Methods and compositions for forming elastomeric polyurethane articles and associated elastomeric polyurethane articles formed thereof
An elastomer and polyurethane technology, applied in the field of producing elastomer polyurethane products, can solve the problems of inappropriate processing technology, increased cost and processing time, stickiness, etc.
Active Publication Date: 2020-06-30
BASF SE
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Problems solved by technology
Such products may sag or be tacky without long cycle times, so those skilled in the art cannot apply such compositions as stacked layers
Additionally, conventional systems often require additional heat to fully cure to form the final product, which increases cost and processing time
Even further, conventional polyurethane systems are not suitable for new processing technologies such as 3D writing, 3D microdispensing or similar technologies that can create 3D articles
Method used
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Embodiment
[0135] Elastomeric polyurethane articles were prepared according to the present invention and subsequently evaluated for various physical properties.
[0136] Sample Evaluation Procedure
[0137] Part A: Formation of isocyanate-reactive components and evaluation of viscosity; formation of polyurethane compositions
[0138] The polyurethane compositions of the present invention, described and illustrated in Examples 1-8 in Table 1 below, were prepared for evaluation according to the following procedure. First, each of the liquid components of the resinous portion of the composition (i.e., polyol (i.e., hydroxyl-functional polymer), chain extender, catalyst, stabilizer, water, and colorant) is introduced into a standard or high-speed mixer and mix to form a mixture. A rheology modifier / thickener (i.e., thixotropic agent) is then added to this mixture, and the mixture is stirred in a high-speed mixer at 1000-2600 rpm for 5-30 minutes to ensure that the mixture uniform
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Abstract
Methods for forming elastomeric polyurethane articles are provided in which an isocyanate component including an isocyanate prepolymer is mixed with an isocyanate- reactive component having a viscosity ranging from 50,000 to 200,000 centipoise as measured by ASTM standard D2196, and wherein is applied as one or more layers onto a surface of a carrier substrate at an application rate ranging from 0.5 to 20 g / sec, with each one of said applied one or more layers independently having a thickness ranging from 0.2 and 10 millimeters and having a total thickness ranging from ranging from 0.2 to 60 millimeters. The applied layers are cured in the absence of added heat via an exothermic reaction to form the elastomeric polyurethane article having an abrasion resistance ranging from 20 to 250 mm<3>, a hardness ranging from 60 Asker C to 90 Asker C, and a density ranging from 330 and 1000 kg / m<3>.
Description
technical field [0001] The present invention generally relates to methods of producing elastomeric polyurethane articles and associated elastomeric polyurethane articles formed therefrom. Background technique [0002] With the growing demand for lightweight, high-performance structural materials, materials with such properties are being sought. Due to its broad property profile, polyurethanes are used today in a variety of applications, including the medical industry and consumer goods such as footwear, especially in high-performance footwear and custom-made products. Conventional elastomeric polyurethanes are widely used in midsoles, outsoles and unit soles of footwear products. Such articles of footwear are typically molded. However, conventional polyurethane products are designed to flow quickly and therefore are not suitable for manufacture without moulds. In addition, the use of other conventional elastomeric polyurethanes requires longer cycle times, often requiring...
Claims
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IPC IPC(8): C08G18/10B32B37/14C08G18/42C08G18/48C08K3/013
CPCC08G18/10C08G18/42C08G18/48C08G2170/90A43B13/12B29D35/14C08G2101/00C08L75/06C08L75/08
Inventor 王丽颖I·特恩雅叶瓦G·图尔科Z·T·伯恩
Owner BASF SE