CN102295829A - High heating transformative halogen free flame retardant material and its preparation method - Google Patents
High heating transformative halogen free flame retardant material and its preparation method Download PDFInfo
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- CN102295829A CN102295829A CN 201110137218 CN201110137218A CN102295829A CN 102295829 A CN102295829 A CN 102295829A CN 201110137218 CN201110137218 CN 201110137218 CN 201110137218 A CN201110137218 A CN 201110137218A CN 102295829 A CN102295829 A CN 102295829A
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Abstract
The invention discloses a high heating transformative halogen free flame retardant material and its preparation method. The flame retardant material contains the following components of: by weight, 20-50 parts of polybutylene telephthalate, 10-40 parts of polyethylene glycol terephthalate, 15-24 parts of an organic phosphatic fire retardant, 1-3 parts of a phosphorous liquid fire retardant, 10-30 parts of glass fiber, and 2-4 parts of inorganic oxide. In comparison with present technologies, the preparation flow of the halogen free flame retardant material is simplified and the production cost of the halogen free flame retardant material by adopting the preparation method of the high heating transformative halogen free flame retardant material provided by the invention. The halogen free flame retardant material provided by the invention is prepared by the use of the components provided by the invention as well as the ratio of the components, and has high heat distortion temperature, high glow-wire temperature, high flame resistance and good mechanical properties in comparison with present flame retardant materials.
Description
Technical field
The present invention relates to the fire retardant material technical field, especially relate to bittern-free flame-proof material of a kind of high thermal distortion and preparation method thereof.
Background technology
Polybutylene terephthalate (PBT, Polybutylene terephthalate) is a kind of translucent to opaque, crystalline thermoplastic polyester by oyster white.It has the low characteristics such as (only being 0.1%) of high heat resistance, toughness, resistance to fatigue, self-lubricating, low-friction coefficient, weathering resistance and water-intake rate.PBT still can keep following various rerum natura in wet environment: electrical insulating property (but volume resistance, dielectric loss big), heat-resisting water, bases, acids, oils.But PBT is subject to halon to be corroded.Its hydrolytic resistance is poor, crystallization rapidly under the low temperature, good forming ability.Also there is undesirable feature in PBT simultaneously, and low as notched Izod impact strength, molding shrinkage is big.Therefore use glass fibre or inorganic filler instead of part PBT always in the fire retardant material in the prior art, to improve tensile strength, flexural strength (can be enhanced about more than once) and the heat-drawn wire of fire retardant material.
Polyethylene terephthalate (PET, Polythylene terephthalate) also is a kind of (principal item) of thermoplastic polyester, is commonly called as polyester resin.It carries out the polycondensate that polycondensation forms by terephthalic acid and ethylene glycol.PET is collectively referred to as thermoplastic polyester or saturated polyester with PBT in the prior art.Wherein, the polymkeric substance of a PET oyster white or faint yellow highly crystalline, surface smoothing and glossy.The creep resistant of PET, fatigue resistance, rub resistance and dimensional stability be good, abrasion are little and the hardness height, have toughness maximum in the thermoplastics; Simultaneously its electrical insulation capability is good, temperature influence is little, nontoxic, weathering resistance, chemical proof good stability, water-intake rate are low, weak acid resistant and organic solvent.
The two belongs to saturated polyester PBT, PET, and good consistency is arranged between the two, and this is one of prerequisite of preparation PBT/PET alloy.The production cost of PET than the production cost of PBT low (produce PET institute spent glycol than the price of producing the used butyleneglycol of PBT almost cheap half), with therefore improving the content of PET at engineering plastics is the production cost best mode that reduces engineering plastics, its cost performance height.But the second-order transition temperature of PET is higher, crystallization velocity is slow, molding cycle is long, shaping cycle is long, molding shrinkage is big, poor dimensional stability, needs could obtain higher heat-drawn wire by nucleator and crystallization promoter.And PBT just in time has the rapid crystalline performance of low temperature, good forming ability.
In sum, if a kind of fire retardant material that comprises PBT and two kinds of saturated polyesters of PET of preparation then is the feasible method that a kind of high-performance and low price have both.But have not yet to see report about the bittern-free flame-proof material that comprises PBT and PET.
Summary of the invention
Bittern-free flame-proof material that provides a kind of high thermal distortion and preparation method thereof is provided main purpose of the present invention, simplifies the preparation flow of bittern-free flame-proof material, improves the over-all properties of bittern-free flame-proof material.
The present invention proposes a kind of high thermal distortion bittern-free flame-proof material, and in mass fraction, this fire retardant material comprises following component:
Polybutylene terephthalate 20-50 part;
Polyethylene terephthalate 10-40 part;
Organophosphate fire retardant 15-24 part;
Phosphorus is liquid flame retardant 1-3 part;
Glass fibre 10-30 part;
Inorganic oxide 2-4 part.
Preferably, described polybutylene terephthalate is 25-40 part;
Described polyethylene terephthalate is 20-30 part.
Preferably, described high thermal distortion bittern-free flame-proof material is characterized in that, also comprises following component:
Silane coupling agent 0.3--0.5 part.
Preferably, described high thermal distortion bittern-free flame-proof material is characterized in that, also comprises following component:
Toughner 3--6 part
Lubricant 0.2--1.0 part
Oxidation inhibitor 0.3--0.8 part.
Preferably, described phosphorus is that liquid flame retardant is one or more of following component: triphenyl phosphite, dihydroxyphenyl propane-two (phosphoric acid hexichol fat), Resorcinol two (diphenyl phosphoester), dimethyl methyl phosphonates.
Preferably, one or more of the following component of described inorganic oxide: zinc oxide, magnesium oxide, aluminium sesquioxide, silicon-dioxide, titanium dioxide.
Preferably, described silane coupling agent is one or both of following component: γ-An Bingjisanyiyangjiguiwan, γ-glycidoxypropyltrime,hoxysilane.
Preferably, described toughner be following component one or more: maleic anhydride grafted polyethylene octene, ethylene-methyl acrylate, ethylene-propylene acid butyl ester, ethylene-acrylate-glycidyl methacrylate terpolymer, styrene butadiene-methyl methacrylate copolymer;
Described lubricant is one or more of following component: ethylene bis stearic acid amide, pentaerythritol stearate, Magnesium Stearate, calcium stearate, barium stearate, oxidized polyethlene wax;
Described oxidation inhibitor is one or more of following component: four (β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid) pentaerythritol ester, the β-positive octadecanol ester of (3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid, three [2.4-di-tert-butyl-phenyl] phosphorous acid ester.
The present invention proposes the method for the described high thermal distortion bittern-free flame-proof material of preparation in addition, and this method may further comprise the steps:
Step 1, with the following component of content defined in the above-mentioned high thermal distortion bittern-free flame-proof material: organophosphate fire retardant, phosphorus are liquid flame retardant, inorganic oxide, under 70-90 ℃ condition high-speed stirring 4-6 minute, form first mixture;
Step 2, with the following component of content defined in the above-mentioned high thermal distortion bittern-free flame-proof material: polybutylene terephthalate, polyethylene terephthalate, under the stirring at low speed condition, mix, form second mixture;
Step 3, first mixture is mixed with second mixture, and stirring at low speed 5-8 minute, granular mixture formed;
Step 4, with the glass fibre of content defined in described granular mixture and the above-mentioned high thermal distortion bittern-free flame-proof material, at 200-260 ℃, rotating speed is that 320-400RPM, vacuum tightness are to form molten mixture under the condition of 0.04-0.075MPa, and cooling obtains solid product under 60-80 ℃ of temperature.
Preferably, the silane coupling agent that has also added content defined in the above-mentioned high thermal distortion bittern-free flame-proof material in the preparation method's of described high thermal distortion bittern-free flame-proof material the step 1.
Preferably, the following component that has also added content defined in the above-mentioned high thermal distortion bittern-free flame-proof material in the preparation method's of described high thermal distortion bittern-free flame-proof material the step 1: toughner, lubricant, oxidation inhibitor.
As from the foregoing, high thermal distortion bittern-free flame-proof material preparation method provided by the invention, prior art has been simplified the preparation flow of bittern-free flame-proof material relatively, has reduced the production cost of bittern-free flame-proof material; The prepared bittern-free flame-proof material of the present invention passes through to adopt the proportioning between component provided by the invention and each component, existing relatively fire retardant material, and its heat-drawn wire, glow wire temperature and flame retardant resistance height, and have the good mechanical performance.
Embodiment
Further specify the present invention below by embodiment and Comparative Examples.
Embodiment 1
Step 1, press specified each component concentration in the table 2, with following each component: organophosphate fire retardant, phosphorus are liquid flame retardant, toughner, lubricant, oxidation inhibitor, inorganic oxide, silane coupling agent at 70-90 ℃, high-speed stirring 4-6 minute, it is mixed form first mixture;
Step 2, press specified each component concentration in the table 2, with following each component: polybutylene terephthalate, polyethylene terephthalate, under the stirring at low speed condition, mix, form second mixture;
Step 3, first mixture and second mixture were stirred 5-8 minute under low-speed conditions, form granular mixture;
Step 4, with described granular mixture with press in the table 2 glass fibre of specifying content, at 200-260 ℃, rotating speed is that 320-400RPM, vacuum tightness are to form molten mixture under the condition of 0.04-0.075MPa, and cooling obtains solid product under 60-80 ℃ of temperature.
The solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2..
In addition, also can be that liquid flame retardant is divided into two parts with phosphorus, in step 1, mix described first mixture of formation with the 1st part with other components.The 2nd part mixed with polybutylene terephthalate, polyethylene terephthalate in step 2 form described second mixture.Wherein first part accounts for the 60-80% that phosphorus is the liquid flame retardant total amount, and second part accounts for the 20-40% that phosphorus is the liquid flame retardant total amount.
Embodiment 2
Press the method for specified each component concentration repetition embodiment 1 in the table 2, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2.
Embodiment 3
Press the method for specified each component concentration repetition embodiment 1 in the table 2, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2.
Embodiment 4
Press the method for specified each component concentration repetition embodiment 1 in the table 2, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2.
Embodiment 5
Press the method for specified each component concentration repetition embodiment 1 in the table 2, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2.
Embodiment 6
Press the method for specified each component concentration repetition embodiment 1 in the table 2, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2.
Embodiment 7
Press the method for specified each component concentration repetition embodiment 1 in the table 3, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 3.
Embodiment 8
Press the method for specified each component concentration repetition embodiment 1 in the table 3, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 3.
Embodiment 9
Press the method for specified each component concentration repetition embodiment 1 in the table 3, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 3.
Embodiment 10
Press the method for specified each component concentration repetition embodiment 1 in the table 3, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 3.
Comparative Examples 1
Press the method for specified each component concentration repetition embodiment 1 in the table 2, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 2.
Comparative Examples 2
Press the method for specified each component concentration repetition embodiment 1 in the table 3, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 3.
Comparative Examples 3
Press the method for specified each component concentration repetition embodiment 1 in the table 3, the solid product that present embodiment is prepared carries out performance measurement according to the described standard of table 1, and measuring result is referring to table 3.
More than described polybutylene terephthalate, polyethylene terephthalate among all Comparative Examples and the embodiment before using respectively by hot-air drier oven dry (130 ℃, be no less than 3 hours), to guarantee that water content is below 0.02%.
From table 2 data presented as can be known, the prepared materials hot deformation temperature of Comparative Examples is lower, and its heat-drawn wire only is 148.1 ℃ under the 1.82MPa pressure condition; The flame retardant properties of the prepared fire retardant material of embodiment and heat-drawn wire are than higher, but poor mechanical property; Embodiment 2 and 3 prepared fire retardant materials have excellent comprehensive performances.The glow wire temperature of embodiment 4 prepared fire retardant materials can be up to 930 ℃; The shock strength of the fire retardant material that embodiment 4 is prepared is the highest, but toughner causes certain bad influence to heat-drawn wire and glow wire temperature.Judge that from overall performance embodiment is a most preferred embodiment, its prepared fire retardant material heat-drawn wire height, glow wire temperature height, flame retardant resistance height, and have the good mechanical performance, can satisfy the practical application of high-end product.
Data presentation from table 3 as can be known, the fire retardant material height that the heat-drawn wire of embodiment 7 prepared fire retardant materials is more prepared than Comparative Examples 2; The fire retardant material height that the heat-drawn wire of embodiment 9 prepared fire retardant materials is more prepared than Comparative Examples 3; Thereby high thermal distortion bittern-free flame-proof material texturing temperature height of the present invention has been described, thereby has enlarged the temperature use range of fire retardant material, can be widely used in the occasion that heatproofs such as junctor, coil rack, socket plate require.
The limiting viscosity of the described polybutylene terephthalate that adopts in above embodiment and the Comparative Examples is 1.00, the limiting viscosity of polyethylene terephthalate is 0.80.Described organophosphate fire retardant is that the Clariant company of Germany produces, and its product grade is Exolit OP1240.Described phosphorus is that liquid flame retardant is homemade commercially available.Described glass fibre is that Tongxiang Jushi Group Co., Ltd. produces, and its product grade is 988A.Ethylene-methyl acrylate in the described toughner is that du pont company is produced, the terpolymer of ethylene-acrylate-glycidyl methacrylate is that French Arkema produces, the terpolymer of styrene butadiene-methyl methacrylate is produced for U.S. Rhom and Hass, and used other toughner of the present invention are homemade commercially available.Described lubricant is homemade commercially available.Described oxidation inhibitor is that Albemarle Corporation produces.Described inorganic oxide is that zinc oxide, magnesium oxide, aluminium sesquioxide, silicon-dioxide are homemade commercially available, and wherein titanium dioxide is du pont company production.Described silane coupling agent is that Dow corning company produces.
Among the above embodiment, described antioxidant 1010 is four (β-(3, the 5-di-tert-butyl-hydroxy phenyl) pentaerythritol ester propionic acid), antioxidant 1076 is β-(3, the 5-di-tert-butyl-hydroxy phenyl) the positive octadecanol ester of propionic acid, oxidation inhibitor 168 are three [2.4-di-tert-butyl-phenyl] phosphorous acid ester.Described POE-g-MAH is the maleic anhydride grafted polyethylene octene.
Should be understood that the present invention can summarize with other the specific form without prejudice to spirit of the present invention or principal character.Therefore, no matter from which point, the above embodiment of the present invention can only be thought can not limit the present invention to explanation of the present invention, claims have been pointed out scope of the present invention, and scope of the present invention is not pointed out in above-mentioned explanation, therefore in implication suitable and any change in the scope, all should think to be included in the scope of claims with claims of the present invention.
Table 1:
Table 2:
Table 3:
Claims (10)
1. one kind high thermal distortion bittern-free flame-proof material, in mass fraction, this fire retardant material comprises following component:
Polybutylene terephthalate 20-50 part;
Polyethylene terephthalate 10-40 part;
Organophosphate fire retardant 15-24 part;
Phosphorus is liquid flame retardant 1-3 part;
Glass fibre 10-30 part;
Inorganic oxide 2-4 part.
2. high thermal distortion bittern-free flame-proof material according to claim 1 is characterized in that,
Described polybutylene terephthalate is 25-40 part;
Described polyethylene terephthalate is 20-30 part.
3. high thermal distortion bittern-free flame-proof material according to claim 1 and 2 is characterized in that, also comprises following component:
Silane coupling agent 0.3--0.5 part.
4. high thermal distortion bittern-free flame-proof material according to claim 3 is characterized in that, also comprises following component:
Toughner 3--6 part
Lubricant 0.2--1.0 part
Oxidation inhibitor 0.3--0.8 part.
5. high thermal distortion bittern-free flame-proof material according to claim 3, it is characterized in that described phosphorus is that liquid flame retardant is one or more of following component: triphenyl phosphite, dihydroxyphenyl propane-two (phosphoric acid hexichol fat), Resorcinol two (diphenyl phosphoester), dimethyl methyl phosphonates.
6. high thermal distortion bittern-free flame-proof material according to claim 3 is characterized in that, one or more of the following component of described inorganic oxide: zinc oxide, magnesium oxide, aluminium sesquioxide, silicon-dioxide, titanium dioxide.
7. high thermal distortion bittern-free flame-proof material according to claim 3 is characterized in that described silane coupling agent is one or both of following component: γ-An Bingjisanyiyangjiguiwan, γ-glycidoxypropyltrime,hoxysilane.
8. high thermal distortion bittern-free flame-proof material according to claim 4, it is characterized in that, described toughner be following component one or more: maleic anhydride grafted polyethylene octene, ethylene-methyl acrylate, ethylene-propylene acid butyl ester, ethylene-acrylate-glycidyl methacrylate terpolymer, styrene butadiene-methyl methacrylate copolymer;
Described lubricant is one or more of following component: ethylene bis stearic acid amide, pentaerythritol stearate, Magnesium Stearate, calcium stearate, barium stearate, oxidized polyethlene wax;
Described oxidation inhibitor is one or more of following component: four (β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid) pentaerythritol ester, the β-positive octadecanol ester of (3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid, three [2.4-di-tert-butyl-phenyl] phosphorous acid ester.
9. prepare the method for the described high thermal distortion bittern-free flame-proof material of claim 1, it is characterized in that, this method may further comprise the steps:
Step 1, with the following component of content that claim 1 limits: organophosphate fire retardant, phosphorus are liquid flame retardant, inorganic oxide, under 70-90 ℃ condition high-speed stirring 4-6 minute, form first mixture;
Step 2, with the following component of content that claim 1 limits: polybutylene terephthalate, polyethylene terephthalate, under the stirring at low speed condition, mix, form second mixture;
Step 3, first mixture is mixed with second mixture, and stirring at low speed 5-8 minute, granular mixture formed;
Step 4, with the glass fibre of described granular mixture and content that claim 1 limits, at 200-260 ℃, rotating speed is that 320-400RPM, vacuum tightness are to form molten mixture under the condition of 0.04-0.075MPa, and cooling obtains solid product under 60-80 ℃ of temperature.
10. the preparation method of high thermal distortion bittern-free flame-proof material according to claim 9 is characterized in that, has also added the silane coupling agent of content that claim 3 limits in the step 1;
The following component that has also added content that claim 4 limits in the step 1: toughner, lubricant, oxidation inhibitor.
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| CN 201110137218 CN102295829A (en) | 2011-05-25 | 2011-05-25 | High heating transformative halogen free flame retardant material and its preparation method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103304898A (en) * | 2013-06-24 | 2013-09-18 | 苏州新区佳合塑胶有限公司 | Antistatic flame retardant PP (polypropylene) material |
| CN103497491A (en) * | 2013-10-14 | 2014-01-08 | 中塑联新材料科技湖北有限公司 | Material for replacing PVC (polyvinyl chloride) profile steel lining |
| CN103554848A (en) * | 2013-10-12 | 2014-02-05 | 中塑联新材料科技湖北有限公司 | Elevator pedal material |
| CN104140655A (en) * | 2014-07-28 | 2014-11-12 | 江阴市龙山合成材料有限公司 | Spraying-free imitative metal PBT and preparation method thereof |
| CN104817833A (en) * | 2015-05-25 | 2015-08-05 | 广东威林工程塑料有限公司 | PET composite material with mosquito repelling effect |
| CN105331055A (en) * | 2015-10-26 | 2016-02-17 | 深圳市兴盛迪新材料有限公司 | PBT composite material used for NMT forming and preparation method thereof |
| CN106380796A (en) * | 2016-08-31 | 2017-02-08 | 广东顺德顺炎新材料股份有限公司 | Low-cost PBT making glowing filaments incombustible at temperature of 870 DEG C in whole process and preparation method thereof |
| CN106380797A (en) * | 2016-08-31 | 2017-02-08 | 广东顺德顺炎新材料股份有限公司 | Flame-retardant and strengthened heating PBT material and preparation method thereof |
| CN107141735A (en) * | 2017-07-05 | 2017-09-08 | 合肥万之景门窗有限公司 | A kind of fire-retardant plastic and preparation method thereof |
| CN107446324A (en) * | 2017-08-02 | 2017-12-08 | 广东锦湖日丽高分子材料有限公司 | A kind of inorganic nano-particle enhancing fire retardant PBT with no halogen material and preparation method thereof |
| WO2022110664A1 (en) * | 2020-11-26 | 2022-06-02 | 金发科技股份有限公司 | Low-smoke density halogen-free flame-retardant reinforced pbt/pet composite, and preparation method therefor and application thereof |
| WO2022110663A1 (en) * | 2020-11-26 | 2022-06-02 | 金发科技股份有限公司 | Low-smoke-density halogen-containing flame-retardance-enhanced pbt/pet composite, preparation method therefor, and use thereof |
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| CN1997698A (en) * | 2004-06-10 | 2007-07-11 | 伊塔尔麦奇化学股份公司 | Polyester compositions flame-retarded with halogen-free additives |
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| CN1997698A (en) * | 2004-06-10 | 2007-07-11 | 伊塔尔麦奇化学股份公司 | Polyester compositions flame-retarded with halogen-free additives |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103304898A (en) * | 2013-06-24 | 2013-09-18 | 苏州新区佳合塑胶有限公司 | Antistatic flame retardant PP (polypropylene) material |
| CN103554848A (en) * | 2013-10-12 | 2014-02-05 | 中塑联新材料科技湖北有限公司 | Elevator pedal material |
| CN103497491A (en) * | 2013-10-14 | 2014-01-08 | 中塑联新材料科技湖北有限公司 | Material for replacing PVC (polyvinyl chloride) profile steel lining |
| CN104140655A (en) * | 2014-07-28 | 2014-11-12 | 江阴市龙山合成材料有限公司 | Spraying-free imitative metal PBT and preparation method thereof |
| CN104140655B (en) * | 2014-07-28 | 2016-01-20 | 江阴市龙山合成材料有限公司 | Exempt to spray imitative metal PBT and preparation method thereof |
| CN104817833A (en) * | 2015-05-25 | 2015-08-05 | 广东威林工程塑料有限公司 | PET composite material with mosquito repelling effect |
| CN105331055A (en) * | 2015-10-26 | 2016-02-17 | 深圳市兴盛迪新材料有限公司 | PBT composite material used for NMT forming and preparation method thereof |
| CN106380796A (en) * | 2016-08-31 | 2017-02-08 | 广东顺德顺炎新材料股份有限公司 | Low-cost PBT making glowing filaments incombustible at temperature of 870 DEG C in whole process and preparation method thereof |
| CN106380797A (en) * | 2016-08-31 | 2017-02-08 | 广东顺德顺炎新材料股份有限公司 | Flame-retardant and strengthened heating PBT material and preparation method thereof |
| CN107141735A (en) * | 2017-07-05 | 2017-09-08 | 合肥万之景门窗有限公司 | A kind of fire-retardant plastic and preparation method thereof |
| CN107446324A (en) * | 2017-08-02 | 2017-12-08 | 广东锦湖日丽高分子材料有限公司 | A kind of inorganic nano-particle enhancing fire retardant PBT with no halogen material and preparation method thereof |
| WO2022110664A1 (en) * | 2020-11-26 | 2022-06-02 | 金发科技股份有限公司 | Low-smoke density halogen-free flame-retardant reinforced pbt/pet composite, and preparation method therefor and application thereof |
| WO2022110663A1 (en) * | 2020-11-26 | 2022-06-02 | 金发科技股份有限公司 | Low-smoke-density halogen-containing flame-retardance-enhanced pbt/pet composite, preparation method therefor, and use thereof |
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Application publication date: 20111228 |