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High temperature substrate protective structure

A technology of substrate and crystallinity, which is applied in the direction of coating non-metallic protective layer, application, and bendable conductors, can solve the problems of poor long-term durability, high shrinkage, difficult coating treatment, etc., and achieve the reduction of metal Effects of corrosion, improvement of electrical insulation, and improvement of workability

Active Publication Date: 2010-09-22
POLYMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to their narrow processing window, they are extremely difficult to process as coatings, are limited to very simple part geometries, and have poor long-term durability even in mild environments
These problems can be caused by stresses from high melt temperatures during the process due to the Coefficient of Linear Thermal Expansion (CLTE) mismatch between the polymer and the metal, high shrinkage due to crystallization, and low elongation , resulting in cracking, pinholes, poor adhesion and delamination
[0007] Amorphous polymers, such as polyphenylsulfone (PPSU), polyetherimide (PEI), and A-PEKK, can be combined with metals and have good durability due to their wide processing window, wide softening point, Lower shrinkage, greater ductility, and better adhesion to metal surfaces; however, these polymers are less abrasion resistant than semi-crystalline polymers

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment I

[0054] PAEK-based coatings comprising an A-PEKK base layer and a PEKK top layer were compared to standard single-layer PEEK by measuring resistance to thermal cycling in an oven and in ice water. Compared with PEEK, A-PEKK has very low shrinkage (0.3% to 0.5% compared with 0.7% to 1.0% for PEEK) and twice the elongation at break (80% compared with 40% for PEEK) , but poor wear resistance. It is less crystalline (less than 15%) than PEEK, which is typically 25% to 30% crystalline. A-PEKK can be easily applied to components of various geometries and sizes without fracture or delamination like PEEK. Compared to PEEK, A-PEKK / PEEK multilayer coatings show many advantages, such as processability, durability against stress, and excellent wear resistance. The present invention uses, in part, ΔT, which is the number of test cycles, and the pass / fail definition, which appears specifically in the Sample Preparation, Test Methods, Results and Conclusions sections. Use industry standard...

Embodiment IV

[0106] Example IV. Bonding of A-PEKK / PEEK film to metal by secondary application of heat and pressure.

[0107] An A-PEKK / PEEK film was extruded, wherein the A-PEKK layer was 1 mil thick and the PEEK layer was 5 mil thick. The shrinkage rate of material, elongation at break and crystallinity are with embodiment 1. The membrane was placed on a degreased aluminum plate. The film-metal system was placed between two heavy flat steel plates, pressurized and heated to 635°F. Since the processing temperature is below the melting temperature of the semi-crystalline PEEK layer, the PEEK layer does not melt. The processing temperature is above the melting temperature of the amorphous A-PEKK layer, which will soften and bond to the metal.

Embodiment V

[0108] Example V. Use of A-PEEK / PEEK structure as tie layer for fluoropolymer-metal coating.

[0109] Due to better adhesion and lower solvent permeability than porous fluoropolymers, PEEK is occasionally used as a base layer for thick porous fluoropolymer coatings such as PTFE. Better adhesion and lower permeability improve durability and corrosion resistance compared to containers with simple PTFE coatings.

[0110] Using A-PEKK / PEEK instead of PEEK improved the adhesion of the polyketone layer to metal. Solvent and gas permeation through polymers are compared as follows: PEEK<A-PEKK<<PTFE. Since the PEEK layer shrinks when it crystallizes, the use of A-PEKK / PEEK improves the quality of the coating by eliminating pinholes, cracking and delamination inside containers and tubes.

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Abstract

Substrate protective structures, including high performance polymers and polymer coatings from 1 to over 2500 mils thick, are disclosed. The structures protect metal and other surfaces with heat resistant, abrasion resistant, and chemical inert polymers. The structures are applied to the substrate in a manner that provides easy processing of curved and bent surfaces, increased adhesion of metal to polymer, greater resistance to mechanical and thermal stresses that cause cracking and de-lamination, and increased environmental resistance.

Description

[0001] related application [0002] This application claims priority to US Provisional Application No. 61 / 001,689, filed November 2, 2007. Background technique [0003] The present invention relates to substrate protection structures comprising new high performance polymers and polymer coatings ranging in thickness from 1 mil to over 2500 mils. The invention also relates to the protection of metal surfaces with polymers that are heat-resistant, wear-resistant, and chemically inert, and structures that tightly bond these polymers to the metal to provide: (1) Curved and bent surfaces that are easily machined ); (2) stronger adhesion between metals and polymers; (3) greater resistance to mechanical and thermal stresses that lead to cracking and delamination; and (4) greater environmental resistance . [0004] A thermoplastic is defined as a material that repeatedly softens when heated above its melting point and repeatedly hardens when cooled below its melting point. Examples...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/04H05K3/28B32B7/022B32B7/027
CPCB32B27/288B32B2311/24B32B2307/306B32B2037/243B32B7/02B32B2307/50F16L58/1027B32B2307/554B32B2307/704B32B2307/712B32B2309/02B32B2311/30B32B15/08B32B2311/18B32B2371/00B32B2307/714F16L58/1045B32B7/10B32B15/18B32B15/20B32B27/08B32B27/18B32B27/28B32B27/281B32B27/285B32B2264/10B32B2264/101B32B2264/107B32B2270/00B32B2307/734B32B2597/00C08G65/4012C08L71/00C08G2650/40Y10T156/10Y10T428/24942B32B7/022B32B7/027
Inventor 许砥中戴维·贝里乔治·I·巴特勒
Owner POLYMICS
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