MIXTURE COMPRISING AN ADHESIVE AND A WAX-BASED FILLER

Abstract

The present invention relates to a mixture comprising an adhesive and a wax-based filler which is in the form of fibers and/or fiber bundles that form one or more volume structures with one another, to a method for preparing a mixture of this type and to the use thereof in vehicle construction. The present invention further relates to the use of a wax-based filler, in which the wax is present in the form of fibers and/or fiber bundles which form one or more volume structures with one another, as an adsorbent in adhesives.

Claims

1. A mixture comprising an adhesive and a wax-based filler, wherein the wax is present in the form of fibers and/or fiber bundles which form one or more volume structures with one another.

2. The mixture according to claim 1, wherein the wax-based filler is a filler for hydrophobic substances.

3. The mixture according to claim 1, wherein the wax is selected from the group consisting of natural and synthetic waxes.

4. The mixture according to claim 3, wherein the wax is selected from the group consisting of polyethylene wax, polypropylene wax, polyethylene-polypropylene copolymer wax and mixtures thereof

5. The mixture according to claim 3, wherein the wax is selected from the group consisting of montan wax, carnauba wax, beeswax and candelilla wax.

6. The mixture according to claim 1, wherein the wax has a number-average molecular weight of not more than 15,000 g/mol, determined by means of GPC.

7. The mixture according to claim 1, wherein the fibers are produced by means of a melt spinning process and subsequent atomization.

8. The mixture according to claim 1, wherein the filler is present in an amount of 0.1 to 30 wt. %, in each case based on total weight of the mixture.

9. The mixture according to claim 1, wherein the adhesive is selected from the group consisting of rubber adhesives, polyurethane adhesives, acrylate adhesives, epoxy adhesives, adhesives based on EVA (ethylene vinyl acetate) polymers and adhesives based on silane-modified polymers.

10. A method for preparing a mixture according to claim 1, comprising steps of: providing an adhesive; providing a wax-based filler, wherein the wax is in the form of fibers and/or fiber bundles that form one or more volume structures with one another; and mixing the adhesive and the filler.

11. An adhesive composition comprising an adsorbent for hydrophobic substances, wherein the adsorbent is comprised of a wax-based filler, the wax being in the form of wax fibers and/or wax fiber bundles which form one or more volume structures with one another.

Description

EXAMPLES

[0024] A mixture according to the invention was prepared by mixing together solid rubber, polybutadiene, calcium carbonate and a suitable wax-based filler.

[0025] Suitable wax-based fillers are described, for example, in the publication EP 2 392 630, to which reference is expressly made here, and are commercially available under the trade name Deurex PURE from Deurex AG, Germany.

[0026] Moisture resistance and corrosion resistance were tested under different conditions using the following substrates: [0027] EGS: electrogalvanized steel outer shell (e.g. DX54D+ZE75/75, thickness ≥0.8 mm) [0028] HDG: hot-dip galvanized steel outer shell (e.g. DX54D+Z100, thickness ≥0.8 mm) [0029] ALU: aluminum (e.g. A16-OUT Surfalex, thickness ≥0.8 mm)

[0030] The bond between the substrates was tested after the specified time in each case: [0031] ++: very good [0032] +: good [0033] o: satisfactory

[0034] “RH*” in the examples represents Relative Humidity

Edging Fold Adhesives

[0035]

TABLE-US-00001 TABLE 1 Substrate: EGS/HDG mixed bonding Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ ++ ++ ++ ++ ++ ++ ++ + + curing After 15 min at ++ ++ ++ ++ ++ ++ + + ∘ ∘ 160° C. After CDC ++ ++ ++ ++ ++ + + ∘ ∘ ∘ furnace (without pre-curing)

TABLE-US-00002 TABLE 2 Substrate: ALU/ALU Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ ++ ++ ++ ++ ++ ++ ++ + + curing After 15 min at ++ ++ ++ ++ ++ ++ ++ ++ ∘ ∘ 160° C. After CDC ++ ++ ++ ++ ++ ++ + + ∘ ∘ furnace (without pre-curing)

Relining Adhesives

[0036]

TABLE-US-00003 TABLE 3 Substrate: EGS/HDG mixed bonding Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ curing After 15 min at ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ 160° C. After CDC ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ furnace (without pre-curing)

TABLE-US-00004 TABLE 4 Substrate: ALU/ALU Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ curing After 15 min at ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ 160° C. After CDC ++ ++ ++ ++ ++ ++ ++ ++ ++ ++ furnace (without pre-curing) *: relative humidity

[0037] As can be seen from the data summarized in tables 1 to 4, the mixture according to the invention has excellent moisture resistance and still displays outstanding composite properties after 5 weeks even under storage conditions of 40° C. and 100% relative humidity.

[0038] As a comparison, the results of the same mixture without a wax-based filler are shown below in Tables 5-8:

Edging Fold Adhesives

[0039]

TABLE-US-00005 TABLE 5 Substrate: EGS/HDG mixed bonding Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ + ∘ − − ++ + ∘ − − curing After 15 min at ++ + ∘ − − + ∘ − − − 160° C. After CDC + ∘ − − − ∘ − − − − furnace (without pre-curing)

TABLE-US-00006 TABLE 6 Substrate: ALU/ALU Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ + ∘ − − ++ + ∘ − − curing After 15 min at ++ + ∘ − − + ∘ − − − 160° C. After CDC + ∘ − − − ∘ − − − − furnace (without pre-curing)

Relining Adhesives

[0040]

TABLE-US-00007 TABLE 7 Substrate: EGS/HDG mixed bonding Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ ++ + ∘ − ++ + ∘ ∘ − curing After 15 min at ++ + + ∘ − + ∘ − − − 160° C. After CDC + + ∘ − − + ∘ − − − furnace (without pre-curing)

TABLE-US-00008 TABLE 8 Substrate: ALU/ALU Storage condition 23° C./80% RH* 40° C./100% RH* Storage duration (week) 1 2 3 4 5 1 2 3 4 5 Without pre- ++ ++ + ∘ − ++ + ∘ ∘ − curing After 15 min at ++ + + ∘ − + ∘ − − − 160° C. After CDC + + ∘ − − + ∘ − − − furnace (without pre-curing)

[0041] As can be seen from the comparison of the data from tables 1 to 4 with those from tables 5 to 8, the mixture according to the invention has a significantly improved moisture resistance.