
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| CN202011037518.4A CN112251008B (en) | 2020-09-28 | 2020-09-28 | Chemical-resistant anti-bending polycarbonate composite material and preparation and application thereof |
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| CN112251008A CN112251008A (en) | 2021-01-22 |
| CN112251008B true CN112251008B (en) | 2023-01-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000007904A (en) * | 1998-06-25 | 2000-01-11 | Mitsubishi Eng Plast Corp | Molded body for OA equipment parts with excellent vibration damping properties |
| CN105153662B (en) * | 2015-07-23 | 2017-10-17 | 深圳华力兴新材料股份有限公司 | A kind of polycarbonate composite material of glass fiber reinforcement and preparation method thereof |
| CN108192312A (en) * | 2018-01-12 | 2018-06-22 | 中山长虹电器有限公司 | The highlighted of metal/pearly-lustre illusion-colour texture with exquisiteness exempts to spray polycarbonate composite material and preparation method thereof |
| CN110358277A (en) * | 2019-06-21 | 2019-10-22 | 东莞市广正模具塑胶有限公司 | A kind of enhancing is flexible to exempt to spray makrolon material, mobile phone shell and preparation method thereof |
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