Toughening modified polyformaldehyde material without secondary granulation and preparation method thereof
A polyoxymethylene material, toughening modification technology, applied in the field of polyacetal composition, can solve the problems of poor effect, high energy consumption, poor toughness of polyoxymethylene, etc., to achieve elasticity improvement, toughness improvement, and not easy to break Effect
Pending Publication Date: 2021-08-24
重庆云天化天聚新材料有限公司
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Problems solved by technology
[0009] The technical problem to be solved is: the toughness of polyoxymethylene is poor, but the existing toughening modification schemes either have poor effect or high energy consumption
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] A toughened modified polyoxymethylene material without secondary granulation, comprising a polyoxymethylene matrix and toughened silk segments dispersed in the polyoxymethylene matrix;
[0030] The toughened filaments are continuous filaments closely combined with the polyoxymethylene matrix, and the toughened filaments are evenly distributed in the polyoxymethylene matrix and arranged towards disorder. Here, the toughening filaments are arranged in a disordered manner, that is, their arrangement is not in the same direction as in FRP, but uniformly distributed, and there are toughening filaments facing in any direction.
[0031] The toughened filaments cannot be twisted and entangled filaments of short fibers like cotton threads or wool threads, otherwise they will be easily lost during extrusion and granulation.
[0032] The toughened yarn segment is untwisted yarn and / or false twisted yarn, that is to say, the toughened yarn segment can be a monofilament or a multifi...
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Abstract
The invention relates to the technical field of polyacetal compositions, and discloses a toughening modified polyformaldehyde material without secondary granulation and a preparation method thereof. The toughening modified polyformaldehyde material comprises a polyformaldehyde matrix and toughening filament segments dispersed in the polyformaldehyde matrix; and the toughening filament segments are continuous filaments tightly combined with the polyformaldehyde matrix, and the toughening filament segments are uniformly distributed in the polyformaldehyde matrix and are arranged in a disordered manner. According to the invention, the toughening wire segments which are cut into small segments are uniformly dispersed into the polyformaldehyde matrix and are tightly combined with the polyformaldehyde matrix, and the orientations of the toughening wire segments are mutually crossed, so that the anisotropy of the strength of the polyformaldehyde with high crystallinity is overcome, and the toughness of the polyformaldehyde is enhanced. According to the polyformaldehyde material disclosed by the invention, a sea island structure does not need to be formed, and only the toughening filament segments need to be uniformly distributed in the polyformaldehyde matrix, so that secondary granulation and primary extrusion granulation are not needed, and compared with a polyformaldehyde material needing secondary granulation, the processing process can save more than half of energy in the processing process.
Description
technical field [0001] The invention relates to the technical field of polyacetal compositions, in particular to a toughened modified polyoxymethylene material without secondary granulation and a preparation method thereof. Background technique [0002] Polyoxymethylene is one of the five general-purpose engineering plastics. Its regular molecular chain is composed of carbon-oxygen bonds. Since the molecular chain is very regular and the length of the carbon-oxygen bond is shorter than the carbon-carbon bond in common polyethylene, it is easy to to a high degree of crystallinity. In this way, high rigidity, high wear resistance, and high solvent resistance that are difficult to possess in general polymers are obtained. [0003] Due to the high crystallinity of POM, various characteristics are very similar to those of single crystal, which makes it have various advantages of crystal, but also has various disadvantages of crystal, such as poor toughness, notch sensitivity, no...
Claims
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IPC IPC(8): C08L59/00C08L77/02C08L77/06C08L79/08C08L35/00C08K5/134B29B9/06
CPCC08L59/00B29B9/06C08L2205/035C08L2205/02C08L2205/08C08L2205/16C08L77/02C08L77/06C08L79/08C08L35/00C08K5/1345
Inventor 李磊景咸坤彭骏张红伟
Owner 重庆云天化天聚新材料有限公司