CN103694662B - 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, particularly relate 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 is with universal, concentrate many drawbacks of initiation for improving this type of light source luminescent point, and people meet to the requirement in the appearance design of lamp decoration material, develop the PC with light diffusion effect, the materials such as PMMA simultaneously.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 comparatively large (as 2cm) field its light transmission when the having good light diffusion effect penetrance that is poor, light of thickness; Having, good light transmissibility 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 to have the requirement of CTI usually 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 the fire-retardant smooth diffusion tree oil/fat composition that exploitation has high CTI has the wide market space.

In existing invention, more pay close attention to flame retardant properties and light diffusing energy, the CTI value of material is not explicitly pointed out, take PC as the fire-retardant smooth diffusion group compound of matrix as patent US20090258170A1 discloses a kind of, add organic light diffusing agent and organic silicon fibre retardant, reach light diffusing and flame retardant resistance, reach V1 level; Patent CN101906244A discloses the fire-retardant light diffusion PC composition that a kind of PC is matrix, add light inlet diffusion master batch, with sulfonate and organic silicon compound fire-retardant, reach (1.6mm) V0 flame retardant grade, but above-mentioned two sections of patents do not illustrate the CTI value of the material invented, and can not meet the demand of specific occasion.Improve the method for CTI at present mainly by adding flaky inorganic filler or selecting different fire retardants to carry out composite realization simultaneously, 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 to create screening effect to light source, can not realize the light diffusion of material.

Summary of the invention

The object of the invention is to the defect overcoming the existence of above-mentioned prior art, 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, is applicable to the field such as household electrical appliances, switch indication light.

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, 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, can select the FR2025 that 3M company produces.

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

Second aspect, the invention still further relates to the preparation method of aforesaid high CTI halogen-free flameproof light diffusional modification polycarbonate, 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, and temperature is 240-260 DEG C.

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 the requirement of IEC tissue proposition for unserviced electron device requirement CTI >=300V.The present invention makes simply, is applicable to the fields such as household electrical appliances, electronic apparatus, switch indication light.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.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 salt flame, the FR2025 for Minnesota Mining and Manufacturing Company's production selected;

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

Described oxidation inhibitor is that phosphorous acid esters and Hinered phenols are composite, preferably 168 (three [2.4-di-tert-butyl-phenyl] phosphorous acid esters), 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

Raw material is taken by following weight percent content:

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 together, discharging; Again this compound is put into twin screw extruder extruding pelletization, obtained light diffusional modification PC composition.Wherein, technological temperature is at 240 DEG C, and screw speed is at 200 revs/min.

embodiment 2

Raw material is taken by following weight percent content:

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 together, discharging; Again this compound is put into twin screw extruder extruding pelletization, obtained light diffusional modification PC composition.Wherein, technological temperature is at 260 DEG C, and screw speed is at 400 revs/min.

embodiment 3

Raw material is taken by following weight percent content:

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 together, discharging; Again this compound is put into twin screw extruder extruding pelletization, obtained light diffusional modification PC composition.Wherein, technological temperature is at 250 DEG C, and screw speed is at 300 revs/min.

embodiment 4

Raw material is taken by following weight percent content:

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 together, discharging; Again this compound is put into twin screw extruder extruding pelletization, obtained light diffusional modification PC composition.Wherein, technological temperature is at 260 DEG C, and screw speed is at 300 revs/min.

embodiment 5

Raw material is taken by following weight percent content:

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 together, discharging; Again this compound is put into twin screw extruder extruding pelletization, obtained light diffusional modification PC composition.Wherein, technological temperature is at 260 DEG C, and screw speed is at 400 revs/min.

comparative example 1

Raw material is taken by following weight percent content:

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 together, discharging; Again this compound is put into twin screw extruder extruding pelletization, obtained light diffusional modification PC composition.Wherein, technological temperature is at 260 DEG C, and screw speed is at 400 revs/min.

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

table 1

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

table 2

Compared with common halogen-free flameproof light diffusing polycarbonate (comparative example 1), 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 preparation of the present invention simultaneously, have excellent transmittance and flame retardant resistance, and the present invention makes simply, is applicable to the field such as household electrical appliance, electronic apparatus.

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

Claims (8)

1. a high CTI halogen-free flameproof light diffusional modification PC composition, it 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%;

Described polyolefine is polyisobutene, molecular weight 400-2400.

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

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

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

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

8., according to the preparation method of the arbitrary described fire-retardant smooth diffusional modification polycarbonate of high CTI of claim 1-7, 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, and temperature is 240-260 DEG C.