15 results about "Molding grade" patented technology

The invention discloses a low-temperature-impact-resistant wide-distribution injection molding grade polyethylene resin, and relates to the field of polyethylene. The polyethylene resin is composed of a high-molecular-weight polyethylene component and a low-molecular-weight polyethylene component, the melt index (MI2.16) of the polyethylene is 0.5-65 g / 10 min, the weight-average molecular weight range is 2 * 10 < 4 >-9 * 10 < 5 > g / mol, the molecular weight distribution is 2.5-50, the comonomer insertion rate is 0-10%, the impact strength at room temperature is 2-75 kJ / m < 2 >, and under the low-temperature condition of-60-0 DEG C, the melt index (MI2.16) of the polyethylene is 0.5-65 g / 10 min. The impact strength retention rate ranges from 70% to 99%. By controlling the blending distribution uniformity of the high-molecular-weight polyethylene component and the low-molecular-weight polyethylene component, the processing performance and the impact performance of the resin are balanced, and under the action of a flow field of an injection molding processing technology, the high-molecular-weight polyethylene component forms a longer-scale extended chain precursor; the low-molecular-weight component is filled in gaps of the high-molecular-weight polyethylene component to form a shish-kebab structure which is larger in size and more regular in structure, so that the aims of improving the impact strength and improving the impact strength retention rate at low temperature are fulfilled.

The invention relates to a yellowing test method of injection molding grade PVDF (Polyvinylidene Fluoride). The yellowing test method comprises the following steps: S1, preparing a PVDF sample strip from a PVDF material to be tested through an injection molding process; s2, the PVDF sample strip is placed in an aging test box to be subjected to aging treatment, the yellowing indexes YI0 and YI1 of the PVDF sample strip before and after aging are measured through a spectrocolorimeter, the yellowing index difference value YI = YI1-YI0 is obtained, and the injection molding grade PVDF yellowing degree is tested and evaluated. Compared with the prior art, the method has the advantages that the yellowing degree of the PVDF injection molded part can be accurately and objectively evaluated, and the testing efficiency and accuracy are improved, so that the yellowing performance of the PVDF material is better evaluated.

The application discloses a kind of high-temperature-resistant injection molding grade ultra-high molecular weight polyethylene composite material and modification method, it is related to composite material technical field, first with specific proportion fluorine-containing silane coupling agent, thermal initiator, crosslinking catalyst is mixed to ultra-high molecular weight polyethylene, then again with low molecular weight polyolefin flow modifier is compounded, the modification of high-temperature-resistant injection molding grade ultra-high molecular weight polyethylene composite material is realized.This method has the characteristics of simple process, low cost, mild reaction condition and wide application field, and has good development prospect.

The invention discloses a high-temperature-resistant injection molding grade ultra-high molecular weight polyethylene composite material and a modification method, and relates to the technical field of composite materials. Ultra-high molecular weight polyethylene is firstly mixed with a fluorine-containing silane coupling agent, a thermal initiator and a crosslinking catalyst according to a specific proportion, and then the mixture is compounded with a low molecular weight polyolefin flow modifier to obtain the high-temperature-resistant injection molding grade ultra-high molecular weight polyethylene composite material. The modification of the high-temperature-resistant injection molding grade ultrahigh molecular weight polyethylene composite material is realized. The method has the characteristics of being simple in process, low in cost, mild in reaction condition and wide in application field, and has a good development prospect.

The present application discloses a liquid corrosion-resistant composite spring water pipe for a sprayer, which comprises an inner layer, a middle layer and an outer layer co-extruded; the inner layer is a PVC layer, and the PVC layer comprises high-polymerization-degree PVC resin and CPVC resin with a mass ratio of 100:90-110; the middle layer is an adhesive layer, and the adhesive layer comprises injection molding grade PVC powder, polyester type TPU and CPE resin with a mass ratio of 100:22-28:14-16; the outer layer is a TPU layer, and the TPU layer is a polyether type TPU layer; it has good corrosion resistance and high temperature resistance, and improves the resilience and hydrolysis resistance of the water pipe.

The invention discloses injection molding grade aramid resin and a preparation method thereof, relates to the technical field of high polymer materials, and solves the problems of high processing difficulty and limited processing mode of the existing aramid resin. The preparation method comprises the following steps: suspending diacid containing a specific structure, diamine, a catalyst and a molecular weight regulator in a solvent, carrying out nitrogen displacement, stirring and heating to 120-150 DEG C, keeping the temperature for 1-2 hours, then heating to 200 DEG C, starting exhausting when the pressure is 1.5-2.0 MPa, keeping the pressure constant, discharging the solvent until the solid content is 80-95%, stopping exhausting, and reacting for 2-3 hours; cooling to room temperature and discharging; then crushing, placing in a drying oven, vacuumizing to-0.098 to-0.1 MPa at 150 DEG C, keeping for 3 hours, heating to 220 to 240 DEG C, keeping for 3 to 4 hours, continuously heating the crystallization system to 250 to 320 DEG C, reacting for 1 to 3 hours, and cooling to obtain the aramid resin. The method can be applied to precise injection molding production of electronic packaging, aerospace parts and the like.

The invention discloses a self-repairing PVC-U injection molding grade modified material and a control method, the self-repairing PVC-U injection molding grade modified material comprises a base material and a self-repairing microcapsule, the base material comprises the following components by mass: 80 parts of PVC resin; 20 parts of PVC with an ultralow polymerization degree; 5 parts of a calcium-zinc stabilizer; 1 part of a lubricant; 2 parts of ACR resin; 10 to 15 parts of nano calcium carbonate; the content of the self-repairing microcapsule is 5 to 10 weight percent. According to the invention, the material with the self-repairing effect can be obtained, so that the subsequently produced product has a certain self-repairing effect.

The invention discloses a polylactic acid composite material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The polylactic acid composite material is prepared from the following components in parts by weight: 54 to 91 parts of polylactic acid, 10 to 45 parts of talcum powder and 1 to 20 parts of poly (butylene succinate), the polylactic acid meets the following conditions: 2.8 < = X / D < = 22, and X is the content of terminal carboxyl groups in the polylactic acid, mol KOH / t; d is the polydispersity coefficient of polylactic acid. A specific amount of talcum powder and PBS are added into the polylactic acid, and the content of terminal carboxyl groups of the polylactic acid and the polydispersity coefficient are controlled to meet a specific relationship, so that the obtained polylactic acid composite material has good damp-heat aging resistance, for example, the tensile strength retention rate is greater than 60% when the polylactic acid composite material is accelerated to age for 6 h under the conditions that the temperature is 85 DEG C and the humidity is 85%; the material is suitable for extrusion-grade or injection-molding-grade product materials with high requirements on damp-heat aging resistance.

The invention relates to an injection molding grade nylon 6 slice and a preparation method and application thereof, and relates to the technical field of new materials. According to the injection molding grade nylon 6 slice, monobasic acid is added as a molecular weight stabilizer in the caprolactam hydrolysis ring-opening polymerization process, the finally prepared slice has better viscosity stability, and the flowing property of a nylon melt is improved.

The invention discloses a blown wear-resistant packaging film for a liquid packaging bag, a preparation method of the blown wear-resistant packaging film and the liquid packaging bag, and belongs to the technical field of packaging film preparation, the blown wear-resistant packaging film comprises a film body sequentially composed of an outer layer, a middle layer and an inner layer from outside to inside, and the blown wear-resistant packaging film is characterized in that the outer layer is prepared from 8-10 parts by mass of blow molding grade TPU and 0.5-1.5 parts by mass of a slipping agent; the middle layer is prepared from 8.5-10.5 parts by mass of first metallocene linear low-density polyethylene and 0.3-0.7 part by mass of PPA, the inner layer is prepared from 5-7 parts by mass of second metallocene linear low-density polyethylene, 1-2 parts by mass of first low-density polyethylene, 0.3-0.7 part by mass of PPA, 0.5-1.5 parts by mass of an anti-blocking agent and 0.5-1.5 parts by mass of a slipping agent, the mark of the first metallocene linear low-density polyethylene is XP8784ML, and the mark of the second metallocene linear low-density polyethylene is XP8784ML. The second metallocene linear low-density polyethylene has a lateral first long-chain branch, and the first low-density polyethylene has a lateral second long-chain branch. On the premise of meeting the high mechanical property requirement of the liquid bag, the film can be blown into the film, and the wear resistance of the film is greatly improved.

The invention relates to the technical field of wood-plastic composite materials, and particularly discloses an injection molding grade high-corrosion-resistance wood-plastic composite material and a preparation method thereof.The injection molding grade high-corrosion-resistance wood-plastic composite material is prepared from, by weight, 43-75 parts of waste plastic, 10-25 parts of wood flour, 12-18 parts of pitaya peel particles, 3-7 parts of talcum powder and 4-6 parts of light calcium carbonate powder. 5-9 parts of chitosan, 2-8 parts of a coupling agent, 3-5 parts of an adhesive and 1-2 parts of an antioxidant. The injection molding grade wood-plastic composite material with high corrosion resistance, which has the characteristics of excellent injection molding property, high rigidity, high corrosion resistance, mechanical property and the like, is developed by modifying two mixed fillers, namely the pitaya peel particles and the wood flour, with a specific chitosan surface accelerant and mixing with a waste plastic matrix.

The invention discloses a scratch-resistant blow molding grade TPO (thermoplastic polyolefin) elastomer with smooth hand feeling and a preparation method of the scratch-resistant blow molding grade TPO elastomer. The TPO elastomer is prepared from the following components in parts by weight: 40 to 60 parts of polypropylene, 20 to 35 parts of ethylene propylene rubber, 5 to 15 parts of thermoplastic polyurethane, 2 to 5 parts of nano aluminum oxide, 1 to 3 parts of silicone master batch, 0.1 to 0.3 part of dynamic vulcanizing agent, 2 to 4 parts of compatilizer, 0.2 to 0.5 part of antioxidant and 0.1 to 0.3 part of light stabilizer. The preparation method comprises the following steps: carrying out surface modification on the nano aluminum oxide, pre-mixing the components, and carrying out dynamic vulcanization blending and granulation at a specific temperature and a specific rotating speed by using a double-screw extruder. Through multi-component cooperation and a dynamic vulcanization process, the material has excellent surface smooth hand feeling (the static friction coefficient is less than or equal to 0.4) and scratch resistance (the pencil hardness is greater than or equal to 3H) while keeping high toughness and high elasticity, and is particularly suitable for blow molding products with high requirements on touch feeling and surface durability, such as automotive interiors and household appliance shells.

The invention discloses a micro-pressure manned (oxygen) cabin body formed at a time based on a rotational molding process, and belongs to the technical field of medical care equipment. The cabin body is of a hollow structure integrally formed through a rotational molding process, rotational molding grade composite plastic (polyethylene and the like) is selected as a main body material, and the wall thickness is 3-10 mm and is uniform. And a reinforcing rib structure integrally formed with the main body is arranged inside or outside the cabin body. The cabin body is provided with a cabin door frame with a sealing structure, an air inlet connector, an exhaust connector and an observation window installation hole. The cabin body is integrally formed through the rotational molding process, no splicing seam exists, the structural strength is high, and the air tightness is excellent; the plastic material enables the cabin body to be light in weight and resistant to corrosion; the structural stability is further improved through the reinforcing rib design; production efficiency is high, cost is low, and the inner wall is smooth and convenient to clean. The micro-pressure manned (oxygen) cabin effectively overcomes the defects that an existing micro-pressure manned (oxygen) cabin is low in structural strength, low in air tightness, large in weight, prone to corrosion, high in cost, low in production efficiency and the like, and is applied to the health fields of relieving altitude stress, improving human body microcirculation, relieving fatigue, promoting rehabilitation and the like.

The present invention discloses a non-woven bag detection method and system, which matches the molding logic of the non-woven bag according to the shape type of the non-woven bag, so as to introduce the molding logic of the non-woven bag, thereby controlling the molding of the non-woven fabric based on the molding logic of the non-woven bag, and outputting the non-woven bag. At the same time, the detection image of the non-woven bag is collected, and a plurality of areas are divided based on the detection image; corresponding features are determined according to the identification of the plurality of areas, so as to define a correlation coefficient based on the association of the plurality of features, and trigger a combination of the plurality of features according to the correlation coefficient, so as to control the feature combination, so as to match the molding coefficient based on the feature combination, and define the molding grade according to the molding coefficient, and define the overall grade of the non-woven bag according to the plurality of molding grades and the material grade of the non-woven bag, thereby ensuring the molding effect of the non-woven bag, and at the same time, facilitating the control of each molding node of the molding logic of the non-woven bag.

The application discloses an injection molding grade flame-retardant metal polymer composite material and a preparation method and application thereof. The composite material comprises the following components in parts by weight: 28-42 parts of polyolefin resin; 20-30 parts of metal iron powder; 15-25 parts of bromine flame retardant; 5-10 parts of inorganic magnesium compound; and 1-5 parts of interface modifier. The interface modifier is maleic anhydride graft and / or acrylic acid graft. In the application, the polyolefin resin is used as the base resin, the metal iron powder is added, the bromine flame retardant and the inorganic magnesium compound are used in cooperation, the good flame-retardant effect can be achieved, and the good magnetic strength and metal luster are also achieved.