CN109280299A

CN109280299A - PVC Sheathing Compound pellet and preparation method thereof

Info

Publication number: CN109280299A
Application number: CN201811297581.4A
Authority: CN
Inventors: 施民; 施一民
Original assignee: Hangzhou Yile Rubber And Plastic Co Ltd
Current assignee: Hangzhou Yile Rubber And Plastic Co Ltd
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2019-01-29
Anticipated expiration: 2038-11-01
Also published as: CN109280299B

Abstract

The invention discloses a kind of PVC Sheathing Compound pellets and preparation method thereof, belong to pvc material processing technique field, a kind of PVC Sheathing Compound pellet, based on parts by weight, including 50 parts of polyvinyl chloride resin, 8-12 parts of filler, 20-30 parts of plasticizer, 4-6 parts of fire retardant, 2-4 parts of antismoke agent, 0.8-1 parts of retardant synergist, 2-3 parts of stabilizer and 0.4-0.6 parts of lubricant；The fire retardant includes modified aluminium hydroxide, cuprous oxide and the tin oxide that weight fraction ratio is 3:1:1；The antismoke agent includes molybdenum trioxide, ferrocene and the zinc borate that weight fraction ratio is 4:1:1.The present invention passes through modified aluminium hydroxide, the cuprous oxide, tin oxide in fire retardant, it is matched with molybdenum trioxide, ferrocene, the zinc borate in antismoke agent, the flame retardant effect of PVC pellet can be improved, reduce smoke density, and PVC material is made to remain to that there is good mechanical property.

Description

PVC Sheathing Compound pellet and preparation method thereof

Technical field

The present invention relates to pvc material processing technique fields, more specifically, it is related to a kind of PVC Sheathing Compound grain Material and preparation method thereof.

Background technique

Polyvinyl chloride (PVC) is a kind of common plastics, and raw material includes polyvinyl chloride resin, plasticizer, filler and prevents old Agent because its is cheap, and has good waterproofness, resistance to chemical corrosion and insulating properties, is widely used in automobile In gadget.With the frequent generation of fire incident in recent years, to polrvinyl chloride product, there has also been the requirements of anti-flammability, due to polychlorostyrene The oxygen index (OI) of vinyl itself is 45%, has anti-flammability, as fire proofing with good advantage, but due to It usually requires that plasticizer is added in PVC product, the addition of plasticizer can make the oxygen index (OI) of polyvinyl chloride drop to 20% or so, greatly Its fire-retardant effect is reduced greatly；Further, since the thermal stability of polyvinyl chloride is very poor, will decompose at 100 DEG C or so, A large amount of smog is generated when decomposition, and in fire fatality personnel, 80% or more people is because sucking excessive toxic gas And suspended particulate causes to suffocate and die；Therefore the polyvinyl chloride of exploitation flame retardancy and smoke suppression is current hot spot.

Common PVC material can generate a large amount of smog in burning, and maximum smoke density is up to 720, ranks in the plastic The umber one；Cigarette is usually material thermal decomposition or thin and dispersion the solid or liquid to suspend in the cavities that imperfect combustion generates Grain, aflame cigarette includes black smoke and white cigarette, and black smoke refers to the solid particle to suspend in combustion gas product under anoxic conditions, White cigarette is the aerial molecule of the suspension such as steam condensation object.

Be mainly at present that fire retardant is added in polyvinyl chloride resin to the fire-retardant means of PVC, then with other auxiliary agents After being kneaded, squeezing out, PVC material is obtained；Since the fire retardant of organic can generate other noxious materials in burning, because This is mainly the fire retardant of inorganic currently used for the fire retardant of high molecular material.

Inorganic fire retardants can be divided into flame retardant filler and auxiliary flame retardant；Flame retardant filler mainly have aluminium hydroxide, The metal oxides such as magnesium hydroxide calcium carbonate, auxiliary flame retardant have antimony system, tin system and boron system etc.；Wherein, due to flame resistant filler Agent it is cheap, do not generate secondary pollution, be the fire retardant that largely uses at present；But since flame retardant filler is to pass through gold Belong to the cover film that oxide generates and comburant is made to completely cut off air, to achieve the purpose that fire-retardant, therefore metal oxide conduct When fire-proof smoke suppressor, additional amount has to bigger, and the metal oxide that can just play a role, but largely add can damage again The mechanical property of PVC product influences the quality of product；Further, since metal oxide is to absorb heat to generate vapor by burning And carry out fire-retardant, but in this vapor light transmittance can again declined, white cigarette increases, and reduces visibility, is unfavorable in fire The escape of personnel, therefore traditional flame retardant filler still has many flaws.

Therefore how while reducing PVC material smoke density, the loss to the mechanical property of product is reduced, is a need It solves the problems, such as.

Summary of the invention

One of the objects of the present invention is to provide a kind of PVC Sheathing Compound pellets, pass through the modification hydrogen-oxygen in fire retardant Change aluminium, cuprous oxide, tin oxide, is matched with molybdenum trioxide, ferrocene, the zinc borate in antismoke agent, PVC pellet can be improved Flame retardant effect, reduce smoke density, and remain to that there is good mechanical property.

Above-mentioned technical purpose of the invention has the technical scheme that

A kind of PVC Sheathing Compound pellet, based on parts by weight, including 50 parts of polyvinyl chloride resin, 8-12 parts of filler, plasticizer 20-30 Part, 4-6 parts of fire retardant, 2-4 parts of antismoke agent, 0.8-1 parts of retardant synergist, 2-3 parts of stabilizer and 0.4-0.6 parts of lubricant； The fire retardant includes modified aluminium hydroxide, cuprous oxide and the tin oxide that weight fraction ratio is 3:1:1；The antismoke agent packet Include molybdenum trioxide, ferrocene and the zinc borate that weight fraction ratio is 4:1:1.

By using above-mentioned technical proposal, the modified aluminium hydroxide of partial size very little is used in fire retardant, can increase its table Area can reach fire-retardant well by the collaboration of modified aluminium hydroxide, cuprous oxide and tin oxide when dosage is smaller Effect, flame retarding efficiency with higher；Influence when avoiding metal oxide additive amount excessive, to PVC mechanical property；Antismoke agent In molybdenum trioxide, ferrocene and the zinc borate smog that generates when can effectively reduce polyvinyl chloride burning, and can be with Playing enhances fire-retardant effect.

The present invention is further arranged to: the modified aluminium hydroxide is prepared with the following method: based on parts by weight, to 40 20 parts of aluminium hydroxides are added in part isopropanol, 5-10min is stirred to it with the speed of 2000r/min；It then proceedes to that 0.3- is added 0.4 part of aluminate coupling agent and 0.2-0.24 parts of hexadecyl trimethoxy silanes, are warming up to 100-110 DEG C, continue to stir 20min after being cooled to room temperature, obtains mixture；After mixture is ground 1-1.5h again, 100-120 DEG C at a temperature of, it is dry 3-4h is cooled to room temperature to get modified aluminium hydroxide.

By using above-mentioned technical proposal, aluminium hydroxide passes through after surface modification treatment, obtains modified aluminium hydroxide, energy Enough increase its surface area, in smaller dosage, can be obtained biggish flame retarding efficiency；Its dosage is reduced, can be reduced because of addition Metal oxide and loss to polrvinyl chloride product mechanical property.

The present invention is further arranged to: the retardant synergist be weight fraction ratio be 2:1:1 nickel acetylacetonate, molybdic acid Ammonium and chlorinated paraffin.

It, can be into one when nickel acetylacetonate, ammonium molybdate and chlorinated paraffin are used in compounding by using above-mentioned technical proposal Step improves the flame retardant property of polyvinyl chloride, reduces the smoke density of polyvinyl chloride, the stretching that polyvinyl chloride additionally can be improved is strong Degree, bending property and shock resistance, make up loss of the addition of metal oxide in fire retardant to polyvinyl chloride performance.

The present invention is further arranged to: the plasticizer be weight fraction ratio be 1.5:1 dioctyl terephthalate with And diisooctyl phthalate.

By using above-mentioned technical proposal, dioctyl terephthalate (DOTP) is a kind of performance of igelite Excellent primary plasticizer when its diisooctyl phthalate (DOP) is used together, has synergistic effect, polychlorostyrene can be improved Heat resistance, cold resistance, difficult volatilization, flexibility and the electrical insulation capability of vinyl-products, can be obviously improved in polrvinyl chloride product Persistence.

The present invention is further arranged to: the stabilizer is calcium zinc stabilizer.

By using above-mentioned technical proposal, calcium zinc stabilizer is main component by calcium salt, zinc salt, lubricant, antioxidant etc. It is combined, is a kind of good non-toxic stabilizer, in the process of polyvinyl chloride resin, have dispersed, compatible well Property and processing fluidity, can improve the thermal stability of PVC.

The present invention is further arranged to: the filler is one of calcium carbonate and talcum powder or theirs is compound.

By using above-mentioned technical proposal, the addition of filler can be improved the hardness of PVC product and reduce cost.

The present invention is further arranged to: the lubricant be weight ratio be 3:1:1 polyethylene wax, microwax, erucic acid acyl Amine.

By using above-mentioned technical proposal, polyethylene wax (PE wax) have excellent cold resistance, heat resistance, chemical resistance with And wearability, the gloss and processing performance of PVC product can be increased；The processability of PVC can be improved in microwax odorless, tasteless Energy；Erucyl amide has good thermal stability, the ageing-resistant performance of PVC product can be improved, and non-toxic and tasteless, belongs to green and helps Agent；By the compound of polyethylene wax, microwax and erucyl amide, synergistic effect can be played, improves the heat-resisting of PVC product Property, improve the processing performance of PVC product, improves the surface gloss of product；Furthermore in order to improve product hardness and reduce at This, needs to add filler in PVC product, but the addition of filler will affect the lustrous surface of PVC product, and can reduce processing Performance；By the addition of lubricant, filler bring defect can be improved, further increase the quality of PVC product.

The second object of the present invention is to provide a kind of preparation method of PVC Sheathing Compound pellet.

A kind of preparation method of PVC Sheathing Compound pellet, includes the following steps:

(1) proportionally, by polyvinyl chloride resin, plasticizer, fire retardant, antismoke agent, retardant synergist and stabilizer at 20-30 DEG C At a temperature of mix 20-25min, then add remaining raw material, 120-130 DEG C at a temperature of mediate 10-15min, obtain Mixture；

(2) mixture is put into double screw extruder, the temperature setting of double screw extruder an are as follows: area: 110-120 DEG C, two 120-130 DEG C of area, three 130-140 DEG C of areas, four 125-135 DEG C of areas, die temperature are 140 DEG C, revolving speed 30-40r/min, are squeezed out It is granulated, obtains PVC Sheathing Compound pellet.

By using above-mentioned technical proposal, by raw material after mixing, then squeezes out, makes by double screw extruder After grain, cooling, available low-smoke low-halogen PCV pellet has good flame retardant property, can reduce when polyvinyl chloride burns Smoke density, and the reduction of polyvinyl chloride mechanical property will not be caused.

In conclusion the present invention has the advantages that compared with the prior art

1. using the modified aluminium hydroxide of partial size very little in fire retardant, its surface area can be increased, pass through modified aluminium hydroxide, oxygen Change cuprous and tin oxide synergistic effect, can reach good flame retardant effect when dosage is smaller, it is with higher fire-retardant Efficiency；Influence when avoiding metal oxide additive amount excessive, to PVC mechanical property；Molybdenum trioxide, ferrocene in antismoke agent And zinc borate can effectively reduce the smog generated when polyvinyl chloride burning, and can play the fire-retardant effect of enhancing；

2. nickel acetylacetonate, ammonium molybdate and chlorinated paraffin are used in compounding, the anti-flammability of polyvinyl chloride can be further improved Can, the smoke density of polyvinyl chloride is reduced, the tensile strength, bending property and impact resistance of polyvinyl chloride additionally can be improved Can, make up loss of the addition of metal oxide in fire retardant to polyvinyl chloride performance；

3. polyethylene wax, microwax and erucyl amide in use, synergistic effect can be played, improve PVC system as lubricant The heat resistance of product improves the processing performance of PVC product, improves the surface gloss of product.

Specific embodiment

Invention is further described in detail below.

One, the preparation example 1-3 of aluminium hydroxide

Preparation example 1: 20kg aluminium hydroxide is added into 40kg isopropanol, 5min is stirred to it with the speed of 2000r/min；Then 0.3kg aluminate coupling agent and 0.2kg hexadecyl trimethoxy silane are continuously added, is warming up to 100 DEG C, continues to stir 20min after being cooled to room temperature, obtains mixture；After mixture is ground 1h again, 100 DEG C at a temperature of, dry 3h is cooling To room temperature to get modified aluminium hydroxide.

Preparation example 2: 20kg aluminium hydroxide is added into 40kg isopropanol, it is stirred with the speed of 2000r/min 7.5min；It then proceedes to that 0.35kg aluminate coupling agent and 0.22kg hexadecyl trimethoxy silane is added, is warming up to 105 DEG C, continue to stir 20min, after being cooled to room temperature, obtains mixture；After mixture is ground 1.25h again, in 110 DEG C of temperature Under, dry 3.5h is cooled to room temperature to get modified aluminium hydroxide.

Preparation example 3: 20kg aluminium hydroxide is added into 40kg isopropanol, it is stirred with the speed of 2000r/min 10min；It then proceedes to that 0.4kg aluminate coupling agent and 0.24kg hexadecyl trimethoxy silane is added, is warming up to 110 DEG C, continue to stir 20min, after being cooled to room temperature, obtains mixture；After mixture is ground 1.5h again, in 120 DEG C of temperature Under, dry 4h is cooled to room temperature to get modified aluminium hydroxide.

Two, embodiment 1-3

Embodiment 1: a kind of PVC Sheathing Compound pellet is prepared with the following method:

(1) by polyvinyl chloride resin 50kg, dioctyl terephthalate 12kg, diisooctyl phthalate 8kg, modified aluminium hydroxide 3kg, cuprous oxide 1kg, tin oxide 1kg, molybdenum trioxide 1.34kg, ferrocene 0.33kg, zinc borate 0.33kg, nickel acetylacetonate 0.4kg, ammonium molybdate 0.2kg, chlorinated paraffin 0.2kg and calcium zinc stabilizer 2kg 20 DEG C at a temperature of mix 20min, then Filler-calcium carbonate 8kg, polyethylene wax 0.24kg, microwax 0.08kg and erucyl amide 0.08kg are added, in 120 DEG C of temperature Degree is lower to mediate 10min, obtains mixture；

(2) mixture is put into double screw extruder, the temperature setting of double screw extruder an are as follows: area: 110 DEG C, two areas 120 DEG C, three 130 DEG C of areas, four 125 DEG C of areas, die temperature is 140 DEG C, revolving speed 30r/min, and extruding pelletization obtains low smell PVC Material；Wherein modified aluminium hydroxide is selected from modified aluminium hydroxide prepared by preparation example 1.

Embodiment 2: a kind of PVC Sheathing Compound pellet is prepared with the following method:

(1) by polyvinyl chloride resin 50kg, dioctyl terephthalate 15kg, diisooctyl phthalate 10kg, modified aluminium hydroxide 3.75kg, cuprous oxide 1.25kg, tin oxide 1.25kg, molybdenum trioxide 2kg, ferrocene 0.5kg, zinc borate 0.5kg, levulinic Ketone nickel 0.45kg, ammonium molybdate 0.225kg, chlorinated paraffin 0.225kg and calcium zinc stabilizer 2.5kg 25 DEG C at a temperature of mix Then 22.5min adds filler talcum powder 10kg, polyethylene wax 0.3kg, microwax 0.1kg and erucyl amide 0.1kg, 125 DEG C at a temperature of mediate 12.5min, obtain mixture；

(2) mixture is put into double screw extruder, the temperature setting of double screw extruder an are as follows: area: 115 DEG C, two areas 125 DEG C, three 135 DEG C of areas, four 130 DEG C of areas, die temperature is 140 DEG C, revolving speed 35r/min, and extruding pelletization obtains low smell PVC Material；Wherein modified aluminium hydroxide is selected from modified aluminium hydroxide prepared by preparation example 2.

Embodiment 3: a kind of PVC Sheathing Compound pellet is prepared with the following method:

(1) by polyvinyl chloride resin 50kg, dioctyl terephthalate 18kg, diisooctyl phthalate 12kg, modified aluminium hydroxide 4.5kg, cuprous oxide 1.5kg, tin oxide 1.5kg, molybdenum trioxide 2.66kg, ferrocene 0.67kg, zinc borate 0.67kg, acetyl Acetone nickel 0.5kg, ammonium molybdate 0.25kg, chlorinated paraffin 0.25kg and calcium zinc stabilizer 3kg 30 DEG C at a temperature of mix Then 25min adds filler-calcium carbonate 6kg, talcum powder 6kg, polyethylene wax 0.36kg, microwax 0.12kg and erucic acid acyl Amine 0.12kg, 130 DEG C at a temperature of mediate 15min, obtain mixture；

(2) mixture is put into double screw extruder, the temperature setting of double screw extruder are as follows: 120 DEG C of an area, two areas 130 DEG C, three 140 DEG C of areas, four 135 DEG C of areas, die temperature is 140 DEG C, revolving speed 40r/min, and extruding pelletization obtains low smell PVC Material；Wherein modified aluminium hydroxide is selected from modified aluminium hydroxide prepared by preparation example 3.

Three, comparative example 1-7

Comparative example 1: comparative example 1 difference from example 1 is that, modified aluminium hydroxide is replaced with to the common hydrogen-oxygen of equivalent Change aluminium.

Comparative example 2: comparative example 2 is difference from example 1 is that be not added with antismoke agent in raw material.

Comparative example 3: comparative example 3 is difference from example 1 is that the antismoke agent in raw material only includes ferrocene, two cyclopentadienyls The dosage of iron is 2kg.

Comparative example 4: comparative example 4 difference from example 1 is that, in raw material in antismoke agent only comprising molybdenum trioxide with And ferrocene, the dosage of molybdenum trioxide are 1kg, the dosage of ferrocene is 1kg.

Comparative example 5: comparative example 5 is difference from example 1 is that be not added with retardant synergist in raw material.

Comparative example 6: comparative example 6 difference from example 1 is that, the retardant synergist in raw material only includes ammonium molybdate With chlorinated paraffin, the dosage of ammonium molybdate is 0.4kg, and the dosage of chlorinated paraffin is 0.4kg.

Comparative example 7: comparative example 7 is gathered difference from example 1 is that the lubricant in raw material only includes polyethylene wax The dosage of ethylene waxes is 0.4kg.

The formula (unit: kg) of PVC Sheathing Compound pellet in table 1 embodiment 1-3 and comparative example 1-7

Four, performance test: PVC sheet product is made in the embodiment 1-3 and comparative example 1-7 PVC pellet prepared, according to as follows Method is tested for the property, and test result is shown in table 2.

1. oxygen index (OI): according to GB/T2406.2-2009, " plastics oxygen index method measures burning behavior part 2: room temperature is tried Test ", the oxygen index (OI) of PVC product is tested.

2. horizontal firing: according to GB8410-2006 " combustion characteristics of automotive interior material ", the combustion characteristics of interior material Must satisfy following technical requirements: burning velocity is not more than 100mm/min.

3. vertical combustion: right according to UL94-2006 " equipment with Plastics Combustion material combustion testing standard in device " The vertical burn flammability of PVC product can be carried out test.

4. smoke density: according to GB/T8323.2-2008, " plastics cigarette generates part 2: single chamber method measures smoke density test side Method ", smoke density when burning to PVC product is tested.

5. tensile strength: according to GB/T1040.1-2006, " the measurement part 2 of plastic tensile performance: molding and extrusion molding are moulded The experimental condition of material ", the tensile strength of PVC product is tested.

6. elongation at break: according to GB/T1040.1-2006 " the measurement part 2 of plastic tensile performance: molding and extrusion molding The experimental condition of plastics ", the elongation at break of PVC product is tested.

7. cantilever beam impact strength: according to GB/T1843-2008 " measurement of plastics cantilever beam impact strength ", to PVC system The cantilever beam impact strength of product is tested.

8. bending modulus: according to GB/T9341-2008 " measurement of plastics bending property ", to the bending modulus of PVC product It is tested.

9. appearance: by visual observations, grade to the degree of roughness and surface gloss on the surface of PVC product, A: surface is smooth, and glossiness is high；B: surface is smooth, there is certain gloss；C: rough surface, it is matt.

The performance test table of the PVC product of table 2 embodiment 1-3 and comparative example 1-7 preparation

As can be seen from the above data, PVC Sheathing Compound pellet prepared by the present invention has good flame retardant property and smaller Smoke density, and also have good tensile strength, elongation at break, cantilever beam impact strength and bending modulus.

The ultrafine aluminium hydroxide in the present invention, the oxygen index (OI) of PVC product are replaced using common aluminium hydroxide in comparative example 1 It is substantially reduced, and its horizontal firing and vertical combustion performance reduce, illustrates to handle by method of the invention ultra-fine Aluminium hydroxide, specific good flame retardant effect.

Antismoke agent is not used in comparative example 2, the smoke density of PVC product obviously increases, and illustrates that antismoke agent of the invention can be with Effectively reduce smoke density when PVC product burning.

Antismoke agent in comparative example 3 only includes ferrocene, and compared to comparative example 2, the smoke density of PVC decreases, explanation Ferrocene helps to reduce the smoke density of PVC；But it is still higher than the smoke density of PVC in embodiment 1, illustrate ferrocene, three oxidations The compounding effect of molybdenum and zinc borate is more preferable than the effect that ferrocene is used alone.

Antismoke agent in comparative example 4 only includes molybdenum trioxide and ferrocene, and compared to comparative example 2, the smoke density of PVC is It reduces, illustrates the smoke density for facilitating to reduce PVC when molybdenum trioxide and ferrocene are used in compounding；But it is still higher than in embodiment 1 The smoke density of PVC illustrates the compounding effect of ferrocene, molybdenum trioxide and zinc borate compounding better than ferrocene and molybdenum trioxide Effect.

Retardant synergist is not used in comparative example 5, compared to embodiment 1, the oxygen index (OI) of PVC is substantially reduced, and its water Flat burning is reduced with vertical combustion performance, and when saying that retardant synergist and fire retardant are used in compounding, the fire-retardant of PVC can be remarkably reinforced Performance；Furthermore compared to embodiment 1, the tensile strength of PVC, elongation at break, cantilever beam impact strength and bending modulus are equal There is different degrees of reduction, illustrates that retardant synergist can improve the mechanical property of PVC.

It only include ammonium molybdate and chlorinated paraffin in retardant synergist in comparative example 6, compared to comparative example 5, the oxygen of PVC refers to Number obviously increases, and its horizontal firing and vertical combustion performance increase, and illustrate that ammonium molybdate is compounded with chlorinated paraffin with fire retardant In use, can effectively Reinforced PVC flame retardant property；Compared to comparative example 1, the oxygen index (OI) of PVC remains basically stable, but and its Horizontal firing and vertical combustion performance reduce, but the horizontal firing of PVC and vertical combustion performance are still below embodiment 1, say It is bright only when ammonium molybdate, chlorinated paraffin and nickel acetylacetonate are used in compounding, can realize the same of preferable flame retardant effect When, moreover it is possible to the mechanical property of Reinforced PVC.

Lubricant in comparative example 7 only includes polyethylene wax, and compared to embodiment 1, the surface of PVC product is rougher, and Glossiness is not also high, when illustrating that microwax in lubricant, erucyl amide and polyethylene wax are used cooperatively, can be effectively improved product Appearance.

In conclusion the oxygen index (OI) of PVC Sheathing Compound prepared by the present invention is greater than 40, horizontal firing and vertical combustion are equal Meet technical requirements, vertical combustion meets V0 grades of indexs, has good flame retardant effect and lower smoke density；Furthermore lead to Cross the collaboration of fire retardant, antismoke agent and retardant synergist, flame retarding efficiency with higher, it is possible to reduce the dosage of fire retardant, The loss to PVC mechanical property is reduced, the mechanical property of PVC is improved.

This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this All by the protection of Patent Law in the scope of the claims of invention.

Claims

1. a kind of PVC Sheathing Compound pellet, it is characterised in that: based on parts by weight, including 50 parts of polyvinyl chloride resin, 8-12 parts of filler, 20-30 parts of plasticizer, 4-6 parts of fire retardant, 2-4 parts of antismoke agent, 0.8-1 parts of retardant synergist, 2-3 parts of stabilizer and lubricant 0.4-0.6 parts；

The fire retardant includes modified aluminium hydroxide, cuprous oxide and the tin oxide that weight fraction ratio is 3:1:1；

The antismoke agent includes molybdenum trioxide, ferrocene and the zinc borate that weight fraction ratio is 4:1:1.

2. PVC Sheathing Compound pellet according to claim 1, it is characterised in that: the modified aluminium hydroxide is using as follows Method preparation: based on parts by weight, 20 parts of aluminium hydroxides is added into 40 parts of isopropanols, it is stirred with the speed of 2000r/min Mix 5-10min；It then proceedes to that 0.3-0.4 parts of aluminate coupling agents and 0.2-0.24 parts of hexadecyl trimethoxy silicon are added Alkane is warming up to 100-110 DEG C, continues to stir 20min, after being cooled to room temperature, obtains mixture；Mixture is ground into 1-1.5h again Afterwards, 100-120 DEG C at a temperature of, dry 3-4h is cooled to room temperature to get modified aluminium hydroxide.

3. PVC Sheathing Compound pellet according to claim 1, it is characterised in that: the retardant synergist is parts by weight Than the nickel acetylacetonate, ammonium molybdate and chlorinated paraffin for 2:1:1.

4. PVC Sheathing Compound pellet according to claim 1, it is characterised in that: the plasticizer is that weight fraction ratio is The dioctyl terephthalate and diisooctyl phthalate of 1.5:1.

5. PVC Sheathing Compound pellet according to claim 1, it is characterised in that: the stabilizer is calcium zinc stabilizer.

6. PVC Sheathing Compound pellet according to claim 1, it is characterised in that: the filler is calcium carbonate and talcum One of powder or theirs is compound.

7. PVC Sheathing Compound pellet according to claim 1, it is characterised in that: the lubricant is that weight ratio is 3:1:1 Polyethylene wax, microwax, erucyl amide.

8. a kind of method for preparing the PVC Sheathing Compound pellet as described in claim 1-7 any one, it is characterised in that: packet Include following steps: