CN105238287B - A kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures - Google Patents
A kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures Download PDFInfo
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- CN105238287B CN105238287B CN201510655624.1A CN201510655624A CN105238287B CN 105238287 B CN105238287 B CN 105238287B CN 201510655624 A CN201510655624 A CN 201510655624A CN 105238287 B CN105238287 B CN 105238287B
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Abstract
The invention discloses a kind of polyethylene thermal contraction straps that can be applied at low ambient temperatures, and solving existing polyethylene thermal contraction strap can become fragile when less than 15 DEG C, the problem of can not applying.The product is combined using low form viscoplasticity fluid sealant with low form crosslinked polyethylene base material by extrusion or casting method.The polyethylene thermal contraction strap can storage and transportation, installation at low ambient temperatures, the low form polyethylene thermal contraction strap on pipeline can be placed under low temperature open-air atmosphere, will not occur the low temperature freezing-disasters such as bursting by freezing danger.
Description
Technical field
The present invention relates to a kind of polyethylene thermal contraction straps, are mainly used for protecting outside steel pipe Crater antiseptic repaired mouth and insulating tube
Layer waterproof repaired mouth.
Background technology
Polyethylene thermal contraction strap is widely used pipeline corrosion protection opening-supplementing material and anticorrosion coating on pipeline repair materials, it is
It is combined by radiant crosslinked polyethylene base material and hot-melt sealant.However, common polyethylene thermal contraction strap is in environment temperature
It will become fragile during less than -15 DEG C, lead to not apply；Polyethylene thermal contraction strap on pipeline has been mounted on it at low ambient temperatures
It can be caused by bursting by freezing using failure.
With the construction of China's energy source pathway, some pipelines needs are laid under psychro-environment, and environment temperature is far below -15
DEG C, it is therefore desirable to invent it is a kind of can be in the low form polyethylene thermal contraction strap that low temperature environment is applied.
Invention content
The object of the present invention is to provide a kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures, application environment temperature
It is minimum can be to -35 DEG C.Low form polyethylene thermal contraction strap provided by the present invention can carry out storage and transportation and installation at low ambient temperatures
Construction, eliminate common polythene shrink belt at low ambient temperatures easy embrittlement the shortcomings that；Mounted low form polyethylene heat
Bursting by freezing danger will not occur at -35 DEG C or more for shrinkage band.
In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is：
A kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures, preparation method are：
（1）Manufacture low form viscoplasticity fluid sealant：Butyl rubber, polyolefin these matrix resins are added in after mixing
Initiator and maleic anhydride continue modification and are grafted；
（2）Manufacture low form crosslinked polyethylene base material：High density polyethylene (HDPE) is granulated with modifying agent through physical blending, through squeezing
Crosslinking with radiation is carried out after going out to form；
（3）It is compounded to form with low form crosslinked polyethylene base material by squeezing out casting method by low temperature viscoplasticity fluid sealant low
Warm type polyethylene thermal contraction strap.
Further, step in technical solution of the present invention（1）The low form viscoplasticity fluid sealant, in parts by weight
It calculates, the second that 0~30 part of the polyisobutene for being by 100 parts of butyl rubber, molecular weight 40000~80000, VA contents are 15%~28%
Alkene-vinyl acetate co-polymer EVA45~100 part is warming up to 130~150 DEG C after kneading or mixing, and it is different to add in peroxidating two
0.1~0.5 part of propyl benzene, 1.0~3.0 parts of maleic anhydride after mediating 10-30 minutes, add in 0.1~0.6 part of antioxidant, ring
5~30 parts of alkane oil, 5~50 parts of Petropols are mediated.
Further, step in technical solution of the present invention（2）The low form crosslinked polyethylene base material, according to parts by weight
It calculates, by 100 parts of high density polyethylene (HDPE), 5~35 parts of polyolefin elastomer, 0.5~2.5 part of black masterbatch, antioxidant 0.1~2.0
Part, after being granulated by physical blending, extruded machine extrusion molding is band, and crosslinking by radiation forms.
Compared with prior art, the present invention has the following advantages：
1. different using hot-melt sealant from common polythene shrink belt, low form polyethylene of the invention is heat-shrinked
Band can make fluid sealant brittle temperature be down to -35 DEG C hereinafter, the low temperature viscoplasticity of the present invention is close using low form viscoplasticity fluid sealant
Sealing significantly improves the cryogenic property of fluid sealant；
2. different from traditional crosslinked polyethylene base material that common polythene shrink belt uses, low form heat of the present invention is received
Contracting band is using low form crosslinked polyethylene base material, which can resist and relax freezing shrinkage internal stress so that base material brittle failure temperature
It is greatly lowered；
3. the technical program to composition low form polyethylene thermal contraction strap by having excellent low temperature comprehensive performance.With
Conventional polyethylene shrink belt is compared, and low form polyethylene thermal contraction strap can be in low temperature environment（- 35 DEG C or more）Lower progress storage and transportation,
Installation, the low form polyethylene thermal contraction strap on pipeline can be placed under low temperature open-air atmosphere, Bu Huifa
The low temperature freezing-disasters such as raw bursting by freezing are dangerous.
With reference to embodiment, the present invention is described further.
Embodiment 1
1. manufacture low form viscoplasticity fluid sealant：Butyl rubber (IIR1751) 100 is added in mixer（Parts by weight, with
Similarly hereinafter）, polyisobutene（Molecular weight 50000）30、EVA1850（VA contents 28%）75, after kneading or mixing temperature control to 140 ±
10 DEG C, add in cumyl peroxide（DCP）0.1st, maleic anhydride（MAH）1.0, after mediating 15 minutes, add in antioxidant 1010
0.5th, naphthenic oil 20, C5 Petropols 35, then mediate or mixing 10 minutes to get.
The product has the following performance：Softening point is more than 105 DEG C；Brittle temperature is less than -35 DEG C；Shear strength（23
℃）More than 0.5MPa；Peel strength（PE/ non-solvent epoxy priming paint）More than 70N/cm.
2. manufacture low form crosslinked polyethylene base material：High density polyethylene (HDPE) 100 is added in batch mixer（Parts by weight, similarly hereinafter）,
Polyolefin elastomer octene content（15% ）15, black masterbatch 1.5, antioxidant 1010 0.6, irgasfos 168 0.4, mixing is
It is even after be granulated, after drying extruder for shaping be thickness 1.0~2.5mm continuous sheets, with high-energy electron accelerator into
Row irradiation dose 400KGy to get.
The product has the following performance：Tensile strength is more than 20MPa, and elongation at break is more than 500%, brittle temperature
Less than -90 DEG C, Vicat softening point is more than 95 DEG C, and the temperature that fractures after frost is less than -35 DEG C.
3. after the extruded machine melting of above-mentioned low temperature viscoplasticity fluid sealant, curtain coating is squeezed out in above-mentioned low form crosslinked polyethylene
On base material, low form polyethylene thermal contraction strap is combined into polyethylene base material under viscoplasticity fluid sealant molten condition.
Gained low form polyethylene thermal contraction strap has cryogenic property following prominent, and can meet conventional pipeline corrosion protection
It is required that：Low temperature flexibility is led to by -35 DEG C of tests, low temperature uncoiling performance by -35 DEG C of tests, cryogenic box frost breakdown test
- 35 DEG C of tests are crossed, other antiseptic properties meet the requirement of GB/T 23257-2009 standards.
The final products of gained can be directly used for pipeline corrosion-resistanting interpolating port under low temperature environment, also can be with non-solvent epoxy priming paint
It matches, for pipeline corrosion-resistanting interpolating port under low temperature environment.
Claims (1)
1. a kind of polyethylene thermal contraction strap that can be applied at low ambient temperatures, preparation method are：
（1）Manufacture low form viscoplasticity fluid sealant：Calculate in parts by weight, by 100 parts of butyl rubber, molecular weight 40000~
Ethylene-vinyl acetate copolymer EVA45~100 part that 80000 0~30 part of the polyisobutene for being, VA contents are 15%~28%,
130~150 DEG C are warming up to after kneading or mixing, adds in 0.1~0.5 part of cumyl peroxide, maleic anhydride 1.0~3.0
Part, after mediating 10-30 minutes, add in 5~50 parts of 0.1~0.6 part of antioxidant, 5~30 parts of naphthenic oil, Petropols kneadings
It forms；
（2）Manufacture low form crosslinked polyethylene base material：It calculates in parts by weight, by 100 parts of high density polyethylene (HDPE), polyolefin elastic
5~35 parts of body, 0.5~2.5 part of black masterbatch, 0.1~2.0 part of antioxidant, after being granulated by physical blending, extruded machine is extruded into
Type is band, and crosslinking by radiation forms；
（3）Low temperature viscoplasticity fluid sealant and low form crosslinked polyethylene base material are compounded to form by low temperature by extrusion or casting method
Type polyethylene thermal contraction strap.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 CN105238287A (en) | 2016-01-13 |
| CN105238287B true CN105238287B (en) | 2018-06-26 |
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| CN201510655624.1A Active 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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