CN103694662A - High-CTI (comparative tracking index) halogen-free flame-retardant light diffusion modified PC (polycarbonate) and preparation method thereof - Google Patents

Abstract

The invention relates to a high-CTI (comparative tracking index) halogen-free flame-retardant light diffusion modified PC (polycarbonate) composition which comprises the following components in percentage by weight: 80-90 percent of PC, 0.5-10.0 percent of light diffusing agent, 1-10 percent of polyolefin, 0.1-0.5 percent of antioxidant, 0.1-0.4 percent of light stabilizer, 0.1-1.0 percent of dispersing agent and 0.1-2.0 percent of fire retardant. The invention further relates to a preparation method of the composition. The preparation method comprises the following steps of: weighing all components in percentage by weight, mixing in a high mixing machine, discharging, and then extruding and granulating by using a twin-screw extruder. Compared with the prior art, the composition provided by the invention has excellent light diffusion effect, semi-transparent effect, and better light transmittance. The composition is simple in preparation and can be suitable for the fields such as light diffusion PC household appliances with higher workpiece thickness.

Description

A kind of high CTI halogen-free flameproof light diffusional modification PC and preparation method thereof

Technical field

The present invention relates to a kind of polymeric material field, relate in particular to a kind of high CTI halogen-free flameproof light diffusional modification PC and preparation method thereof.

Background technology

Along with the technical development of the cold light sources such as LED and universal, for improving this type of light source luminescent point, concentrate the many drawbacks that cause simultaneously, and people for satisfied to the requirement in the appearance design of lamp decoration material, developed the PC with light diffusion effect, the materials such as PMMA.It is higher that transparent PC material has shock strength, and chemical stability is good, good stability of the dimension, and surface hardness is high, the feature that light transmission is good.But the PC of light diffusion is at present material modified poor in large (as 2cm) field its light transmission when the having good light diffusion effect penetrance poor, light of thickness; Having, good light penetration time diffusion effect is poor again, not good to the disguise of light source.

Along with the enhancing of people's safety and environmental protection consciousness, more and more higher to the requirement of material therefor, especially the requirement of the safety performance of material is progressively improved.As unserviced electronic devices and components have the requirement of CTI conventionally according to the difference of applied environment, IEC tissue proposes to require CTI >=300V for unserviced electron device, and the CTI of PC is generally 150～250V, so having the fire-retardant smooth diffusion tree oil/fat composition of high CTI, exploitation there is the wide market space.

In existing invention, more pay close attention to flame retardant properties and light diffusing energy, CTI value to material does not explicitly point out, as the patent US20090258170A1 fire-retardant smooth diffusion group compound that to have announced a kind of PC of take be matrix, add organic light diffusing agent and organic silicon fibre retardant, reach light diffusing and flame retardant resistance, reach V1 level; Patent CN101906244A has announced the fire-retardant light diffusion PC composition that a kind of PC is matrix, add light inlet diffusion master batch, fire-retardant with sulfonate and organic silicon compound, reach (1.6mm) V0 flame retardant grade, but above-mentioned two pieces of patents do not illustrate the CTI value of the material of not inventing, can not meet the demand of specific occasion.The method that simultaneously improves at present CTI is mainly by adding flaky inorganic filler or selecting different fire retardants to carry out composite realization, although these technical schemes can realize the raising of CTI value to a certain extent, simultaneously, the mechanical property of material declines, and for light diffusion PC, maximum defect is light source to produce screening effect, can not realize the light diffusion of material.

Summary of the invention

The object of the invention is to overcome the defect that above-mentioned prior art exists, a kind of high CTI halogen-free flameproof light diffusional modification PC composition and method of making the same is provided.PC material of the present invention has the fire-retardant and high CTI value of the light diffusion PC material that excellent light diffusion effect realizes simultaneously when product thickness is larger.The present invention makes simply, and cost spreads the materials such as PC, PMMA far below light, applicable to fields such as household electrical appliances, switch indication lights.

Object of the present invention can be achieved through the following technical solutions:

First aspect, the present invention relates to a kind of high CTI halogen-free flameproof light diffusional modification PC composition, and said composition is composed of the following components by weight percentage:

Polycarbonate 80-90%;

Light diffusing agent 0.5-10.0%;

Polyolefine 1-10.0%

Oxidation inhibitor 0.1-0.5%;

Photostabilizer 0.1-0.4%;

Dispersion agent 0.1-1.0%;

Fire retardant 0.1-2.0%.

Preferably, described polycarbonate is high transparency polycarbonate.

Preferably, described light diffusing agent is mineral-type light diffusing agent, can be calcium carbonate, glass microballon, barium sulfate.

Preferably, described polyolefine is polyisobutene, molecular weight 400-2400.

Preferably, described oxidation inhibitor is that phosphorous acid esters and phenols are composite.

Preferably, described photostabilizer is hindered amines.

Preferably, described fire retardant is organic sulfonate based flame retardant, the FR2025 that can select 3M company to produce.

Preferably, described dispersion agent can be PE wax, can be also ethylene bis stearamide for EBS.

Second aspect, the invention still further relates to the preparation method of aforesaid high CTI halogen-free flameproof light diffusional modification polycarbonate, and described method comprises the steps:

(1) content takes raw material by weight percentage;

By step (1) in mixed raw material put into twin screw machine extruding pelletization, the rotating speed of dual-screw-stem machine is 200-400 rev/min, temperature is 240-260 ℃.

Compared with prior art, the present invention has following beneficial effect: PC material of the present invention has the fire-retardant and high CTI value of the light diffusion PC material that excellent light diffusion effect realizes simultaneously when product thickness is larger, can meet IEC tissue and propose the requirement for unserviced electron device requirement CTI >=300V.The present invention makes simply, applicable to fields such as household electrical appliances, electronic apparatus, switch indication lights.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.

It should be noted that, in following examples:

Described polycarbonate is high transparency polycarbonate;

Described light diffusing agent is mineral-type light diffusing agent barium sulfate;

Described fire retardant is sulfonate fire retardant, the FR2025 for Minnesota Mining and Manufacturing Company's production selecting;

Described polyisobutene, molecular weight is 400-2400, and preferred molecular weight is 680, and (PB680 is the trade mark of Korea S great Lin company to the PB680 producing for Korea S great Lin company selecting, and Chinese is exactly polyisobutene );

Described oxidation inhibitor is that phosphorous acid esters and Hinered phenols are composite, preferred 168 (three [2.4-di-tert-butyl-phenyl] phosphorous acid esters), and 1010 (four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters) are composite;

Described photostabilizer is for containing triazine hindered amine polycondensate;

Described dispersion agent is PE wax.

embodiment 1

By following weight percent content, take raw material:

PC 85.7%

Light diffusing agent 10.0%

Polyisobutene 2.0%

Organic sulfonate 0.5%

Oxidation inhibitor 0.5%

Photostabilizer 0.3%

Dispersion agent 1.0%

Above-mentioned raw materials is put into high-speed mixer and mixing 5min, discharging together; Again this compound is put into twin screw extruder extruding pelletization, make light diffusional modification PC composition.Wherein, technological temperature is at 240 ℃, and screw speed is at 200 revs/min.

embodiment 2

By following weight percent content, take raw material:

PC 80.0%

Light diffusing agent 6.6%

Polyisobutene 10.0%

Organic sulfonate 2.0%

Oxidation inhibitor 0.3%

Photostabilizer 0.1%

Dispersion agent 1.0%

Above-mentioned raw materials is put into high-speed mixer and mixing 2min, discharging together; Again this compound is put into twin screw extruder extruding pelletization, make light diffusional modification PC composition.Wherein, technological temperature is at 260 ℃, and screw speed is at 400 revs/min.

embodiment 3

By following weight percent content, take raw material:

PC 90.0%

Light diffusing agent 0.5%

Polyisobutene 7.7%

Organic sulfonate 1.5%

Oxidation inhibitor 0.1%

Photostabilizer 0.1%

Dispersion agent 0.1%

Above-mentioned raw materials is put into high-speed mixer and mixing 3min, discharging together; Again this compound is put into twin screw extruder extruding pelletization, make light diffusional modification PC composition.Wherein, technological temperature is at 250 ℃, and screw speed is at 300 revs/min.

embodiment 4

By following weight percent content, take raw material:

PC 88.5%

Light diffusing agent 9.0%

Polyisobutene 1.0%

Organic sulfonate 0.1%

Oxidation inhibitor 0.5%

Photostabilizer 0.4%

Dispersion agent 0.5%

Above-mentioned raw materials is put into high-speed mixer and mixing 5min, discharging together; Again this compound is put into twin screw extruder extruding pelletization, make light diffusional modification PC composition.Wherein, technological temperature is at 260 ℃, and screw speed is at 300 revs/min.

embodiment 5

By following weight percent content, take raw material:

PC 87.4%

Light diffusing agent 5.0%

Polyisobutene 5.0%

Organic sulfonate 1.8%

Oxidation inhibitor 0.3%

Photostabilizer 0.2%

Dispersion agent 0.3%

Above-mentioned raw materials is put into high-speed mixer and mixing 3min, discharging together; Again this compound is put into twin screw extruder extruding pelletization, make light diffusional modification PC composition.Wherein, technological temperature is at 260 ℃, and screw speed is at 400 revs/min.

comparative example 1

By following weight percent content, take raw material:

PC 89.2%

Light diffusing agent 9.0%

Organic sulfonate 1.0%

Oxidation inhibitor 0.3%

Photostabilizer 0.1%

Dispersion agent 0.4%

Above-mentioned raw materials is put into high-speed mixer and mixing 3min, discharging together; Again this compound is put into twin screw extruder extruding pelletization, make light diffusional modification PC composition.Wherein, technological temperature is at 260 ℃, and screw speed is at 400 revs/min.

Table 1 has been listed the concrete component of embodiment 1-5 and comparative example 1, and table 2 is the test comparison results that make transmittance, mist degree, aging rear yellowness index variation, flame retardant properties and the CTI value of high CTI halogen-free flameproof light diffusion PC.Wherein, yellowness index variation Yi measures after 50-60 ℃ of irradiation of 340nm 168h; UL94 standard testing is pressed in flame retardant properties test, and batten thickness is 1.6mm; CTI value is pressed IEC60112 standard testing.

table 1

The performance of the testing of materials that the material of above-described embodiment 1～5 preparation and comparative example 1 make sees the following form 2.

table 2

Compare (comparative example 1) with common halogen-free flameproof light diffusing polycarbonate, prepared high CTI halogen-free flameproof light diffusing polycarbonate CTI value increases substantially, and meets the requirement of IEC tissue to unattended electronic apparatus goods CTI >=300; The high CTI halogen-free and flame-retardant polycarbonate material of simultaneously preparation of the present invention, has excellent transmittance and flame retardant resistance, and the present invention makes simply, applicable to fields such as household electrical appliance, electronic apparatuss.

Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (9)

1. a high CTI halogen-free flameproof light diffusional modification PC composition, is characterized in that, said composition is composed of the following components by weight percentage:

Polycarbonate 80-90%;

Light diffusing agent 0.5-10.0%;

Polyolefine 1-10.0%

Oxidation inhibitor 0.1-0.5%;

Photostabilizer 0.1-0.4%;

Dispersion agent 0.1-1.0%;

Fire retardant 0.1-2.0%.

2. PC composition according to claim 1, is characterized in that, described polycarbonate is high transparency polycarbonate.

3. PC composition according to claim 1, is characterized in that, described light diffusing agent is mineral-type light diffusing agent, can be calcium carbonate, glass microballon, barium sulfate.

4. PC composition according to claim 1, is characterized in that, described polyolefine is polyisobutene, molecular weight 400-2400.

5. PC composition according to claim 1, is characterized in that, described oxidation inhibitor is that phosphorous acid esters and phenols are composite.

6. PC composition according to claim 1, is characterized in that, described photostabilizer is hindered amines.

7. PC composition according to claim 1, is characterized in that, described fire retardant is organic sulfonate based flame retardant.

8. PC composition according to claim 1, is characterized in that, described dispersion agent is selected from PE wax or ethylene bis stearamide.

9. according to the preparation method of the arbitrary described fire-retardant smooth diffusional modification polycarbonate of high CTI of claim 1-8, it is characterized in that, described preparation method comprises the following steps:

(1) content takes raw material by weight percentage;

By step (1) in mixed raw material put into twin screw machine extruding pelletization, the rotating speed of dual-screw-stem machine is 200-400 rev/min, temperature is 240-260 ℃.