Eight ways to distinguish the quality of polypropylene fiber
Polypropylene fiber using polypropylene after high-temperature melting, wire drawing, short cut into a polypropylene fiber, because polypropylene fiber quality is relatively light, unit weight monofilament fiber number is huge, and has a strong affinity for cement, at the same time has strong acid resistance, strong alkali resistance, weak thermal conductivity, has extremely stable chemical properties. Therefore, polypropylene fiber is widely used in underground engineering waterproofing, roofing, wall, floor, pool, basement, and road and bridge engineering. Polypropylene fiber is mortar, concrete engineering anti-crack, anti-seepage, wear-resistant new ideal material.
With the booming development of infrastructure and real estate in many countries, the demand for polypropylene cracking fiber is also increasing. Therefore, smell-sensitive businesses continue to pour into this industry. Due to the differences in the production process and production equipment and technology, the performance of products varies greatly, with the strength ranging from 280Mpa-980Mpa. The diameter of monofilaments varies from 18 microns to 100 microns, resulting in customers do not know how to follow, and how to choose products. How to choose their own products in many products, Bede chemical as a professional polypropylene fiber manufacturer, gives you the following suggestions, for reference only:
1. Look at the color of the fiber, high-quality polypropylene anti-cracking fiber, uniform color, shiny, and good whiteness. If the color is dark, gray uneven fiber, please choose carefully.
2. Look at the length uniformity of the fiber. The products produced by good anti-crack fiber manufacturers should be of uniform length, and the tow is more obvious.
3. Grasp the fiber by hand, feel dry, and smooth, if feels wet, or there is obvious liquid oozing, mostly caused by adding water or adding excessive water, this kind of bubble aquatic product will reduce the strength of the fiber so that the quality cannot be guaranteed.
4. Observe the diameter of the fiber. The coarser the diameter of the fiber, the rougher the feel, and the lower the strength and performance of the product.
5. Odor identification: High quality: environmental protection, light taste without irritation; And inferior polypropylene fiber: pollution, strong taste, and irritation
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6. Water bath comparison method: Take 500ml water into two water cups, add 0.4g polypropylene fiber of the same specification, stir for 10 seconds, and observe, high quality is evenly dispersed, and suspended in water; The inferior ones are not uniformly dispersed or suspended in clumps or clusters in water or underwater.
7. Sunlight: inferior polypropylene fiber due to reducing cost, and no anti-ultraviolet treatment, in the sun for one, to two years will lose strength, so inferior polypropylene fiber in concrete difficult to play its role for a long time. As long as the site sampling, after a long time of sunning night dew, detection of its tensile strength can be different.
8. Detection method: inferior polypropylene fiber: low tensile strength, generally < 350Mpa; The elongation is large, generally > 60%; Poor alkali resistance, due to the mixed concrete and hardened concrete being strong alkaline (pH≥12), in this environment the strength of the fiber will gradually reduce, so the effect of concrete is very small. It can be inspected on the site (to strictly identify the consistency of the submitted filament and the polypropylene fiber short filament on the site) and then submitted for inspection.