CN1152919C - Prepn of thermally shrinking pipe using trans-polyisoprene blend - Google Patents
Prepn of thermally shrinking pipe using trans-polyisoprene blend Download PDFInfo
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- CN1152919C CN1152919C CNB011434988A CN01143498A CN1152919C CN 1152919 C CN1152919 C CN 1152919C CN B011434988 A CNB011434988 A CN B011434988A CN 01143498 A CN01143498 A CN 01143498A CN 1152919 C CN1152919 C CN 1152919C
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Abstract
The present invention belongs to a method for preparing a heat shrinking pipe by blending trans-form polyisoprene and an ethylene-vinyl acetate copolymer. The method adopts the trans-form polyisoprene (TPI) and the ethylene-vinyl acetate copolymer (EVA30/10) which are blended by adding an antioxidant, a flame retardant and a processing auxiliary agent, and the extruded pipe is irradiated by cobalt 60, and is expanded, cooled and molded. The prepared heat shrinking pipe can be completely shrunk at the temperature of 70 DEG C, and the long-term use temperature reaches 105 DEG C.
Description
Technical field: the method that the invention belongs to preparation of thermally shrinking pipe using trans-polyisoprene blend.
Background technology: the polymer heat-shrinkage material is a kind of shape-memory material, mainly utilizes the macromolecular material of crystallization or partial crystallization to make it crosslinked by high-energy ray irradiation or chemical process, thereby makes material have specific function.Change the polymer of linear structure into reticulated structure with elastomeric state characteristic.Uncrosslinked macromolecular material presents viscous state at it more than the fusing point, and crosslinked polymer material is elastomeric state more than fusing point, can apply the external force expansion under this state, quick then cooling and shaping.This material has memory effect, and promptly when being heated crystalline melt point when above, material can return to the shape before the expansion.Chinese patent 00122353 discloses and has been entitled as " a kind of manufacture method of thermally shrinking pipe ", and this method is main raw material with the polyethylene, and the heat-shrinkable tube of manufacturing must could shrink 100 ℃ even higher temperature, and its range of application is restricted.
Summary of the invention: the purpose of this invention is to provide a kind of preparation of thermally shrinking pipe using trans-polyisoprene blend method.Adopt using trans-polyisoprene (TPI), ethylene-vinyl acetate copolymer (EVA30/10), four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester (antioxidant 1010), Zinic stearas, stearic acid, zinc oxide, lime carbonate blend in mill.The heat-shrink tube that makes can shrink under 70 ℃ of temperature fully.It can be widely used in industries such as communication, health care, machinofacture, can be at 105 ℃ of life-time service.
Preparation process is as follows: by weight, and using trans-polyisoprene 50～70%, ethylene-vinyl acetate copolymer 10～20%, lime carbonate 5～30%, zinc oxide 2～5%, antioxidant 1010 1.0～1.5%, Zinic stearas 1.0～1.5%, stearic acid 0.5～1.0%;
The temperature of mill is adjusted to 100～150 ℃, at first open the refining using trans-polyisoprene, add ethylene-vinyl acetate copolymer then successively, antioxidant 1010, Zinic stearas, stearic acid, lime carbonate, zinc oxide, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, extrusion temperature: 50～70 ℃ in the first section feeding mouth, second section 70～90 ℃, the 3rd section 90～110 ℃, the 4th section 110～130 ℃, single screw extrusion machine is extruded into pipe, extrusion temperature: 60～80 ℃ in the first section feeding mouth, second section 80～100 ℃, the 3rd section 100～120 ℃, the 4th section 120～150 ℃; Pipe is through cobalt 60 irradiations, and irradiation dose is 110～150Kgy; Pipe behind the irradiation is expanded to 100～150% of former pipe diameter, cooling and shaping under 80～105 ℃ temperature.
The heat-shrinkable tube mechanical property that the present invention is prepared: tensile strength 11～19Mpa, elongation 350～850%, thermal ageing is tensile strength 10～18MPa after 136 ± 2 ℃/168 hours, elongation 300～800%, electrical property: disruptive strength 13～18KV/mm, volume specific resistance 5.8 * 10
13～1.5 * 10
15Ω .cm.
Embodiment is as follows:
Embodiment 1
Under 120 ℃ of mills, add 70 parts of using trans-polyisoprenes, add (30/10) 20 part of ethylene-vinyl acetate copolymer after plasticating successively, 1 part of antioxidant 1010,1 part of Zinic stearas, 3 parts in zinc oxide, 5 parts in lime carbonate, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, single screw extrusion machine is extruded into pipe, pipe is through cobalt 60 irradiations, and irradiation dose is 130KGy.Pipe behind the irradiation is expanded to 100% of former pipe diameter, cooling and shaping under 80 ℃ temperature.
Embodiment 2
Under 120 ℃ of mills, add 50 parts of using trans-polyisoprenes, add (30/10) 20 part of ethylene-vinyl acetate copolymer after plasticating successively, 1 part of antioxidant 1010,1 part of Zinic stearas, 5 parts in zinc oxide, 23 parts in lime carbonate, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, single screw extrusion machine is extruded into pipe, pipe is through cobalt 60 irradiations, and irradiation dose is 110KGy.Pipe behind the irradiation is expanded to 150% of former pipe diameter, cooling and shaping under 105 ℃ temperature.
Embodiment 3
Under 145 ℃ of mills, add 60 parts of using trans-polyisoprenes, add (30/10) 10 part of ethylene-vinyl acetate copolymer after plasticating successively, 1 part of antioxidant 1010,1 part of Zinic stearas, 1 part of stearic acid, 2 parts in zinc oxide, 25 parts in lime carbonate, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, single screw extrusion machine is extruded into pipe, and pipe is through cobalt 60 irradiations, and irradiation dose is 150KGy.Pipe behind the irradiation is expanded to 120% of former pipe diameter, cooling and shaping under 90 ℃ temperature.
Embodiment 4
Under 150 ℃ of mills, add 55 parts of using trans-polyisoprenes, add (30/10) 10 part of ethylene-vinyl acetate copolymer after plasticating successively, 1 part of antioxidant 1010,1.5 parts of Zinic stearass, 0.5 part of stearic acid, 2 parts in zinc oxide, 30 parts in lime carbonate, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, single screw extrusion machine is extruded into pipe, and pipe is through cobalt 60 irradiations, and irradiation dose is 150KGy.Pipe behind the irradiation is expanded to 100% of former pipe diameter, cooling and shaping under 90 ℃ temperature.
Embodiment 5
Under 150 ℃ of mills, add 55 parts of using trans-polyisoprenes, add (30/10) 10 part of ethylene-vinyl acetate copolymer after plasticating successively, 1.5 parts of antioxidant 1010s, 1 part of Zinic stearas, 0.5 part of stearic acid, 30 parts in lime carbonate, 2 parts in zinc oxide, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, single screw extrusion machine is extruded into pipe, and pipe is through cobalt 60 irradiations, and irradiation dose is 150KGy.Pipe behind the irradiation is expanded to 100% of former pipe diameter, cooling and shaping under 90 ℃ temperature.
Claims (1)
1. the method for a preparation of thermally shrinking pipe using trans-polyisoprene blend, be through plasticate, pulling-on piece, pelletizing, granulation, extrude, irradiation, expansion, it is characterized in that by weight, select using trans-polyisoprene 50～70%, ethylene-vinyl acetate copolymer 10～20%, lime carbonate 5～30%, zinc oxide 2～5%, four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester 1.0～1.5%, Zinic stearas 1.0～1.5%, stearic acid 0.5～1.0% is a raw material; The temperature of mill is adjusted to 100～150 ℃, at first open the refining using trans-polyisoprene, add ethylene-vinyl acetate copolymer then successively, antioxidant 1010, Zinic stearas, stearic acid, lime carbonate, zinc oxide, the even post-tensioning of plasticating is in blocks, cooling back pelletizing, through the twin screw extruder extruding pelletization, extrusion temperature: 50～70 ℃ in the first section feeding mouth, second section 70～90 ℃, the 3rd section 90～110 ℃, the 4th section 110～130 ℃, single screw extrusion machine is extruded pipe, extrusion temperature: 60～80 ℃ in the first section feeding mouth, second section 80～100 ℃, the 3rd section 100～120 ℃, the 4th section 120～150 ℃; Pipe is through cobalt 60 irradiations, and irradiation dose is 110～150KGy; Pipe behind the irradiation is expanded to 100～150% of former pipe diameter, cooling and shaping under 80～105 ℃ temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011434988A CN1152919C (en) | 2001-12-29 | 2001-12-29 | Prepn of thermally shrinking pipe using trans-polyisoprene blend |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011434988A CN1152919C (en) | 2001-12-29 | 2001-12-29 | Prepn of thermally shrinking pipe using trans-polyisoprene blend |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1357572A CN1357572A (en) | 2002-07-10 |
| CN1152919C true CN1152919C (en) | 2004-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011434988A Expired - Fee Related CN1152919C (en) | 2001-12-29 | 2001-12-29 | Prepn of thermally shrinking pipe using trans-polyisoprene blend |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354989C (en) * | 2005-09-01 | 2007-12-12 | 赵成刚 | Environmental protection type fire retardant thermal shrinkage tube without halogen |
| US8281448B2 (en) | 2005-10-24 | 2012-10-09 | Colgate-Palmolive Company | Oral care implement having one or more moving sections |
| CN101108909B (en) * | 2006-07-17 | 2010-10-13 | 深圳长园电子材料有限公司 | Shape memory material |
| CN102276880B (en) * | 2011-06-24 | 2012-10-10 | 陕西科技大学 | Memory rubber for repairing water pipe, and preparation method and using method thereof |
| CN104610594A (en) * | 2015-02-04 | 2015-05-13 | 青岛第派新材有限公司 | Low-temperature thermal-shrinkage shape memory material and preparation method thereof |
| CN109776888A (en) * | 2019-01-23 | 2019-05-21 | 深圳市宏商材料科技股份有限公司 | A kind of ultralow temperature shrinks thermal contraction casing tube and preparation method thereof |
| CN113072722B (en) * | 2021-03-03 | 2022-08-23 | 中国科学院化学研究所 | Preparation method of radiation cross-linked trans-1, 4-polyisoprene material and trans-1, 4-polyisoprene material |
| CN115819874B (en) * | 2022-12-09 | 2024-05-14 | 中国皮革和制鞋工业研究院（晋江）有限公司 | Foam composite material for soles of sports shoes, preparation method of foam composite material and soles of sports shoes |
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2001
- 2001-12-29 CN CNB011434988A patent/CN1152919C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1357572A (en) | 2002-07-10 |
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