EP3625301A1 - Chloropren-klebstoff-system - Google Patents
Chloropren-klebstoff-systemInfo
- Publication number
- EP3625301A1 EP3625301A1 EP18725510.4A EP18725510A EP3625301A1 EP 3625301 A1 EP3625301 A1 EP 3625301A1 EP 18725510 A EP18725510 A EP 18725510A EP 3625301 A1 EP3625301 A1 EP 3625301A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- component
- chloroprene
- adhesive system
- adhesive
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J111/00—Adhesives based on homopolymers or copolymers of chloroprene
Definitions
- the invention relates to a chloroprene adhesive system which ensures improved stability over conventional multi-component adhesives even at high temperatures.
- the object of the invention is therefore to enable an adhesive bond, which has improved stability especially in the high temperature range, ie heat resistance, and completely dispenses with the use of isocyanates. For the end user a simple and secure application should be possible.
- Such a chloroprene adhesive system comprises a first component (A) which contains an unsaturated elastomer, in particular chloroprene rubber, and an additive, in particular a metal oxide, and preferably zinc oxide in the range of 10 ⁇ phr ⁇ 40.
- the chloroprene adhesive system may contain a second component (B). This may be a halogenated reactive hardener resin, and preferably a brominated reactive hardener resin.
- the stoichiometric ratio of the first component (A) to the second component (B) may be 100/15 to 100/1, preferably 100/10 to 100/4.
- a usable chloroprene adhesive system After mixing the first component (A) and the second component (B), a usable chloroprene adhesive system is formed, which may have a pot life of several days to weeks at room temperature. Thus, the pot life - and therefore the applicability - of the chloroprene adhesive system is much longer than the conventional multi-component adhesives after mixing.
- the finished adhesive bond has increased stability over conventional multi-component adhesives. Adhesive strength on high energy or polarizable surfaces, such as metal surfaces, is also improved by the chloroprene adhesive system over conventional multicomponent adhesives.
- the elements of the first component (A) may first be mixed and then dissolved, the concentration of a first solution being from 20 to 28% by weight, with a particularly preferred concentration of from 22 to 26% by weight, with an appropriate viscosity for the application Solid job and a particularly high strength to achieve.
- the dissolution of the first component (A) can be carried out independently of the second component (B).
- the elements of the second component (B) may first be mixed and then dissolved, the concentration of a second solution being 30 to 60% by weight, with a particularly preferred concentration of 35 to 50% by weight. This serves to achieve the highest possible strength and heat resistance of the chloroprene adhesive system.
- a cyclohexane-ethyl acetate solution for dissolving the first component (A) and the second component (B), in each case a cyclohexane-ethyl acetate solution can be used, which may particularly preferably have a weight ratio of about 1: 1.
- the cyclohexane-ethyl acetate solution does not participate in the other relevant reactions of the chloroprene adhesive system.
- the two dissolved components of the chloroprene adhesive system can be mixed at a temperature between 10 ° C and 40 ° C. This generally facilitates the applicability and the range of use of the chloroprene adhesive system.
- the chloroprene adhesive system may have a dynamic viscosity of 500-5,000 mPa ⁇ s (millipascal seconds) at 20 ° C, preferably it may have a dynamic viscosity of 1,500-3,000 mPa ⁇ s. It can be optimally applied to the surfaces to be treated.
- the chloroprene adhesive system can automatically induce a reaction that may require additional curing.
- a reaction that may require additional curing.
- This temperature increase can also be done after bonding in operation; for example with a strong one Solar radiation exposed conveyor belt or a component in the waste heat of an engine.
- the additional curing in particular also increases the heat resistance of the adhesive bond.
- the additional curing can be deliberate and targeted by heating by means of an infrared radiator or other temperature source at 80 ° C to 120 ° C for 40 min to 80 min, preferably at 100 ° C for about 60 min.
- the improved heat resistance can be guaranteed.
- the first component (A) or the second component (B) may contain an additive, in particular a dye or an antioxidant.
- an additive in particular a dye or an antioxidant.
- a dye By means of a dye, the mixture of the two dissolved components of the chloroprene adhesive system can be tested for their homogeneity.
- a dye also allows the clear identification of repaired areas.
- the chloroprene adhesive system comprises a first component (A) which contains inter alia an unsaturated elastomer, in particular chloroprene rubber.
- a blend of chloroprene rubber with other unsaturated rubber blends or blends of other unsaturated rubber blends may also be included.
- the first component (A) comprises an additive, in particular a metal oxide and preferably zinc oxide in the range of 10 ⁇ phr ⁇ 40. More preferably, the first component (A) comprises the zinc oxide in the range of 20 ⁇ phr ⁇ 35, as described herein its property as an acid scavenger and crosslinking aid optimally comes to light.
- the chloroprene adhesive system contains a second component (B), namely a halogenated reactive hardener resin and preferably a brominated reactive hardener resin containing, inter alia, the
- the stoichiometric ratio of the first component (A) to the second component (B) is 100/15 to 100/1, preferably 100/10 to 100/4, in order, in particular, to achieve optimum heat resistance of the chloroprene adhesive system.
- Figure 1 compares the chloroprene adhesive system (C-K-S) with a commercially available reference two-component adhesive (Ref-K) with application of the adhesive to a temperature of 120 ° C for several days. It is the peel resistance measured after at least one day exposure to the bond at a temperature of 120 ° C both in the hot state and after a further one-day cooling phase to room temperature.
- a rubber-metal bond was evaluated.
- the rubber layer may be, for example, a chloroprene-containing layer which is a semi-prevulcanized layer.
- a commercially available primer for the pretreatment of metal surfaces in soft rubbers can be used.
- the peel resistance of the bond is normalized to 100% using the commercially available reference two-component adhesive.
- the bonding was first carried out by thin application of the mixed reference two-component adhesive (Ref-K) and subsequent short-term strong pressing, then the workpiece was heat-treated for one day at a temperature of 120 ° C and then for another Day cooled to room temperature. All other values in Figure 1 refer to this reference peel resistance of 100%.
- the sequence of the peeling resistance detection as a function of the duration of the temperature application will be described. First, the glued workpieces (the adhesive bonds) are stored for one day at a temperature of 120 ° C.
- Diagram data for one day the peel resistance values of the reference two-component adhesive (Ref-K) and of the chloroprene adhesive system (CKS) determined with increased temperature exposure are determined directly in Following this one-day storage at a temperature of 120 ° C.
- the peel resistance values of the reference two-component adhesive (Ref-K) and the chloroprene adhesive system (CKS) determined at room temperature are determined after a further one-day cooling phase following one-day storage at a temperature of 120 ° C.
- Diagram data for three days the peel resistance values of the Reference Two-Component Adhesive (Ref-K) and the Chloroprene Adhesive System (C-K-S) determined at elevated temperature are carried out immediately after this three-day storage at a temperature of 120 ° C.
- Diagram data for seven days the peel resistance values of the Reference Two-Component Adhesive (Ref-K) and the Chloroprene Adhesive System (C-K-S) determined at elevated temperature are applied immediately after this seven-day storage at a temperature of 120 ° C.
- the peel resistance values of the reference two-component adhesive (Ref-K) and the chloroprene adhesive system (C-K-S) determined at room temperature are determined after a further one-day cooling phase following storage at a temperature of 120 ° C. for seven days.
- Diagram information for fourteen days the peel resistance values of the Reference Two-Component Adhesive (Ref-K) and the Chloroprene Adhesive System (CKS), determined at elevated temperature, are taken immediately after this fortnightly storage at a temperature of 120 ° C.
- An advantage of the chloroprene adhesive system is that its pot life far exceeds that of a commercially available reference two-component adhesive. After mixing the first component (A) with the second component (B), the chloroprene adhesive system can be kept ready for use for well over a week, without any adverse effect on the adhesive bond to be created.
- the initial bond strength of the chloroprene adhesive system at room temperature is equivalent to the initial bond strength of the reference two-part adhesive (not shown in Figure 1).
- the curing takes place here by the crystallization of chloroprene.
- the second component (B) is activated at increasing temperatures, so that in addition chemical crosslinking by the hardener resin takes place.
- the polar chloroprene adhesive system generally has advantages of the strength of the adhesive bond on high-energy or polarizable surfaces, such as metal surfaces.
- the peel resistance value of the chloroprene adhesive system (CKS 120 ° C) determined immediately after the one-day storage of the bonded workpiece at a temperature of 120 ° C is significantly above 60% over the peel resistance value determined when glued using the reference two-component adhesive (Ref-K 120 ° C). This is due to the fact that with an increase in temperature of the adhesive bond produced by the chloroprene adhesive system to at least a temperature of 60 ° C automatically takes place an additional chemical crosslinking, which is essential - which in turn is important for determining the Schlwiderstandshong at room temperature - is not reversible.
- the crosslinking takes place on double bonds (of the unsaturated elastomer, preferably of the chloroprene rubber) via methylol / bromomethyl groups (des halogenated reactive hardener resin).
- the fact that the peel resistance values are below the reference of 100% with temperature exposure of 120 ° C. (Ref-K RT) is due to the predominantly reversible softening of the chloroprene crystal composite with increasing temperature; with cooling then the crystallization of chloroprene occurs again.
- the metal oxide promotes activation of the halogenated reactive curing resin and thus fulfills a beneficial dual function, as it also promotes cross-linking between the chloroprene rubber molecules.
- the chloroprene adhesive system By means of the chloroprene adhesive system, a significant increase in the temperature stability can be achieved because the chemical crosslinking due to the halogenated reactive hardener resin counteracts the softening of the chloroprene crystal composite with increasing temperature.
- a further advantage is that compared with normal phenolic resins, the halogenated reactive curing agent used shows a significantly higher crosslinking rate with chloroprenes. Compared to isocyanates, the advantageous omission of a pot life limiting the processing window can be cited.
- the stirred chloroprene adhesive system can be processed over several days to weeks, since the crosslinking essentially only starts at higher temperatures. The thus crosslinked rubber has a significantly higher softening temperature.
- peel resistance values of the reference two-component adhesive (Ref-K RT) - 100% - and of the chloroprene adhesive system (CKS RT) determined at room temperature after a further one-day cooling phase following the one-day storage at a temperature of 120 0 C have a more than 60% higher peel resistance value of the chloroprene adhesive system (compared to the two-component adhesive).
- CKS RT chloroprene adhesive system
- Peel resistance values also show a significantly higher peel resistance of the adhesive bond by means of the chloroprene adhesive system (C-K-S 120 ° C.) compared to the adhesive bond by means of the reference two-component
- Adhesive (Ref-K 120 ° C), and the same applies to at room temperature determined peel resistance values of the reference two-component adhesive (Ref-K RT) and the chloroprene adhesive system (CKS RT), which were determined after another one-day cooling phase following storage for seven days at a temperature of 120 ° C.
- the superiority of the chloroprene adhesive system is particularly evident in the fact that the peel resistance of the adhesive bond by means of the chloroprene adhesive system after fourteen days temperature exposure of 120 ° C and after a subsequent one-day cooling phase to room temperature over the adhesive bond by means of the reference two Component adhesive that has only been exposed to 120 ° C for one day and then cooled to room temperature over a day, exceeding 25%.
- the peel resistance of the adhesive bond by means of the chloroprene adhesive system exceeds the adhesive bond by means of the reference two-component adhesive and can at the same time completely dispense with the use of isocyanates.
- Figure 2 compares the chloroprene adhesive system (CKS) with a commercially available reference two-component adhesive (Ref-K), which may be applied to the adhesive at a temperature of several days 120 ° C for the reference two-component adhesive (Ref-K) and a correspondingly long application of the bond with a temperature of 140 ° C for the chloroprene adhesive system (CKS). All peel resistance values of the reference two-component adhesive of Figure 2 are therefore identical to those of Figure 1.
- Ref-K commercially available reference two-component adhesive
- the duration of the temperature application in Figure 2 and Figure 1 is analogous.
- the seven-day graphs are therefore obtained, for example, from peel tests immediately following a seven-day storage at a temperature of 120 ° C for the reference two-component adhesive (Ref-K 120 ° C) and immediately following a seven-day storage at a temperature of 140 ° C for the chloroprene adhesive system (CKS 140 ° C) were driven.
- the peel resistance values of the reference two-component adhesive (Ref-K RT) and the chloroprene adhesive system (CKS RT) determined at room temperature are again measured after a further one-day cooling phase following storage at a temperature of 120 ° C. for seven days for the reference two-component adhesive and following a seven-day storage at a temperature of 140 ° C for the chloroprene adhesive system.
- the temperature-induced additional chemical crosslinking by the halogenated reactive curing resin exceeds in its ability to counteract the temperature-induced softening of the chloroprene crystal composite, the reference Two-component adhesive (Ref-K) after just a few days.
- the adhesive bond of the chloroprene adhesive system despite seven days exposure to a temperature of 140 ° C over 10% higher peel resistance than the adhesive bond by means of the reference two-component adhesive with seven days exposure to 120 ° C.
- the adhesive bond of the chloroprene adhesive system (CKS 140 ° C) even over 40% higher peel resistance than the adhesive bond by means of the reference two-component adhesive (Ref-K 120 ° C) at a temperature of 120 ° C for fourteen days. That is, as the duration of the exposure to the temperature increases, the chloroprene adhesive system is more and more superior to the reference two-component adhesive and more capable of counteracting the thermal stress of material.
- the heating is only necessary if the initial bond strength of the chloroprene adhesive system, which corresponds at room temperature to the initial bond strength of the reference two-component adhesive, is exceeded got to.
- the heating of the bond can advantageously and deliberately done, but it can be used in many applications, the automatic heating during operation.
- the cost of a repair can be significantly reduced, since due to the high initial strength of the adhesive bond using the chloroprene adhesive system can be dispensed with longer life.
- the system can be restarted very shortly after making the adhesive bond and the adhesive bond reaches a further increased strength during operation.
- the bonding by means of Chloroprene adhesive system has a higher heat resistance than a bond using the reference two-component adhesive at the same temperature.
- this additional strength arises through an automatic additional crosslinking.
- This additional crosslinking which also very much serves safety because it counteracts a dangerous softening of the chloroprene with increasing temperature, is therefore an advantageous inherent property of the chloroprene adhesive system of the invention.
- the elements of the first component (A) may advantageously be first mixed and then dissolved, the concentration of a first solution being from 20 to 28% by weight, with a particularly preferred concentration of from 22 to 26% by weight, with a suitable viscosity for a suitable solid order and particularly high strength to achieve. Although it requires the high heat resistance of the. Chloroprene adhesive system, the subsequent mixing with the second component (B), then the release of the first component (A) takes place independently of the second component (B). Therefore, it is possible to produce, fill or store the first component (A) entirely separately from the second component (B), which results in cost and logistical advantages.
- the elements of the second component (B) may advantageously be first mixed and then dissolved, the concentration of a second solution being 30 to 60% by weight, with a particularly preferred concentration of 35 to 50% by weight. This also serves to achieve the highest possible strength and heat resistance of an adhesive bond produced using the chloroprene adhesive system. It is again advantageous that Production, filling and, for example, packaging of the second component (B) can be carried out completely independently of the first component (A). The production of both components can take place simultaneously, for example at one or more locations, but it is also possible to produce, for example, the second component (B) first at one site and then the first component (A).
- a cyclohexane-ethyl acetate solution for dissolving the first component (A) and the second component (B), in each case a cyclohexane-ethyl acetate solution can be used, which particularly preferably has a weight ratio of 1: 1. Due to the low density differences between cyclohexane and ethyl acetate, a volume ratio of 1: 1 is possible.
- the cyclohexane-ethyl acetate solution can be used both for dissolving the first component (A) and the second component (B).
- the cyclohexane-ethyl acetate solution does not participate in the other relevant reactions of the chloroprene adhesive system. On harmful toluene can be dispensed with entirely.
- the two dissolved components of the chloroprene adhesive system may advantageously be mixed at a temperature between 10 ° C and 40 ° C. This generally facilitates the applicability and range of use of the chloroprene adhesive system.
- the mixing does not entail any evolution of heat and can therefore be carried out in virtually any amount by simple stirring until after a short time a homogeneous mixing of the first component (A) and the second component (B) has taken place.
- a mixer or in a stirrer Even a fully automatic mixing is conceivable.
- the extremely long pot life of the blended chloroprene adhesive system promotes repeated production of larger quantities.
- the chloroprene adhesive system may advantageously have a dynamic viscosity of 500-5,000 mPa ⁇ s (millipascal seconds) at 20 ° C, preferably it has a dynamic viscosity of 1,500-3,000 mPa ⁇ s on. This allows it to be optimally applied to the surfaces to be treated, and the use of a variety of brushes, rollers and rollers for applying is possible. You can do without expensive special tools.
- the chloroprene adhesive system can automatically induce a reaction that may cause additional curing.
- a reaction that may cause additional curing.
- a non-reversible crosslinking of the chloroprene can take place.
- This additional curing increases in particular the heat resistance of the adhesive bond.
- the increased resistance to mechanical stress even after cooling, is maintained compared to the adhesive bond exposed to no increase in temperature.
- the increase in temperature of the adhesive bond produced by means of the chloroprene adhesive system can also - especially due to the achievable high initial strength '- take place during operation of the repaired component; For example, in a strong sun-exposed conveyor belt or a component in the waste heat of an engine. Long and costly downtime can thus be avoided.
- the additional curing of the adhesive bond produced by means of the chloroprene adhesive system intentionally and deliberately by heating at 80 ° C to 120 ° C for 40 min to 80 min, preferably at 100 ° C for about 60 min.
- an infrared radiator or other suitable temperature source can be used.
- the improved heat resistance of the adhesive bond produced by means of the chloroprene adhesive system can thus be deliberately brought about and thus the increased resistance can be guaranteed.
- suitable temperature profiles can also be run, which cause an increase in the resistance of the adhesive bond produced by means of the chloroprene adhesive system.
- the additional curing of the adhesive bond produced by means of the chloroprene adhesive system can also be carried out in an autoclave at 98 ° C and 6 bar pressure for 3.5 h.
- the targeted adaptation of pressure and temperature over a certain period of time thus guarantees improved heat resistance of the adhesive bond produced by means of the chloroprene adhesive system.
- certain pressure and / or temperature profiles are driven in the autoclave, by means of which the mechanical resistance of the adhesive bond produced by means of the chloroprene adhesive system is further increased.
- the advantageous addition of a dye causes on the one hand a simple visual inspection of the homogeneity of the mixed first component (A) with the second component (B) and a clear identification of a repaired site. Furthermore, this clearly indicates the size of the repair. Also with conveyor belts such a marking is very useful. Addition of an antioxidant in the first component (A) or the second component (B) serves to provide the corresponding improvement.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017208338.7A DE102017208338A1 (de) | 2017-05-17 | 2017-05-17 | Chloropren-Klebstoff-System |
PCT/EP2018/062946 WO2018211019A1 (de) | 2017-05-17 | 2018-05-17 | Chloropren-klebstoff-system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3625301A1 true EP3625301A1 (de) | 2020-03-25 |
Family
ID=62196594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18725510.4A Withdrawn EP3625301A1 (de) | 2017-05-17 | 2018-05-17 | Chloropren-klebstoff-system |
Country Status (9)
Country | Link |
---|---|
US (1) | US20200148921A1 (de) |
EP (1) | EP3625301A1 (de) |
CN (1) | CN110997850A (de) |
AU (1) | AU2018269679A1 (de) |
CA (1) | CA3063639A1 (de) |
CL (1) | CL2019003261A1 (de) |
DE (1) | DE102017208338A1 (de) |
WO (1) | WO2018211019A1 (de) |
ZA (1) | ZA201908323B (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124548A (en) * | 1964-03-10 | Neoprene-epoxy-phenol- aldehyde | ||
AU3145867A (en) * | 1967-12-20 | 1969-06-26 | Norton Australia Pty. Ltd | Adhesive composition |
JP3435250B2 (ja) * | 1995-03-20 | 2003-08-11 | コニシ株式会社 | 接着剤組成物 |
CN101263170A (zh) * | 2005-07-08 | 2008-09-10 | 东曹株式会社 | 氯丁二烯类嵌段共聚物和无皂聚氯丁二烯类胶乳、以及它们的制造方法 |
SG11201605111YA (en) * | 2013-12-23 | 2016-07-28 | Arlanxeo Singapore Pte Ltd | Rubbers with tunable levels of metal containing anti-agglomerants |
-
2017
- 2017-05-17 DE DE102017208338.7A patent/DE102017208338A1/de not_active Withdrawn
-
2018
- 2018-05-17 EP EP18725510.4A patent/EP3625301A1/de not_active Withdrawn
- 2018-05-17 US US16/614,334 patent/US20200148921A1/en not_active Abandoned
- 2018-05-17 CA CA3063639A patent/CA3063639A1/en not_active Abandoned
- 2018-05-17 WO PCT/EP2018/062946 patent/WO2018211019A1/de active Application Filing
- 2018-05-17 CN CN201880032547.6A patent/CN110997850A/zh active Pending
- 2018-05-17 AU AU2018269679A patent/AU2018269679A1/en not_active Abandoned
-
2019
- 2019-11-14 CL CL2019003261A patent/CL2019003261A1/es unknown
- 2019-12-12 ZA ZA2019/08323A patent/ZA201908323B/en unknown
Also Published As
Publication number | Publication date |
---|---|
CA3063639A1 (en) | 2019-12-06 |
CL2019003261A1 (es) | 2020-03-27 |
CN110997850A (zh) | 2020-04-10 |
WO2018211019A1 (de) | 2018-11-22 |
AU2018269679A1 (en) | 2019-12-05 |
US20200148921A1 (en) | 2020-05-14 |
ZA201908323B (en) | 2021-04-28 |
DE102017208338A1 (de) | 2018-11-22 |
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