CN102690462A - Moulding material for tool marks - Google Patents
Moulding material for tool marks Download PDFInfo
- Publication number
- CN102690462A CN102690462A CN2012101721357A CN201210172135A CN102690462A CN 102690462 A CN102690462 A CN 102690462A CN 2012101721357 A CN2012101721357 A CN 2012101721357A CN 201210172135 A CN201210172135 A CN 201210172135A CN 102690462 A CN102690462 A CN 102690462A
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- CN
- China
- Prior art keywords
- tool mark
- paraffin
- mark pattern
- making material
- vinyl acetate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to moulding material for tool marks, which comprises the following components: 42.5 to 55.8 wt percent of ethylene- vinyl acetate ester copolymer, 15.2 to 21.8 wt percent of paraffin, 2.3 to 4.8 wt percent of modified rosin, 12.5 to 17.5 wt percent of simethicone, 2.7 to 8.5 wt percent of silica, and 4.8 to 7.2 wt percent of hard acid. The moulding material for tool marks, provided by the invention, can not only be used for extracting surface shallow marks, but also be used for extracting deep and solid marks. The moulding material for tool marks, provided by the invention, is mainly used for moulding tool marks on a crime scene.
Description
Technical field
The present invention relates to a kind of pattern-making material, more particularly, the present invention relates to a kind of material that is used for polynary tool mark molding.
Background technology
Tool mark is meant the offender in the process of crime, the vestige that tool using stays in the contact site when destroying object.Tool mark occurrence rate on criminal case crime scene is higher, and according to incompletely statistics, the tool mark occurrence rate accounts for more than 70% of criminal scene.Tool mark is modal a kind of vestige in the site inspection; And it is not easy to be destroyed or to pretend; Occurrence rate is high, and characteristic is stable, generally has appraisal value preferably; Thereby this vestige is the same at other vestiges of criminal investigation neutralization (impression of the hand, footprint), is disclosing and is fighting crime, gives a clue, confirms to investigate for detection work and have important effect aspect the direction.
Extraction for tool mark has three kinds of main process for extracting such as the original of extraction method, camera method and molding method usually.Wherein molding method is the main method of on-the-spot tool mark extraction and application.Yet materials such as traditional duroplasts, Zylox only are applicable to that some show shallow vestige, for darker vestige of abnormity and the tool mark on the rough object, and process for extracting preferably never both at home and abroad., because not possessing good mobility and ductility and HS, never well extracted pattern-making material for darker special-shaped vestige.
The vestige that abnormity is darker and the extraction difficult point of the tool mark on the rough object are flowability and toughness, and the pattern-making material of good fluidity is paraffin for example, though can cover any less and dark slit, its toughness and intensity are all relatively poor, are prone to pulverize.Though EVA has viscosity and toughness preferably, it is mobile poor, glues into one after the heating, has got into not the slit.We show paraffin and EVA material mixing in the research in early stage, when the content of EVA greater than 50% the time, the viscosity increasing.When the ratio of paraffin good fluidity greater than 50% time, model toughness descends and is frangible.The ratio through each component in simple adjustment paraffin and the EVA mixtures of material of experiment showed, can't obtain can the fine pattern-making material.
Summary of the invention
In order to solve the above-mentioned technical problem that exists in the prior art, the object of the present invention is to provide a kind of tool mark pattern-making material.Described tool mark pattern-making material can extract the crime scene preferably and be destroyed the various tool vestige on the object.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of tool mark pattern-making material is characterized in that composed of the following components: ethylene-vinyl acetate copolymer: 42.5-55.8wt%, paraffin: 15.2-21.8wt%, modified rosin: 2.3-4.8wt%, dimethyl silicone oil: 12.5-17.5wt%, silicon-dioxide: 2.7wt%-8.5wt%, stearic acid: 4.8-7.2wt%.
As preferably, said tool mark pattern-making material is composed of the following components: ethylene-vinyl acetate copolymer: 47.5-52.5wt%, paraffin: 17.5-20.5wt%, modified rosin: 2.5-4.0wt%, dimethyl silicone oil: 15.0-16.5wt%, silicon-dioxide: 3.5wt%-6.5wt%, stearic acid: 5.0-6.5wt%.
As preferably, the mass ratio of said ethylene-vinyl acetate copolymer and paraffin is 2.3-2.7.
As preferably, the mass ratio of said ethylene-vinyl acetate copolymer and paraffin is 2.52.
As preferably, said tool mark pattern-making material is composed of the following components: ethylene-vinyl acetate copolymer: 48.5wt%, paraffin: 20.5wt%, modified rosin: 3.2wt%, dimethyl silicone oil: 15.8wt%, silicon-dioxide: 6.2wt%, stearic acid: 5.8wt%.
As preferably, said modified rosin is staybelite, nilox resin, polymerized rosin or acrylic acid modified rosin.
As preferably, straight-chain paraffin is 90-95wt% in the said paraffin.
Second aspect of the present invention relates to a kind of club-shaped material, and it prepares through above-mentioned tool mark pattern-making material of the present invention.
Described ethylene-vinyl acetate copolymer, English name are ethylene-vinyl acetate copolymer (below be abbreviated as EVA), and molecular formula is (C
2H
4) x. (C
4H
6O
2) y, molecular-weight average is about 2000.As preferably; In the said ethylene-vinyl acetate copolymer; Vinyl Acetate Monomer accounts for the 32-40wt% of ethylene-vinyl acetate copolymer, selects this ethylene-vinyl acetate copolymer to help improving the flowability of pattern-making material, and accelerates the setting rate of material.
Described modified rosin can be selected various modified rosins commonly used in the prior art, for example can be staybelite, nilox resin, polymerized rosin or acrylic acid modified rosin.As preferably, acrylic acid rosin for example.
Embodiment
Described ethylene-vinyl acetate copolymer (EVA), paraffin, modified rosin, dimethyl silicone oil, Triple Pressed Stearic Acid are put into the well heater internal heating in proportion to 200-300 ℃; After stirring, add the silicon dioxide microparticle powder (preferable particle size is below the 10 μ m) and the cooling that continues to stir and treat after its temperature is reduced to 50-80 ℃ material to be rolled into club-shaped material.
Embodiment 1-5
The tool mark pattern-making material of embodiment 1-5 forms according to formulated as shown in table 1, in the table 1 among the EVA content of Vinyl Acetate Monomer be 35wt%; Described paraffin is common paraffin, and fusing point is 50-60 ℃.
Table 1 embodiment 1-5 formula rate wt%
| EVA | Paraffin | Acrylic acid rosin | Dimethyl silicone oil | Silicon-dioxide | Triple Pressed Stearic Acid | |
| Embodiment 1 | 42.5 | 21.8 | 4.8 | 17.5 | 8.5 | 4.9 |
| Embodiment 2 | 55.8 | 15.2 | 2.3 | 12.5 | 8.5 | 5.7 |
| Embodiment 3 | 47.5 | 20.5 | 2.5 | 16.5 | 6.5 | 6.5 |
| Embodiment 4 | 52.5 | 17.5 | 4.0 | 15.0 | 6.0 | 5.0 |
| Embodiment 5 | 48.5 | 20.5 | 3.2 | 15.8 | 6.2 | 5.8 |
Embodiment 6-8
Each components contents of tool mark pattern-making material of embodiment 6-8 forms according to the formulated shown in embodiment 5, and its difference is that embodiment 6 has used staybelite to substitute acrylic acid rosin; Embodiment 7 has used nilox resin to substitute acrylic acid rosin; Embodiment 8 has used polymerized rosin to substitute acrylic acid rosin.
Embodiment 9-10
Each components contents of tool mark pattern-making material of embodiment 9-10 forms according to the formulated shown in embodiment 5, and its difference is that Vinyl Acetate Monomer accounts for 25wt% in the EVA material that embodiment 9 uses; Vinyl Acetate Monomer accounts for 60wt% in the EVA material that embodiment 10 uses.
The molding club-shaped material that utilizes embodiment 1-10 to prepare, use heating tool for example heating gun carry out molding to the shallow table depression worker trace on the lead flake, and the vestige for preparing is all comparatively clear and careful.
The molding club-shaped material that utilizes embodiment 1-10 to prepare; Use heating tool for example heating gun the groove of different depths on the plank is carried out molding; Experiment shows that pattern-making material of the present invention all can obtain bottom surface and lateral vestige preferably; But the pattern-making material of embodiment 3 and 5 can extract darker special-shaped vestige, and is good with the pattern-making material of embodiment 5 especially.Use shows that tool mark pattern-making material of the present invention can extract the crime scene preferably and be destroyed the profile tool vestige on the object.
Embodiment of the present invention and concrete embodiment only are used for technical scheme of the present invention is done further elaboration and explanation; Can not limit scope of the present invention according to embodiment, the embodiment of all distortion of in claims of the present invention require the scope of protection, being made that is equal to and change is all in the present invention's scope required for protection.
Claims (9)
1. a tool mark pattern-making material is characterized in that composed of the following components: ethylene-vinyl acetate copolymer: 42.5-55.8wt%, paraffin: 15.2-21.8wt%, modified rosin: 2.3-4.8wt%, dimethyl silicone oil: 12.5-17.5wt%, silicon-dioxide: 2.7wt%-8.5wt%, stearic acid: 4.8-7.2wt%.
2. the described tool mark pattern-making material of claim 1 is characterized in that said tool mark pattern-making material is composed of the following components: ethylene-vinyl acetate copolymer: 47.5-52.5wt%, paraffin: 17.5-20.5wt%, modified rosin: 2.5-4.0wt%, dimethyl silicone oil: 15.0-16.5wt%, silicon-dioxide: 3.5wt%-6.5wt%, stearic acid: 5.0-6.5wt%.
3. claim 1 or 2 described tool mark pattern-making materials, the mass ratio that it is characterized in that said ethylene-vinyl acetate copolymer and paraffin is 2.3-2.7.
4. the described tool mark pattern-making material of claim 3, the mass ratio that it is characterized in that said ethylene-vinyl acetate copolymer and paraffin is 2.52.
5. the described tool mark pattern-making material of claim 1 is characterized in that said tool mark pattern-making material is composed of the following components: ethylene-vinyl acetate copolymer: 48.5wt%, paraffin: 20.5wt%, modified rosin: 3.2wt%, dimethyl silicone oil: 15.8wt%, silicon-dioxide: 6.2wt%, stearic acid: 5.8wt%.
6. claim 1 or 2 described tool mark pattern-making materials is characterized in that said modified rosin is staybelite, nilox resin, polymerized rosin or acrylic acid modified rosin.
7. the described tool mark pattern-making material of claim 6 is characterized in that said modified rosin is an acrylic acid modified rosin.
8. claim 1 or 2 described tool mark pattern-making materials is characterized in that straight-chain paraffin is 90-95wt% in the said paraffin.
9. a club-shaped material is characterized in that described club-shaped material is prepared by each described tool mark pattern-making material of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210172135 CN102690462B (en) | 2012-05-30 | 2012-05-30 | Moulding material for tool marks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210172135 CN102690462B (en) | 2012-05-30 | 2012-05-30 | Moulding material for tool marks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102690462A true CN102690462A (en) | 2012-09-26 |
| CN102690462B CN102690462B (en) | 2013-10-23 |
Family
ID=46856209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210172135 Expired - Fee Related CN102690462B (en) | 2012-05-30 | 2012-05-30 | Moulding material for tool marks |
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| Country | Link |
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| CN (1) | CN102690462B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586409A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Fired mold preparation technology |
| CN109312109A (en) * | 2016-04-15 | 2019-02-05 | 拉姆拉特有限公司 | Composition |
| CN110204910A (en) * | 2019-07-01 | 2019-09-06 | 北京服装学院 | A kind of resin composite materials and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5298553A (en) * | 1989-12-28 | 1994-03-29 | Daicel-Huls Ltd. | Composition for use in sculpturing and a process for manufacturing a sculptured product |
| CN101074320A (en) * | 2006-05-19 | 2007-11-21 | 中国石油化工股份有限公司 | Precisive ornament casting moulding material |
| CN101659841A (en) * | 2009-09-29 | 2010-03-03 | 陈铁旦 | Hot melt adhesive |
-
2012
- 2012-05-30 CN CN 201210172135 patent/CN102690462B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5298553A (en) * | 1989-12-28 | 1994-03-29 | Daicel-Huls Ltd. | Composition for use in sculpturing and a process for manufacturing a sculptured product |
| CN101074320A (en) * | 2006-05-19 | 2007-11-21 | 中国石油化工股份有限公司 | Precisive ornament casting moulding material |
| CN101659841A (en) * | 2009-09-29 | 2010-03-03 | 陈铁旦 | Hot melt adhesive |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103586409A (en) * | 2013-11-27 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Fired mold preparation technology |
| CN109312109A (en) * | 2016-04-15 | 2019-02-05 | 拉姆拉特有限公司 | Composition |
| CN109312109B (en) * | 2016-04-15 | 2022-10-28 | 瑞典德尔塔公司 | Composition comprising a fatty acid ester and a fatty acid ester |
| US11795318B2 (en) | 2016-04-15 | 2023-10-24 | Delta Of Sweden Ab | Composition |
| CN110204910A (en) * | 2019-07-01 | 2019-09-06 | 北京服装学院 | A kind of resin composite materials and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN102690462B (en) | 2013-10-23 |
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