CN102746557B - Composition, anti-neutron plate prepared by using composition and preparation method of anti-neutron plate - Google Patents
Composition, anti-neutron plate prepared by using composition and preparation method of anti-neutron plate Download PDFInfo
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- CN102746557B CN102746557B CN201210258082.0A CN201210258082A CN102746557B CN 102746557 B CN102746557 B CN 102746557B CN 201210258082 A CN201210258082 A CN 201210258082A CN 102746557 B CN102746557 B CN 102746557B
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Abstract
The invention provides a composition, an anti-neutron plate prepared by using the composition and a preparation method of the anti-neutron plate. The composition comprises the following components by weight: 46.1-62.9 parts of boric acid, 27.8-48.5 parts of low density polyethylene, 5.4-9.3 parts of modifying agent, parts of carbon black, and 1 part of plasticizer, and the technical problems of non-resistance to high temperature of boric acid and not-strong ability to shield the neutron of the anti-neutron plate in the prior art are solved.
Description
Technical field
The present invention relates to NEUTRON PROTECTION plate field, especially, relate to a kind of composition for the preparation of anti-middle daughter board, in addition, the invention still further relates to a kind of anti-middle daughter board adopting above-mentioned composition to make and preparation method thereof.
Background technology
Neutron is the one in nuclear radiation, and penetration power is strong, has outer according to property damage to human body.In order to prevent neutron to the injury of human body, the polyethylene board of boracic is generally adopted to carry out shielding protection to neutron both at home and abroad.Because middle proton rest mass is 1.0086649u, and the rest mass of hydrogen atom is 1.007825u, the atomic mass of neutron is close with the atomic mass of hydrogen atom, therefore, when the hydrogen nuclei of fast neutron and shielding collides, the easiest by the transmission ofenergy of fast neutron to hydrogen atom expended energy, thus be thermal neutron and thermal neutron by Moderation of the fast neutrons.In shielding, hydrogen content is more, then slowing down effect is stronger, and the hydrogen atom contained in polyethylene is maximum, is the moderator of conventional fast neutron, reaches the effect slowing down nuclear reaction, is the material of good anti-middle daughter board.Boric acid is the good absorption agent of thermal neutron, and after fast neutron become thermal neutron and thermal neutron by slowing down, thermal neutron can not be absorbed, the object shielding hot fast neutron completely can not be reached, boron is large to the absorption cross section of thermal neutron, and does not produce high-energy gamma radiation, can absorb thermal neutron completely.The abundance of boron is 18.98% simultaneously, is easy to obtain.
In preparation is anti-daughter board process in produce a large amount of heats, and boric acid will dewater at 100 ~ 105 DEG C and becomes metaboric acid (HBO
2); And be heated into for a long time between 104 ~ 160 DEG C and can transfer tetraboric acid (H to
2b
4o
7), be also pyroboric acid; Continue to add 180 DEG C then can decompose, then continuation heating then becomes (B
2o
3) boron trioxide, and cause the performance of protecting neutron reduce or lose.
Summary of the invention
The object of the invention is to provide a kind of composition for the preparation of preventing middle daughter board, and the preparation method of daughter board in being prevented with this by its obtained anti-middle daughter board, to solve prior art mesoboric acid non-refractory, anti-middle daughter board shields the indifferent technical problem of neutron.
For achieving the above object, according to an aspect of the present invention, provide a kind of composition for the preparation of daughter board in anti-, comprise 46.1 ~ 62.9 part by weight of boric acid, 27.8 ~ 48.5 weight part Low Density Polyethylenes, 5.4 ~ 9.3 part by weight modified doses, 2 parts by weight of carbon black per, 1 parts by weight of plasticizer.
Further, the density of Low Density Polyethylene is 0.92, and melt index is 2 ~ 7g/10min; Properties-correcting agent is ethene ~ acetate ethylene copolymer; Softening agent is phthalic acid dibutyl ester.
Further, in ethene ~ vinyl acetate between to for plastic, the content of vinyl acetate between to for plastic is 14 ~ 16%, and melt index is 1.5 ~ 2.0g/10min.
Further, composition comprises 0.04 ~ 0.1 weight part lubricant, 0.04 ~ 1 weight part antioxidant further; Lubricant is amine hydroxybenzene; Antioxidant is 2,6 ~ ditertbutylparacresol.
Another aspect of the present invention additionally provides the anti-middle daughter board be prepared from by above-mentioned composition.
Another aspect of the present invention, additionally provide above-mentioned anti-in the preparation method of daughter board, comprise batching, mix, extrude just mould, broken, extrude to mould eventually, roll, compression molding step, it is characterized in that,
Adopt composition any one of claim 1 ~ 4 as material,
Extruding and just moulding feeding section temperature in step is 70 ~ 80 DEG C, and fluxing zone temperature is 80 ~ 100 DEG C, screw speed 20 ~ 25r/min.
Further, the rotating speed of mixing step is 20 ~ 30r/min, and mixing temperature is 50 ~ 60 DEG C.
Further, extruding and moulding feeding section temperature in step is eventually 70 ~ 80 DEG C, and fluxing zone temperature is 90 DEG C ~ 103 DEG C, screw speed 15 ~ 20r/min.
Further, be that heating medium pair roller barrel is heated to 140 ~ 150 DEG C with oil in calendaring processes, roller linear velocity is 8 ~ 10m/min, and embracing the roller time is 0.8 ~ 1.0min.
Further, compression molding step comprises precompressed, hot pressing, colds pressing the stage;
The temperature of pre-pressing stage is 99 ~ 108 DEG C, and pressure is 0.5mpa, and the time is 20min;
The temperature of hot press period is 151 ~ 158 DEG C, and pressure is 0.2mpa, and the time is 10min;
Cold pressing stage etch for carry out at normal temperatures, and pressure is 0.3mpa, and the time is 30min.
The present invention has following beneficial effect:
Composition provided by the invention, be easy to be processed into anti-middle daughter board, plasticizing effect is good, and its Boron contents reaches 8% ~ 11%, higher than prior art 3% ~ 6%, the veneer sheet shielding neutron ability be prepared from obviously is strengthened.
Anti-middle daughter board shield effectiveness provided by the invention is good, and toughness is strong, durable in use.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the process flow diagram of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The invention provides a kind of composition for the preparation of daughter board in anti-, comprise 46.1 ~ 62.9 part by weight of boric acid, 27.8 ~ 48.5 weight part Low Density Polyethylenes, 5.4 ~ 9.3 part by weight modified doses, 2 parts by weight of carbon black per, 1 parts by weight of plasticizer.
Containing higher hydrogen atom in polyethylene (PE), the carrying out of nuclear reaction can be slowed down, play the effect of slowing down fast neutron.PE material is divided into Low Density Polyethylene (LDPE) according to the size of density, LLDPE (LLDPE), medium-density polyethylene (MDPE), high density polyethylene(HDPE) (HDPE), full density polythene, ultrahigh molecular weight polyethylene(UHMWPE) and metallocene PE (MPE); Current industrial frequent use have LDPE, LLDPE and HDPE.The density of PE is determined by the molecular chain of PE and degree of crystallinity.The density of LDPE is 0.91 ~ 0.925, its molecular chain has length side chain, and form is soft, and degree of crystallinity is 60 ~ 70%, and crystalline melt point is 105 ~ 108 DEG C, therefore processing temperature is also low.The density of LLDPE is density 0.91 ~ 0.925, but the molecular chain of LLDPE only has short-chain branch, and degree of crystallinity is 25 ~ 75%, and processing temperature is higher than LDPE 40 DEG C.The density of HDPE be 0.941 ~ 0.959, HDPE molecular chain on short-chain branch little, do not have long-chain branch, degree of crystallinity is 75 ~ 85 DEG C, and crystalline melt point is 126 ~ 130 DEG C.Because anti-middle daughter board mesoboric acid at high temperature easily decomposes, the present invention selects LDPE as the material of anti-middle daughter board, and the crystalline melt point of LDPE is low, and processing temperature is lower, meets anti-middle daughter board processing request.
Boric acid can absorb thermal neutron, plays the effect of shielding neutron.The present invention selects the boric acid of 46.1 ~ 62.9 weight parts to add in the composition of anti-middle daughter board, makes Boron contents in the composition of anti-middle daughter board reach 8% ~ 11%, can ensure the screening ability of daughter board in preventing; Boron contents is higher, stronger to the adsorptive power of neutron.If Boron contents is too low, then the anti-middle daughter board screening ability prepared is not strong; If Boron contents is too high, then anti-middle daughter board is difficult to processing.
During properties-correcting agent can prevent, daughter board cracking, increases toughness and impact property.Carbon black has shielding and absorbs ultraviolet function, can prevent LDPE under action of ultraviolet radiation, chain occurring disconnected and aging.Softening agent can reduce PE plasticization temperature, promotes LDPE low-temperature plasticizing.
The present invention by 46.1 ~ 62.9 part by weight of boric acid, 27.8 ~ 48.5 weight part LDPE, 5.4 ~ 9.3 part by weight modified doses, 2 parts by weight of carbon black per, 1 parts by weight of plasticizer be mixed with anti-in daughter board, processing temperature is low, can prevent boric acid from decomposing, shields neutron ability stronger; Enhance toughness, the impact capacity of anti-middle daughter board simultaneously, rugged environment more can be adapted to.If boric acid content adds too much, then have impact on adding of the composition such as LDPE, properties-correcting agent, if boric acid content adds very few, then Boron contents is low, not good to the shield effectiveness of neutron; If the content of LDPE is too much, the content of boric acid is lower, if the content of LDPE is too low, then anti-middle daughter board is difficult to processing.
LDPE is divided into different grades by melt flow rate (MFR) (M1) again, and MI characterizes the molecular weight of polymkeric substance, and the larger then intensity of molecular weight is higher, but processing temperature is higher; Molecular weight is little, and processing temperature is low, good fluidity.Due to boric acid (H
3bO
3) need to process under euthermic condition, the present invention preferably selects density to be 0.92, MI to be the LDPE of 2 ~ 7g/10min, and vicat softening temperature is between 85 DEG C ~ 95 DEG C.
The present invention selects ethylene-vinyl acetate copolymer (EVA) to be properties-correcting agent, EVA is a kind of elasticity transparent copolymer, when the content of the vinyl acetate between to for plastic (VA) in EVA is between 14 ~ 16%, when melt index MI is 1.5 ~ 2.0g/10min, daughter board stress cracking in preventing, plays the effect strengthening anti-middle daughter board toughness.Simultaneously EVA and LDPE has very large consistency, can arbitrary proportion blended, processing temperature is low, be applicable to be processed into anti-in daughter board.
The present invention selects phthalic acid dibutyl ester (DBP) to be softening agent, and DBP is a kind of oily liquids, and add in LDPE mixture and carbon black can be adhered to raw material surface, avoid dust from flying, also have intermiscibility to LDPE, plasticizing effect is good.
Described composition further comprises 0.04 ~ 0.1 weight part lubricant, 0.04 ~ 1 weight part antioxidant; Described lubricant is amine hydroxybenzene; Described antioxidant is 2,6 ~ ditertbutylparacresol.Because LDPE is oxidizable in processing and use procedure, makes molecular rupture, affect work-ing life, oxidation inhibitor should be added and stoped.Because LDPE processing temperature is low, the present invention selects the 2.6 ~ ditertbutylparacresol (BHT) of 0.04 ~ 1.0 weight part as antioxidant, and antioxidant property is strong, can meet the processing request of anti-middle daughter board.LDPE easy roll banding in the process of rolling out film simultaneously, causes anti-middle daughter board rough, in order to make LDPE rolling out film process sticky mixed, need to add lubricant, the present invention adds 0.04 ~ 0.1 weight part oleic acid acyl ammonium as lubricant, and material is easily processed in flakes, and quality is good.
Another aspect of the present invention additionally provides the anti-middle daughter board be prepared from by above-mentioned composition.This veneer sheet can be prepared according to a conventional method.
Another aspect of the present invention additionally provide above-mentioned anti-in the preparation method of daughter board, comprise batching, mix, extrude just mould, broken, extrude to mould eventually, roll, compression molding.Adopt by 46.1 ~ 62.9 part by weight of boric acid, 27.8 ~ 48.5 weight part LDPE, 5.4 ~ 9.3 part by weight modified doses, 2 parts by weight of carbon black per, 1 parts by weight of plasticizer, 0.04 ~ 0.1 weight part lubricant, 0.04 ~ 1 weight part antioxidant combination composition anti-as preparation in the material of daughter board.
Mixing step, for material is placed in spiral ribbon mixer, carries out mixing 20min under rotating speed is 20 ~ 30r/min, and material is by temperature arrising caused by friction to 50 ~ 60 DEG C.Then carry out extruding and just mould step.As too high in mixed rotating speed, mixing time is long, then temperature of charge is too high, causes boric acid to decompose, and impact shielding neutron ability, if mixing rotating speed is too low, mixing time is too short, then mixing of materials is uneven, affects sheet material plasticizing and compacting.
Extruding and just moulding step is mixed material is carried out in Planetary Screw Extruder just plasticizing process to obtain lumpy material, and the feeding section temperature of Planetary Screw Extruder is 70 ~ 80 DEG C, and fluxing zone temperature is 80 ~ 100 DEG C, and screw speed is 20 ~ 25r/min.Planetary Screw Extruder is made up of feeding section and fluxing zone, and feeding section plays mass transport effect, and feeding section temperature is set to 70 ~ 80 DEG C, makes material first carry out preheating, for material plasticizing is ready.The driving screw of fluxing zone and machine tube inner wall all machined multi-head spiral tooth, the small screw of different quantities is dispersed with around driving screw, small screw also machined multi-head spiral tooth, driving screw and small screw and machine barrel engage completely, top clearance of tooth only has 0.2 ~ 0.4mm, when driving screw rotates, small screw can rotation, and revolves round the sun round driving screw.Screw speed can regulate, and when adjusting screw(rod) rotating speed is 20 ~ 25r/min, material carries out mixing refining by spiral wheel and moulds, and ensures that mixing of materials is even; When rotating speed is too high, easily cause storeroom temperature arrising caused by friction, cause boric acid to decompose, the shield effectiveness of daughter board during impact is anti-.The driving screw of Planetary Screw Extruder and machine barrel are by heated oil heat supply, fuel tank cold water temperature adjustment, temperature precise control, when regulating plasticization temperature to be 80 ~ 100 DEG C, can prevent that temperature of charge is too low causes plasticizing not exclusively, or the too high boric acid that causes of temperature of charge decomposes, the shield effectiveness of daughter board during impact is anti-.After material enters fluxing zone, be subject to mixing, roll, shear and plastication, constantly push material to outlet and obtain lumpy material, first plastic phase completes.
Destruction step, for lumpy material is cooled to room temperature, then carries out destruction step and obtains 3 ~ 5mm particle.Lumpy material after just plasticizing is pulverized, material is dropped in Planetary Screw Extruder again and plastifies further.
Extrude and eventually mould step and obtain plastifying material for particle is carried out final curing step in planetary extruder.Planetary extruder feeding section temperature is 70 ~ 80 DEG C, and fluxing zone temperature is 90 DEG C ~ 103 DEG C, can ensure that material plasticizing is complete.When screw speed is 15 ~ 20r/min, can ensure that particle mixes fully in Planetary Screw Extruder, plasticizing effect is good.
Calendaring processes carries out obtaining the sheet material that thickness is 0.6 ~ 0.8mm in five roll calendars.Be that medium heats the carrying out of rolling press with oil, when roller temperature is 140 ~ 150 DEG C, adjusting roller linear velocity is 8 ~ 10m/min, then plastifying material is added, in five roll calendars, embrace roller 0.8 ~ 1.0min, make plastifying material melting slice, then enter cooling roller cooling.Oil is heating medium, and speed is adjustable, temperature-controllable.Although the processing temperature of calendaring processes is high, the time is very short, less on the impact of boric acid.Adopt five roll calendars to carry out rolling out film, roller temperature is 140 ~ 150 DEG C, and Roller conveyor speed is 8 ~ 10m/min, embracing the roller time is 0.8 ~ 1.0min, and ensure that sheet material compacting is all right, sheet surface is smooth, if Roller conveyor speed is too low, be then not easy roll banding in calender line, be difficult to processing; If roller temperature is too high, embrace roller overlong time, the then easy decomposes of sheet material mesoboric acid, the shield effectiveness of daughter board during impact is anti-.
Compression molding step comprises precompressed, hot pressing, colds pressing the stage.Sheet material is put in a mold, after being steam heated to 99 ~ 108 DEG C, precompressed 20min under the pressure of 0.5mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 10min under 0.2mpa pressure; Then bleed off steam, pass into water coolant and cool the sheet material after hot pressing in hot-plate, the 30min that then colds pressing under 0.3mpa pressure obtains anti-middle daughter board.Adopt press to carry out molding process to sheet material, can prevent sheet material from sliding, affect pressing result.Pressing plate in compression molding step adopts steam heating, and temperature is adjustable, prevents the too high sheet material that causes of sheet temperature from shielding neutron poor effect; Or sheet temperature is too low, causes compression molding step insufficient, affect sheet quality.
Embodiment
Material used in following examples and instrument are commercially available.
Embodiment 1 ~ 4
By the composition that LDPE, boric acid, EVA, carbon black, DBP fill a prescription according to embodiment 1 ~ 4 and comparative example 1 ~ 4,
open plastics processing mill; Roller temperature is carry out calendaring processes at 150 DEG C, and the roll-in time is that 5min obtains the thick sheet material of 2mm, detects the ability of sheet material plasticizing situation and shielding neutron.
Different types of carbon black composition all used in the present invention.
Table 1 is embodiment 1 ~ 4 and each group component of comparative example 1 ~ 4 and its processing characteristics test-results, and symbol A represents that sheet material is easily processed, and easily embraces roller, can be in blocks, and plasticizing is good, smooth surface; Symbol B shows and can process reluctantly, can embrace roller, can be in blocks, rough; Symbol C represents and is difficult to process, and difficult armful roller is in flakes difficult, rough, difficulty plasticizing.
The each group component of table 1 embodiment 1 ~ 3 and processing characteristics test-results table
From the test-results of table 1, the composition of embodiment 1 ~ 4 is easily processed, sheet quality is good, shielding neutron ability is strong, the composition of comparative example 1 ~ 4 is then difficult to be processed into sheet material, sheet quality is poor, shielding neutron ability is weak, prove when boric acid add-on is at 46.1 ~ 62.9 weight parts, the add-on of LDPE is 27.8 ~ 48.6 weight parts, EVA add-on is 5.4 ~ 9.3 weight parts, carbon black add-on is 2 weight parts, DBP add-on is 1 weight part, amine hydroxybenzene add-on is 0.04 weight part, when BHT add-on is 0.08 weight part, in anti-, sub-pieces is easily processed, slice is all right, plastify all right, smooth surface, if add the component such as boric acid, LDPE, EVA not in accordance with above-mentioned add-on, then sheet material is difficult to processing, and shielding neutron is indifferent, and sheet quality is bad, if do not add carbon black, then sheet material is easily aging under ultraviolet light, if do not add DBP, then sheet material is difficult to plasticizing, if do not add amine hydroxybenzene, then sheet material easy roll banding in the course of processing, if do not add BHT, then sheet material is oxidizable.The quality condition of embodiment 3 is optimum, is preferred embodiment.
Embodiment 5
Choose the anti-middle daughter board of composition preparation of embodiment 3.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 20r/min, material has mixed after leaning on material temperature arrising caused by friction to 50 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 70 DEG C, material is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 80 DEG C, be that 20r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 3mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 70 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 90 DEG C DEG C, carry out extruding under screw speed is 15r/min moulding eventually and obtain plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 140 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 8m/min carries out melting slice 0.8min cooling roller cooling obtain the sheet material that thickness is 0.6mm.
6, sheet material is put in a mold, after being steam heated to 99 DEG C, by sheet material precompressed 20min under the pressure of 0.5mpa; Then by the sheet material after precompressed by after being steam heated to 151 DEG C, hot pressing 10min under 0.1mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.1mpa pressure 30min obtain thickness be 20mm anti-in daughter board.
Embodiment 6
Choose the anti-middle daughter board of composition preparation of embodiment 3.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 25r/min, material has mixed after leaning on material temperature arrising caused by friction to 55 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 75 DEG C, material is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 90 DEG C, be that 23r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 4mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 75 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 98 DEG C, under screw speed is 17r/min, carries out extruding whole moulding obtains plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 145 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 9m/min carries out melting slice 0.9min cooling roller cooling obtain the sheet material that thickness is 0.7mm.
6, compression molding: put by sheet material in a mold, after being steam heated to 105 DEG C, by sheet material precompressed 20min under the pressure of 0.5mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 10min under 0.2mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.3mpa pressure 30min obtain thickness be 20mm anti-in daughter board.
Embodiment 7
Choose the anti-middle daughter board of composition preparation of embodiment 3.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 30r/min, material has mixed after leaning on material temperature arrising caused by friction to 60 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 80 DEG C, material is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 100 DEG C, be that 25r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 5mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 80 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 103 DEG C, under screw speed is 20r/min, carries out extruding whole moulding obtains plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 150 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 10m/min carries out melting slice 1.0min cooling roller cooling obtain the sheet material that thickness is 0.8mm.
6, sheet material is put in a mold, after being steam heated to 108 DEG C, by sheet material precompressed 20min under the pressure of 0.5mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 10min under 0.3mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.5mpa pressure 30min obtain thickness be 20mm anti-in daughter board.
Embodiment 8
Choose the anti-middle daughter board of composition preparation of embodiment 3.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 25r/min, material has mixed after leaning on material temperature arrising caused by friction to 55 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 75 DEG C, material is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 90 DEG C, be that 23r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 4mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 75 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 100 DEG C, under screw speed is 17r/min, carries out extruding whole moulding obtains plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 145 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 9m/min carries out melting slice 0.9min cooling roller cooling obtain the sheet material that thickness is 0.7mm.
6, compression molding: put by sheet material in a mold, after being steam heated to 100 DEG C, by sheet material precompressed 40min under the pressure of 0.4mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 20min under 0.2mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.3mpa pressure 50min obtain thickness be 40mm anti-in daughter board.
Embodiment 9
Choose the anti-middle daughter board of composition preparation of embodiment 1.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 25r/min, material has mixed after leaning on material temperature arrising caused by friction to 55 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 75 DEG C, material is sent to the fluxing zone of Planetary Screw Extruder, fluxing zone material is warming up to 90 DEG C, is that 23r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 4mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 75 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 100 DEG C, under screw speed is 17r/min, carries out extruding whole moulding obtains plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 145 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 9m/min carries out melting slice 0.9min cooling roller cooling obtain the sheet material that thickness is 0.7mm.
6, compression molding: put by sheet material in a mold, after being steam heated to 100 DEG C, by sheet material precompressed 40min under the pressure of 0.4mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 20min under 0.2mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.3mpa pressure 50min obtain thickness be 40mm anti-in daughter board.
Embodiment 10
Choose the anti-middle daughter board of composition preparation of embodiment 2.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 25r/min, material has mixed after leaning on material temperature arrising caused by friction to 55 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 75 DEG C, temperature is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 90 DEG C, be that 23r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 4mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 75 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 100 DEG C, under screw speed is 17r/min, carries out extruding whole moulding obtains plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 145 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 9m/min carries out melting slice 0.9min cooling roller cooling obtain the sheet material that thickness is 0.7mm.
6, compression molding: put by sheet material in a mold, after being steam heated to 100 DEG C, by sheet material precompressed 40min under the pressure of 0.4mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 20min under 0.2mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.3mpa pressure 50min obtain thickness be 40mm anti-in daughter board.
Embodiment 11
Choose the anti-middle daughter board of composition preparation of embodiment 4.
1, mix: formula material is placed in ribbon mixer and is uniformly mixed 20min, adjustment rotating speed is 25r/min, material has mixed after leaning on material temperature arrising caused by friction to 55 each other DEG C.
2, first moulding is extruded: the feeding section material mixed being put into Planetary Screw Extruder, by after feeding section temperature to 75 DEG C, material is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 90 DEG C, be that 23r/min carries out extruding just moulding and obtains lumpy material at screw speed.
3, pulverize: after block being cooled to room temperature, be broken into 4mm particle.
4, extrusion plasticizing: feeding section particle being put into Planetary Screw Extruder, after making feeding section temperature to 75 DEG C, particle is sent to the fluxing zone of Planetary Screw Extruder, by fluxing zone temperature to 100 DEG C, under screw speed is 17r/min, carries out extruding whole moulding obtains plastifying material.
5, roll: be that the roller of medium to five roll calendars is heated to 145 DEG C with oil, by plastifying material roller linear velocity be namely enter immediately after 9m/min carries out melting slice 0.9min cooling roller cooling obtain the sheet material that thickness is 0.7mm.
6, compression molding: put by sheet material in a mold, after being steam heated to 100 DEG C, by sheet material precompressed 40min under the pressure of 0.4mpa; Then by the sheet material after precompressed by after being steam heated to 155 DEG C, hot pressing 20min under 0.2mpa pressure; Then bleed off steam, in hot-plate, pass into water coolant the sheet material after hot pressing is cooled, sheet material cold pressing under 0.3mpa pressure 50min obtain thickness be 40mm anti-in daughter board.
The anti-Neutron properties of embodiment 5 ~ 11 detects
Detect according to the radiation-screening performance of GB/T14055.1 ~ 2008 standard to the anti-middle daughter board of embodiment 5 ~ 8.Detected result is listed in table 2.Test environment: temperature 18 DEG C, relative humidity 35%.
The anti-Neutron properties test result of table 2
From the test-results of table 2, the anti-middle daughter board adopting the preparation method of embodiment 5 ~ 11 to be prepared from, anti-Neutron properties is good, proves that the preparation method of embodiment 5 ~ 11 can prevent boric acid from decomposing, the shielding properties of daughter board during guarantee is anti-.The shielding properties of embodiment 8 is best, and prove that the thickness of anti-middle daughter board is larger, then the shielding properties of anti-middle daughter board is higher.In the anti-middle daughter board that preparation 20mm is thick, the anti-middle daughter board shielding properties of embodiment 6 is best, is most preferred embodiment of the present invention.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the composition for the preparation of anti-middle daughter board, it is characterized in that, comprise 46.1 ~ 62.9 part by weight of boric acid, 27.8 ~ 48.5 weight part Low Density Polyethylenes, 5.4 ~ 9.3 part by weight modified doses, 2 parts by weight of carbon black per, 1 parts by weight of plasticizer, wherein, described properties-correcting agent is ethene ~ acetate ethylene copolymer, and in described ethene ~ acetate ethylene copolymer, the content of vinyl acetate between to for plastic is 14 ~ 16%, and melt index is 1.5 ~ 2.0g/min.
2. composition according to claim 1, is characterized in that, the density of described Low Density Polyethylene is 0.92g/cm
3, melt index is 2 ~ 7g/min; Described softening agent is dibutyl phthalate.
3. composition according to claim 1, is characterized in that, described composition further comprises 0.04 ~ 0.1 weight part lubricant, 0.04 ~ 1 weight part antioxidant; Described lubricant is amine hydroxybenzene; Described antioxidant is 2,6 ~ ditertbutylparacresol.
4. the anti-middle daughter board be prepared from by composition described in any one of claims 1 to 3.
5. a preparation method for daughter board in anti-, comprise batching, mix, extrude just mould, broken, extrude to mould eventually, roll, compression molding step, it is characterized in that,
Adopt composition according to any one of claims 1 to 3 as material,
Describedly extrude that just to mould feeding section temperature in step be 70 ~ 80 DEG C, fluxing zone temperature is 80 ~ 100 DEG C, screw speed 20 ~ 25r/min.
6. preparation method according to claim 5, is characterized in that, the rotating speed of described mixing step is 20 ~ 30r/min, and mixing temperature is 50 ~ 60 DEG C.
7. preparation method according to claim 5, is characterized in that, described in extrude that eventually to mould feeding section temperature in step be 70 ~ 80 DEG C, fluxing zone temperature is 90 DEG C ~ 103 DEG C, screw speed 15 ~ 20r/min.
8. preparation method according to claim 5, is characterized in that, be that heating medium pair roller is heated to 140 ~ 150 DEG C with oil in described calendaring processes, roller linear velocity is 8 ~ 10m/min, and embracing the roller time is 0.8 ~ 1.0min.
9. preparation method according to claim 5, is characterized in that, described compression molding step comprises precompressed, hot pressing, colds pressing the stage;
The temperature of described pre-pressing stage is 99 ~ 108 DEG C, and pressure is 0.5Mpa, and the time is 20min;
The temperature of described hot press period is 151 ~ 158 DEG C, and pressure is 0.2MPa, and the time is 10min;
Described stage etch of colding pressing is for carry out at normal temperatures, and pressure is 0.3MPa, and the time is 30min.
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| CN110774512A (en) * | 2019-10-10 | 2020-02-11 | 中广核研究院有限公司 | Forming method of tungsten boron crosslinked polyethylene composite shield with high tungsten content |
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