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powdered binder

An adhesive and powder technology, applied in the field of powdered heat-activatable adhesives, can solve the problem of uneven distribution of adhesive particles, agglomeration of powdered adhesive particles, and adhesive adhesion of uneven strength. knots etc.

Active Publication Date: 2020-10-02
ZEPHYROS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still the problem of agglomeration of powdered binder particles
We have found that while the method of US 2014 / 0027039 offers benefits and can be used for the delivery of heat-activatable adhesives, these problems still exist, leading to uneven distribution of adhesive particles on the surface, which in turn can lead to Forms an adhesive bond of uneven strength between substrates

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0062] Code L5236 (foamable material) and L5810 (non-foamable material) from L&L Products as pellets available and with an average particle size of 1.5 to 3 mm were pulverized into a powder with an average particle size of about 0.3 mm.

[0063] The powder and stock pellets were applied to three flat test specimens of 0.7 mm and 2 mm thick galvanized steel, respectively.

[0064] The powder was applied by electrostatic spraying and the pellets by extrusion. Overlay another steel sheet on top of the adhesive and press the sheets together and hold at 165°C for 30 minutes. The T-peel strength of the resulting bond was measured as follows and the results are as follows.

[0065]

[0066] It was shown that the bonding performance was not significantly changed when extruded pellets or sprayed powder were used on flat steel sheets.

[0067] Then apply the adhesive to the figure 1 Auto parts shown in . Electrostatic spraying of powdered binder results in a uniform coating of th...

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Abstract

The binder comprising a solvent-free powder having an average particle size in the range of 20 to 300 microns, preferably 20 to 150 microns, is thermally activated at a temperature in the range of 140°C to 220°C, which is available at temperatures below the thermal activation temperature. Flowable, dry at ambient temperature and non-tacky to the touch, the use of powdered adhesives is especially useful for bonding uneven surfaces with complex contours.

Description

technical field [0001] The present invention relates to heat-activatable adhesives, in particular powdered heat-activatable adhesives, their production, and their application to substrates by spraying. Adhesives for bonding complex non-planar shapes employed in the present invention are particularly useful where application of the adhesive by extrusion or as a tape is difficult to produce a uniform adhesive layer due to the complex non-planar surfaces . Background technique [0002] Spray application of thermoset materials such as by electrostatic deposition provides a powder coating method that produces accurate and consistent layer thicknesses. Deposition by spraying is common for a variety of curable materials including inks, epoxies, polyesters, ceramics and others that cure shortly after deposition. However, the deposition of binder materials that are then heated to coalesce without activation, and then activated by heating after deposition, presents many challenges, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J5/06C09J5/08C09J9/00
CPCC09J5/06C09J5/08C09J9/00C09J163/00C08L2205/035C08L2207/53C09J2463/00C08L71/12C08G2650/56C08L51/04C08L63/00B05D1/06
Inventor 摩根·切尼C·亨利
Owner ZEPHYROS INC
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