Spinning finish for polyvinyl alcohol fiber for toughening cement concrete

Abstract

The invention relates to a spinning finish for polyvinyl alcohol fiber for toughening cement concrete. The active ingredient comprises the following components: 16-30 parts of antistatic agent-fatty alkyl alcohol amine, 12-28 parts of smoothing agent-unsaturated fatty acid, 32-55 parts of stabilizer-alkyl polyoxyethylene ether and 3-10 parts of additive-nonpolar alkyl alkoxy silane or halogenatedalkyl alkoxy silane. The spinning finish can maintain the advantages of relatively high strength and modulus, strong cohesive force, good dispersity, high light resistance, alkali resistance and the like of polyvinyl alcohol fiber; and the key is that the nonpolar substance in the spinning finish can realize a certain 'shielding effect' on the polar group on the surface of the polyvinyl alcohol fiber so as to avoid stress concentration on the substrate interface and improve the toughness of the cement concrete. The components of the spinning finish are mutually coordinated and reasonably blended, thus the comprehensive performance is good, and the fiber obtains perfect characteristics of smoothness, bundling and the like.

Description

technical field [0001] The invention relates to an oil used in the spinning process of polyvinyl alcohol, in particular to a spinning oil used for toughening polyvinyl alcohol fibers of cement concrete. Background technique [0002] The price of polyvinyl alcohol fiber is low, the density is small, the cohesion is high, the dispersibility is good, and it is easy to stir; compared with other synthetic fibers, polyvinyl alcohol fiber has good hydrophilicity, high elastic modulus, and has a high specific surface area. Good compatibility with cement concrete, suitable for various grades of cement, with obvious strengthening effect. In addition, its light resistance and alkali resistance are also good, it has excellent chemical stability, and the amount of addition is small (the amount is only 1 / 5 of asbestos), and it is recognized as the most promising material to replace asbestos. The application and research of polyvinyl alcohol in concrete is more and more extensive. [000...

AI Technical Summary

Problems solved by technology

[0004] Since the polyvinyl alcohol fibers generally used for cement concrete reinforcement require higher strength and modulus, such fibers need to have a higher degree of alcoholysis to meet the standards for reinforcing fibers, so the fibers will contain a large number of hydroxyl polar groups , but in actual use, it is found that although a large number of polar groups and cement form a strong interfacial bond, it is conducive to the effective transfer of stress from the matrix to the fiber, better exerting the reinforcing effect of the fiber, and improving the strength of reinforced concrete. , but often due to too strong interfacial cohesion, it is easy to cause fiber stress concentration, and the toughness of reinforced concrete decreases.

[0005] However, most of the current market and researchers only pay attention to endowing polyvinyl alcohol fibers with high strength and high modulus, functionalization and high-efficiency reinforcement effects, etc., and rarely pay attention to the consideration of performance gains in various aspects of cement concrete in actual use; and for The surface modification of reinforced cement concrete polyvinyl alcohol fiber only focuses on the improvement of spinning raw materials, processes and equipment, while ignoring the importance of polyvinyl alcohol spinning oil, resulting in some properties of finished silk that cannot meet the requirements of civil engineering, and also To a certain extent, it limits the application of polyvinyl alcohol in civil engineering