CN105542426A - Low-expansion, flame-retardant and photodiffusion PC (polycarbonate) composite material for LED lamp tube and preparation method of PC composite material - Google Patents
Low-expansion, flame-retardant and photodiffusion PC (polycarbonate) composite material for LED lamp tube and preparation method of PC composite material Download PDFInfo
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Abstract
The invention relates to the technical field of modified plastics, in particular to a low-expansion, flame-retardant and photodiffusion PC (polycarbonate) composite material for an LED lamp tube and a preparation method of the PC composite material. The PC composite material comprises raw materials in parts by weight as follows: 80-100 parts of PC, 4-25 parts of an enhancing additive, 0.3-3 parts of a flame retardant, 0.2-1.5 parts of a photodiffusion agent and 0.2-1 part of an antioxidant, wherein the enhancing additive is one or a mixture of flat glass fibers, glass powder, wollastonite, white carbon black, BDP and RDP; the flame retardant is a mixture of phenyl silicone resin crystals and PC carrier PTFE (polytetrafluoroethylene) which are mixed in any mixing ratio. The process is simple, the prepared material has low expansion and flame retardant characteristics through PC enhancement and flame retardant modification, and meanwhile, the material has good light transmittance, haze and mechanical property and can be applied to the field of ultrathin lamp tubes with large sizes.
Description
Technical field
The present invention relates to modified plastics technical field, be specifically related to a kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material and preparation method thereof.
Background technology
LED, owing to having unique advantage, since birth, has been developed rapidly.Because LED lighting, it utilizes solid semiconductor chip as luminescent material, release superfluous energy by current carrier generation compound in the semiconductors and cause photo emissions, directly send red, yellow, blue, green light, on this basis, the light that fluorescent material can send random color is added.But these scattering of light degree are not enough, and light intensity is higher, can not directly use, and uses after generally realizing scattering by additional diffusion shell.Generally the materials such as PC, PMMA, PS, PCTG, PET can be had as the material of diffusion shell, in these materials, PC is the amorphous polymer of almost colourless vitreous state, have heigh clarity and the advantage such as free dyeability, high tenacity, preferably electrical insulating property, current usage quantity is at most the widest.But along with market demands are more and more higher, the intensity, linear expansivity etc. of PC more and more can not meet requirement, particularly for length, thin fluorescent tube, general PC all cannot meet the demands, it is flexible and shrink or expand excessive, and therefore, urgent need upgrading products of will being correlated with meet the demands.
Publication number is that the patent of invention of CN104725816A discloses the common fiberglass reinforced modification PC of use, but because common glass belongs to cylindrical, reinforced effects is more limited, cause effect is improved not obviously for sinuousness, expansion etc., in addition, the specific refractory power of material is about 1.45, and transmittance significantly declines, lighting effect is poorer than ordinary light diffusion PC, and the homogeneity of light is poor; Therefore, single use glass, addition is large, and reinforced effects is not obvious, apparent weak effect.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material is provided, there is low bulk and flame-retarding characteristic, have the features such as good transmittance, mist degree, mechanical property simultaneously concurrently, meet and use in large size, ultra-thin fluorescent tube field.
Another object of the present invention is to for the deficiencies in the prior art, a kind of LED lamp tube low bulk fire-retardant light diffusion PC preparation method of matrix material is provided, technique is simple, by to PC strengthen, flame-retardant modified, obtained material has low bulk and flame-retarding characteristic, has good transmittance, mist degree, mechanical property concurrently simultaneously.
The present invention is achieved through the following technical solutions.
A kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises the raw material of following weight part:
Polycarbonate 80-100 part
Reinforcing aids 4-25 part
Fire retardant 0.3-3 part
Light diffusing agent 0.2-1.5 part
Oxidation inhibitor 0.2-1 part.
Wherein, described reinforcing aids is one or more the mixture in flat glass fiber, glass powder, wollastonite, white carbon black, BDP, RDP;
Wherein, described fire retardant be phenyl polysiloxane crystal, the mixture that mixes with arbitrary proportion of PC carrier polytetrafluoroethylene (PTFE).
Particularly, the particle diameter of described glass powder is 5000 orders, the particle diameter of wollastonite is 5000 orders, and it is 2.6 microns that particle diameter 5000 order is equivalent to particle diameter, the glass powder of 2.6 micron grain sizes and the better with the consistency of PC of wollastonite, dispersion easily, is used in lighting in LED lamp tube of the present invention effective.
Particularly, the particle diameter of described white carbon black is 30nm, and particle diameter is little, and dispersion effect is good.
Tetraphenyl diphenol A diphosphonate, is called for short BDP, Formula weight 696.04.Colourless transparent liquid, relative density 1.258.Phosphorus content 8.9%.Be dissolved in acetone, toluene etc., be slightly soluble in normal hexane, resistance to water dispersible is good, high temperature resistant, the temperature of 5% mass loss 378 DEG C, low toxicity.
Metaphenylene tetraphenyl diphosphate also claims Resorcinol two (diphenyl phosphoester), and be called for short RDP, it is a mixture, and containing polyphosphate (n>=2) 20%-30%, bisphosphate (n=1) about 70%-80% in industrial RDP, by bisphosphate, molecular formula is C
30h
24o
8p
2, relative molecular mass is 574.43, and theoretical phosphorus content is 10.78%.Water-content≤0.1%, the temperature of acid number≤0.1mgKOH/g, TGA thermal weight loss 5%, 10% and 50% is respectively 307 DEG C, 337 DEG C and 403 DEG C.The viscosity of RDP is very relevant with the content of wherein oligopolymer, and when oligomer content is 27%, bisphosphate content is 71%, TPP content when being 2%, and the coefficient of dynamic viscosity at 40 DEG C and 100 DEG C is respectively 149cts and 1.18cts.The viscosity of general industry product at 25 DEG C is (300-600) mm
2/ s.RDP is compared with general phosphoric acid ester, and thermostability is high, and volatility low (lower than 140Pa when 40 DEG C), transport property is little, and stability to hydrolysis is low.Metaphenylene tetraphenyl diphosphate is with fire-retardant and plasticising function, and major function is plasticising, can be described as flame-retardant plasticizer.
Preferably, described a kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises the raw material of following weight part:
Polycarbonate 85-95 part
Reinforcing aids 8-20 part
Fire retardant 0.5-1.5 part
Light diffusing agent 0.2-1.2 part
Oxidation inhibitor 0.2-1 part.
Wherein, the number-average molecular weight of described polycarbonate is 1.8-3 ten thousand, and shrinking percentage is 0.5-0.7%, and proportion is 1.18-1.2, and linear expansivity is 6.5*10E-5/ DEG C.
Preferably, the number-average molecular weight of described polycarbonate is 2-2.5 ten thousand, and shrinking percentage is 0.5-0.65%, and proportion is 1.18-1.2; More preferably, the number-average molecular weight of described polycarbonate is 2.5 ten thousand, and shrinking percentage is 0.6%, and proportion is 1.2.
Wherein, the width of described flat glass fiber is 16 microns, and thickness is 16 microns, and specific refractory power is 1.52.
The section of glass monfil general on market is circular, the section of the flat glass that the present invention selects is rectangle, specific refractory power is 1.52, this and common PC are more close, be used in PC, transmittance is higher, and surface of the light tube slickness and planeness higher, during lighting, effectiveness comparison is even, and dimensional stability is higher.
Wherein, described reinforcing aids is the mixture of any three kinds or four kinds in flat glass fiber, glass powder, wollastonite, white carbon black, BDP, RDP.
Particularly, described reinforcing aids is the mixture of liquid toughener and solid-state toughener, and liquid toughener is one or both the mixture in BDP, RDP, and solid-state toughener is at least one in flat glass fiber, glass powder, wollastonite, white carbon black.
More specifically, the mixture of described reinforcing aids to be flat glass fiber, wollastonite, BDP with mass ratio be 5-6:4-5:3-5; Or, the mixture of described reinforcing aids to be flat glass fiber, white carbon black, BDP with mass ratio be 9-10:1-3:4-6; Or, the mixture of described reinforcing aids to be flat glass fiber, wollastonite, white carbon black, RDP with mass ratio be 4-6:3-5:0.5-1.5:3-5; Or, the mixture of described reinforcing aids to be flat glass fiber, glass powder, white carbon black, BDP with mass ratio be 5-7:2-4:0.5-1.5:2-4.
As flat glass, wollastonite, BDP compound system, use flat fiberglass reinforced successful, but cost is higher, and surfaceness increase, white carbon black and PC consistency good, but reinforced effects is slightly poor, BDP significantly can improve apparent effect and improve transmittance, but thermal distortion can be low, adopt three composite, while effectively can reducing flat glass consumption, improve consistency, reach good outward appearance, other performances such as thermal distortion simultaneously reduce not obvious, reach over-all properties more excellent.
Wherein, described fire retardant be phenyl polysiloxane crystal, PC carrier tetrafluoroethylene with mass ratio be 2.5:1-4:1 composition mixture.
The composite fire retardant of the present invention is solid organosilicon fire retardant, phenyl polysiloxane crystal, and molecular weight is comparatively large, and better with the consistency of PC, the transparency is good, can accomplish that the transparency and flame retardant resistance are taken into account.And the tetrafluoroethylene of PC carrier uses as anti-dripping agent, there is the transparency and anti-drippage effect.
Wherein, described light diffusing agent is styrene/acrylic acid co-polymer, silicone based a kind of or two kinds of mixtures formed with arbitrary proportion.
Wherein styrene/acrylic acid co-polymer light diffusing agent specific refractory power 1.54, proportion 1.1, particle diameter is 1-5 micron, and this and PC specific refractory power are more close, and guarantee system has higher transmittance; Silicone based specific refractory power 1.43, proportion 1.3, particle diameter is 0.5-2 micron, and specific refractory power and PC difference greatly, ensure higher mist degree; The two is composite can ensure higher transmittance and higher mist degree.
Wherein, the mixture of described oxidation inhibitor to be oxidation inhibitor 627A and irgasfos 168 with mass ratio be 1-5:1-3.
A preparation method for LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and reinforced partly auxiliary agent are carried out blended under agitation 2-5min, obtains blend, then the reinforcing aids of surplus is added in blend and mix, obtain polycarbonate and strengthen material; Particularly, first liquid toughener (BDP and/or RDP) and polycarbonate are carried out blended under agitation, the good mixing effect of liquid toughener and PC, promote surface gloss and the hardness of material, then the solid-state toughener (at least one in flat glass fibre, glass powder, wollastonite, white carbon black) of surplus is added in blend and mix, be uniformly mixed 1-2min, guarantee that solid-state toughener can evenly be bonded in PC surface, the dispersion effect that obtained polycarbonate strengthens material is good.
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 8-15s, stir 8-15s at every turn, stir 2-3 time, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization at 250-290 DEG C, obtains PC matrix material of the present invention.
Wherein, the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, take ethanol as solvent, prepare phenyl polysiloxane crystal by hydrolytic condensation; Wherein phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water, ethanol synthesize according to the ratio of 19.8kg, 15.2kg, 1.8kg, 9.2kg, and employing 1.8Kg distilled water, tetramethoxy-silicane ethanolic soln (15.2kg tetramethoxy-silicane and 4.6kg ethanol) are added drop-wise in phenyltrimethoxysila,e ethanolic soln (19.8kg phenyltrimethoxysila,e and 4.6kg ethanol) respectively.
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 3-4:6-7, then through strong crusher pulverization process; Grinding time 30min, particle diameter is 50-300 micron.
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
Fire retardant of the present invention utilizes pure PTFR and traditional PC material to carry out coated granulation, be conducive to the degraded avoiding PC material, the PC material mixing after the fire retardant obtained and enhancing modified, the transparency of obtained PC matrix material is higher, good flame retardation effect, and anti-drippage is effective.
Beneficial effect of the present invention is:
(1) LED lamp tube low bulk of the present invention fire-retardant light diffusion PC matrix material, reinforcing aids is adopted to carry out enhancing modified to PC, liquid BDP or RDP is used to improve surface gloss and intensity, use homemade organic silicon fibre retardant and PC carrier tetrafluoroethylene composite carry out flame-retardant modified, the auxiliary agents such as styrene/acrylic copolymer light diffusing agent, organosilicon light diffusing agent, oxidation inhibitor, obtain a kind of low bulk fire-retardant light diffusion PC matrix material.
(2) reinforcing aids of the present invention's employing, gives full play to fiber reinforcement effect and keeps transparency simultaneously, improves mechanical property while using powder to strengthen simultaneously; Use liquid reinforcers to improve surface effect and improve the consistency of powder, fiber etc. and PC, the key index such as linear expansivity, shrinking percentage of material is effectively reduced by two kinds or three kinds of compounds, improve intensity, material can be used on large-size and thin-wall product.
(3) the present invention has synthesized a kind of fire retardant, phenyl polysiloxane, reaches better flame retardant effect, keep higher transmittance simultaneously by the PTFE of itself and PC carrier is composite.
(4) preparation method of the present invention is simple, reinforcing aids is first utilized to carry out enhancing modified to PC material, again with blended processing such as homemade fire retardant, light diffusing agent, oxidation inhibitor, powder dispersion is in the plastic improved, improve the performances such as the mechanical property of material, particularly shock strength.The tensile strength of PC matrix material of the present invention is 70-75MPa, elongation at break is 15-20%, flexural strength is 115-125MPa, modulus in flexure is 2800-3000MPa, notched Izod impact strength (23 DEG C) is 120-200J/m, melt flow rate (MFR) (300 DEG C/1.2kg) is 12-18g/10min, flame retardant properties (1.0mm) is V0 level, linear expansivity (/cm/cm/ DEG C,-40 DEG C to 95 DEG C) be 3.10E-05 ~ 4.80E-05, shrinking percentage is 0.3-0.4%, and full light transmittance (1.0mm) is 51-55, and mist degree (1.0mm) is 99-100.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1.
A kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material of the present embodiment, comprises the raw material of following weight part:
Polycarbonate 81 parts
Flat glass fiber 10 parts
White carbon black (30 nanometer) 2 parts
BDP5 part
Styrene-acrylic copolymer light diffusing agent 0.6 part
Organosilicon light diffusing agent 0.4 part
Phenyl silicon crystal fire retardant 1 part
PC carrier PTFE0.5 part
Oxidation inhibitor 627A0.2 part
Irgasfos 168 0.2 part.
A preparation method for LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and BDP are carried out blended under agitation, obtains blend, then flat glass fiber, white carbon black are added in blend and mix, obtain polycarbonate and strengthen material;
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 8s, stir 8s at every turn, stir 2 times, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization, obtains described PC matrix material.
Particularly, the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, prepare phenyl polysiloxane crystal by hydrolytic condensation;
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 3:7, then through strong crusher pulverization process;
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
Embodiment 2.
A kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material of the present embodiment, comprises the raw material of following weight part:
Polycarbonate 83.7 parts
Flat glass fiber 5 parts
Wollastonite (5000 order) 4 parts
White carbon black (30 nanometer) 1 part
RDP4 part
Styrene-acrylic copolymer light diffusing agent 0.4 part
Organosilicon light diffusing agent 0.3 part
Phenyl polysiloxane crystal fire retardant 1 part
PC carrier PTFE0.2 part
Oxidation inhibitor 627A0.2 part
Irgasfos 168 0.2 part.
A preparation method for LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and RDP are carried out blended under agitation, obtains blend, then flat glass fiber, wollastonite, white carbon black are added in blend and mix, obtain polycarbonate and strengthen material;
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 10s, stir 10s at every turn, stir 3 times, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization, obtains described PC matrix material.
Particularly, the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, prepare phenyl polysiloxane crystal by hydrolytic condensation;
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 3.5:6.5, then through strong crusher pulverization process;
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
Embodiment 3.
A kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material of the present embodiment, comprises the raw material of following weight part:
Polycarbonate 84.6 parts
Flat glass fiber 6 parts
3 parts, glass powder (5000 order)
White carbon black (30 nanometer) 1 part
BDP3 part
Styrene-acrylic copolymer light diffusing agent 0.5 part
Organosilicon light diffusing agent 0.1 part
Phenyl polysiloxane crystal fire retardant 1 part
PC carrier PTFE0.2 part
Oxidation inhibitor 627A0.3 part
Irgasfos 168 0.3 part.
A preparation method for LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and BDP are carried out blended under agitation, obtains blend, then flat glass fiber, glass powder, white carbon black are added in blend and mix, obtain polycarbonate and strengthen material;
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 12s, stir 12s at every turn, stir 3 times, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization, obtains described PC matrix material.
Particularly, the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, prepare phenyl polysiloxane crystal by hydrolytic condensation;
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 3:7, then through strong crusher pulverization process;
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
Embodiment 4.
A kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material of the present embodiment, comprises the raw material of following weight part:
Polycarbonate 90 parts
Flat glass fiber 5 parts
2 parts, glass powder
Wollastonite 3 parts
White carbon black 3 parts
RDP6 part
1.2 parts, phenyl polysiloxane crystal
PC carrier tetrafluoroethylene 0.4 part
Styrene/acrylic acid co-polymer fire retardant 0.6 part
Organic silicon fibre retardant 0.5 part
Oxidation inhibitor 627A0.4 part
Irgasfos 168 0.4 part.
A preparation method for LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and RDP are carried out blended under agitation, obtains blend, then by flat glass fiber, glass powder, wollastonite, white carbon black, add in blend and mix, obtain polycarbonate and strengthen and expect;
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 10s, stir 12s at every turn, stir 3 times, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization, obtains described PC matrix material.
Particularly, the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, prepare phenyl polysiloxane crystal by hydrolytic condensation;
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 4:6, then through strong crusher pulverization process;
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
Embodiment 5.
A kind of LED lamp tube low bulk fire-retardant light diffusion PC matrix material of the present embodiment, comprises the raw material of following weight part:
Polycarbonate 95 parts
Flat glass fiber 6 parts
Wollastonite 5 parts
BDP4 part
Phenyl polysiloxane crystal fire retardant 2 parts
PC carrier tetrafluoroethylene fire retardant 0.8 part
Styrene/acrylic acid co-polymer 0.5 part
Silicone based 0.7 part
Oxidation inhibitor 627A0.6 part
Irgasfos 168 0.4 part.
A preparation method for LED lamp tube low bulk fire-retardant light diffusion PC matrix material, comprises following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and BDP agent are carried out blended under agitation, obtains blend, then flat glass fiber, wollastonite are added in blend and mix, obtain polycarbonate and strengthen material;
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 15s, stir 15s at every turn, stir 2 times, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization, obtains described PC matrix material.
Particularly, the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, prepare phenyl polysiloxane crystal by hydrolytic condensation;
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 3:7, then through strong crusher pulverization process;
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
The material performance of the PC matrix material that embodiments of the invention 1-5 obtains is as follows:
。
As can be seen from the above table, the linear expansivity of embodiments of the invention 1 is 3.8E-5/cm/cm/ DEG C, and these data of common PC are 6.8E-5/cm/cm/ DEG C, for the fluorescent tube of a length 1000mm, when temperature-40 DEG C is changed to 95 DEG C, compare general PC, the collapsing length of this system is (95+40) * 3.8E-5*1000=5.13mm, ordinary light diffusion PC collapsing length is (95+40) * 6.8E-5*1000=9.18mm, as can be seen here, telescopic variation difference is at 4.05mm, for longer fluorescent tube, advantage of the present invention is larger, this effectively prevents LED in use due to the change of temperature, fluorescent tube is caused to be out of shape or to cause two ends plug come off or burst, in addition, shrinking percentage is 0.3%, and this is less than 0.6% of common PC, effectively improves the cooled dimensional change of lamp tube formation equally, tensile strength is 72MPa, conventional P C is 60MPa, flexural strength is 120MPa, and general PC is 90MPa, and transmittance and mist degree are compared common PC fluorescent tube and declined not obvious.
It is known that the rest may be inferred, and the linear expansivity of embodiments of the invention 2 is 4.8E-5/cm/cm/ DEG C, and the telescopic variation difference of this system and common PC is at 2.7mm, and the common PC of its shrinkage ratio is little by 0.2%.The linear expansivity of embodiments of the invention 3 is 3.5E-5/cm/cm/ DEG C, and the telescopic variation difference of this system and common PC is at 4.45mm, and the common PC of its shrinkage ratio is little by 0.3%.The account form of embodiments of the invention 4,5 is identical with foregoing, repeats no more here.To sum up can find out, the linear expansivity of the PC matrix material that the present invention obtains is little, and shrinking percentage is little, and flame retardant properties is good, and excellent combination property.
The above embodiment, just better embodiment of the present invention, be not limit the scope of the present invention, therefore all equivalences done according to structure, feature and the principle described in the present patent application the scope of the claims change or modify, and all should comprise in patent claim of the present invention.
Claims (10)
1. a LED lamp tube low bulk fire-retardant light diffusion PC matrix material, is characterized in that: the raw material comprising following weight part:
Polycarbonate 80-100 part
Reinforcing aids 4-25 part
Fire retardant 0.3-3 part
Light diffusing agent 0.2-1.5 part
Oxidation inhibitor 0.2-1 part
Wherein, described reinforcing aids is one or more the mixture in flat glass fiber, glass powder, wollastonite, white carbon black, BDP, RDP;
Wherein, described fire retardant be phenyl polysiloxane crystal, the mixture that mixes with arbitrary proportion of PC carrier tetrafluoroethylene.
2. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, is characterized in that: the raw material comprising following weight part:
Polycarbonate 85-95 part
Reinforcing aids 8-20 part
Fire retardant 0.5-1.5 part
Light diffusing agent 0.2-1.2 part
Oxidation inhibitor 0.2-1 part.
3. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, it is characterized in that: the number-average molecular weight of described polycarbonate is 1.8-3 ten thousand, shrinking percentage is 0.5-0.7%, and proportion is 1.18-1.2, and linear expansivity is 6.5*10E-5.
4. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, is characterized in that: the width of described flat glass fiber is 16 microns, and thickness is 16 microns, and specific refractory power is 1.52.
5. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, is characterized in that: described reinforcing aids is the mixture of any three kinds or four kinds in flat glass fiber, glass powder, wollastonite, white carbon black, BDP, RDP.
6. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, is characterized in that: the mixture that described fire retardant is phenyl polysiloxane crystal, PC carrier tetrafluoroethylene take mass ratio as 2.5:1-4:1 composition.
7. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, is characterized in that: described light diffusing agent is styrene/acrylic acid co-polymer, silicone based a kind of or two kinds of mixtures formed with arbitrary proportion.
8. a kind of LED lamp tube low bulk according to claim 1 fire-retardant light diffusion PC matrix material, is characterized in that: the mixture of described oxidation inhibitor to be oxidation inhibitor 627A and irgasfos 168 with mass ratio be 1-5:1-3.
9. the preparation method of the fire-retardant light diffusion of a kind of LED lamp tube low bulk according to claim 1-8 any one PC matrix material, is characterized in that: comprise following procedure of processing:
Prepare polycarbonate and strengthen material: polycarbonate and reinforced partly auxiliary agent are carried out blended under agitation, obtains blend, then the reinforcing aids of surplus is added in blend and mix, obtain polycarbonate and strengthen material;
Prepare pre-dispersed powder: the fire retardant good by pre-treatment, and light diffusing agent, oxidation inhibitor carry out premix, often stir and once suspend 8-15s, stir 2-3 time, obtain pre-dispersed powder;
Extruding pelletization: polycarbonate enhancing material and pre-dispersed powder are mixed, extruding pelletization, obtains described PC matrix material.
10. the preparation method of a kind of LED lamp tube low bulk according to claim 9 fire-retardant light diffusion PC matrix material, is characterized in that: the pretreatment process of described fire retardant is:
(1) select phenyltrimethoxysila,e, tetramethoxy-silicane, distilled water to be raw material, prepare phenyl polysiloxane crystal by hydrolytic condensation;
(2) add pure PTFE in PC granulation, the mass ratio of obtained PC carrier PTFE, pure PTFE and PC is 3-4:6-7, then through strong crusher pulverization process;
(3) by phenyl polysiloxane crystal and PC carrier PTFE blended, obtained described fire retardant.
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