CN1763128A - Machining method of lead boron polyethylene shielding material block - Google Patents
Machining method of lead boron polyethylene shielding material block Download PDFInfo
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- CN1763128A CN1763128A CN 200410086481 CN200410086481A CN1763128A CN 1763128 A CN1763128 A CN 1763128A CN 200410086481 CN200410086481 CN 200410086481 CN 200410086481 A CN200410086481 A CN 200410086481A CN 1763128 A CN1763128 A CN 1763128A
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- lead
- material block
- shielding material
- boron
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Abstract
The present invention relates to the extruding and pressing process of radiation shielding material block, and is the shielding lead-boron-polyethylene material block processing method. The technological process includes mixing material, pelletizing, expressing and pressing, and fine treatment. The present invention has the obvious effects of shortened technological process, raised production efficiency, raised shielding performance of the product, high material utilization rate and lowered production cost.
Description
Technical field:
The invention belongs to a kind of complete processing of matrix material, what be specifically related to a kind of radioactive shielding material piece extrudes press process technology.
Background technology:
Lead boron polyethylene shielding material block is mainly used in the shielding of neutron and gamma-rays combined radiation field.Chinese patent application number is respectively 02153838.7,02153839.5 and 02153840, and the working method that title is respectively " lead-boron polythene sheet metal forming technology ", " mixing procedure of lead-boron polythene " and " laminating technology of lead-boron polythene plate " disclosed lead boron polyethylene shielding material block is batch mixing → granulation → plate squeezing → lamination → assembling and roughing → precision work → product.Its shortcoming is: (1) this technical process is long, production efficiency is lower; (2) the inner generation of product pore probability is higher, and the crack of processing generation all can influence the shielding properties of product in addition; (3) in assembling and roughing process, easily produce reclaimed materials and waste material, make utilization ratio of raw materials lower, so production cost is higher.
Summary of the invention:
The purpose of this invention is to provide a kind of production efficiency height, with low cost, and the working method of the lead boron polyethylene shielding material block of product advantages of good shielding performance.
For achieving the above object; the present invention is achieved in that a kind of working method of lead boron polyethylene shielding material block; it comprise with lead powder, boron carbide powder and polyethylene pellet in required ratio weighing after; even in high-speed mixer and mixing; through the tablets press granulation; generate and mix pellet, simultaneously, it also comprises:
The mixing pellet that (1) will generate sucks the hopper of forcing machine through automatic charging machine, clamp-ons after the high temperature plasticizing in the forming mould that vacuum tightness is higher than 60Pa;
(2) be 120 ℃ ~ 160 ℃ to the plasticizing material in the mould in initial temperature with pressurizing device, pressure is 30 ~ 120kg/cm
2Suppress under the condition, when temperature is 30 ℃ ~ 50 ℃, make it naturally cool to room temperature,, generate lead boron polyethylene shielding material block through precision work with the forming blocks demoulding.
Said lead powder content accounts for 70 ~ 85% of gross weight, and the content of boron carbide powder accounts for 1 ~ 5% of gross weight, and poly content accounts for 19 ~ 25% of gross weight.
Compared with prior art, unusual effect of the present invention is: (1) has shortened technical process, only is batch mixing → granulation → extrude compacting → precision work, carries out disposable production from pellet to the lead-boron polythene piece, significantly reduced the production time, production efficiency is greatly improved; (2) mould inside vacuumizes, and the probability of the inner pore that produces of lead-boron polythene piece has been reduced, and the product that adds generation is a disposable product, the crack that no post-treatment produced, and these have all improved the shielding properties of product greatly; (3) owing to merged plate squeezing, lamination and three processing steps of roughing, shortened technical process, the salvage material ratio is reduced greatly, improved utilization ratio of raw materials, saved production cost for extruding pressing process.
Embodiment
Embodiment 1
(1) take by weighing lead powder, 5% boron carbide powder, 25% polyethylene pellet that content accounts for gross weight 70%, even in high-speed mixer and mixing, through the tablets press granulation;
(2) pellet sucks the forcing machine hopper through automatic charging machine, after the high temperature plasticizing, clamp-ons in the forming mould that vacuum tightness is higher than 60Pa;
(3) be 120 ℃ to the plasticizing material in the mould in starting temperature with pressurizing device, pressure is 30 ~ 120kg/cm
2Under suppress, the compacting end temp be 30 ℃, naturally cool to room temperature then, after the molding mass demoulding, make lead boron polyethylene shielding material block through precision work.
Embodiment 2
(1) take by weighing lead powder, 1% boron carbide powder, 19% polyethylene pellet that content accounts for gross weight 80%, even in high-speed mixer and mixing, through the tablets press granulation;
(2) with embodiment 1;
(3) be 140 ℃ to the plasticizing material in the mould in starting temperature with pressurizing device, pressure is 30 ~ 120kg/cm
2Under suppress, the compacting end temp be 40 ℃, naturally cool to room temperature then, after the demoulding, make lead boron polyethylene shielding material block through precision work.
Embodiment 3
(1) take by weighing lead powder, 3% boron carbide powder, 22% polyethylene pellet that content accounts for gross weight 85%, even in high-speed mixer and mixing, through the tablets press granulation;
(2) with embodiment 1;
(3) be 160 ℃ to the plasticizing material in the mould in starting temperature with pressurizing device, pressure is 30 ~ 120kg/cm
2Under suppress, the compacting end temp be 50 ℃, naturally cool to room temperature then, after the demoulding, make lead boron polyethylene shielding material block through precision work.
In the process of above-mentioned three embodiment compression mouldings, it is littler to exert pressure when normally temperature is higher, near 30kg/cm
2, after temperature descended gradually, institute exerted pressure and will increase gradually, more and more near 120kg/cm
2, be 30 ℃ ~ 50 ℃ compactings when finishing to temperature, then do not exerted pressure.Mould therefor is a rectangular structure, and there is " Z " font deep fat passage die wall inside, can make the mould insulation at 100 ℃ ~ 160 ℃, and vacuum extractor can make mould inside keep black vacuum, and wrap up with sealing material the outside.
Claims (2)
1. the working method of a lead boron polyethylene shielding material block, it comprise with lead powder, boron carbide powder and polyethylene pellet in required ratio weighing after, even in high-speed mixer and mixing, through the tablets press granulation, generate and mix pellet, it is characterized in that: it also comprises:
The mixing pellet that (1) will generate sucks the hopper of forcing machine through automatic charging machine, clamp-ons after the high temperature plasticizing in the forming mould that vacuum tightness is higher than 60Pa;
(2) be 120 ℃ ~ 160 ℃ to the plasticizing material in the mould in initial temperature with pressurizing device, pressure is 30 ~ 120kg/cm
2Suppress under the condition, when temperature is 30 ℃ ~ 50 ℃, make it naturally cool to room temperature,, generate lead boron polyethylene shielding material block through precision work with the forming blocks demoulding.
2. according to the working method of the said a kind of lead boron polyethylene shielding material block of claim 1, it is characterized in that: said lead powder content accounts for 70 ~ 85% of gross weight, the content of boron carbide powder accounts for 1 ~ 5% of gross weight, and poly content accounts for 19 ~ 25% of gross weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100864819A CN1323109C (en) | 2004-10-21 | 2004-10-21 | Machining method of lead boron polyethylene shielding material block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100864819A CN1323109C (en) | 2004-10-21 | 2004-10-21 | Machining method of lead boron polyethylene shielding material block |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1763128A true CN1763128A (en) | 2006-04-26 |
| CN1323109C CN1323109C (en) | 2007-06-27 |
Family
ID=36747459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100864819A Active CN1323109C (en) | 2004-10-21 | 2004-10-21 | Machining method of lead boron polyethylene shielding material block |
Country Status (1)
| Country | Link |
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| CN (1) | CN1323109C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362050C (en) * | 2005-10-21 | 2008-01-16 | 北京市射线应用研究中心 | Composite shielding materials with lead boron polythene material and preparation thereof |
| CN104292609A (en) * | 2013-07-15 | 2015-01-21 | 中国核动力研究设计院 | Heat-resistant composite shielding material and preparation method thereof |
| CN104610638A (en) * | 2015-01-19 | 2015-05-13 | 中国船舶重工集团公司第七一九研究所 | Machining method of lead-boron polyethylene plate |
| CN111732775A (en) * | 2020-07-02 | 2020-10-02 | 北京科技大学 | Polymer composite material for space neutron shielding and preparation method thereof |
| CN112961423A (en) * | 2021-02-23 | 2021-06-15 | 中国核动力研究设计院 | Lead-boron polyethylene plate and size control method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1236905C (en) * | 2002-12-05 | 2006-01-18 | 中国核动力研究设计院 | Moulding technology for lead-boron polyethylene sheet |
| CN1222571C (en) * | 2002-12-05 | 2005-10-12 | 中国核动力研究设计院 | Mixing technology for lead, boron and polyethylene |
-
2004
- 2004-10-21 CN CNB2004100864819A patent/CN1323109C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362050C (en) * | 2005-10-21 | 2008-01-16 | 北京市射线应用研究中心 | Composite shielding materials with lead boron polythene material and preparation thereof |
| CN104292609A (en) * | 2013-07-15 | 2015-01-21 | 中国核动力研究设计院 | Heat-resistant composite shielding material and preparation method thereof |
| CN104610638A (en) * | 2015-01-19 | 2015-05-13 | 中国船舶重工集团公司第七一九研究所 | Machining method of lead-boron polyethylene plate |
| CN111732775A (en) * | 2020-07-02 | 2020-10-02 | 北京科技大学 | Polymer composite material for space neutron shielding and preparation method thereof |
| CN112961423A (en) * | 2021-02-23 | 2021-06-15 | 中国核动力研究设计院 | Lead-boron polyethylene plate and size control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1323109C (en) | 2007-06-27 |
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Application publication date: 20060426 Assignee: Hailong Emerson (Zhenjiang) Energy Technology Co., Ltd. Assignor: Nuclear Power Institute of China Contract record no.: 2010320000210 Denomination of invention: Machining method of lead boron polyethylene shielding material block Granted publication date: 20070627 License type: Exclusive License Record date: 20100312 |