CN1039039A - Pyrocondensated flat compound of radiation-crosslinked polythene - Google Patents
Pyrocondensated flat compound of radiation-crosslinked polythene Download PDFInfo
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- CN1039039A CN1039039A CN 88105163 CN88105163A CN1039039A CN 1039039 A CN1039039 A CN 1039039A CN 88105163 CN88105163 CN 88105163 CN 88105163 A CN88105163 A CN 88105163A CN 1039039 A CN1039039 A CN 1039039A
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Abstract
The present invention relates to a kind of Pyrocondensated flat compound of radiation-crosslinked polythene that is used for oil field gathering and transportation steel corrosion-resistanting insulation pipe repaired mouth.This product is a main raw material with high and low density polyethylene co-mixing system, has favorable mechanical performance, environmental stress cracking resistance and resistance toheat, can reach effect preferably.The production technique of this product and site operation are all easier, are suitable for and apply.
Description
The present invention relates to a kind of width of cloth that is used for oil field gathering and transportation steel corrosion-resistanting insulation pipe repaired mouth and penetrate crosslinked polyethylene shrink belt composition.
For a long time, oil field gathering and transportation steel corrosion-resistanting insulation pipe opening-supplementing material generally adopts peroxide crosslinking and silane crosslinking technology production.These Chemical Crosslinking Methods are relatively stricter to equipment requirements, and complex process, quality product are difficult to guarantee.The fifties, the thermal contraction product abroad begins one's study.At present, adopt the high energy particle width of cloth to penetrate crosslinked polyolefine thermal contraction product and realized suitability for industrialized production.But, handle inspection and international online retrieval, do not have to find to be used for the oil field gathering and transportation corrosion-resistanting insulation pipe, with the technical literature of identical this kind product of the present invention, only see the polyolefin products (seeing U.S. Pat-4234758, exercise question: " cable splice ") that is useful on cable splice.In recent years, unit such as China's Shengli Oil Field has developed jointly and has a kind ofly penetrated crosslinked polyethylene substrate and thermal contraction sealing tape that isoprene-isobutylene rubber-EVA hot-fusible pressure-sensitive adhesive layer is composited with the width of cloth.Better with this kind thermal contraction sealing tape repaired mouth cementability and stopping property, identify by ministerial level.But, be raw material because it mainly adopts new LDPE (film grade), thereby exist temperature tolerance and the not high enough shortcoming of mechanical property, and because this product is a take-up strap, also very not convenient during construction.
The object of the present invention is to provide a kind of the thermal contraction formula for a product and the production method thereof that are main raw material with high and low density polyethylene co-mixing system.This kind product is mainly used in oil field foam jacket pipeline and polyethylene coating joint coating on pipeline, has the favorable mechanical performance, environmental stress cracking resistance and resistance toheat.And the production technique of this product and site operation are all easier.
Content of the present invention is that a kind of width of cloth is penetrated crosslinked polyethylene shrink belt composition and production method thereof.Said composition adopts high density polyethylene(HDPE) and low density polyethylene blend, and adds ethylene/vinyl acetate copolymer (EVA) modification.For improving the processing characteristics and the anticorrosion persistence of product, adopt auxiliary agents such as dynamical photomask agent carbon black, lubricant whiteruss and phenolic antioxidant 1010.After above-mentioned raw materials and the auxiliary agent consumption high-speed mixing by a certain percentage, penetrate crosslinked and the drawing machine stretching through extrusion moulding, the high energy particle ray width of cloth, compound with glue-line, can produce functional product.
This constituent adopts high density polyethylene(HDPE) and low density polyethylene blend, and its composition of raw materials (weight percent) is as follows:
1, high density polyethylene(HDPE) A and new LDPE (film grade) B ratio range are determined (seeing aftermentioned for details) with diagram method;
2, ethylene/vinyl acetate copolymer (EVA) 10～20%.
The density available chart method of high and low density polyethylene blend is determined (seeing aftermentioned for details), and also available following formula calculates:
ρ
A+BWeight percent * ρ of=component A
AWeight percent * the ρ of+B component
BIn the formula, ρ
Aρ
Bρ
A+BBe respectively the density of high density polyethylene(HDPE), new LDPE (film grade) and blend.
Adopt high and low density polyethylene co-mixing system, both can make product reach expection intensity and temperature tolerance, possess enough flexible and compliances again.
Ethylene/vinyl acetate copolymer (EVA) is the multipolymer of ethene and vinyl acetate, and its chemical structural formula is:
VA content is 20～40% among the EVA that the present invention selects for use.EVA and polyvinyl resin consistency are good, and the polyethylene band matter of filling behind the EVA is soft, and high resilience can improve the shock-resistance and the environmental stress cracking of product.
Auxiliary agent and consumption that the present invention adopts are as follows:
Carbon black is as the sensitizing agent of dynamical photomask agent and polyethylene crosslinking.Can select granularity for use is the channel black of 15～25mm, and its consumption is 1～5%.
Phenolic antioxidant 1010 chemistry by name four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester, molecular weight 1178, structural formula is:
Consumption is 0.01～0.5%.
Whiteruss is as lubricant.The consistency of it and polyvinyl resin at high temperature increases, and produces a kind of plastification.The whiteruss Heat stability is good is suitable for extrusion moulding.To be 1～5%(be as the criterion with the product fouling that do not occur emanating its consumption).
After above-mentioned raw materials and the auxiliary agent ratio and consumption high-speed mixing in accordance with regulations, adopt extrusion moulding to make a kind of sheet material, penetrate processing through the high energy particle ray width of cloth again, make it crosslinked.Stretch by a certain percentage by drawing machine, the inner macromolecular chain of base material is stretching, cool off fast thereafter, inner molecular chain is fixed up.When practical application, through second-heating (Heating temperature is more than the softening temperature, below the fusing point), inner molecule forces stretching molecular chain to curl and bounces back, and goods return to original shape again.
According to the polyethylene shrink belt composition intensity of prescription of the present invention and explained hereafter, environmental stress cracking resistance and heat-resisting energy are good, are used for steel corrosion-resistanting insulation pipe repaired mouth and can reach comparatively ideal effect.
Fig. 1 is high and low density polyethylene ratio range chart.
Fig. 2 is the chart that is used for determining high and low density polyethylene blend density.
Fig. 3 is the relation curve of the softening degree of polyethylene with its density.
Fig. 4 is high and low density polyethylene and blend compliance correlation curve thereof.
Below in conjunction with accompanying drawing enforcement of the present invention is described further.
As previously mentioned, but high and low density polyethylene ratio range application graph method determine.In rectangular coordinate system shown in Figure 1, x axle, y axle are represented the parts by weight of low density and high density polyethylene(HDPE) respectively, gross weight umber with adulterant is 10, then put A(4,4), B(6,4), C(4,3), D(6,3) included scope (being in the rectangle ABCD zone) is the rate terms of two compositions.
The density available chart method of high and low density polyethylene blend is determined or is calculated with formula.When adopting diagram method, at first on the ordinate zou of the chart left and right sides (HDPE, LDPE are respectively high and low density polyethylene) as shown in Figure 2, find out the density of high-density component A and low-density fraction B respectively; Then, on upper and lower X-coordinate, find out the weight percent of component A, B respectively; The intersection point of the vertical line of weight percent and two density lines is the density of blend.Two examples that Fig. 2 represents are: (a) be 50% high density polyethylene(HDPE) A(density 0.960g/cm
3) and 50% new LDPE (film grade) B(density 0.930g/cm
3) blend; (b) be 25% high density polyethylene(HDPE) A(density 0.960g/cm
3) and 75% new LDPE (film grade) B(density 0.916g/cm
3) blend.Can be found by table, the density of two kinds of situation gained blend A+B is respectively 0.945 and 0.926g/cm
3
Fig. 3, Fig. 4 are respectively the softening point of polyethylene T
SofteningRelation curve and three kinds of polyethylene compliance correlation curves (curve among Fig. 4 (1), (2), (3) are respectively new LDPE (film grade), blend and high density polyethylene(HDPE)) with its density p.Therefrom as can be seen: the softening point of polyethylene increases with its density and improves; The new LDPE (film grade) softening temperature is 100～110 ℃, the high density polyethylene(HDPE) softening temperature is 120～130 ℃ (but too hard, it is inconvenient to twine), and blend begins to soften about 110 ℃, still keep certain intensity in the time of 125 ℃, just fusion fully 130 ℃ time the nearly.As seen, controlling the density of high and low poly proportioning and blend well can obtain the good product of over-all properties.
The every main performance of product that the present invention produces is good, and its test result is as follows:
Tensile strength 18MPa
Elongation at break＞400%
110 ℃ of Vicat softening points
Brittle temperature-60 ℃
Environmental stress cracking resistance＞1000 hour
Gel content 68%
Claims (4)
1, a kind of width of cloth that is used for oil field gathering and transportation steel corrosion-resistanting insulation pipe repaired mouth is penetrated crosslinked polyethylene shrink belt composition, it is characterized in that it with polyethylene and ethylene/vinyl acetate copolymer (EVA) as body material, carbon black is as polyethylene crosslinking sensitizing agent and high-effect photomask agent, four [3-(3 ', 5 '-di-t-butyl-4 '-hydroxy phenyl) propionic acid] pentaerythritol ester is as oxidation inhibitor, and whiteruss is as modifier and lubricant.
2, the width of cloth according to claim 1 is penetrated crosslinked polyethylene shrink belt composition, it is characterized in that adopting high density polyethylene(HDPE) and new LDPE (film grade) two-phase co-mixing system, wherein: a) ratio range of high and low density polyethylene two compositions is: in rectangular coordinate system, gross weight umber with adulterant is 10, the parts by weight of representing low density and high density polyethylene(HDPE) with x axle, y axle respectively, then put A(4,4), B(6,4), C(4,3), D(6,3) included scope promptly is the rate terms of two compositions; B) ethylene/vinyl acetate copolymer (EVA) accounts for 10～20%(weight).
3, the width of cloth according to claim 1 is penetrated crosslinked polyethylene shrink belt composition, it is characterized in that adjuvant used consumption (weight) is as follows:
A) whiteruss 1～5%(is as the criterion with the product fouling that do not occur emanating); B) phenolic antioxidant 1,010 0.01～0.5%; C) carbon black 1～5%.
4, the width of cloth according to claim 1 is penetrated crosslinked polyethylene shrink belt composition, it is characterized in that adopting the width of cloth to penetrate crosslinking process production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105163 CN1027697C (en) | 1988-11-17 | 1988-11-17 | Pyrocondensated flat compound of radiation-crosslinked polythene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105163 CN1027697C (en) | 1988-11-17 | 1988-11-17 | Pyrocondensated flat compound of radiation-crosslinked polythene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1039039A true CN1039039A (en) | 1990-01-24 |
| CN1027697C CN1027697C (en) | 1995-02-22 |
Family
ID=4833390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105163 Expired - Fee Related CN1027697C (en) | 1988-11-17 | 1988-11-17 | Pyrocondensated flat compound of radiation-crosslinked polythene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1027697C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331652C (en) * | 2001-07-17 | 2007-08-15 | 住友电工超效能高分子股份有限公司 | Heat contractable polyethylene tube |
| CN101701091B (en) * | 2009-10-28 | 2011-08-31 | 江苏达胜热缩材料有限公司 | Low-voltage single-wall heat-shrinkable tube and preparation method thereof |
| CN101696297B (en) * | 2009-10-28 | 2011-08-31 | 江苏达胜热缩材料有限公司 | Semiconductor single-wall thermal shrinkage pipe and preparation method thereof |
| CN101701092B (en) * | 2009-10-28 | 2011-08-31 | 江苏达胜热缩材料有限公司 | Semiconductor high-pressure single-wall heat-shrinkable tube and preparation method thereof |
| CN101704971B (en) * | 2009-11-13 | 2011-09-14 | 江苏达胜热缩材料有限公司 | Halogen-free antiflaming single-wall heat-shrinkable tube and preparation method thereof |
| CN101698720B (en) * | 2009-10-28 | 2011-09-14 | 江苏达胜热缩材料有限公司 | Medium and low pressure single wall thermal shrinkage pipe and preparation method thereof |
| CN101696295B (en) * | 2009-10-28 | 2011-09-14 | 江苏达胜热缩材料有限公司 | Semi-conducting halogen-free fire retardant single-wall heat-shrinkable tube and preparation method thereof |
| CN102268156A (en) * | 2011-07-26 | 2011-12-07 | 成都市新津事丰医疗器械有限公司 | High-density polyethylene (HDPE) material |
| CN102109070B (en) * | 2009-12-24 | 2013-03-27 | 黑龙江省科学院技术物理研究所 | Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method |
| CN104266038A (en) * | 2009-05-27 | 2015-01-07 | 江苏达胜热缩材料有限公司 | Pipeline anti-corrosion heat-shrinkable sleeve |
| CN104266039A (en) * | 2009-05-27 | 2015-01-07 | 江苏达胜热缩材料有限公司 | Heat-shrinkable wrapping tape |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387646C (en) * | 2006-05-30 | 2008-05-14 | 广州凯恒科塑有限公司 | Fire-retarding thermal-shrinked indicated double pipe of radiant cross-linked and its preparation |
-
1988
- 1988-11-17 CN CN 88105163 patent/CN1027697C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331652C (en) * | 2001-07-17 | 2007-08-15 | 住友电工超效能高分子股份有限公司 | Heat contractable polyethylene tube |
| CN104266038A (en) * | 2009-05-27 | 2015-01-07 | 江苏达胜热缩材料有限公司 | Pipeline anti-corrosion heat-shrinkable sleeve |
| CN104266039A (en) * | 2009-05-27 | 2015-01-07 | 江苏达胜热缩材料有限公司 | Heat-shrinkable wrapping tape |
| CN101701091B (en) * | 2009-10-28 | 2011-08-31 | 江苏达胜热缩材料有限公司 | Low-voltage single-wall heat-shrinkable tube and preparation method thereof |
| CN101696297B (en) * | 2009-10-28 | 2011-08-31 | 江苏达胜热缩材料有限公司 | Semiconductor single-wall thermal shrinkage pipe and preparation method thereof |
| CN101701092B (en) * | 2009-10-28 | 2011-08-31 | 江苏达胜热缩材料有限公司 | Semiconductor high-pressure single-wall heat-shrinkable tube and preparation method thereof |
| CN101698720B (en) * | 2009-10-28 | 2011-09-14 | 江苏达胜热缩材料有限公司 | Medium and low pressure single wall thermal shrinkage pipe and preparation method thereof |
| CN101696295B (en) * | 2009-10-28 | 2011-09-14 | 江苏达胜热缩材料有限公司 | Semi-conducting halogen-free fire retardant single-wall heat-shrinkable tube and preparation method thereof |
| CN101704971B (en) * | 2009-11-13 | 2011-09-14 | 江苏达胜热缩材料有限公司 | Halogen-free antiflaming single-wall heat-shrinkable tube and preparation method thereof |
| CN102109070B (en) * | 2009-12-24 | 2013-03-27 | 黑龙江省科学院技术物理研究所 | Radiation cross-linked polyethylene thermal expansion pipe and manufacturing method |
| CN102268156A (en) * | 2011-07-26 | 2011-12-07 | 成都市新津事丰医疗器械有限公司 | High-density polyethylene (HDPE) material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1027697C (en) | 1995-02-22 |
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