CN114031917B - PC material with low warpage and good appearance as well as preparation method and application thereof - Google Patents
PC material with low warpage and good appearance as well as preparation method and application thereof Download PDFInfo
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- CN114031917B CN114031917B CN202111342868.6A CN202111342868A CN114031917B CN 114031917 B CN114031917 B CN 114031917B CN 202111342868 A CN202111342868 A CN 202111342868A CN 114031917 B CN114031917 B CN 114031917B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
- C08K7/20—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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Abstract
The invention relates to a PC material with low warpage and good appearance, a preparation method and application thereof. The PC material with low warpage and good appearance comprises polycarbonate, glass fiber, modified glass beads and the like. The PC material with low warpage and good appearance provided by the invention utilizes the modified glass beads to reduce warpage, and meanwhile, the influence on gloss is avoided, and the PC material with low warpage and good appearance has excellent high gloss, low warpage and good color protection performance, can effectively improve appearance defects, and can be widely applied to large-size thin-wall products (such as televisions and the like) and products with high size precision.
Description
Technical Field
The invention belongs to the technical field of engineering plastics, and particularly relates to a PC material with low warpage and good appearance, a preparation method and application thereof.
Background
The Polycarbonate (PC) is engineering plastic with excellent performance, has good comprehensive performance, high mechanical strength, good impact resistance and toughness, stable size, better heat resistance and good electrical insulation, and has wide application in the fields of household appliances, digital products, IT products and the like. As the aesthetic demands of the end-user increase, the corresponding plastic materials also need to have good color stabilization to maintain good appearance requirements.
In general, the PC material performance is improved by glass fiber reinforced fibers, so that the comprehensive performance of the composite material is improved, the strength is high, the temperature resistance is good, and the composite material is widely used in the television industry as a classical material of a front frame. As television sets become larger and thinner, the size requirements for materials are also increasing. However, the glass fibers are oriented in the flow direction in the finished piece, so that the shrinkage rate of the finished piece in the flow direction and the shrinkage rate of the finished piece in the vertical flow direction are greatly different, warpage is easy to generate, and in addition, as the surface of the glass fibers is not smooth, floating fibers are easy to generate in the injection molded finished piece, and a high-gloss product cannot be obtained.
How to improve the dimensional stability and maintain high gloss of a material while maintaining performance is a hot spot problem.
CN102952376a discloses a low-warpage glass fiber reinforced PET/PBT/PC alloy material, which has the effect of reducing warpage by adding mineral fillers (such as solid glass beads) with high shape symmetry to reduce anisotropy caused by glass fiber orientation. The material has the characteristics of high toughness, high rigidity, low warpage, high fluidity, good dimensional stability, high thermal deformation temperature and the like, and can be used for injection molding of vehicle doors, vehicle body vertical plates, wind shields, tire guard plates and even the whole vehicle body due to the excellent comprehensive performance.
CN109337302a discloses an ultralow-warpage high-impact glass fiber reinforced PBT/PC/ABS ternary alloy material and a preparation method thereof, wherein talcum powder, glass beads and mica powder mineral fillers are added to improve warpage.
However, in these technical methods, it is difficult to secure a good appearance while achieving low warpage and high strength by compounding the ore powder, and the addition of the filler, the non-uniformity of the filler, results in failure to obtain a high gloss product.
Therefore, developing a PC material with low warpage and good appearance has important research significance and application value.
Disclosure of Invention
The invention aims to overcome the defect or defect that the PC material in the prior art cannot achieve both low warpage and good appearance, and provides the PC material with low warpage and good appearance. The PC material with low warpage and good appearance provided by the invention utilizes the modified glass beads to reduce warpage, and meanwhile, the influence on gloss is avoided, and the PC material with low warpage and good appearance has excellent high gloss, low warpage and good color protection performance, can effectively improve appearance defects, and can be widely applied to large-size thin-wall products and high-size precision products.
Another object of the present invention is to provide a method for producing the PC material with a low warpage and good appearance.
The invention also aims to provide the application of the PC material with low warpage and good appearance in preparing large-size thin-wall products and high-size precision products.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the PC material with low warpage and good appearance comprises the following components in parts by weight:
100 parts of polycarbonate;
5-50 parts of glass fiber;
2-50 parts of modified glass beads;
the modified glass beads are obtained by modifying maleic anhydride grafted acrylic acid polymer; the pH value of the modified glass beads is 6-8.
The inventor of the invention finds through repeated research that adding modified glass beads into a PC resin system can utilize isotropy of the glass beads, change orientation of glass fibers in a PC material, and reduce orientation degree of the glass fibers along a flowing direction, thereby reducing shrinkage difference between a flowing direction of a product and a vertical flowing direction and reducing warpage. In addition, the conventional glass beads have stronger alkalinity (the pH value is generally 9-11), the terminal group structure of the PC resin is easy to hydrolyze at high temperature, and the degradation of the PC resin is accelerated especially under alkaline conditions, so that the appearance is affected. According to the invention, the maleic anhydride grafted acrylic acid polymer (maleic anhydride grafted EBA) is used for modifying the glass beads, on one hand, the maleic anhydride grafted acrylic acid polymer can react with the alkaline groups on the surfaces of the glass beads, the pH of the glass beads is regulated, the alkaline environment of a PC resin system is improved, and the degradation of PC is reduced; on the other hand, the acrylic acid structure in the maleic anhydride grafted acrylic acid polymer has good compatibility with PC, and does not negatively influence the appearance of PC, thereby obtaining a product with good appearance and high performance.
If the glass beads are modified by directly using common organic acids (such as titanic acid, acrylic acid, oleic acid and butenedioic acid), although the organic acids can also be used for adjusting the pH of the glass beads by reacting carboxyl groups with alkaline groups on the surfaces of the glass beads, unsaturated double bonds with high reactivity are simultaneously introduced on the surfaces of the glass beads, and when the glass beads are mixed with matrix resin for processing, shaping and storage, free radicals generated by decomposition of the matrix resin react with the unsaturated double bonds on the surfaces of the glass beads due to the action of heat or mechanical shearing to form a chemical crosslinking structure, and the excessive crosslinking can lead to reduced heat resistance and deteriorated appearance. Although the maleic anhydride grafted acrylic polymer also contains unsaturated double bonds, the activity of the unsaturated double bonds in the grafted acrylic structure is very low, and the formation of a chemical crosslinking structure can be avoided.
The PC material with low warpage and good appearance provided by the invention utilizes the modified glass beads to reduce warpage, and meanwhile, the influence of the glass beads on the gloss is avoided, and the PC material with low warpage and good appearance has excellent high gloss, low warpage and good color protection performance, can effectively improve appearance defects, and can be widely applied to large-size thin-wall products (such as televisions and the like) and products with high size precision.
Preferably, the PC material with low warpage and good appearance comprises the following components in parts by weight:
100 parts of polycarbonate;
6-40 parts of glass fiber;
5-40 parts of modified glass beads.
Preferably, the pH of the modified glass beads is 6.5-7.5.
Preferably, the grafting rate of the maleic anhydride in the maleic anhydride grafted acrylic polymer is 0.8 to 1.2 percent
The grafting ratio is measured as follows:
(1) Weighing 0.5 g of sample, adding 80ml of dimethylbenzene for heating reflux, cooling to 90 ℃ after the grafted sample is completely dissolved, transferring 0.005mol/L potassium hydroxide-ethanol solution, and then continuing heating reflux for 30min;
(2) Taking out the fully dissolved and reacted solution, naturally cooling, then dropwise adding 2 drops of phenolphthalein, and titrating the refined solution to a terminal point by using 0.01mol/L hydrochloric acid-propanol solution;
(3) The grafting ratio of the grafted sample was calculated using the following formula:
C％＝M*[C1(V1-△V)-V2C2]/2m
wherein:
m: the mass of the actually weighed grafted sample is expressed in grams,
v1: the volume of the removed potassium hydroxide-ethanol solution is in milliliters,
c1: concentration of potassium hydroxide-ethanol standard solution;
v2: the volume of the hydrochloric acid-propanol solution is in milliliters;
c2: concentration of hydrochloric acid-propanol solution;
m: the molar mass of maleic anhydride in grams per mole.
Preferably, the modified glass beads are prepared by the following steps: mixing glass beads and maleic anhydride grafted acrylic polymer, obtaining the product.
More preferably, the weight ratio of the glass beads to the maleic anhydride-grafted acrylic polymer is (20-40): 1, preferably (30-35): 1.
Preferably, the polycarbonate is double A type polycarbonate, the weight average molecular weight is 18000-40000, and the gloss is more than or equal to 80 percent according to a 60-degree method.
Gloss was measured according to the 60℃method in GB8807-88 standard.
Preferably, the glass fibers are made from alkali-free aluminoborosilicate glass having a diameter of 8 to 14 μm.
Preferably, the low warpage good appearance PC material further comprises other auxiliary agents such as antioxidants, flame retardants, anti-dripping agents, lubricants, mold release agents, plasticizers, fillers, antistatic agents, antibacterial agents or colorants, etc.
The other auxiliary agents are all conventional in the field, and the dosage is also conventional.
Specifically, the antioxidants can be antioxidant 1076, antioxidant 1010, antioxidant 2246, antioxidant 245, antioxidant 168, antioxidant B-CAP, antioxidant PEP-36, antioxidant S-680 and the like, and the addition amount of the antioxidants is 0.08-0.6 part.
The flame retardant can be phosphate flame retardant, sulfonate flame retardant, brominated polycarbonate and the like, and the addition amount of the flame retardant is 0.1-30 parts.
The anti-dripping agent can be polytetrafluoroethylene anti-dripping agent, and the adding amount of the anti-dripping agent is 0.1-1 part.
The lubricant can be polytetrafluoroethylene lubricant, polyethylene epitaxial lubricant and silicone lubricant, and the addition amount of the lubricant is 0-1 part.
The release agent can be PPA release agent, montan wax release agent, silicon release agent, etc., and the addition amount is 0-2 parts
The filler can be talcum powder, kaolin, clay, whisker, diatomite and the like; the filler may be not subjected to any surface treatment, but may be subjected to a coating treatment, such as alkyl surface coating, epoxy surface treatment, amide surface treatment, hydroxy silicone oil, alkylsilane, methoxysilane, sulfonic acid group, etc., and the amount thereof added is 0.1 to 50 parts.
The antistatic agent can be polyether or mono Gan Zhilei antistatic agent, and the addition amount of the antistatic agent is 0.1-30 parts.
The antibacterial agent can be silver ion antibacterial agent, acyl aniline, imidazole, thiazole, isothiazolone derivative, quaternary ammonium salt, bipyridyl, phenol, etc., and the addition amount is 0.1-5 parts.
The colorant can be carbon black, titanium dioxide, phthalocyanine blue, anthraquinone red and other substances, and the addition amount of the colorant is 0.1-5 parts.
The preparation method of the PC material with low warpage and good appearance comprises the following steps: and mixing the polycarbonate, the glass fiber and the modified glass beads, carrying out melt extrusion, and granulating to obtain the PC material with low warpage and good appearance.
Preferably, the preparation method of the thin-wall flame-retardant low-shrinkage polycarbonate material comprises the following steps: mixing polycarbonate, glass fiber, modified glass beads and other auxiliary agents (if any) in a high-speed mixer; then melting and extruding in a double-screw extruder, and granulating to obtain the PC material with low warpage and good appearance; the length-diameter ratio of the twin-screw extruder is 40:1-70:1, and the screw temperature is 270-290 ℃.
The application of the preparation method of the PC material with low warpage and good appearance in the preparation of large-size thin-wall products (such as televisions) and high-size precision products is also within the protection scope of the invention.
It should be understood that large-sized thin-walled articles in the present invention refer to articles having dimensions above 41 inches and thicknesses below 3 mm.
Compared with the prior art, the invention has the following beneficial effects:
the PC material with low warpage and good appearance provided by the invention utilizes the modified glass beads to reduce warpage, and meanwhile, the influence on gloss is avoided, and the PC material with low warpage and good appearance has excellent high gloss, low warpage and good color protection performance, can effectively improve appearance defects, and can be widely applied to large-size thin-wall products (such as televisions and the like) and products with high size precision.
Detailed Description
The invention is further illustrated below with reference to examples. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. The experimental procedures in the examples below, without specific details, are generally performed under conditions conventional in the art or recommended by the manufacturer; the raw materials, reagents and the like used, unless otherwise specified, are those commercially available from conventional markets and the like. Any insubstantial changes and substitutions made by those skilled in the art in light of the above teachings are intended to be within the scope of the invention as claimed.
The reagents selected for the examples and comparative examples of the present invention are described below:
polycarbonate # 1: aromatic polycarbonate having a weight average molecular weight of 19000, which is shiny in japan, has a gloss of 89% as measured by the 60 ° method of the GB8807-88 standard;
polycarbonate # 2: an aromatic polycarbonate having a weight average molecular weight of 42000, which is shiny in Japan and has a gloss of 88% measured according to the 60℃method of GB 8807-88;
glass fiber # 1: the diameter is 11 mu m, and the manufacturer is PPG;
glass fiber # 2: the diameter is 3.0 mu m, and the manufacturer is a boulder glass fiber;
modified glass bead 1#: ph=6, homemade, specific preparation process as follows: the glass beads 1# and the maleic anhydride grafted acrylic polymer 1# are uniformly mixed according to the weight ratio of 20:1.
Modified glass bead # 2: pH 7, self-making, and the specific preparation process is as follows: the glass beads 1# and the maleic anhydride grafted acrylic polymer 1# are uniformly mixed according to the weight ratio of 30:1.
Modified glass bead 3#: ph=7.8, homemade, specific preparation process as follows: the glass beads 1# and the maleic anhydride grafted acrylic acid polymer 1# are uniformly mixed according to the weight ratio of 40:1.
Modified glass beads 4#: ph=7, homemade, specific preparation process as follows: the glass beads 1# and the maleic anhydride grafted acrylic acid polymer 2# are uniformly mixed according to the mass ratio of 20:1.
Modified glass bead 5#: ph=7, homemade, specific preparation process as follows: the glass beads 2# and the maleic anhydride grafted acrylic polymer 1# are uniformly mixed according to the mass ratio of 25:1.
Modified glass beads 6#: pH 7, self-making, and the specific preparation process is as follows: glass bead 1# and acrylic acid are mixed uniformly according to the mass ratio of 35:1.
Modified glass beads # 7: the pH value is 5.5, the preparation process is as follows: glass bead 1# and maleic anhydride grafted acrylic polymer 1# are mixed uniformly according to the mass ratio of 50:1.
Wherein, the glass bead is No. 1, 050-20-215, SOVITEC, and the pH is 9;
glass bead No. 2, glass bead, holly, pH 10;
maleic anhydride grafted acrylic polymer # 1, EEA 4700, alcma, maleic anhydride grafting ratio of 1.3%;
maleic anhydride grafted acrylic acid polymer # 2, EBA a560, dupont, maleic anhydride grafting 0.8%;
acrylic acid, aladine;
other auxiliary agents, antioxidants, IRGANOX 1076, BASF.
The PC materials of the examples and comparative examples of the present invention were prepared by the following procedure:
weighing the raw materials according to the requirements, and mixing in a high-speed mixer to obtain a uniformly mixed material; and (3) putting the uniformly mixed materials into a double-screw extruder, extruding and granulating after mixing, melting and homogenizing, and cooling to obtain the PC material. The length-diameter ratio of the twin-screw extruder is 60:1, and the screw temperature is 270-290 ℃.
The PC resin materials of the examples and comparative examples of the present invention were tested as follows:
(1) Gloss test method: according to the GB8807-88 standard, the gloss appearance name is measured by 60 DEG method: miniature triangle gloss appearance, model: BYK4446;
determination criteria: the gloss was averaged over 9 points in a nine-grid fashion on a 100mm x 1mm template.
Wherein, the grade of glossiness is rated by the average deviation value of 9 points, the average deviation is less than 10, and the grade is excellent; the average deviation is less than or equal to 10 and less than 40, and the evaluation is good; the average deviation is more than or equal to 40, and the difference is rated.
The average deviation is calculated by the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,
for average deviation, n is 9, |d i I is the deviation of each point, and I d i Gloss at a point-average gloss at 9 points.
(2) The appearance defect testing method comprises the following steps:
the polycarbonate composition particles are added into an injection molding machine, and heat retention is carried out for 10min at the temperature of 270-290 ℃ to observe the pattern situation of the sample plate surface of 100mm x 1 mm.
Determination criteria: and (5) observing the degree and the length of the material flower density, and determining the appearance defect level. Overall defect free, rated grade 1; the coverage area of the material flower is less than 1/4, and the evaluation is grade 2; the flower coverage area is 1/4-1/2 (including 1/4 and not including 1/2) and is rated as grade 3; the overall material flower was rated as grade 4.
(3) The warping degree testing method comprises the following steps: the warping performance adopts a quadratic element to observe the deviation distance, and is characterized by the maximum warping degree, and the calculation formula is as follows:
γ＝h/l*a。
h is the maximum distance between the workpiece and the reference object workpiece, l is the projection length of the workpiece on the reference object, and a is the length of the workpiece perpendicular to the direction of the reference object.
Examples 1 to 12
This example provides a series of low warpage good appearance PC materials with the formulations as shown in table 1.
Table 1 formulations (parts) of examples 1 to 12
| Examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Polycarbonate 1# | 100 | 100 | 100 | 100 | 100 | / | 100 | 100 | 100 | 100 | 100 | 100 |
| Polycarbonate 2# | / | / | / | / | / | 100 | / | / | / | / | / | / |
| Glass fiber 1 #) | 40 | 5 | 20 | 30 | 50 | 40 | / | 40 | 40 | 40 | 40 | 40 |
| Glass fiber 2 #) | / | / | / | / | / | / | 40 | / | / | / | / | / |
| Modified glass bead 1 #) | / | / | / | / | / | / | / | 6 | / | / | / | / |
| Modified glass bead 2 #) | 6 | 45 | 30 | 5 | 2 | 6 | 6 | / | / | / | / | 6 |
| Modified glass bead 3 #) | / | / | / | / | / | / | / | / | 6 | / | / | / |
| Modified glass bead 4 #) | / | / | / | / | / | / | / | / | / | 6 | / | / |
| Modified glass bead 5# | / | / | / | / | / | / | / | / | / | 6 | / | |
| Other functional aids | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | / |
Comparative examples 1 to 4
This comparative example provides a series of PC resin materials with the formulations shown in table 2.
Table 2 formulations (parts) of comparative examples 1 to 4
| Component (A) | Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Polycarbonate 1# | 100 | 100 | 100 | 100 | 100 |
| Glass fiber 1 #) | 40 | 40 | 40 | 40 | 40 |
| Modified glass bead 2 #) | 6 | / | / | / | / |
| Modified glass bead 6 #) | / | / | 6 | / | / |
| Modified glass bead 7 #) | / | / | / | 6 | / |
| Glass bead 1 #) | / | / | / | / | 6 |
| Other processing aids | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
The PC resin materials provided in each of the examples and comparative examples were tested for their properties according to the performance test methods described above, and the results are shown in table 3.
TABLE 3 Performance test results of PC materials provided in examples 1 to 12 and comparative examples 1 to 4
| Performance of | Gloss level | Appearance defect | Warp degree (mm) |
| Example 1 | Excellent and excellent properties | Level 1 | 0.7 |
| Example 2 | Good quality | Level 1 | 1.3 |
| Example 3 | Excellent and excellent properties | Level 1 | 0.8 |
| Example 4 | Excellent and excellent properties | Level 1 | 1.1 |
| Example 5 | Excellent and excellent properties | Level 2 | 1.5 |
| Example 6 | Excellent and excellent properties | Level 1 | 0.9 |
| Example 7 | Excellent and excellent properties | Level 2 | 0.8 |
| Example 8 | Excellent and excellent properties | Level 2 | 1.3 |
| Example 9 | Excellent and excellent properties | Level 1 | 0.9 |
| Example 10 | Excellent and excellent properties | Level 2 | 1.1 |
| Example 11 | Excellent and excellent properties | Level 1 | 0.9 |
| Example 12 | Excellent and excellent properties | Level 1 | 1.3 |
| Comparative example 1 | Difference of difference | Level 2 | 3.5 |
| Comparative example 2 | Good quality | 3 grade | 2.5 |
| Comparative example 3 | Good quality | Grade 4 | 2.6 |
| Comparative example 4 | Difference of difference | Grade 4 | 2.7 |
From the above test results, it is understood that the PC materials provided in the examples of the present invention have excellent high gloss, low warpage, and few appearance defects, wherein the PC materials provided in example 1 have the best overall properties. In the comparative example 1, the glass fiber is not uniformly shrunk in the transverse and longitudinal directions due to the orientation of the anisotropic glass fiber, the warping degree is large, the floating fiber of the glass fiber is serious, the gloss is poor and the glass fiber is nonuniform; the modified glass beads added in comparative example 2 are unsuitable and the floating fiber is improved, but the modified glass beads can lead to PC degradation and generate material flower defects; in comparative example 3, although modified glass beads were added, the pH was 5.5, resulting in PC degradation to produce the green bloom defect; the addition of unmodified glass beads to comparative example 4 also resulted in PC degradation to produce green flower defects.
Those of ordinary skill in the art will recognize that the embodiments herein are intended to assist the reader in understanding the principles of the invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (10)
1. The PC material with low warpage and good appearance is characterized by comprising the following components in parts by weight:
100 parts of polycarbonate;
5-50 parts of glass fiber;
2-50 parts of modified glass beads;
the modified glass beads are obtained by modifying maleic anhydride grafted acrylic acid polymer, the pH value of the modified glass beads is 6-8,
the gloss of the polycarbonate is more than or equal to 80 percent according to a 60-degree method,
the diameter of the glass fiber is 8-14 μm or 3 μm.
2. The low warp good appearance PC material of claim 1, comprising the following components in parts by weight:
100 parts of polycarbonate;
6-40 parts of glass fiber;
5-40 parts of modified glass beads.
3. The low warp good appearance PC material of claim 1, wherein the pH of the modified glass microspheres is 6.5 to 7.5.
4. The low warpage good-appearance PC material according to claim 1, wherein the grafting ratio of maleic anhydride in the maleic anhydride grafted acrylic polymer is 0.8 to 1.2%.
5. The low warp good appearance PC material of claim 1, wherein the modified glass microspheres are prepared by: mixing glass beads and maleic anhydride grafted acrylic polymer, obtaining the product.
6. The low warpage good-appearance PC material according to claim 1, wherein the polycarbonate is a double a-type polycarbonate, and has a weight average molecular weight of 18000 to 40000.
7. The low warp good appearance PC material of claim 1, wherein the glass fiber is made of alkali free aluminoborosilicate glass having a diameter of 8-14 μm.
8. The low warp good appearance PC material of claim 1, further comprising one or more of an antioxidant, a flame retardant, an anti-drip agent, a lubricant, a mold release agent, a plasticizer, a filler, an antistatic agent, an antibacterial agent, or a colorant.
9. The method for preparing the PC material with low warpage and good appearance according to any one of claims 1 to 8, which is characterized by comprising the following steps: and mixing the polycarbonate, the glass fiber and the modified glass beads, carrying out melt extrusion, and granulating to obtain the PC material with low warpage and good appearance.
10. The method for preparing the PC material with low warpage and good appearance according to any one of claims 1-8, which is applied to the preparation of large-size thin-wall products and high-size precision products.
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| CN101619161B (en) * | 2009-07-29 | 2012-05-02 | 深圳市华力兴工程塑料有限公司 | Padding strengthening flame-retardant polycarbonate and preparation method thereof |
| CN101787183B (en) * | 2009-10-15 | 2012-11-07 | 上海锦湖日丽塑料有限公司 | Low warping high surface gloss glass fiber reinforced polyester composite material and preparation method thereof |
| CN106433075B (en) * | 2016-11-02 | 2018-12-07 | 深圳市盈实科技有限公司 | A kind of low warpage polycarbonate of high glaze enhances fire proofing |
| CN107400342A (en) * | 2017-09-07 | 2017-11-28 | 滁州优胜高分子材料有限公司 | A kind of preparation method of anti-warp glass fiber enhancing flame-retardant PBT particle |
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