43results about How to "Little change in mechanical properties" patented technology

The invention relates to an organosilicon fire retardant for ABS and a preparation method thereof. The invention provides an organosilicon fire retardant for ABS with good consistency with ABS, small mechanical properties influence on ABS, less addition, excellent flame retardation performance and other characteristics and provides a preparation method of the organosilicon fire retardant for ABS.The organosilicon fire retardant of ABS is a polymer. Under a condition of nitrogen protection, dimethyl siloxane cycle, aminosilane, trialkoxy silane and catalyst undergo a reaction with hexamethyldisiloxane as an end-capping reagent at a temperature of 80 to 140 DEG C. After the reaction, a low-boiling-point substance is extracted by pressure reduction and the organosilicon fire retardant product for ABS can be obtained.

The invention discloses a weather-resistant flame-retardant polypropylene composite material which is characterized by comprising 93-97wt% of polypropylene, 1-2wt% of main flame retardant, 0.2-0.5wt% of synergistic flame retardant, 0.1-0.5wt% of chain-cutting agent, 0.1-0.5wt% of foaming agent and 1.5-2wt% of carbon black, and further comprising 0.1-1wt% of other assistants, wherein the other assistants include one or more of antioxidant, dispersant and lubricant; and the carbon black is channel carbon black, and the particle size is 15-25nm. The invention also discloses a preparation method of the weather-resistant flame-retardant polypropylene composite material. According to the invention, the carbon black is selected as weather resistance modifier; the bromine-containing flame retardant, the synergistic flame retardant, the high-temperature chain-cutting agent and the high-temperature foaming agent are combined; the weather-resistant flame-retardant polypropylene composite material is prepared through melt blending; the weather resistance is excellent; the flame retardance is up to UL94V-0 level; the mechanical performance of the material changes little before and after modification; and the weather-resistant flame-retardant polypropylene composite material is low in raw materials and simple and easy to process.

The invention relates to a preparation method for a modified polyvinyl chloride material. The preparation method comprises the following steps: mixing titanium dioxide with carbon black; raising temperature to 60-80 DEG C; then, adding titanate coupling reagent, stirring for 10-20min, and drying and grinding to obtain weather-proof accessory ingredient of which the particle size is 100nm or below,wherein the mass ratio of titanium dioxide, carbon black to the titanate coupling reagent is (4-7): (2-5):1; after polyvinyl chloride, auxiliary materials and the weather-proof accessory ingredient are evenly mixed, carrying out extrusion molding to obtain the modified polyvinyl chloride material. According to the preparation method, through preprocessing, titanium dioxide, carbon black and the titanate coupling reagent are more favorably dispersed and combined with polyvinyl chloride, in addition, the synergetic anti-ultraviolet function of titanium dioxide and carbon black can be improved,meanwhile, the titanate coupling reagent is more favorable for combining titanium dioxide, carbon black and polyvinyl chloride than other coupling reagents, so that the resistance ability of the polyvinyl chloride material for ultraviolet can be improved, the polyvinyl chloride material is unlikely to be decomposed, aged and discolored, mechanical performance change is small, excellent weather fastness is obtained, and the preparation method is especially suitable for preparing various classes of PVC (polyvinyl chloride) pipe materials.

The invention provides a high-efficiency laser marking material. In the formula system of the high-efficiency laser marking material provided by the invention, the addition amount of laser auxiliary agent and black color masterbatch plays a leading role in the printing effect. With the increase of additive content and the decrease of carbon black content, the mechanical properties of the material will not change much, but the printing effect will be significantly improved. In addition, the laser additive can help improve the black PE material to absorb the special wavelength emitted by the laser, so that the surface layer of the polymer is carbonized, and through foaming, it appears white, which is in sharp contrast with the black PE sheath.

The invention belongs to the field of high polymer material research, and provides an organic silicon modified thermoplastic polyurethane elastomer (TPU) in order to overcome the defects of poor temperature resistance and hydrophobic property of the existing TPU. The elastomer consists of the following components in parts by weight: 20-60 parts of macromolecular dihydric alcohol, 2-10 parts of terminal hydroxyalkyl end-blocked polydimethylsiloxane, 10-20 parts of diisocyanate, 2-8 parts of a micromolecular chain extender, 0.1-0.5 part of a catalyst, 0.1-0.5 part of an antioxidant and 0.1-0.5 part of an ultraviolet light absorber. Due to the unique chemical structure and composition, organic silicon has a series of excellent properties, such as high temperature and low temperature resistance and hydrophobic property, which just can make up the defects of the TPU. The invention also provides a preparation method of the elastomer, the preparation method adopts a prepolymer two-step process and is less in side reaction, and the prepared TPU is good in structural regularity.