Power transmission belt and cord adhesive system and adhesion method
a technology of adhesive system and transmission belt, which is applied in the direction of adhesive process with surface pretreatment, transportation and packaging, etc., can solve the problems of complex series of treatments that are expensive, product performance will not perform under dynamic conditions, and require optimization for best performance, etc., to achieve good balance of physical properties, environmental resistance, and low cost
Inactive Publication Date: 2011-01-13
THE GATES CORP
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Benefits of technology
[0011]The present invention is directed to adhesive systems and methods which provide bonding of textile reinforcement cords to rubber in engineered elastomeric products such as belts, hose, or tires. The adhesive system provided has fewer process steps or coating layers than the conventional three layer treatment described above. The adhesive system may also provide for flexibility of the cord and a good balance of physical properties, environmental resistance, and low cost. The adhesive system is predominantly polyurea and / or polyisocyanurate reaction products of isocyanate-terminated diene polymer and avoids use of halogenated polymers.
Problems solved by technology
Without significant adhesion, the product will fail to perform under dynamic conditions.
This is a complex series of treatments that are expensive, involve some environmentally unfriendly components, and require optimization for best performance.
Method used
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[0028]The inventive fiber adhesive treatment system may have a single adhesive coating or may have two coatings: a primer coat and an overcoat.
[0029]The inventive fiber-to-elastomer adhesive treatment system is based on isocyanate-terminated diene elastomer as the primary, or even only, adhesive component. The treatment system may consist of a single layer of adhesive applied to the fiber for example via an organic-solvent-based cement. Alternatively, the treatment system may also include a primer layer applied to the fiber before the aforementioned adhesive layer. Herein, when a two layer treatment system is thus used, the first layer is called the “primer” and the second and final layer is called the “overcoat.” In a one layer treatment system, the layer may sometimes be called the overcoat and sometimes called the “adhesive,” depending on the context. The term “cement” implies a fluid mixture containing the chemical components of the adhesive treatment. A cement-treated textile i...
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Abstract
A power transmission belt incorporating an adhesive treatment system and method for bonding fiber to rubber which includes an optional primer coat based on a low-molecular-weight isocyanate, followed by an overcoat including: (a) a prepolymer based on an isocyanate-terminated diene oligomer, and optionally (b) a low-molecular-weight isocyanate, and / or (c) a thermoplastic urethane comprising the reaction product of the same prepolymer with MDI and EHD. A polyester, aramid, or carbon fiber tensile cord for rubber reinforcement may be treated with the primer coat and the overcoat. A power transmission belt or other dynamic rubber product having ethylene-alpha-olefin elastomer as the primary rubber constituent may be reinforced by the tensile cord.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This invention is a continuation of U.S. patent application Ser. No. 11 / 947,470 filed Nov. 29, 2007, the entire contents of which are hereby incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates generally to a power transmission belt, more particularly to an adhesive system for tensile cord in a belt, and specifically to the use of isocyanate-terminated diene polymer to bond cord to elastomeric belt material.[0004]2. Description of the Prior Art[0005]V-belts and multi-V-ribbed belts in particular are conventionally employed for the transmission of peripheral forces in drive systems. Conventional belts have a flexible, generally elastomeric main belt body portion defining an undercord- or compression section, an overcord- or tension section and a tensile- or load-carrying section disposed between the undercord and overcord sections. The load-carrying section in turn generall...
Claims
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IPC IPC(8): B32B37/12B05D3/02
CPCB29D29/08C08G18/69C08G18/7664C09J175/04F16G1/08Y10T428/2457F16G5/06F16G5/20Y10T428/2933Y10T428/2929F16G1/28Y10T428/249933
InventorBURLETT, DONALD J.
OwnerTHE GATES CORP