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

The present invention provides a preparation method of a polypropylene foaming plate or sheet. According to the preparation method, high melt strength homopolymerization polypropylene is adopted as a matrix resin and a foaming agent is adopted to foam to prepare the polypropylene foaming plate or sheet, wherein the homopolymerization polypropylene preparation method comprises: in two or more than two reactors having the series connection operation, carrying out a two-stage or multi-stage propylene homopolymerization reaction, wherein the external electron donors used in the two-stage reaction are respectively a silane compound and a diether compound. According to the present invention, the high melt strength polypropylene having the wide molecular weight distribution is adopted as the raw material to achieve the stabilization of the polypropylene raw material, such that the foaming window is effectively expanded, the process is easy to adjust, the polypropylene foaming plate or sheet having the smooth self-skinning, the uniform foam hole diameter, the closed hole rigid structure, the density of 0.2-0.9 g / cm<3> and the thickness of 0.1-400 mm can be prepared, and the polypropylene foaming plate or sheet can be widely used in the fields of heat-insulation tableware, automotive interiors, building templates, camping supplies, decoration material sandwiches, product vibration reduction packaging and the like.

The invention relates to a process method for quenching and tempering heat treatment of steel rods by induction heating. Process, the specific process is: straightening, quenching, tempering, cooling and straightening, blanking inspection, and storage. Beneficial effects of the invention: use the thermal effect of induction eddy current to carry out quenching and tempering heat treatment on steel, so that the core structure is a uniform tempered sorbite structure; no pre-heating heating is required, and the temperature rises rapidly; length-length material processing can be performed.

The invention provides a composition for preparing a polypropylene foaming material. The composition comprises high melt strength impact polypropylene, and the high melt strength impact polypropylene comprises a random copolymerization polypropylene continuous phase and a propylene-ethylene copolymer rubber dispersion phase. The content of room temperature dimethylbenzene solvend is larger than or equal to 10 wt%, and smaller than or equal to 35 wt%. The ratio of room temperature Mw of trichlorobenzene solvend to Mw of room temperature trichlorobenzene insoluble is larger than 0.4 and smaller than or equal to 1. The invention further provides a polypropylene injection foaming forming body made of the composition by injection foaming and a preparation method thereof. The forming body is suitable for the fields having special requirements for shapes, such as automobile, aircraft and high-speed rail inside and outside decoration components and the like.

The invention provides a polypropylene foamed bead. The foamed bead is prepared by foaming a base resin high-melt-strength polypropylene with a foaming agent, wherein the high-melt-strength polypropylene has the following characteristics: the melt index MFR is 0.2-10 g / 10 minutes, the molecular weight distribution Mw / Mn is 6-20, the content of substances with the molecular weight of greater than 5 million is greater than or equal to 0.8 wt%, the M[z+1] / Mn is greater than or equal to 70, and the ethylene content is 0.1-20 wt%. The high-melt-strength polypropylene with wide molecular weight distribution is utilized as the raw material to implement stabilization of the polypropylene raw material, so that the foaming window is effectively enlarged, the technique is easy to adjust, and the cost is low; the method can be used for preparing the polypropylene foamed bead with the density of 0.02-0.3 g / cm<3>, which has the advantages of uniform pore diameter, compact pores, uniform pore size distribution and close-pore structure; and the polypropylene foamed bead can be widely used in the fields of thermal insulation tableware, automobile interior ornaments, architectural moldboards, camping supplies, decorating material interlayers, product damping packages and the like.

The invention provides a polypropylene foamed bead. The foamed bead is prepared by foaming a base resin high-melt-strength polypropylene with a foaming agent, wherein the high-melt-strength polypropylene has the following characteristics: the melt index MFR is 0.2-10 g / 10 minutes, the molecular weight distribution Mw / Mn is 6-20, the content of substances with the molecular weight of greater than 5 million is greater than or equal to 0.8 wt%, the M[z+1] / Mn is greater than or equal to 70, and the butylene content is 0.1-15 wt%. The high-melt-strength polypropylene with wide molecular weight distribution is utilized as the raw material to implement stabilization of the polypropylene raw material, so that the foaming window is effectively enlarged, the technique is easy to adjust, and the cost is low; the method can be used for preparing the polypropylene foamed bead with the density of 0.02-0.3 g / cm<3>, which has the advantages of uniform pore diameter, compact pores, uniform pore size distribution, closed cell structure and lower content of n-hexane extract; and the polypropylene foamed bead can be widely used in the fields of thermal insulation tableware, automobile interior ornaments, architectural moldboards, camping supplies, decorating material interlayers, product damping packages and the like.

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 preparation method of polypropylene foamed beads, which comprises the following steps: firstly obtaining polypropylene according to the following method, then using the obtained polypropylene as matrix resin, adding organic peroxide and foaming with a physical foaming agent to prepare The polypropylene foamed beads; wherein, the preparation method of the polypropylene is: in two or more reactors operated in series, two or more stages of propylene polymerization are carried out, and an external electron donor used in the two-stage reaction is carried out. The compounds are silane compounds and diether compounds, respectively. The invention uses high melt strength polypropylene with wide molecular weight distribution as raw material and organic peroxide as the surface modifier of EPP beads, and can prepare uniform cell diameter, dense cell, uniform cell distribution and closed cell structure. The polypropylene expanded beads are widely used in automobile manufacturing, packaging, building insulation, sports equipment, daily necessities and aerospace and other fields.

The invention provides a polypropylene foamed sheet and a preparation method therefor. The foamed sheet is prepared by taking impact-resistant polypropylene with high melt strength as base resin and carrying out foaming and rolling, wherein the impact-resistant polypropylene with high melt strength contains a propylene homopolymer ingredient and an ethylene-1-butylene copolymer ingredient, and the ratio of Mw of room-temperature trichlorobenzene soluble matters of the impact-resistant polypropylene with high melt strength to Mw of room-temperature trichlorobenzene insoluble matters of the impact-resistant polypropylene with high melt strength is greater than 0.5 and smaller than or equal to 1; and the content of room-temperature dimethylbenzene soluble matters in the impact-resistant polypropylene with high melt strength is higher than 10wt% and lower than 30wt%. The polypropylene foamed sheet provided by the invention has the advantages of smooth surface, uniform bubble and pore size distribution, good high- / low-temperature impact resistance, high melt strength and the like and can be extensively applied to the field of automotive parts, food and electronic packages, architectural decoration and the like; and the preparation method for the polypropylene foamed sheet is simple and is easy in operation and low in cost.

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.