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Surfacing and/or joining method

A technology for polymers and products, applied in chemical instruments and methods, thin material handling, transportation and packaging, etc., can solve problems such as reduced performance of structural adhesives, undesired moisture absorption characteristics, etc., to reduce expensive costs, reliable and consistent production. Effect

Inactive Publication Date: 2012-07-18
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition to exhibiting brittleness problems, the cured resins sometimes exhibit undesired hygroscopic properties (especially when high concentrations of polar groups are used), which lead to a reduction in the performance of the structural adhesive

Method used

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  • Surfacing and/or joining method

Examples

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Effect test

preparation example Construction

[0072] Preparation of Curable Compositions

[0073] The curable composition of the method of the present invention can be prepared by combining at least one modifier in particulate form, at least one resin, and any other ingredients, optionally with stirring or agitation. The resin may be liquid, solid or a combination thereof, and the composition thus obtained may, for example, be in the form of a paste or a film, for example. Depending on the specific formulation and viscoelastic properties, such membranes may be handled with or without support materials (eg, built-in gauze or removable liners).

[0074] Preferably, the particulate modifier is well dispersed in the resin so that aggregation does not substantially occur. If desired, a solvent can be used to assist in binding and dispersion, provided that the selected solvent is one that does not significantly react with the ingredients of the composition, and does not significantly dissolve or swell the particulate modifier ...

Embodiment 1—3 and comparative Embodiment 1—9

[0156]Examples 1-3 and Comparative Examples (CE) 1-9 in Tables 1, 3, and 4 below illustrate the role of various toughening modifiers in linking environmentally modified cured polymer-based composite articles together to provide Effects in connected structures. The stated amounts are provided in parts by weight (pbw), wherein the combined amount of all ingredients is between 99 and 102 pbw.

Embodiment 1

[0157] Example 1 and Comparative Example 1 were prepared as described above under "Preparing Cured Joints" using a cure cycle of 250°F (121°C) and then evaluated for Overlap Shear Strength (OLS) at 200°F (93°C). Examples 2 and 3 and Comparative Examples 2-9 were prepared as described above under "Preparing Cured Joints" using a cure cycle of 350°F (177°C) and then evaluated for overlap shear strength at 277°F (136°C) .

[0158]

[0159] Moisture Content of Cured Polymer Matrix Composites Articles

[0160] Cured polymer matrix composite articles are provided in two ways as previously described. After environmental conditioning, they were evaluated as described in the test method "weight loss". The words "dry", "ambient" and "wet" in the tables refer to the environmental conditions to which the cured polymer matrix composite article is exposed. The results are listed in Table 2 below.

[0161] Table 2

[0162]

[0163] Overlap Shear Strength (OLS) of Cured Joints

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Abstract

A method for surfacing a polymeric composite article and / or for joining (for example, by bonding or by co-curing) the article and an adherend (for example, a second polymeric composite article) comprises (a) providing a cured or curable polymeric composite article; (b) providing a curable composition comprising (1) at least one thermosetting resin, and (2) at least one preformed, substantially non-functional, particulate modifier comprising at least one elastomer; and (c) directly or indirectly applying the composition to at least a portion of at least one surface of the article.

Description

field of invention [0001] The present invention relates to methods of surface treating polymer-based composite articles and attaching such articles to various substrates (eg, by bonding or co-curing). On the other hand, the invention also relates to the surface-treated structures and connection structures thus produced. Background of the invention [0002] Adhesives have been used in many structural applications including in vehicle construction, computer enclosures, buildings, equipment, and the like. For example, structural adhesives have been used in vehicle assembly (such as automobile and aircraft assembly) to replace or supplement traditional joining techniques such as welding, nuts and screws, and rivets. [0003] Epoxy resins are monomers or prepolymers that react with curing agents to produce high-performance cured resins. The cured resins exhibit many desirable chemical and physical properties (e.g., heat or chemical resistance, tack retention, low shrinkage, abr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C09J163/00C08J7/043
CPCC08L81/06C08L77/10C08J7/047C09J163/00C08L9/02C08J7/04C08L2666/02C08L2666/04C09J133/04C09J121/00C08J7/0427Y10T428/254Y10T428/31786Y10T428/31721Y10T428/31511Y10T428/31504C08J7/043B32B27/38B32B27/18C08J2400/24C08J2463/00C08J2433/08C08J2421/00B32B2305/72B32B37/16B32B2038/0076B32B37/12B32B2037/1253B32B2305/076C09J7/21C09J7/35
Inventor 德米特里·萨利尼科夫克莱顿·A·乔治
Owner 3M INNOVATIVE PROPERTIES CO
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