CN102964682B - BDDP (Benzene-1,(1-methyl-eehylidene)bis[(3,-5di-bromo)-4-(2,3-dibrono-propoxy)]) inflaming-retarding polypropylene composite material and preparation method thereof - Google Patents
BDDP (Benzene-1,(1-methyl-eehylidene)bis[(3,-5di-bromo)-4-(2,3-dibrono-propoxy)]) inflaming-retarding polypropylene composite material and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92657—Volume or quantity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a BDDP (Benzene-1,(1-methyl-eehylidene)bis[(3,-5di-bromo)-4-(2,3-dibrono-propoxy)]) inflaming-retarding polypropylene composite material. The BDDP inflaming-retarding polypropylene composite material comprises the following components by weight percent: 50-75% of polypropylene, 15-30% of BDDP, 5-20% of flame retardant synergist and 2-5% of selective additive. A preparation method of the BDDP inflaming-retarding polypropylene composite material comprises the following steps of mixing part of polypropylene and the selective additive in a high-speed mixer, and charging the uniform mixture into a material station A through a transportation pipe; respectively charging BDDP, the flame retardant synergist and residual polypropylene into different material stations B, C and D; inputting the proportions of the materials of the corresponding material stations in a continuous measurement system; and starting the continuous measurement system to simultaneously and continuously add the materials to a material inlet of a double-screw extruder according to the corresponding proportions to carry out continuous granulation. A sample prepared from the BDDP inflaming-retarding polypropylene composite material disclosed by the invention is 127mm in length, 12.7mm in width and 0.6mm in height, can reach a V-0 level flame-retardant effect by referring to a UL94 test method, and meets market requirements; and the BDDP inflaming-retarding polypropylene composite material disclosed by the invention has the advantages of having stable flame retardant effect and good melt index stability, improving the product quality and reducing the production cost.
Description
Technical field
The invention belongs to polymeric material field, be specifically related to a kind of eight bromine flame-retardant polypropylene composite materials and preparation method thereof.
Background technology
Polyolefine, because of its oxygen index 17%-18% only, belongs to combustible material, and in the use of a lot of electrical apparatus insulation materials, flame retardant properties is the prerequisite of its application.In the use of a lot of electrical apparatus insulation materials, need to use the sheet material of extrusion grade, sheet metal thickness 0.6mm-1.0mm, this minimum thickness 1.6mm than UL94 standard testing batten is thinner.If use batten 127mm * 12.7mm * 0.6mm that such sheet material tailors to detect flame retardant effect with reference to the testing method of UL94V-0, be generally difficult to the requirement that reaches fire-retardant.
Polyacrylicly flame-retardant modifiedly mainly by adding fire retardant to make it in when burning, physical-chemical reaction occur, reach fire-retardant object in polypropylene.Polyacrylic fire retardant mainly contains halogen flame retardant series and halogen-free flameproof series, and the bromine that main product still be take in halogen flame retardant product is at present fire-retardant as main.Wherein eight bromo ether, claims again tetrabromo-bisphenol (2,3 one dibromopropyl) ether, is called for short BDDP.Because its high efficiency flame retardance is widely used in polypropylene fire retardant product, generally can meet UL94 standard model is the V-0 grade standard of 127mm * 12.7mm * 1.6mm.Therefore, need so a material, batten 127mm * 12.7mm * 0.6mm detects with reference to the testing method of UL94 the flame retardant effect that reaches V-0 grade, meets the need of market.
In addition, on market, conventional BDDP is white powder, particle diameter: 30 μ m～100 μ m, fusing point: 105 ℃～110 ℃ left and right.In twin screw extruder blending and modifying process, easily in mixer, caking is clamminess in charging line and the position such as forcing machine opening for feed.Cause BDDP to join in polypropylene material unstable.In caking process, the ratio that BDDP joins in polypropylene composite material will correspondingly reduce, and the fire-retardant stability of this product will reduce; When luming to a certain extent, from coming off, sticky wall enters into after twin screw blend, instantaneous will correspondingly the having more much of fire retardant ratio of this product, cause in Blending Processes polypropylene plasticizing bad, further impact causes to produce and interrupts, thereby increases production cost, simultaneously, the instantaneous content of BDDP increases, and causes matrix material molten finger to be improved, thereby affected the molten stability referring to of this matrix material, to have influence in the extrusion board molding procedure of downstream sheet metal thickness all even fire-retardant stable.
Summary of the invention
In order to overcome the problem of prior art, the object of the present invention is to provide a kind of eight bromine flame-retardant polypropylene composite materials, the exemplar length that this matrix material makes * wide * height is 127mm * 12.7mm * 0.6mm, testing method with reference to UL94 detects the flame retardant effect that can reach V-0 grade, and stable, the molten good stability that refers to of its flame retardant effect.
Another object of the present invention is to provide the preparation method of above-mentioned eight bromine flame-retardant polypropylene composite materials, the method is easy to processing, and production cost is lower.
The present invention is achieved through the following technical solutions:
Eight bromine flame-retardant polypropylene composite materials, by weight percentage, comprise following component:
Polypropylene 50% ~ 75%
BDDP 15%~30%
Synergistic flame retardant 5% ~ 20%
Selectivity auxiliary agent 2% ~ 5%
Wherein, described polypropylene is extrusion grade particulate state polypropylene, and according to the non-enhancing analog thermoplastic of ISO plastic testing standard, melting index, at 230 ℃, is 0.8 ~ 3g/10min under 2.16kg load-up condition;
Described BDDP is that starting material are through fragmentation, the particulate state eight bromo ether that the particle diameter that screening program obtains is 2mm ~ 4mm.
Described synergistic flame retardant is antimony type oxide or the barium metaborates such as antimonous oxide, antimony peroxide.
Described selectivity auxiliary agent comprises one or more the mixture in oxidation inhibitor, lubricant, acid-acceptor or the anti-precipitation agent of industrial general.
Described oxidation inhibitor is the Hinered phenols antioxidants such as 2,6 di tert butyl 4 methyl phenol or 2,2 ‵-methylene-bis (4-methyl-6-tert-butylphenol).
Described lubricant is the stearic acid lubricants such as calcium stearate, Zinic stearas.
Described acid-acceptor is MgO, CaO, ZnO, Ca(OH)
2deng alkali or alkaline metal oxide.
The linking agents such as described anti-precipitation agent is dicumyl peroxide.
The preparation method of eight bromine flame-retardant polypropylene composite materials of the present invention, comprises the following steps:
A) polypropylene segment and selectivity auxiliary agent are mixed in high-speed mixer, the mixing material mixing is sent in the A of material station by transport pipe, described polypropylene segment accounts for the 20wt%～50wt% of polypropylene total amount;
B) BDDP, synergistic flame retardant and remainder polypropylene are dropped in different material station B, C and D respectively, described remainder polypropylene accounts for the 50wt%～80wt% of polypropylene total amount;
C) the ratio A:20wt% ~ 31wt% of input corresponding material station material used in continuous metering system; B:15wt% ~ 30wt%; C:5wt% ~ 20wt%; D:25wt% ~ 60wt%;
D) start continuous metering system, corresponding material is joined to twin-screw extrusion machine inlet capable simultaneously continuously according to proportion requirement corresponding in step (c);
E) twin screw extruder continuous granulation, double-screw extruder screw length-to-diameter ratio: 40:1, screw speed 450 ~ 500rpm/min, devolatilization vacuum tightness-0.08 ~-0.1MPa; 100 ℃ ~ 180 ℃ of twin screw extruder temperature ranges; The combination of twin screw extruder screwing element is with shearing strong engaged element and toothed disc.
Described in step a), the rotating speed of high-speed mixer is 450rpm/min ~ 550rpm/min, and rate of feeding is 500kg/h～850kg/h, and devolatilization vacuum tightness is-0.08MPa～-0.1MPa.
In step c) and step d), continuous metering system is weight-loss type continuous metering system, belt-type continuous metering system or pump formula continuous metering system.
The present invention compared with prior art, has following beneficial effect:
The exemplar length that the eight bromine flame-retardant polypropylene composite materials that the present invention prepares make * wide * height is 127mm * 12.7mm * 0.6mm, testing method with reference to UL94 detects the flame retardant effect that can reach V-0 grade, meet the need of market, and stable, the molten good stability that refers to of its flame retardant effect, improve quality product, reduced production cost.
Accompanying drawing explanation
Fig. 1 is the probability graph of the molten finger of embodiment 1 and comparative example 1.
Fig. 2 is the probability graph of the molten finger of embodiment 2 and comparative example 2.
Fig. 3 is the probability graph of the molten finger of embodiment 3 and comparative example 3.
Embodiment
Below by embodiment, further illustrate the present invention, following examples are the concrete embodiment of the present invention, but embodiments of the present invention are not subject to the restriction of following embodiment.
The present invention adopts the major equipment of producing product:
Kodak high-speed mixer: 400L, rotating speed 450rpm/min ~ 550rpm/min, rate of feeding: 500kg/h～850kg/h, devolatilization vacuum tightness :-0.08MPa～-0.1MPa.
Twin screw extruder: Nanjing Ou Li TSE-75D/600-250-40 parallel dual-screw extruding machine
Continuous metering system: Bradley originally reaches.
embodiment 1:
100kg polypropylene GRANULES (melting index (0.8-1.5) g/10min) and 15kg selectivity auxiliary agent are put into mixing 30s in high-speed mixer; One co-blended 20 times, is transported to mixture pipeline in feeding station A, and operate continuously guarantees in feeding station A not fracture of material; By 3 tons of BDDP(particulate state 2mm-4mm), 1 ton of antimonous oxide and 3.7 tons of polypropylene put into respectively in feeding station B, C and D; In weight-loss type continuous metering system, set A, B, C, weight-loss metering scale a, b, c, d ratio that D feeding station is corresponding are respectively 23%, 30%, 10%, 37%; Start weight-loss metering scale a, b, c, d, corresponding material is joined to TSE-75D twin-screw extrusion machine inlet capable according to proportion requirement corresponding in above-mentioned steps simultaneously continuously according to the speed of 650kg/h; Each warm area Temperature Setting of twin screw extruder: 100 ℃, 160 ℃, 180 ℃, 180 ℃, 180 ℃, 180 ℃, 170 ℃, 160 ℃, 180 ℃, 180 ℃, double-screw extruder screw length-to-diameter ratio 40:1, screw speed 500rpm, devolatilization vacuum tightness-0.09MPa, continuously extruding pelletization; Produce midway every about 36min sampling once, sample altogether 25 times.Detect the molten finger of sample and burning grade, test result is as shown in table 1, and the molten probability graph referring to as shown in Figure 1.
comparative example 1:
BDDP adopts conventional white powder eight bromo ether on market, particle diameter: 30 μ m～100 μ m, and all the other are with embodiment 1, and test result is as shown in table 1, and the molten probability graph referring to is as shown in Figure 1.
embodiment 2:
By 75kg polypropylene GRANULES (melting index (2-3) g/10min), 10kg selectivity auxiliary agent and 15kg talcum powder (1250 order) are put into mixing 30s in high-speed mixer; One co-blended 20 times, is transported to mixture pipeline in feeding station A, and operate continuously guarantees in feeding station A not fracture of material; By 1.5 tons of BDDP(particulate state 2mm-4mm), 0.5 ton of antimonous oxide and 6 tons of polypropylene put into respectively in feeding station B, C and D; In weight-loss type continuous metering system, set A, B, C, weight-loss metering scale a, b, c, d ratio that D feeding station is corresponding are respectively 20%, 15%, 5%, 60%; Start weight-loss metering scale a, b, c, d, corresponding material is joined to TSE-75D twin-screw extrusion machine inlet capable according to proportion requirement corresponding in above-mentioned steps simultaneously continuously according to the speed of 850kg/h; Each warm area Temperature Setting of twin screw extruder: 100 ℃, 160 ℃, 180 ℃, 180 ℃, 180 ℃, 180 ℃, 170 ℃, 160 ℃, 180 ℃, 180 ℃, double-screw extruder screw length-to-diameter ratio 40:1, screw speed 550rpm, devolatilization vacuum tightness-0.1MPa, continuously extruding pelletization; Produce midway every about 28min sampling once, sample altogether 25 times.Detect the molten finger of sample and burning grade, test result is as shown in table 2, and the molten probability graph referring to as shown in Figure 2.
comparative example 2:
BDDP adopts conventional white powder eight bromo ether on market, particle diameter: 30 μ m～100 μ m, and all the other are with embodiment 2, and test result is as shown in table 2, and the molten probability graph referring to is as shown in Figure 2.
embodiment 3:
By 100kg polypropylene GRANULES (melting index (1.2-2.2) g/10min), 20kg selectivity auxiliary agent and 4kg black Masterbatch are put into mixing 30s in high-speed mixer; One co-blended 25 times, is transported to mixture pipeline in feeding station A, and operate continuously guarantees in feeding station A not fracture of material; By 2.4 tons of BDDP(particulate state 2mm-4mm), 2 tons of antimonous oxides and 2.5 tons of polypropylene put into respectively in feeding station B, C and D; In pump formula continuous metering system, set A, B, C, pump formula weigher a, b, c, d ratio that D feeding station is corresponding are respectively 31%, 24%, 20%, 25%; Ejector priming formula weigher a, b, c, d, simultaneously continuously join TSE-75D twin-screw extrusion machine inlet capable according to proportion requirement corresponding in above-mentioned steps according to the speed of 500kg/h by corresponding material; Each warm area Temperature Setting of twin screw extruder: 100 ℃, 160 ℃, 180 ℃, 180 ℃, 180 ℃, 180 ℃, 170 ℃, 160 ℃, 180 ℃, 180 ℃, double-screw extruder screw length-to-diameter ratio 40:1, screw speed 450rpm, devolatilization vacuum tightness-0.08MPa, continuously extruding pelletization; Produce midway every about 48min sampling once, sample altogether 25 times.Detect the molten finger of sample and burning grade, test result is as shown in table 3, and the molten probability graph referring to as shown in Figure 3.
comparative example 3:
By 50kg polypropylene GRANULES (melting index (1.2-2.2) g/10min), 5kg selectivity auxiliary agent, 4kg black Masterbatch, 24kg BDDP(particulate state 2mm-4mm), 20kg antimonous oxide is put into and is mixed 30s in high-speed mixer, by pump formula weigher, with the speed of 500kg/h, joins continuously TSE-75D twin-screw extrusion machine inlet capable, and all the other are with embodiment 3, test result is as shown in table 3, and the molten probability graph referring to as shown in Figure 3.
Each performance test standard:
Melting index: according to the non-enhancing analog thermoplastic of ISO plastic testing standard, at 230 ℃, test under 2.16kg load-up condition.
Combustion testing: with reference to the testing method of UL94V-0, the exemplar of use length * wide * height is 127mm * 12.7mm * 0.6mm.For batten test result, meet following all conditions, think that this batten meets UL94 V-0 grade, is labeled as OK, otherwise is labeled as NG.
Condition 1: after test flame is taken away, still have flare burning over 10 seconds without any sample;
Condition 2: for 5 samples of every cover, after lighting for 10 times, with total time of the burning of flare over 50 seconds;
Condition 3: burn on fixture always and (include the burning of flare and rubescent burning) without any sample;
Condition 4: without any sample, the drop that burning is melted drips and lighted the cotton at 12`` place below;
Condition 5: without any sample, after removing test flame for the second time, continue rubescent burning over 30 seconds.
the test result of 25 samples in table 1 embodiment 1 and comparative example 1
In table: OK is qualified for burning; NG is defective for burning.Rong Zhi unit: g/10min.
the test result of 25 samples in table 2 embodiment 2 and comparative example 2
In table: OK is qualified for burning; NG is defective for burning.Rong Zhi unit: g/10min.
By the test result in above-mentioned table 1 and table 2, can find out, stable, the molten finger good stability of matrix material flame retardant effect that the present invention adopts particle diameter to prepare at the BDDP of 2mm-4mm, thus improve the quality of products, reduced production cost.
the test result of 25 samples in table 3 embodiment 3 and comparative example 3
In table: OK is qualified for burning; NG is defective for burning.Rong Zhi unit: g/10min.
Test result by above-mentioned table 3 can find out, adopts stable, the molten good stability that refers to of flame retardant effect of the matrix material that preparation method of the present invention prepares compared with a step mixed melting.
Claims (9)
1. eight bromine flame-retardant polypropylene composite materials, is characterized in that, by weight percentage, comprise following component:
Polypropylene 50% ~ 75%
BDDP 15%~30%
Synergistic flame retardant 5% ~ 20%
Selectivity auxiliary agent 2% ~ 5%
Wherein, described polypropylene is extrusion grade particulate state polypropylene, and according to the non-enhancing analog thermoplastic of ISO plastic testing standard, melting index, at 230 ℃, is 0.8 ~ 3g/10min under 2.16kg load-up condition;
Described BDDP is that starting material are through fragmentation, the particulate state eight bromo ether that the particle diameter that screening program obtains is 2mm ~ 4mm;
Its preparation method, comprises the following steps:
A) polypropylene segment and selectivity auxiliary agent are mixed in high-speed mixer, the mixing material mixing is sent in the A of material station by transport pipe, described polypropylene segment accounts for the 20wt%～50wt% of polypropylene total amount;
B) BDDP, synergistic flame retardant and remainder polypropylene are dropped in different material station B, C and D respectively, described remainder polypropylene accounts for the 50wt%～80wt% of polypropylene total amount;
C) the ratio A:20wt% ~ 31wt% of input corresponding material station material used in continuous metering system; B:15wt% ~ 30wt%; C:5wt% ~ 20wt%; D:25wt% ~ 60wt%;
D) start continuous metering system, corresponding material is joined to twin-screw extrusion machine inlet capable simultaneously continuously according to proportion requirement corresponding in step (c);
E) twin screw extruder continuous granulation, double-screw extruder screw length-to-diameter ratio: 40:1, screw speed 450 ~ 500rpm/min, devolatilization vacuum tightness-0.08 ~-0.1MPa; 100 ℃ ~ 180 ℃ of twin screw extruder temperature ranges; The combination of twin screw extruder screwing element is with shearing strong engaged element and toothed disc.
2. eight bromine flame-retardant polypropylene composite materials according to claim 1, is characterized in that, described synergistic flame retardant is antimonous oxide, antimony peroxide or barium metaborate.
3. eight bromine flame-retardant polypropylene composite materials according to claim 1, is characterized in that, described selectivity auxiliary agent comprises one or more the mixture in oxidation inhibitor, lubricant, acid-acceptor or anti-precipitation agent.
4. eight bromine flame-retardant polypropylene composite materials according to claim 3, is characterized in that, described oxidation inhibitor is 2,6 di tert butyl 4 methyl phenol or 2,2 ‵-methylene-bis (4-methyl-6-tert-butylphenol); Described lubricant is calcium stearate or Zinic stearas; Described acid-acceptor is MgO, CaO, ZnO or Ca(OH)
2; Described anti-precipitation agent is dicumyl peroxide.
5. eight bromine flame-retardant polypropylene composite materials according to claim 1, is characterized in that, described matrix material also comprises 0%～10% weighting agent and tinting material.
6. eight bromine flame-retardant polypropylene composite materials according to claim 5, is characterized in that, described weighting agent is talcum powder, and described tinting material is toner.
7. the preparation method of eight bromine flame-retardant polypropylene composite materials described in claim 1-6 any one, is characterized in that, comprises the following steps:
A) polypropylene segment and selectivity auxiliary agent are mixed in high-speed mixer, the mixing material mixing is sent in the A of material station by transport pipe, described polypropylene segment accounts for the 20wt%～50wt% of polypropylene total amount;
B) BDDP, synergistic flame retardant and remainder polypropylene are dropped in different material station B, C and D respectively, described remainder polypropylene accounts for the 50wt%～80wt% of polypropylene total amount;
C) the ratio A:20wt% ~ 31wt% of input corresponding material station material used in continuous metering system; B:15wt% ~ 30wt%; C:5wt% ~ 20wt%; D:25wt% ~ 60wt%;
D) start continuous metering system, corresponding material is joined to twin-screw extrusion machine inlet capable simultaneously continuously according to proportion requirement corresponding in step (c);
E) twin screw extruder continuous granulation, double-screw extruder screw length-to-diameter ratio: 40:1, screw speed 450 ~ 500rpm/min, devolatilization vacuum tightness-0.08 ~-0.1MPa; 100 ℃ ~ 180 ℃ of twin screw extruder temperature ranges; The combination of twin screw extruder screwing element is with shearing strong engaged element and toothed disc.
8. the preparation method of eight bromine flame-retardant polypropylene composite materials according to claim 7, it is characterized in that, described in step a), the rotating speed of high-speed mixer is 450rpm/min ~ 550rpm/min, and rate of feeding is 500kg/h～850kg/h, and devolatilization vacuum tightness is-0.08MPa～-0.1MPa.
9. the preparation method of eight bromine flame-retardant polypropylene composite materials according to claim 7, is characterized in that, in step c) and step d), continuous metering system is weight-loss type continuous metering system, belt-type continuous metering system or pump formula continuous metering system.
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| CN104804300A (en) * | 2015-03-23 | 2015-07-29 | 苏州威瑞成新材料有限公司 | Halogen-free and flame-retardant PP (polypropylene) material with high toughness |
| CN106916374A (en) * | 2017-03-20 | 2017-07-04 | 上海金发科技发展有限公司 | A kind of double screw extruder shear strength detection modified polypropene and preparation method thereof |
| CN109161094B (en) * | 2018-07-09 | 2021-04-13 | 金发科技股份有限公司 | Flame-retardant polypropylene material and preparation method and application thereof |
| CN114874538A (en) * | 2022-03-31 | 2022-08-09 | 江苏金发科技新材料有限公司 | Eight-bromine flame-retardant polypropylene master batch and preparation method and application thereof |
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| CN1769341A (en) * | 2005-10-18 | 2006-05-10 | 贵州省材料技术创新基地 | Nanometer aging-resistant flame-proof profax resin composition |
| CN101475717A (en) * | 2008-01-04 | 2009-07-08 | 金发科技股份有限公司 | Flame-retardant polypropelene composition and preparation thereof |
| CN102731899A (en) * | 2012-06-08 | 2012-10-17 | 佛山市顺德区圆融新材料有限公司 | Inflaming retarding polypropylene composite material |
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