TWI757885B - A high performance halogen-free flame retardant pc/cf composite and products thereof - Google Patents

Abstract

The instant disclosure provides a high-performance halogen-free flame retardant PC/CF composite and products thereof, which comprises the following components by weight: 60-75 parts of PC, 10-30 parts of carbon fiber, and 4.5-10 parts of flame retardant. The flame retardant is composed of phosphazene flame retardant and organosilicon flame retardant. The beneficial effect of the instant disclosure is that compared with adding more flame retardants in the prior art, the high-performance halogen-free flame retardant PC/CF composite can not only reduce the amount of flame retardant, but also keep the flame retardant grade of 0.8 mm V-0 by adding flame retardant composed of phosphazene flame retardant and organosilicon flame retardant into the PC/CF composite. At the same time, the heat deflection temperature was improved.

Description

A high-performance halogen-free flame retardant PC/CF composite material and its products

The invention relates to the technical field of composite materials, in particular to a high-performance halogen-free flame-retardant PC/CF composite material and its products.

In the fields of electronic appliances, automobiles, etc., the lightweight of products has gradually become the trend of modern products. The composite materials of polycarbonate (PC) and carbon fiber (CF) have high strength and are compatible with other reinforcing materials. It is more and more popular because of its small specific gravity.

In electronic and electrical products, PC/CF composites have higher requirements for flame retardancy, so more flame retardants are added to the composite materials. However, when the diameter of carbon fibers is in the micron level, there is a serious "wick" when burning. Excessive flame retardant not only reduces the physical properties, but also reduces the Heat Deflection Temperature (HDT) of the material to below 90°C.

Therefore, it is necessary to improve the existing technology.

The technical problem to be solved by the present invention is: in order to solve the problem of reducing the HDT of the material due to the addition of more flame retardants in the PC/CF composite material in the prior art question. The present invention provides a high-performance halogen-free flame-retardant PC/CF composite material and its products to solve the above problems.

The solution of the present invention to solve the technical problem is: a high-performance halogen-free flame retardant PC/CF composite material, comprising the following components in parts by weight: PC, 60-75 parts; carbon fiber, 10-30 parts; and a flame retardant, 4.5~10 parts; the flame retardant is compounded by phosphazene flame retardant and organosilicon flame retardant.

Preferably, PC is bisphenol A polycarbonate, polyester polycarbonate, silicone-polycarbonate (copolymerization), cyclohexane bisphenol A polycarbonate, and bisphenol TMC (1,1 -One or more compounds of high temperature resistant polycarbonate synthesized by Bis(4-hydroyphenyl)-3,3,5-trimethyl-cyclohexane).

Preferably, the weight average molecular weight of PC is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.5.

Preferably, when the temperature is 300° C. and the load weight is 1.2 kg, the melt mass flow rate of the PC is (3~70) g/10min.

Preferably, the phosphazene flame retardant is phenoxy cyclophosphazene, and the phosphorus content of phenoxy cyclophosphazene is greater than 13%, the nitrogen content is greater than 5.8%, the concentration of hetero ions is less than 0.01%, and the weight is less than 0.01%. The average molecular weight is 693 and the purity is greater than 98.5%.

Preferably, the silicone flame retardant is vinyl-phenylsilane, the silicon content of vinyl-phenylsilane is 50%-70%, and the weight average molecular weight of the silane is between 2000-4000.

Preferably, the number of filaments of the carbon fiber is between 40K and 60K, the diameter of the single filament is between 5 and 15 μm and the chopped length is between 1 and 15 mm.

Preferably, the surface treatment agent of carbon fiber is carbamate, carbamate The molecular weight is between 200 and 500.

Preferably, 0.1-1 part of a plastic anti-drip agent is also included.

The present invention also provides a product, which is prepared by using the above-mentioned high-performance halogen-free flame-retardant PC/CF composite material.

The beneficial effect of the present invention is that, compared with the prior art that adds more flame retardants to the PC/CF composite material, the high performance halogen-free flame retardant PC/CF composite material can be obtained by adding more flame retardants to the PC/CF composite material. The flame retardant compounded by phosphazene flame retardant and silicone flame retardant not only reduces the amount of flame retardant, but also enables PC/CF composite materials to maintain the flame retardant grade of 0.8mmV-0, Raise its HDT.

The invention provides a high-performance halogen-free flame-retardant PC/CF composite material, comprising the following components in parts by weight: PC, 60-75 parts; carbon fiber, 10-30 parts; and flame retardant, 4.5-10 parts, wherein The flame retardant is compounded by phosphazene flame retardant and organosilicon flame retardant, and the phosphazene flame retardant is 4~8 parts, and the organosilicon flame retardant is 0.5~2 parts.

Specifically, in the high-performance halogen-free flame retardant PC/CF composite material, PC is bisphenol A polycarbonate, polyester polycarbonate, organosilicon-polycarbonate (copolymerization), cyclohexane bisphenol A One or more compounds of high temperature resistant polycarbonate synthesized from bisphenol TMC and bisphenol TMC. The weight average molecular weight of PC is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.5. Under the temperature of 300℃ and the load weight of 1.2kg, the melt mass flow rate of PC is (3~70)g/10min.

In the high performance halogen-free flame retardant PC/CF composite material, the phosphazene flame retardant is phenoxy cyclophosphazene, and the phosphorus content of phenoxy cyclophosphazene is greater than 13%, the nitrogen content is greater than 5.8%, and the concentration of hetero ions Less than 0.01%, weight average molecular weight 693 and purity greater than 98.5%.

In this high-performance halogen-free flame retardant PC/CF composite material, the silicone flame retardant is vinyl-phenylsilane, the silicon content of vinyl-phenylsilane is 50%~70%, and the silane weight average molecular weight is 2000~ between 4000.

In the high-performance halogen-free flame-retardant PC/CF composite material, the number of carbon fibers is between 40K and 60K, the diameter of the single fiber is 5-15μm and the chopped length is 1-15mm. The surface treatment agent of carbon fiber is carbamate, and the molecular weight of carbamate is between 200 and 500.

The high-performance halogen-free flame-retardant PC/CF composite material also includes 0.1 to 1 part of a plastic anti-drip agent. The plastic anti-drip agent makes the PC material fibrillated in the plastic processing, has the characteristics of thermal shrinkage, and achieves the effect of flame retardant and anti-drip.

The technical solutions of the present invention are further described below by means of specific embodiments.

Example 1

A high-performance halogen-free flame retardant PC/CF composite material comprises the following components in parts by weight: 72.7 parts of PC, 20 parts of carbon fiber, 7 parts of flame retardant and 0.3 part of plastic anti-drip agent.

Specifically, PC is bisphenol A polycarbonate. At a temperature of 300°C and a load weight of 1.2kg, the melt mass flow rate of PC was 40g/10min.

The number of filaments of carbon fiber is between 40K~60K, the diameter of the single filament is 5~15μm and the chopped length is 1~15mm. The surface treatment agent of carbon fiber is carbamate, and the molecular weight of carbamate is between 200 and 500.

The flame retardant is a compound of 6 parts of phenoxycyclophosphazene and 1 part of vinyl-phenylsilane. The phosphorus content of phenoxycyclophosphazene is more than 13%, the nitrogen content is more than 5.8%, the concentration of hetero ions is less than 0.01%, the weight average molecular weight is 693, and the purity is more than 98.5%. The silicon content of vinyl-phenylsilane is 50%~70%, and the silane weight average molecular weight is between 2000~4000.

The plastic anti-drip agent is polytetrafluoroethylene.

When preparing the high-performance halogen-free flame-retardant PC/CF composite material, the components in the corresponding parts by weight are weighed according to the above ratio, and the components are uniformly mixed and then melted, extruded and pelletized.

Comparative Example 1

A PC/CF composite material comprises the following components in parts by weight: 66.7 parts of PC, 20 parts of carbon fiber, 13 parts of flame retardant and 0.3 part of plastic anti-drip agent.

Specifically, the PC is bisphenol A polycarbonate, the flame retardant is a phosphate ester flame retardant (Bisphenol-A Bis (Diphenyl Phosphate), BDP), and the plastic anti-drip agent is polytetrafluoroethylene.

The preparation method of the composite material is the same as that of Example 1.

Example 2

A high-performance halogen-free flame-retardant PC/CF composite material comprises the following components in parts by weight: 65.7 parts of PC, 25 parts of carbon fiber, 9 parts of flame retardant and 0.3 part of plastic anti-drip agent.

Specifically, PC is bisphenol A polycarbonate. At a temperature of 300°C and a load weight of 1.2kg, the melt mass flow rate of PC was 40g/10min.

The number of filaments of carbon fiber is between 40K~60K, the diameter of the single filament is 5~15μm and the chopped length is 1~15mm. The surface treatment agent of carbon fiber is urethane, urethane The molecular weight of the ester is between 200 and 500.

The flame retardant is compounded by 8 parts of phenoxy cyclophosphazene and 1 part of vinyl-phenyl silane. The phosphorus content of phenoxycyclophosphazene is more than 13%, the nitrogen content is more than 5.8%, the concentration of hetero ions is less than 0.01%, the weight average molecular weight is 693, and the purity is more than 98.5%. The silicon content of vinyl-phenylsilane is 50%~70%, and the weight average molecular weight of the silane is between 2000~4000.

The plastic anti-drip agent is polytetrafluoroethylene.

When preparing the high-performance halogen-free flame-retardant PC/CF composite material, the components in the corresponding parts by weight are weighed according to the above ratio, and the components are uniformly mixed and then melted, extruded and pelletized.

Comparative Example 2

A PC/CF composite material comprises the following components in parts by weight: 60.7 parts of PC, 25 parts of carbon fiber, 14 parts of flame retardant and 0.3 part of plastic anti-drip agent.

Specifically, the PC is bisphenol A polycarbonate, the flame retardant is a phosphate ester flame retardant (BDP), and the plastic anti-drip agent is polytetrafluoroethylene.

The preparation method of the composite material is the same as that of Example 2.

After the above Example 1, Comparative Example 1, Example 2 and Comparative Example 2 were melt-extruded and pelletized, the particles in each example were then injection-molded into standard test specimens on an injection molding machine, and the mechanical properties of the obtained materials were tested according to the standard , the test results are shown in Table 1:

From the test results of Example 1, Comparative Example 1, Example 2 and Comparative Example 2, it can be known that: compared with the prior art that adds more flame retardants to the PC/CF composite material, the present invention is The addition of a flame retardant compounded by phosphazene flame retardant and organosilicon flame retardant to the composite material not only reduces the amount of flame retardant, but also enables the PC/CF composite material to maintain a flame retardant of 0.8mm V-0. While leveling, increase its HDT.

The present invention also provides a product, which is made of the above-mentioned high-performance halogen-free flame-retardant PC/CF composite material, has high flame retardancy and high HDT, and can be widely used in electronic and electrical products that require high flame retardant grades middle.

It should be pointed out that the present invention is not limited to the above-mentioned embodiments, and any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments by any person skilled in the art based on the technical solutions of the present invention all fall within the protection scope of the present invention.

Claims (7)

A high-performance halogen-free flame retardant PC/CF composite material, comprising the following components in parts by weight: PC, 60-75 parts; carbon fiber, 10-30 parts; and a flame retardant, 4.5-10 parts; The flame retardant is compounded by a phosphazene flame retardant and an organosilicon flame retardant, the phosphazene flame retardant is a phenoxy cyclophosphazene, and the phosphorus of the phenoxy cyclophosphazene is The content is greater than 13%, the nitrogen content is greater than 5.8%, the concentration of impurity ions is less than 0.01%, the weight average molecular weight is 693, and the purity is greater than 98.5%; the silicone flame retardant is vinyl-phenylsilane, and the vinyl-phenylsilane The content of silicon is 50%~70%, and the weight average molecular weight of silane is between 2000~4000; among them, the PC is bisphenol A type polycarbonate, polyester type polycarbonate, organosilicon-polycarbonate (copolymer) , cyclohexane bisphenol A polycarbonate, and one or more compounds of high temperature polycarbonate synthesized from bisphenol TMC (1,1-Bis(4-hydroyphenyl)-3,3,5-trimethyl-cyclohexane) match. The high-performance halogen-free flame-retardant PC/CF composite material according to claim 1, wherein the weight-average molecular weight of the PC is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.5. The high-performance halogen-free flame-retardant PC/CF composite material according to claim 2, wherein at a temperature of 300° C. and a load weight of 1.2 kg, the melt mass flow rate of the PC is (3~70) g/10min . The high-performance halogen-free flame-retardant PC/CF composite material according to claim 1, wherein the number of filaments of the carbon fiber is between 40K and 60K, the diameter of the single filament is 5-15 μm and the chopped length is 1-15 mm. The high-performance halogen-free flame retardant PC/CF composite material according to claim 4, wherein a surface treatment agent of the carbon fiber is urethane, and the molecular weight of the urethane is between 200 and 500. The high-performance halogen-free flame-retardant PC/CF composite material according to claim 1 further includes 0.1-1 part of a plastic anti-drip agent. A product, comprising: using the high-performance halogen-free flame-retardant PC/CF composite material according to any one of claims 1 to 6.