33results about How to "Process is easy to adjust" patented technology

The invention discloses a high-melt strength polypropylene foam material and a preparation method thereof. The matrix resin of the foam material is high-melt strength polypropylene. The high-melt strength polypropylene foam material has the following characteristics: (1) the melt index (190 DEGC/2.16kg) is 1.0-10g/min; (2) the molecular weight distribution Mw/Mn is 6-20; (3) the content of the molecules with molecular weight over 5 million is greater than or equal to 0.8% by weight; and (4) (Mz+1)/Mn is greater than or equal to 70. The foam material is prepared by premix melting, blending and foaming of the following components in parts by weight: 100 parts of high-melt strength polypropylene and 1-15 parts of foaming agent. The obtained foam material meets the environmental protection requirements of degradability, uniform cell, high physical heat resistance, low production cost and smooth surface, and is suitable for continuous large-scale production.

The invention provides a polypropylene foaming bead formed body and a preparation method thereof. The preparation method comprises the following steps: mixing polypropylene foaming beads having different foaming rates and prepared by using wide-molecular-weight-distribution high-melt-strength polypropylene as a raw material in proportion, and carrying out thermal molding of the above obtained mixed foaming beads to obtain the foamed body with good surface flatness and tight adhesion. The formed body can be widely applied to the heat insulation tableware field, the automobile interior decorative part field, the finishing material interlayer field, the product damping packaging field and the like. Additionally, the molded body can be recycled, causes no secondary pollution, and accords with circular economy requirements.

The invention discloses a composite foaming agent and a polypropylene foam material prepared from the same. The foaming agent comprises the following components in parts by weight: 100 parts of azodicarbonamide, 10-20 parts of N,N'-dimethyl-N,N-dinitrosoterephthalamide, 10-30 parts of zinc oxide and 10-30 parts of sodium citrate. The polypropylene foam material comprises the following blended components in parts by weight: 100 parts of high-melt strength polypropylene and 3-15 parts of composite foaming agent. The composite foaming agent disclosed by the invention has controllable foaming temperature, uniform foam cell, smooth surface and high physical heat resistance; and the polypropylene foam material prepared from the composite foaming agent meets the environmental protection requirement, is degradable and low in production cost, and is suitable for continuous large-scale production.

The invention provides a preparation method of polypropylene foamed beads. The preparation method comprises the steps of preparing polypropylene according to a following method, adding organic peroxides into obtained polypropylene serving as matrix resin, and foaming by virtue of a physical foaming agent, so as to obtain the polypropylene foamed beads, wherein the method of polypropylene comprises the step of carrying out propylene polymerization reaction including two or more stages in two or more reactors which are connected in series for operation, wherein external electron donors used in the two stages are respectively alkane compounds and diether compounds. According to the preparation method, high-melt-strength polypropylene with wide molecular weight distribution is taken as a raw material, the organic peroxides are taken as a surface modifier of EPP beads, and the closed-hole-structured polypropylene foamed beads having the advantages that the diameters of foamed holes are uniform, the foamed holes are compact and the hole distribution is uniform can be prepared; the polypropylene foamed beads can be applied to the fields such as automobile manufacturing, packaging, building insulation, sport equipment, living goods, aerospace and the like.

The invention provides a composition used for preparing a polypropylene foaming material. The composition comprises high melt-strength anti-punching polypropylene as a base resin, the high melt-strength anti-punching polypropylene comprises a propylene homopolymer ingredient and a propylene-ethylene copolymer ingredient, and is characterized in that the molecular weight distribution Mw/Mn is less or equal to 10, and is greater or equal to 4; Mz+1/Mw is greater than 10 and less than 20; the content of a room-temperature xylene soluble substance is greater than 10 wt% and less than 30 wt%; and the ratio of a room-temperature trichloro-benzenes soluble substance Mw to a room-temperature trichloro-benzenes insoluble substance is greater than 0.4 and less than 1. The invention also provides a polypropylene injection foaming formed body produced by the composition through injection foaming and a preparation method thereof, and the formed body is suitable for the fields with special requirements on the part shapes such as automobile, aircraft, and high-speed rail internal and external decoration.

The invention discloses a smelting method for recycling lead, bismuth and precious metal from lead-containing tailings in acid making. The method comprises the steps that smelting slag is separated after high-temperature reduction and smelting treatment of the lead-containing tailings generated by the acid-making technology, and high-lead alloy is produced; then, through a vacuum distillation technology, lead-bismuth alloy and silver-rich alloy are obtained, wherein the obtained lead-bismuth alloy meets the lead and bismuth content requirements of lead-bismuth products, and refining and impurity removal procedures are reduced; at the same time, the lead and bismuth losses are also reduced; thus, with the method disclosed by the invention, the production cost is reduced, and the recovery rate of the precious metal is improved; the lead and bismuth recovery cycles are shortened, and the lead and bismuth recovery values are improved; manufactured products are high in quality; at the sametime, according to the method disclosed by the invention, the metal recycling separation can be achieved completely, and the comprehensive recovery rate of the metal is high; and no waste residue, dust or waste gas is generated, and the method facilitates full realizing of the value of raw materials, and is environmentally friendly. In addition, the method disclosed by the invention has the advantages of high adaptation to the raw materials, easiness in adjustment of the technology, and easiness in control of production process.

The invention provides a high-melt-strength anti-impact polypropylene foamed board and a preparation method thereof. The foamed board is prepared with high-melt-strength anti-impact polypropylene serves as matrix resin through foaming and rolling. The high-melt-strength anti-impact polypropylene is composed of a propylene homopolymer component and a propylene-ethylene copolymer component and has the characteristics that molecular weight distribution Mw/Mn is smaller than or equal to 10 and larger than or equal to 4, Mz+1/Mw is larger than 10 and smaller than 20, the room temperature dimethylbenzene soluble component content is larger than 10 wt% and smaller than 30 wt%, and the ratio of Mw of room temperature trichlorobenzene soluble components to Mw of room temperature trichlorobenzene insoluble components is larger than 0.4 and smaller than 1. The polypropylene foamed board has the advantages of being flat in surface, uniform in foam pore and aperture size distribution, good in high-and-low-temperature anti-impact performance, high in melt strength and the like, can be widely used in the fields of vehicle parts, food and electronic packaging, building decoration and the like, and is simple in preparation method, easy to operate and low in cost.

The invention provides a composition for preparing a glass fiber reinforced polypropylene material. The composition comprises the following components in parts by weight: 100 parts of polar monomer modified polypropylene; 1-30 parts of a compatilizer; 0.3-5 part of a toughening agent; and 25-100 parts of glass fiber. A foamed plate prepared by foaming the glass fiber reinforced polypropylene material prepared from the composition has the characteristics of smooth surface, compact cells, uniform cell diameter, closed-cell hard structure, good impact property and the like.

The invention provides a preparation method of antistatic polypropylene foam beads, comprising firstly obtaining polypropylene according to the following method, then using the obtained polypropylene as a matrix resin, adding carbon nanotubes as an antistatic agent, and using a physical foaming agent The polypropylene foamed beads are obtained by foaming; wherein, the preparation method of the polypropylene is: two or more stages of propylene polymerization are carried out in two or more reactors operated in series, and the two-stage reaction The external electron donors used are silane compounds and diether compounds respectively. The invention uses high-melt-strength polypropylene with wide molecular weight distribution as raw material and carbon nanotubes as antistatic agent to realize the stabilization of polypropylene raw material, effectively expand the foaming window, easy to adjust the process, and can prepare excellent performance Antistatic polypropylene foam beads are widely used in fields with high antistatic requirements, including aerospace, precision instruments, and electronic product packaging.