Modified polymer fiber for constructional engineering and manufacture process thereof

Abstract

The invention relates to a modified polymer fiber for constructional engineering and a manufacture process thereof. The modified polymer fiber is manufactured by the following steps: selecting and assembling a plurality of fiber forming high molecular polymer monomers as raw materials, and regulating the fiber forming high molecular polymer monomers into molecular structures of fiber forming high molecular polymers through chemical modification technical means such as 'grafting', 'copolymerization' and the like according to a molecular structural design technical principle; and synthesizing and preparing the novel modified polymer fiber with special functions by adopting processing technology such as proportioning, melt condensation, high-pressure injection and extrusion, wet spinning into fiber, drawing and stretching bunches, cutting packages and the like. The fiber has high elastic modulus, strong breaking strength, good resistance to acids and bases, and good compatibility and adhesion with cement and aggregate, and is particularly suitable for preparing concrete for building large-span heavy-load superhigh typical projects.

Description

technical field [0001] The invention relates to a chemical synthetic fiber, in particular to a construction engineering modified polymer fiber and its manufacturing process. Background technique [0002] Concrete is a very important basic construction engineering material. With the improvement of construction technology, it has become a very important means to add admixtures to concrete to improve the performance of concrete; therefore, admixtures have become an important part of concrete and are indispensable in construction engineering materials. missing part. [0003] The use of admixtures in concrete in western industrialized countries began at the beginning of the last century; although it has a history of more than 90 years, it has only developed rapidly in the last 30 years. In 1975, the sales of concrete admixtures in the world were only 400 million US dollars, which rose to 1.6 billion US dollars in 1985, and surged to 6.5 billion US dollars in 1990. Now, in indu...

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Problems solved by technology

[0008] First, due to the limitation of the level of science and technology and the function of mechanical equipment, the structural composition and mixing ratio of concrete admixtures are not controlled accurately, resulting in some quality consequences

For example: the addition of low-concentration admixtures with naphthalene-based substances as the main component often causes excessive slump, decreased concrete strength, and increased cracks; admixtures with calcium sulfoaluminate and aluminum sulfate as the main component If the dosage is too large, the concrete strength will decrease and the durability will decrease; if the dosage of wood calcium admixture is too much, the phenomenon of "false coagulation" will often appear; Wait

[0009] Second, due to the influence of scientific research capabilities, manufacturing costs, market competition and other factors, although my country's concrete admixtures have complete functional categories and many varieties and grades, the development of product varieties is unbalanced, with a large number of low-end products, many brands, and rapid development. High-end products Small quantity, few brands, short supply

The main manifestations are: the structural components of the product are mostly inorganic compounds, less organic compounds, and less polymers; the product structure type is mostly single type, less compound type, and less organic and organic compound type; The structural form is mostly powder (or water), less emulsion, and less fiber; among fiber admixtures, glass fiber, asbestos fiber, and natural jute fiber are the majority. Although nylon fiber and vinylon fiber have appeared in recent years fiber, but there are not many application examples in typical engineering

The status quo of this kind of product structure must have single function, weak performance and many defects; such a status quo of product structure will inevitably make it difficult to accurately control the mixing ratio, poor uniformity and affinity after mixing, and prone to clustering , felting and other disadvantages, so it is easy to cause local quality consequences

[0010] Third, due to the lack of unified management in the admixture industry, inconsistent quality standards, and unlimited entry conditions, the quality control of concrete admixtures is uneven, and quality accidents are often prone to occur

At present, there are only a few large-scale professional admixture production enterprises that have complete and scientific technical documents, complete production process facilities, and a sound and reasonable quality assurance system that can produce qualified concrete admixtures; there are a considerable number of Small and medium-sized admixture production enterprises, the concrete admixture produced is only one of the company's many products, the technical documents are relatively simple, the production process facilities are mostly old general chemical equipment, the process technical parameters are not standardized enough, especially the lack of high-precision professional Quality inspection and laboratory instruments have no guarantee ability in terms of raw material quality, production process control, product quality inspection, etc. Therefore, product quality fluctuates; there are still a considerable number of small private enterprises, and even some family workshops are also producing Concrete admixtures, the products produced by these enterprises have neither production process formula nor testing and testing equipment, and some even start production with only a mixer, the product quality cannot be guaranteed at all, but the manufactured products can pass abnormal Channels enter the market in large quantities, seriously affecting the quality of construction projects

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