CN103602289A - Pipeline joint watertightness anticorrosion hot melt adhesive - Google Patents
Pipeline joint watertightness anticorrosion hot melt adhesive Download PDFInfo
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- CN103602289A CN103602289A CN201310517421.7A CN201310517421A CN103602289A CN 103602289 A CN103602289 A CN 103602289A CN 201310517421 A CN201310517421 A CN 201310517421A CN 103602289 A CN103602289 A CN 103602289A
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- hot melt
- watertightness
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- melt adhesive
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Abstract
The invention provides a pipeline joint watertightness anticorrosion hot melt adhesive. The formula of the hot melt adhesive comprises the following components: by weight, 25-45% of EVA resin, 15-30% of a tackifier, 1-20% of a flexibilizer, 25-35% of paraffin, 1-7% of a composite auxiliary agent and 0.5-2% of an anti-oxidant, wherein the VA content of EVA resin is 28%; melt index (MI) of EVA resin is 150g/10min; and the tackifier is thermoplastic phenolic resin. The invention provides a pipeline joint watertightness anticorrosion hot melt adhesive which is an efficient water-stop hot melt adhesive prepared by using EVA resin as the matrix resin and using thermoplastic phenolic resin as the tackifier. The hot melt adhesive has good waterproof airtightness, high bonding strength and excellent resistance to chemical corrosion, and can meet anticorrosion requirement of a pipeline joint which is immersed in seawater for a long time.
Description
Technical field
The present invention relates to pipeline corrosion protection, in particular to a kind of joint coating on pipeline watertightness antiseptic hot melt glue.
Background technology
Joint coating on pipeline place is normal at present adopts coated external anti-corrosion layer method to guarantee its preservative effect, external anti-corrosion layer is to consist of the crosslinked PE sheet material that applies certain thickness hot melt adhesive, during use, preservative coat is coated on to tubing repaired mouth place, then its heating is made to hot melt adhesive melting, orientation PE shrinks, rely on its PE convergent force to make hot melt adhesive be close to joint coating on pipeline place, complete rotproofing.Therefore, hot-melt adhesive for preventing corrosion of repaired need have following performance: (1) all has good cohesive force (higher peel off, shear fracture intensity) to non-polar substrate (PE) and polar substrates (steel pipe), guarantees that in pipeline use procedure, preservative coat can not come off; (2) requiring its melting under lower than PE shrinkage temperature can carry out machinery applies; During higher than PE shrinkage temperature, with PE, shrink the bonding realizing steel pipe and PE, realize sealing corrosion object; (3) hot melt adhesive should have preferably corrosion-resistant, weathering resistance and have good elasticity and toughness.
Along with the exploitation to oceanic resources, various subsea equipments, pipeline etc. are immersed in seawater for a long time, can be subject to oxidation, destruction and the corrosion of seawater, therefore, the hot melt adhesive that underwater pipeline needs water-lute to its seal, anticorrosion increasing the service life.But common hot melt adhesive exists some problems, the waterproof, anticorrosion that is unfavorable for pipeline, for example: hot melt adhesive softening temperature is high, contain rosin pipeline is had to acid attack effect, equipment is had to corrodibility, not easy to assemble and maintenance, and most of hot melt adhesive is opaque, is coated in the corrosion condition that is not easy to find out joint coating on pipeline on joint coating on pipeline.
Summary of the invention
The invention solves deficiency of the prior art, the joint coating on pipeline watertightness that a kind of water-lute is good, cohesiveness is good, property easy to assemble is good antiseptic hot melt glue is provided.
Technical scheme of the present invention is: a kind of joint coating on pipeline watertightness antiseptic hot melt glue, and by mass percentage, its formula comprises: EVA resin: 25～45%, tackifier: 15～30%, toughner: 1～20%, paraffin: 25～35%, composite assistant: 1～7%, oxidation inhibitor: 0.5～2%; Wherein, the VA content of described EVA resin is 28%, and the melt index MI of described EVA resin is 150g/10min; Described tackifier are novolac resin.
In a preferred embodiment of the present invention, further comprise, by mass percentage, its formula comprises: EVA resin: 35%, and tackifier: 20%, toughner: 10%, paraffin: 30%, composite assistant 3%, oxidation inhibitor: 2%; Wherein, the VA content of described EVA resin is 28%, and the melt index MI of described EVA resin is 150g/10min; Described tackifier are novolac resin.
In the present invention's formula, select novolac resin as tackifier, replaced traditional hot melt adhesive to use rosin as tackifier, avoided rosin to there is acid attack effect to pipeline on the one hand, novolac resin has improved the antiseptic property of hot melt adhesive greatly on the other hand, has effectively improved the adhesive property of hot melt adhesive; Paraffin in formula can reduce the viscosity of hot melt adhesive system, the wettability of improved system, reduces solidification, and can reduce the cost of hot melt adhesive, but paraffin too much can cause the fragility of hot melt adhesive and reduce adhesive power because paraffin to be controlled at a certain amount of in.
In a preferred embodiment of the present invention, further comprise, toughner is polyisobutene or diphenylmethanediisocyanate.In formula of the present invention more preferably polyisobutene as toughner, polyisobutene can be uniformly dispersed in hot melt adhesive system, under low-temperature condition, when being subject to External Force Acting, it can absorb a large amount of Impact energies, thereby improved the low-temperature performance of hot melt adhesive, made hot melt adhesive also can play good effect at a lower temperature.
In a preferred embodiment of the present invention, further comprise, described composite assistant is to be the compound that catalytic material polymerization is made by the by product C5 fraction of ethylene production and C 9 fraction.The cost of this composite assistant that the present invention selects is lower, and it has good solubility, water tolerance, insulativity, cohesiveness etc., and it has good chemical stability to soda acid, joined in hot melt adhesive system, contributed to improve watertightness, acid and alkali-resistance antiseptic property and the cohesiveness etc. of hot melt adhesive.
In a preferred embodiment of the present invention, further comprise, described oxidation inhibitor is one or more mixtures in antioxidant 1010, antioxidant 1076 and irgasfos 168.
In a preferred embodiment of the present invention, further comprise, a kind of method for the preparation of joint coating on pipeline watertightness antiseptic hot melt glue of the present invention, comprises the following steps:
(1) according to each component in formula, take raw material, novolac resin, composite assistant and paraffin are joined in Banbury mixer, and lead to N in Banbury mixer
2, N
2the time that passes into be 20 minutes;
(2) pass into N
2after end, start heat temperature raising, when novolac resin starts to melt, toughner is put in Banbury mixer, when temperature is increased to 160～170 ℃, started to stir, and start to add gradually EVA resin, until after all EVA raw materials all add, continue heating 10～15 minutes, each component is fully mixed;
(3) mixture fully mixing in step (2) is cooled to 130 ℃, mixture is poured out to Banbury mixer, continue to be cooled to room temperature and obtain joint coating on pipeline watertightness antiseptic hot melt glue.
In a preferred embodiment of the present invention, further comprise, this process of EVA resin that adds gradually described in step (2) continues 1 hour.
The invention solves the defect problem of prior art, there is following beneficial effect:
Joint coating on pipeline watertightness antiseptic hot melt glue provided by the invention, that a kind of EVA of usining resin is as matrix resin and added the High-efficient Water seal hot melting glue that novolac resin is prepared into as tackifier, the waterproof sealing of this hot melt adhesive is better, cohesive strength is high, resistance to chemical corrosion is good, can be good at meeting the requirement for anticorrosion of the joint coating on pipeline of long period of soaking in seawater.
Embodiment
In order to make those skilled in the art person understand better the present invention, and above-mentioned advantage of the present invention can be become apparent more, below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1
(1) by the hot melt adhesive finished product of 100 kilograms, prepare, take: (the VA content of EVA resin is 28% to 35%EVA resin, and melt index MI is 150g/10min, identical in following examples), 20% novolac resin, 10% polyisobutene, 30% paraffin, 3% composite assistant, 2% antioxidant 1010; Novolac resin, composite assistant and paraffin are joined in Banbury mixer, and lead to N in Banbury mixer
2, N
2the time that passes into be 20 minutes; Pass into N herein
2object be to guarantee that reaction carries out under inert conditions.
(2) pass into N
2after end, start heat temperature raising, when novolac resin starts to melt, toughner is put in Banbury mixer, when temperature is increased to 165 ℃, start to stir, and start to add gradually EVA resin, until after all EVA raw materials all add, add gradually the process of EVA approximately to continue 1 hour, continue heating 15 minutes, each component is fully mixed;
(3) mixture fully mixing in step (2) is cooled to 130 ℃, mixture is poured out to Banbury mixer, continue to be cooled to room temperature and obtain joint coating on pipeline watertightness antiseptic hot melt glue.
Embodiment 2
(1) by the hot melt adhesive finished product of 100 kilograms, prepare, take: 25%EVA resin, 30% novolac resin, 11% polyisobutene, 25% paraffin, 7% composite assistant, 2% antioxidant 1076; Novolac resin, composite assistant and paraffin are joined in Banbury mixer, and lead to N in Banbury mixer
2, N
2the time that passes into be 20 minutes; Pass into N herein
2object be to guarantee that reaction carries out under inert conditions.
(2) pass into N
2after end, start heat temperature raising, when novolac resin starts to melt, toughner is put in Banbury mixer, when temperature is increased to 160 ℃, start to stir, and start to add gradually EVA resin, until after all EVA raw materials all add, add gradually the process of EVA approximately to continue 1 hour, continue heating 15 minutes, each component is fully mixed;
(3) mixture fully mixing in step (2) is cooled to 130 ℃, mixture is poured out to Banbury mixer, continue to be cooled to room temperature and obtain joint coating on pipeline watertightness antiseptic hot melt glue.
Embodiment 3
(1) by the hot melt adhesive finished product of 100 kilograms, prepare, take: 45%EVA resin, 15% novolac resin, 5% diphenylmethanediisocyanate, 35% paraffin, 4% composite assistant, 1% irgasfos 168; Novolac resin, composite assistant and paraffin are joined in Banbury mixer, and lead to N in Banbury mixer
2, N
2the time that passes into be 20 minutes; Pass into N herein
2object be to guarantee that reaction carries out under inert conditions.
(2) pass into N
2after end, start heat temperature raising, when novolac resin starts to melt, toughner is put in Banbury mixer, when temperature is increased to 170 ℃, start to stir, and start to add gradually EVA resin, until after all EVA raw materials all add, add gradually the process of EVA approximately to continue 1 hour, continue heating 10 minutes, each component is fully mixed;
(3) mixture fully mixing in step (2) is cooled to 130 ℃, mixture is poured out to Banbury mixer, continue to be cooled to room temperature and obtain joint coating on pipeline watertightness antiseptic hot melt glue.
Comparative example
(1) by the hot melt adhesive finished product of 100 kilograms, prepare, take: 35%EVA resin (the VA content of EVA resin is 28%, and melt index MI is 150g/10min), 20% Gum Rosin, 10% polyisobutene, 30% paraffin, 3% composite assistant, 2% antioxidant 1010; Novolac resin, composite assistant and paraffin are joined in Banbury mixer, and lead to N in Banbury mixer
2, N
2the time that passes into be 20 minutes; Pass into N herein
2object be to guarantee that reaction carries out under inert conditions.
(2) pass into N
2after end, start heat temperature raising, when novolac resin starts to melt, toughner is put in Banbury mixer, when temperature is increased to 165 ℃, start to stir, and start to add gradually EVA resin, until after all EVA raw materials all add, add gradually the process of EVA approximately to continue 1 hour, continue heating 15 minutes, each component is fully mixed;
(3) mixture fully mixing in step (2) is cooled to 130 ℃, mixture is poured out to Banbury mixer, continue to be cooled to room temperature and obtain joint coating on pipeline watertightness antiseptic hot melt glue.
EVA resin in the embodiment of the present invention is ethylene-vinyl acetate copolymer, its molecular structure comprises vinyl acetate between to for plastic group (VA) and the nonpolar ethylene moiety with high polarity, therefore EVA has good cohesive action to polar material and non-polar material, wherein in EVA resin, the content of VA and melt index MI have considerable influence to the performance of hot melt adhesive, therefore, the VA content of selecting EVA in formula of the present invention is 28%, the melt index MI of EVA is 150g/10min, and be 28% by lot of experiment validation VA content as EVA in formula of the present invention, when the melt index MI of EVA is 150g/10min, the over-all properties of hot melt adhesive is better.
The raw material relating in the embodiment of the present invention and comparative example: (the VA content of EVA resin is 28% to EVA resin, melt index MI is 150g/10min), novolac resin, Gum Rosin, polyisobutene, paraffin, composite assistant, antioxidant 1010, antioxidant 1076 and irgasfos 168 are all common industrial raw materials in industry, the instrument relating in preparation process is also common in industry, there is no particular restriction.
Performance test
Hot melt adhesive prepared by embodiment 1-3 and comparative example carries out performance test, and its test result is as shown in table 1.Wherein, shearing resistance adopts omnipotent test machine for mechanism to measure, and examination criteria is GB/T7124-2008, measures respectively the shearing resistance at 23 ℃ and 80 ℃.By hot-melt of the present invention on steel plate, hot melt adhesive is put into respectively 10% hydrochloric acid, sodium hydroxide and salt solution after solidifying, soak completely after 168 hours and take out, by the clean room temperature of distilled water flushing, dry, then carry out shearing resistance test with omnipotent test machine for mechanism; And contrast with the sample that does not carry out corrosion treatment.The instrument of the stripping strength of test hot melt adhesive is conventional multifunction electronic trier, and its examination criteria is GB/T2792-1998.
The ring and ball softening point of hot melt adhesive utilizes softening point apparatus to detect, and its examination criteria is GB/T4507-1999.Ring and ball softening point is an important parameter of hot melt adhesive, and ring and ball softening point is higher, and the resistance to elevated temperatures of hot melt adhesive is better, but its processing temperature is higher; Ring and ball softening point is lower, and the processing temperature of hot melt adhesive is lower, easy to use, but resistance to elevated temperatures is undesirable.
As shown in the result of table 1,90～94 ℃ of the ring and ball softening points of the watertightness antiseptic hot melt glue making in the embodiment of the present invention, stripping strength is 105～120N/cm, shearing resistance is 1.45～1.54MPa, the cohesive strength that hot melt adhesive prepared by the present invention is described is high, water-proof sealing is good, and its performance is better than hot melt adhesive prepared by comparative example.Wherein, the over-all properties of embodiment 1 is best, and therefore, embodiment 1 is most preferred embodiment of the present invention.After the processing of peracid, alkali and salt, the shearing resistance of the hot melt adhesive in embodiment of the present invention 1-3 and untreated before shearing resistance contrast, the variable quantity of shearing resistance is little, illustrates that the watertightness antiseptic power of this hot melt adhesive is stronger; And hot melt adhesive in comparative example is after the processing of acid, alkali and salt, shearing resistance compares when untreated, and its change of sheer strength amount is larger, illustrates that the watertight antiseptic power of hot melt adhesive of comparative example is poor.
Comparative example is the contrast of most preferred embodiment 1 of the present invention, and the tackifier novolac resin in embodiment 1 is replaced with to traditional tackifier Gum Rosin, and remaining recipe ingredient is all constant, and processing conditions is constant.The watertightness antiseptic power of the hot melt adhesive of preparing in comparative example is obviously not as the hot melt adhesive in embodiment 1.This be because, on the one hand avoided Gum Rosin to there is acid attack effect to pipeline, in formula, adding Gum Rosin itself just has certain corrosive nature to pipeline; Novolac resin has improved the antiseptic property of hot melt adhesive greatly on the other hand, has effectively improved the adhesive property of hot melt adhesive.
Joint coating on pipeline watertightness antiseptic hot melt glue provided by the invention, that a kind of EVA of usining resin is as matrix resin and added the High-efficient Water seal hot melting glue that novolac resin is prepared into as tackifier, the waterproof sealing of this hot melt adhesive is better, cohesive strength is high, resistance to chemical corrosion is good, can be good at meeting the requirement for anticorrosion of the joint coating on pipeline of long period of soaking in seawater.
The above; be only the specific embodiment of the present invention, protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Table 1 the performance test results
Claims (7)
1. a joint coating on pipeline watertightness antiseptic hot melt glue, is characterized in that, by mass percentage, its formula comprises:
EVA resin: 25～45%, tackifier: 15～30%, toughner: 1～20%, paraffin: 25～35%, composite assistant: 1～7%, oxidation inhibitor: 0.5～2%; Wherein, the VA content of described EVA resin is 28%, and the melt index MI of described EVA resin is 150g/10min; Described tackifier are novolac resin.
2. joint coating on pipeline watertightness antiseptic hot melt glue according to claim 1, is characterized in that, by mass percentage, its formula comprises: EVA resin: 35%, and tackifier: 20%, toughner: 10%, paraffin: 30%, composite assistant 3%, oxidation inhibitor: 2%; Wherein, the VA content of described EVA resin is 28%, and the melt index MI of described EVA resin is 150g/10min; Described tackifier are novolac resin.
3. joint coating on pipeline watertightness antiseptic hot melt glue according to claim 2, is characterized in that, toughner is polyisobutene or diphenylmethanediisocyanate.
4. joint coating on pipeline watertightness antiseptic hot melt glue according to claim 2, is characterized in that, described composite assistant is to be the compound that catalytic material polymerization is made by the by product C5 fraction of ethylene production and C 9 fraction.
5. joint coating on pipeline watertightness antiseptic hot melt glue according to claim 2, is characterized in that, described oxidation inhibitor is one or more mixtures in antioxidant 1010, antioxidant 1076 and irgasfos 168.
6. for the preparation of a method for the joint coating on pipeline watertightness antiseptic hot melt glue described in claim 1-5, it is characterized in that, comprise the following steps:
(1) according to each component in formula, take raw material, novolac resin, composite assistant and paraffin are joined in Banbury mixer, and lead to N in Banbury mixer
2, N
2the time that passes into be 20 minutes;
(2) pass into N
2after end, start heat temperature raising, when novolac resin starts to melt, toughner is put in Banbury mixer, when temperature is increased to 160～170 ℃, started to stir, and start to add gradually EVA resin, until after all EVA raw materials all add, continue heating 10～15 minutes, each component is fully mixed;
(3) mixture fully mixing in step (2) is cooled to 130 ℃, mixture is poured out to Banbury mixer, continue to be cooled to room temperature and obtain joint coating on pipeline watertightness antiseptic hot melt glue.
7. the method for the preparation of joint coating on pipeline watertightness antiseptic hot melt glue according to claim 6, is characterized in that, this process of EVA resin that adds gradually described in step (2) continues 1 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310517421.7A CN103602289A (en) | 2013-10-28 | 2013-10-28 | Pipeline joint watertightness anticorrosion hot melt adhesive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310517421.7A CN103602289A (en) | 2013-10-28 | 2013-10-28 | Pipeline joint watertightness anticorrosion hot melt adhesive |
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| CN103602289A true CN103602289A (en) | 2014-02-26 |
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|---|---|---|---|
| CN201310517421.7A Pending CN103602289A (en) | 2013-10-28 | 2013-10-28 | Pipeline joint watertightness anticorrosion hot melt adhesive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105778827A (en) * | 2016-04-14 | 2016-07-20 | 上海政太纳米科技股份有限公司 | EVA hot melt adhesive for storage battery |
| CN112266756A (en) * | 2020-11-03 | 2021-01-26 | 杭州三联油墨化学有限公司 | Hot melt adhesive for radiographic inspection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653665A (en) * | 2012-04-28 | 2012-09-05 | 成都鑫三洋科技发展有限公司 | Hot melt adhesive |
-
2013
- 2013-10-28 CN CN201310517421.7A patent/CN103602289A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653665A (en) * | 2012-04-28 | 2012-09-05 | 成都鑫三洋科技发展有限公司 | Hot melt adhesive |
Non-Patent Citations (1)
| Title |
|---|
| 张能等: "高效水密封防腐绝缘热熔胶的研究", 《化学工程师》, no. 9, 31 December 2009 (2009-12-31), pages 14 - 16 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105778827A (en) * | 2016-04-14 | 2016-07-20 | 上海政太纳米科技股份有限公司 | EVA hot melt adhesive for storage battery |
| CN105778827B (en) * | 2016-04-14 | 2017-07-11 | 上海政太纳米科技股份有限公司 | Battery EVA hot-melt adhesive |
| CN112266756A (en) * | 2020-11-03 | 2021-01-26 | 杭州三联油墨化学有限公司 | Hot melt adhesive for radiographic inspection |
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Application publication date: 20140226 |