55results about How to "Avoid Metal Contamination" patented technology

The invention relates to the technical field of high polymer materials, in particular to ABS noctilucent masterbatches and a preparation method thereof. The ABS noctilucent masterbatches comprise the following components in percentage by mass: 50 to 75 percent of ABS, 5 to 10 percent of dispersant, and 20 to 40 percent of noctilucent powder, wherein the dispersant is dimethyl silicon oil and / or polyethylene wax. The ABS noctilucent masterbatches and the preparation method thereof have the benefits that the abrasion of a machine caused by noctilucent powder during a production process is reduced and the blackening phenomenon of noctilucent powder is avoided by the improvements, such as extruding through a single screw, reducing extruding rate, raising processing temperature, mixing materials in a plastic material barrel at a low speed, of process conditions; the processing temperature is risen, the coating capacity of melt to the noctilucent powder is improved, and the ABS noctilucent masterbatches with higher concentration are prepared by mixing ABS powdery matrix resin and ABS particular matrix resin; the interference to the luminance caused by the color of the matrix resin is reduced by using a suitable amount of dispersant; the ABS noctilucent masterbatches prepared by the preparation method has the advantages of high concentration, long-acting luminescence, large molecular weight of ABS, low abrasion to the machine, uniform dispersion, no chromatic aberration, wide application range and the like.

The invention discloses a method for dyeing a fabric with plant dye. In the method, dye mother liquor extracted from natural plants is used as dye liquor, a pretreated fabric is soaked in the dye liquor, a dyeing additive is added into the dye liquor, no dye mordant is added, ultrasonic dyeing is conducted according to the bath ratio of 1:3-10 and at the temperature of 30-50 DEG C, and finally dyed fabric meeting the demand for firmness is obtained. According to the obtained method for dyeing the fabric with the plant dye, the common dyeing additive is used for preparing the natural plant dyeliquor without usage of toxic dye mordant, ultrasonic dyeing with the low bath ratio is conducted, and finally the dyed fabric which meet the demand for dyeing firmness and is environmentally friendlyis obtained; in the method, during dyeing, the dyeing bath ratio can be decreased greatly, water used for production is further saved, more importantly, the amount of wastewater is reduced, there isno metal pollution in the wastewater, there are no cancerogenic substances, and the meaning of environmental protection is remarkable.

The present invention proposes a method for manufacturing a capacitor, comprising: providing a semiconductor substrate in which several trenches are formed; forming a lining oxide layer on the sidewall and bottom of the trench; forming a covering part on the sidewall of the trench The nitride layer lining the oxide layer; using the nitride layer as a mask, etching the lining oxide layer and semiconductor substrate exposed in the trench to form an area with increased area; the sidewall and bottom of the area with increased area in the trench The first electrode is formed; after removing the nitride layer, a dielectric layer and a second electrode are sequentially formed on the first electrode and the sidewall of the trench. The invention avoids metal pollution to the electrode, effectively protects the electrode, and improves the quality of the electrode and the subsequently formed capacitor.