CN105238287A - Polyethylene heat shrinkable tape capable of being applied in low temperature environment - Google Patents
Polyethylene heat shrinkable tape capable of being applied in low temperature environment Download PDFInfo
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- CN105238287A CN105238287A CN201510655624.1A CN201510655624A CN105238287A CN 105238287 A CN105238287 A CN 105238287A CN 201510655624 A CN201510655624 A CN 201510655624A CN 105238287 A CN105238287 A CN 105238287A
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- low temperature
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- thermal contraction
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Abstract
The invention discloses a polyethylene heat shrinkable tape capable of being applied in a low temperature environment, and is used for solving the problems that a conventional polyethylene heat shrinkable tape becomes brittle and cannot be applied when the temperature is less than -15 DEG C. The product is formed by compounding a low-temperature type viscoelastic sealant and a low-temperature type crosslinked polyethylene base material through an extrusion or tape-casting method. The polyethylene heat shrinkable tape can be stored, transported, mounted and constructed in the low temperature environment; the polyethylene heat shrinkable tape mounted on a pipeline can be placed in a low temperature outdoor environment, and frost cracking and other low temperature freezing damage risks cannot be generated.
Description
Technical field
The present invention relates to a kind of polyethylene thermal contraction strap, be mainly used in steel pipe Crater antiseptic repaired mouth and insulating pipe outer jacket waterproof repaired mouth.
Background technology
Polyethylene thermal contraction strap is the pipeline corrosion protection opening-supplementing material and anticorrosion coating on pipeline repair materials widely applied, and it is composited by radiant crosslinked polyethylene base material and hot-melt sealant.But common polyethylene thermal contraction strap will become fragile lower than when-15 DEG C in envrionment temperature, cause applying; The polyethylene thermal contraction strap be arranged on pipeline also can be caused applying unsuccessfully by bursting by freezing at low ambient temperatures.
Along with the construction of China's energy source pathway, some pipelines need to lay under psychro-environment, and envrionment temperature, far below-15 DEG C, therefore needs to invent a kind of low temperature modification polyethylene thermal contraction strap can applied at low temperature environment.
Summary of the invention
The object of this invention is to provide a kind of polyethylene thermal contraction strap that can apply at low ambient temperatures, applied environment temperature is minimum can to-35 DEG C.Low temperature modification polyethylene thermal contraction strap provided by the present invention, can carry out accumulating and installation at low ambient temperatures, eliminates the shortcoming of common polythene shrink belt easily embrittlement at low ambient temperatures; Bursting by freezing danger can not be there is in mounted low temperature modification polyethylene thermal contraction strap more than-35 DEG C.
In order to realize foregoing invention object, the technical solution used in the present invention is:
The polyethylene thermal contraction strap that can apply at low ambient temperatures, its preparation method is:
(1) low temperature modification visco-elasticity seal gum is manufactured: isoprene-isobutylene rubber, polyisobutene, these matrix resins of polyolefine are passed through with additive to mix, modify and graft forms;
(2) low temperature modification crosslinked polyethylene base material is manufactured: by the polyethylene of the suitable trade mark or performance and properties-correcting agent through physical blending granulation, after extruding, carry out radiation crosslinking form;
(3) by extrude or low temperature visco-elasticity seal gum and low temperature modification crosslinked polyethylene base material are compounded to form low temperature modification polyethylene thermal contraction strap by casting method.
Further, low temperature modification visco-elasticity seal gum in technical solution of the present invention described in step (1), according to listed as parts by weight, by isoprene-isobutylene rubber 100 parts, the polyisobutene that molecular weight 40000 ~ 80000 is 0 ~ 30 part, VA content is ethylene-vinyl acetate copolymer EVA45 ~ 100 part of 15% ~ 28%, through mediating or being warming up to 130 ~ 150 DEG C after banburying, add dicumyl peroxide 0.1 ~ 0.5 part, maleic anhydride 1.0 ~ 3.0 parts, after mediating 10-30 minutes, add 0.1 ~ 0.6 part, oxidation inhibitor, naphthenic oil 5 ~ 30 parts, petroleum resin 5 ~ 50 parts of kneadings form.
Further, low temperature modification crosslinked polyethylene base material in technical solution of the present invention described in step (2), according to listed as parts by weight, by high density polyethylene(HDPE) 100 parts, polyolefin elastomer 5 ~ 35 parts, black masterbatch 0.5 ~ 2.5 part, 0.1 ~ 2.0 part, oxidation inhibitor, after physical blending granulation, be band through extruder for shaping, and form through radiation crosslinking.
Compared with prior art, the present invention has the following advantages:
1. adopt hot-melt sealant different from common polythene shrink belt, low temperature modification polyethylene thermal contraction strap of the present invention adopts low temperature modification visco-elasticity seal gum, seal gum embrittlement temperature can be made to be down to less than-35 DEG C, and low temperature visco-elasticity seal gum of the present invention significantly improves the low-temperature performance of seal gum;
2. the traditional crosslinked polyethylene base material adopted from common polythene shrink belt is different, and low temperature modification shrink belt of the present invention adopts low temperature modification crosslinked polyethylene base material, and this base material can be resisted and lax freezing shrinkage internal stress, and base material brittle failure temperature is significantly reduced;
3. the technical program is by having excellent low temperature over-all properties to composition low temperature modification polyethylene thermal contraction strap.Compared with conventional polyethylene shrink belt, low temperature modification polyethylene thermal contraction strap can carry out accumulating, installation under low temperature environment (more than-35 DEG C), the low temperature modification polyethylene thermal contraction strap be arranged on pipeline can be placed under low temperature open-air atmosphere, the low temperature freezing-disasters such as bursting by freezing can not occur dangerous.
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
1. low temperature modification visco-elasticity seal gum is manufactured: in Banbury mixer, add isoprene-isobutylene rubber (IIR1751) 100(weight part, as follows), polyisobutene (molecular weight 50000) 30, EVA1850(VA content 28%) 75, through mediating or temperature control to 140 ± 10 DEG C after banburying, add dicumyl peroxide (DCP) 0.1, maleic anhydride (MAH) 1.0, mediate after 15 minutes, add antioxidant 1010 0.5, naphthenic oil 20, C5 petroleum resin 35, then mediate or banburying 10 minutes, to obtain final product.
This product has following performance: softening temperature is greater than 105 DEG C; Brittle temperature is less than-35 DEG C; Shearing resistance (23 DEG C) is greater than 0.5MPa; Stripping strength (PE/ non-solvent epoxy priming paint) is greater than 70N/cm.
2. low temperature modification crosslinked polyethylene base material is manufactured: add high density polyethylene(HDPE) 100(weight part at mixer, lower same), polyolefin elastomer octene content (15%) 15, black masterbatch 1.5, antioxidant 1010 0.6, irgasfos 168 0.4, mix rear granulation, be thickness 1.0 ~ 2.5mm continuous sheet in extruder for shaping after drying, carry out irradiation dose 400KGy with high-energy electron accelerator, to obtain final product.
This product has following performance: tensile strength is greater than 20MPa, and elongation at break is greater than 500%, and brittle temperature is less than-90 DEG C, and Vicat softening point is greater than 95 DEG C, and the temperature that fractures after freezing is less than-35 DEG C.
3. by above-mentioned low temperature visco-elasticity seal gum after forcing machine melting, extrude curtain coating on above-mentioned low temperature modification crosslinked polyethylene base material, under visco-elasticity seal gum molten state, be combined into low temperature modification polyethylene thermal contraction strap with polyethylene base material.
Gained low temperature modification polyethylene thermal contraction strap has following outstanding low-temperature performance, and conventional pipeline corrosion protection requirement can be met: low temperature flexibility passes through-35 DEG C of tests, low temperature uncoiling performance passes through-35 DEG C of tests,-35 DEG C of tests are passed through in the freezing breakdown test of cryostat, and other antiseptic properties meet GB/T23257-2009 standard-required.
The finished product of gained, can be directly used in pipeline corrosion protection repaired mouth under low temperature environment, also can support the use with non-solvent epoxy priming paint, for pipeline corrosion protection repaired mouth under low temperature environment.
Claims (3)
1. the polyethylene thermal contraction strap can applied at low ambient temperatures, its preparation method is:
(1) low temperature modification visco-elasticity seal gum is manufactured: isoprene-isobutylene rubber, polyisobutene, these matrix resins of polyolefine are passed through with additive to mix, modify and graft forms;
(2) low temperature modification crosslinked polyethylene base material is manufactured: by the polyethylene of the suitable trade mark or performance and properties-correcting agent through physical blending granulation, after extruding, carry out radiation crosslinking form;
(3) by extrude or low temperature visco-elasticity seal gum and low temperature modification crosslinked polyethylene base material are compounded to form low temperature modification polyethylene thermal contraction strap by casting method.
2. the polyethylene thermal contraction strap that can apply at low ambient temperatures according to claim 1, it is characterized in that: the low temperature modification visco-elasticity seal gum described in step (1), according to listed as parts by weight, by isoprene-isobutylene rubber 100 parts, the polyisobutene that molecular weight 40000 ~ 80000 is 0 ~ 30 part, VA content is ethylene-vinyl acetate copolymer EVA45 ~ 100 part of 15% ~ 28%, through mediating or being warming up to 130 ~ 150 DEG C after banburying, add dicumyl peroxide 0.1 ~ 0.5 part, maleic anhydride 1.0 ~ 3.0 parts, after mediating 10-30 minutes, add 0.1 ~ 0.6 part, oxidation inhibitor, naphthenic oil 5 ~ 30 parts, petroleum resin 5 ~ 50 parts of kneadings form.
3. the polyethylene thermal contraction strap that can apply at low ambient temperatures according to claim 1, it is characterized in that: the low temperature modification crosslinked polyethylene base material described in step (2), according to listed as parts by weight, by high density polyethylene(HDPE) 100 parts, polyolefin elastomer 5 ~ 35 parts, black masterbatch 0.5 ~ 2.5 part, 0.1 ~ 2.0 part, oxidation inhibitor, after physical blending granulation, be band through extruder for shaping, and form through radiation crosslinking.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510655624.1A CN105238287B (en) | 2015-10-12 | 2015-10-12 | A kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510655624.1A CN105238287B (en) | 2015-10-12 | 2015-10-12 | A kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures |
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| CN105238287A true CN105238287A (en) | 2016-01-13 |
| CN105238287B CN105238287B (en) | 2018-06-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977101A (en) * | 2018-08-15 | 2018-12-11 | 江苏宝力泰新材料科技有限公司 | A kind of external protective material and preparation method thereof for aerial pipeline |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103087385A (en) * | 2012-11-23 | 2013-05-08 | 深圳市长园长通新材料有限公司 | High-density high-temperature heat-shrinkable pressure-sensitive tape and preparation method thereof |
| CN104479592A (en) * | 2014-12-15 | 2015-04-01 | 江苏达胜热缩材料有限公司 | Low-temperature 2PE hot melt adhesive and preparation method thereof |
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2015
- 2015-10-12 CN CN201510655624.1A patent/CN105238287B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103087385A (en) * | 2012-11-23 | 2013-05-08 | 深圳市长园长通新材料有限公司 | High-density high-temperature heat-shrinkable pressure-sensitive tape and preparation method thereof |
| CN104479592A (en) * | 2014-12-15 | 2015-04-01 | 江苏达胜热缩材料有限公司 | Low-temperature 2PE hot melt adhesive and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108977101A (en) * | 2018-08-15 | 2018-12-11 | 江苏宝力泰新材料科技有限公司 | A kind of external protective material and preparation method thereof for aerial pipeline |
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| CN105238287B (en) | 2018-06-26 |
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