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Sizing composition for glass fibers

Inactive Publication Date: 2005-04-21
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention is directed to starch-oil type sizing compositions for glass fibers. The sizing compositions can provides glass fiber strands having a variety of advantageous properties including high fliability and low insertion time in weaving. Glass fiber strands treated with the sizing composition may withstand a wide variety of further processing operations such as twisting, chopping, forming into a bundle, roving, chopped mat or continuous strand mat or weaving or knitting into a cloth. Such strands can be useful in a wide variety of applications, such as cloth for printed circuit boards.

Problems solved by technology

However, open strands and / or zig-zagging strands can reduce the quality of the final fabric product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057] Table 1 describes a specific example of the sizing composition of the present invention which was prepared from the ingredients listed to produce about 1,000 gallons of the sizing composition.

TABLE 1IngredientAmount (lbs)HYLON ® starch198.8HiSet ® 369 starch124.3Kester Wax 385124.3CT-7000 oil49.7TWEEN 81 emulsifier24.9Alubraspin 261 lubricant37.3MAZU ® DF-136 defoamer5.0A-187 coupling agent24.9Acetic Acid1.6CL-2141 Biocide50 mL

[0058] In the example, the aqueous sizing composition was prepared by adding the starch to an agitated mixing or slurry tank to which was previously added about 300 gallons of demineralized water.

[0059] Cooking of the starch took place by pumping the starch mixture from the slurry tank through a jet cooker in which steam was injected directly into the starch mixture. The steam addition rate was controlled to give a cook temperature of about 126.5° C. (±2.2° C.) and the exit back pressure was controlled at approximately 27 psig (±7 psig). The residenc...

example 2

[0069] G-75 glass fibers sized with the composition of this invention can demonstrate improved performance in air jet looms as compared to G-75 glass fibers sized with prior art sizing compositions. For example, G-75 glass fibers sized with the composition in Example 1 required less than 4 bar of air pressure at the main jet nozzle of a ZAX-e air jet loom (Tsudakoma Corp., Japan) while operating at a rate of 1000 picks per minute. Under similar conditions, G-75 glass fibers sized with a sizing disclosed in the examples of U.S. Pat. No. 5,393,335 required approximately 6 bar of air pressure at the main jet nozzle. Accordingly, use of glass fibers sized with the composition of this invention can reduce the amount of air pressure needed at a main jet nozzle of an air jet loom by 20 to 30 percent (i.e. increase Liability).

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Abstract

An aqueous sizing comprising a starch mixture comprising a high viscosity starch and a low viscosity starch cooked at a temperature sufficient to solubilize at least 50% of the high viscosity starch and to solubilize at least 50% of the low viscosity starch. Glass fiber strands formed from glass fibers at least partially coated with the sizing composition of the present invention can exhibit good fliability and insertion time properties when used in an air jet loom.

Description

FIELD OF INVENTION [0001] The present invention is directed to sizing compositions for glass fibers. BACKGROUND [0002] Glass fibers are typically treated after forming with a sizing composition that can impart desired properties. As used herein the term “size”, “sized”, “sizing” means a coating composition applied to the glass fibers after formation of the fibers. After their formation and treatment, the sized glass fibers can be gathered into bundles or strands comprising a plurality of individual fibers. The strands may be wound into a spool or “forming package.” The forming packages can be dried to remove moisture from the fibers. For certain uses, the fibers are typically wound onto a bobbin via conventional textile twisting techniques such as a twist frame. [0003] A sizing composition can serve several functions. It can function as a lubricant and binding agent and can protect the fibers from abrasion with each other. [0004] A sizing composition can also improve the performance...

Claims

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Application Information

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IPC IPC(8): C03B37/10C03C25/26D02G3/00D03D15/02D06M15/11H05K1/03
CPCC03C25/321Y10T428/2933H05K1/0366
Inventor WANG, BOY-CHY
Owner PPG IND OHIO INC
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