CN112226060A - Polycarbonate alloy composition and preparation method and application thereof - Google Patents

Abstract

The invention discloses a polycarbonate alloy composition and a preparation method and application thereof, wherein the polycarbonate alloy composition comprises the following components: 20-40 parts of polycarbonate; 5-30 parts of unsaturated cycloalkane; 1-5 parts of high surface energy auxiliary agent. The invention is unexpectedly found by research that the dielectric loss of the polycarbonate alloy composition can be obviously reduced by controlling the epoxy equivalent in the polycarbonate alloy composition within the range of 50-700g/eq, and the application of the polycarbonate alloy product is further widened.

Description

Polycarbonate alloy composition and preparation method and application thereof

Technical Field

The invention relates to the technical field of engineering plastics, in particular to a polycarbonate alloy composition and a preparation method and application thereof.

Background

Polycarbonate (PC) has good comprehensive performance, high mechanical strength, good impact toughness, stable size, good heat resistance and good electrical insulation, and can be widely applied to the fields of household appliances, digital products, IT products and the like. Because 5G communication adopts millimeter wave band, the shorter the wavelength of electromagnetic wave, the poorer the diffraction ability, and the greater the attenuation of electromagnetic wave in the transmission process, which means that the electromagnetic wave covering ability and transmission signal intensity of 5G communication are greatly reduced relative to the 4G communication era, the material also needs to regulate and control dielectric properties to reduce negative effects, and the dielectric constant and dielectric loss of the material are required to be small. Therefore, the modified plastics with low dielectric loss are in the future, and the research, design and preparation of the low dielectric loss modified plastics suitable for various industries is urgent.

Currently, there are many ways to reduce the dielectric loss of materials, the most common being for example:

1. selecting a substrate with low dielectric loss, for example, selecting materials with low dielectric loss such as PPO, PS, POK and the like as the substrate or alloy components; selecting low dielectric loss fibers;

2. selecting an auxiliary agent with low dielectric loss, wherein POE, SEBS and the like are adopted as far as possible as a toughening agent, and PE wax, PTFE wax powder and the like are adopted as far as possible as a lubricating agent;

3. introducing low dielectric loss fillers such as silica, mica powder, kaolin, and the like;

4. changing the micro topological structure and the shape of the material by adding special components or a production process;

5. the introduction of nano or micron order micropores in the system lowers the dielectric constant of the material.

Disclosure of Invention

It is a primary object of the present invention to provide a polycarbonate alloy composition having significantly reduced dielectric losses.

It is still another object of the present invention to provide a method for preparing the above polycarbonate alloy composition.

The invention is realized by the following technical scheme:

a polycarbonate alloy composition comprises the following components in parts by weight:

20-40 parts of polycarbonate;

5-30 parts of unsaturated cycloalkane;

1-5 parts of high surface energy auxiliary agent.

According to the invention, researches show that the dielectric loss of the polycarbonate alloy composition can be obviously reduced by controlling the epoxy equivalent in the polycarbonate alloy composition within the range of 50-700 g/eq. If the epoxy equivalent in the polycarbonate alloy composition is low, the effect of reducing the dielectric loss of the polycarbonate alloy composition cannot be achieved, if the epoxy equivalent in the polycarbonate alloy composition is high, the heat resistance is reduced due to crosslinking, and in addition, the dielectric loss is improved due to the increase of polarity, therefore, preferably, the epoxy equivalent in the polycarbonate alloy composition is preferably 400 g/eq in accordance with GB/T4612-2008 standard test. The epoxy equivalent means the mass of an epoxy resin containing 1mol of epoxy groups.

Preferably, the high surface energy auxiliary agent is one or a mixture of more of a surfactant containing an epoxy group, an antistatic agent or a compatilizer, and is specifically selected from one or a mixture of more of a propylene oxide copolymer, polyethylene oxide, a GMA graft polymer and a polyethylene oxide-propylene oxide copolymer.

The polycarbonate is selected from one or a mixture of more of aromatic polycarbonate, aliphatic polycarbonate, aromatic-aliphatic polycarbonate, branched polycarbonate and siloxane copolycarbonate.

The polycarbonate can be prepared by a phosgene method or an ester exchange method, and can also be obtained in a commercially available mode.

The unsaturated cycloalkane is selected from polystyrene, styrene-containing copolymer, graft polymer, block copolymer, etc.

According to actual performance requirements, the polycarbonate alloy composition also comprises 0-30 parts by weight of reinforcing filler and 0-20 parts by weight of other auxiliary agents.

The reinforcing filler is selected from one or more of glass fiber, talcum powder, wollastonite, kaolin and silicon powder.

The other auxiliary agents are selected from one or more of stabilizing agents, flame retardants, anti-dripping agents, lubricating agents, mold release agents, plasticizers, fillers and coloring agents.

Suitable stabilizers include one or more combinations of organophosphites such as triphenyl phosphite, tris- (2, 6-dimethylphenyl) phosphite, tris-nonylphenyl phosphite, dimethylbenzene phosphonate, trimethyl phosphate and the like, pentaerythritol bisphosphates (such as bis (2, 6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate), organophosphites, alkylated monophenols or polyphenols, alkylation reaction products of polyphenols and dienes, butylated reaction products of p-cresol or dicyclopentadiene, alkylated hydroquinones, hydroxylated thiodiphenyl ethers, alkylene-bisphenols, benzyl compounds, polyol esters, benzotriazoles, benzophenones.

Suitable flame retardants are selected from halogen based flame retardants or halogen free flame retardants; the halogen flame retardant is selected from one or more of brominated polystyrene, brominated polyphenylene oxide, brominated bisphenol A epoxy resin, brominated styrene-maleic anhydride copolymer, brominated epoxy resin, brominated phenoxy resin, decabromodiphenyl ether, decabromobiphenyl, brominated polycarbonate, perbromo tricyclopentadecane or brominated aromatic cross-linked polymer, and is preferably brominated polystyrene; the halogen-free flame retardant is selected from one or more of nitrogen-containing flame retardant, phosphorus-containing flame retardant or nitrogen and phosphorus-containing flame retardant.

Suitable anti-dripping agents are preferably fluorinated unsaturated cycloalkanes, such as polytetrafluoroethylene.

Suitable plasticizers are phthalates.

The lubricant is one or a mixture of two or more of ethylene bis stearamide EBS, erucamide, zinc stearate, silicone oil and PETS.

Suitable mold release agents include metal stearates, alkyl stearates, pentaerythritol stearates, paraffin wax, montan wax, and the like.

Suitable colorants include various pigments, dyes, such as carbon black, and the like.

The invention also provides a preparation method of the polycarbonate alloy composition, which comprises the following steps:

the components are uniformly mixed in a high-speed mixer according to the proportion, the rotating speed of the high-speed mixer is 450-500 rpm, the mixture is added into a double-screw extruder, the mixture is melted and mixed at the temperature of 240-260 ℃, and then the polycarbonate alloy composition is obtained through granulation, cooling and drying.

The invention also provides application of the polycarbonate alloy composition in mobile phones or televisions.

Compared with the prior art, the invention has the following beneficial effects:

the invention is discovered by the research of surprise that the epoxy equivalent in the polycarbonate alloy composition is controlled within the range of 50-700g/eq, so that the dielectric loss of the polycarbonate alloy composition can be obviously reduced, the loss of electric signals is reduced, the heat generation of a workpiece is reduced, the application of the polycarbonate alloy product is further widened, and the polycarbonate alloy composition is particularly suitable for mobile phone and television materials.

Detailed Description

The present invention is further illustrated by the following specific examples, which are, however, not intended to limit the scope of the invention.

Polycarbonate PC: aromatic polycarbonate, PC 130010 NP, LG chemistry;

unsaturated cycloalkane: polystyrene PS; purchasing in market;

glass fiber: glass fibers of PPG;

high surface energy assistant 1: SAG-002, L of Nantong Ri, GMA graft polymer;

high surface energy aid 2: KBM-3103, Shin-Etsu Chemical, Japan, propylene oxide copolymer;

lubricant: ethylene bis stearamide, EBS, is commercially available.

Test criteria or methods for each property:

method for measuring epoxy equivalent: GB/T4612-2008 standard;

dielectric loss: GB/T12636-.

Examples 1 to 11 and comparative examples 1 to 2: preparation of polycarbonate alloy composition

Uniformly mixing the components in a high-speed mixer according to the formula shown in the table 1, wherein the rotating speed of the high-speed mixer is 450-500 rpm, adding the mixture into a double-screw extruder, carrying out melt mixing at the temperature of 240-260 ℃, and then granulating, cooling and drying to obtain a polycarbonate alloy composition; the polycarbonate alloy compositions were tested and the data are shown in table 1.

TABLE 1 concrete compounding ratios (parts by weight) of examples 1 to 11 and comparative examples 1 to 2 and test performance results thereof

Continuing with Table 1:

from a comparison of the examples and comparative examples of table 1, it can be seen that: the dielectric loss of the polycarbonate alloy composition can be obviously reduced by controlling the epoxy equivalent in the polycarbonate alloy composition within the range of 50-700 g/eq. In comparative example 1, when the epoxy equivalent in the polycarbonate alloy composition is 0, the dielectric loss of the polycarbonate alloy composition is high. In comparative example 2, when the epoxy equivalent in the polycarbonate alloy composition is excessive, dielectric loss increases due to polar ionization and crosslinking.

Claims (10)

1. The polycarbonate alloy composition is characterized by comprising the following components in parts by weight:

20-40 parts of polycarbonate;

5-30 parts of unsaturated cycloalkane;

1-5 parts of high surface energy auxiliary agent.

2. The polycarbonate alloy composition of claim 1, wherein the polycarbonate alloy composition has an epoxy equivalent weight of 50-700g/eq, preferably 100-400 g/eq, as measured according to GB/T4612-2008 standard.

3. The polycarbonate alloy composition of claim 1, wherein the high surface energy additive is one or a mixture of surfactants, antistatic agents, or compatibilizers containing epoxy groups.

4. The polycarbonate alloy composition of claim 3, wherein the high surface energy additive is selected from one or more of propylene oxide copolymer, polyethylene oxide, GMA graft polymer, and polyethylene oxide-propylene oxide copolymer.

5. The polycarbonate alloy composition of claim 1, wherein the unsaturated cycloalkane is selected from one or more of polystyrene, styrene-containing copolymer, polyphenylene oxide, graft polymer, and block copolymer.

6. The polycarbonate alloy composition of claim 1, wherein the polycarbonate is selected from one or a mixture of aromatic polycarbonate, aliphatic polycarbonate, aromatic-aliphatic polycarbonate, branched polycarbonate, and siloxane copolycarbonate.

7. The polycarbonate alloy composition of any of claims 1-6, further comprising 0-30 parts by weight of a reinforcing filler, and 0-20 parts by weight of other additives.

8. The polycarbonate alloy composition of claim 7, wherein the reinforcing filler is selected from one or more of glass fiber, talc, wollastonite, kaolin, and silica powder; the other auxiliary agents are selected from one or more of stabilizing agents, flame retardants, anti-dripping agents, lubricating agents, mold release agents, plasticizers, fillers and coloring agents.

9. The method of making a polycarbonate alloy composition of any of claims 1-8, comprising the steps of:

the components are uniformly mixed in a high-speed mixer according to the proportion, the rotating speed of the high-speed mixer is 450-500 rpm, the mixture is added into a double-screw extruder, the mixture is melted and mixed at the temperature of 240-260 ℃, and then the polycarbonate alloy composition is obtained through granulation, cooling and drying.

10. Use of the polycarbonate alloy composition of any of claims 1-9 in a cell phone or television.