124results about How to "Good nucleation effect" patented technology

The invention discloses a polyformaldehyde composition and a preparation method thereof. The polyformaldehyde composition contains by part of weight: 100 parts of acetal resins, 0.01-2 parts of oxidation inhibitors, 0.01-2 parts of formaldehyde catching agents, 0.01-2 parts of formic acid catching agents and 0.01-5 parts of crosslinking acetal resins. Compared with the prior art, the crosslinking acetal resins serve as nucleating agents and are obvious in nucleating effects, and a great number of crystal nucleuses are formed before crystallization of the acetal resins, so that crystallization of the acetal resin is induced, the number of the crystal nucleuses is improved, crystallization degree and temperature are improved, sphaerocrystal dimension is lowered, and accordingly crystallization structure of the acetal resin is improved. Further, due to the fact that the adding amount of the crosslinking acetal resins is small, and bad influence on mechanical property, thermal performance and surface morphology of the polyformaldehyde composition is avoided. Experiment results prove that the sphaerocrystal dimension of the polyformaldehyde composition is about 40 mu m, and the polyformaldehyde composition has good crystalline structure and good mechanical property.

The invention relates to a biodegradable material containing aliphatic polycarbonate, and a preparation method and an application thereof. The biodegradable material is obtained by the following steps of mixing 20-90 parts by weight of aliphatic polycarbonate, 10-80 parts by weight of aliphatic polyester, 0.01-1 part by weight of an organic peroxide, 0.05-1 part by weight of a cross-linking agent, 3-15 parts by weight of a compatilizer, 0.3-5 parts by weight of a plasticizer, 0.1-5 parts by weight of a heat stabilizer and 0.01-1 part by weight of an auxiliary agent uniformly; adding the above mixture in a double-screw extruder for melt blending, stretching the blended mixture into strips; pelletizing the strips to obtain granular mixing resin slices; and vacuum drying the slices and removing water from the slices. The biodegradable material can be used for preparing completely biodegradable film which has various excellent performances of conventional films, can keep relatively good transparency, has relatively high tensile strength, can provide high toughness and tearing strength, and has good thermal stability, etc.

The invention relates to a preparation method of a beta crystalline polypropylene resin. The method comprises: adding a dry polypropylene beta crystalline form nucleating agent into a bulk polymerization reaction kettle or a slurry polymerization reaction kettle loaded with propylene, utilizing the Ziegler-Natta catalyst system to catalyze propylene for its bulk polymerization or slurry polymerization, thus obtaining composite powder of polypropylene and the polypropylene beta crystalline form nucleating agent; subjecting the obtained composite powder directly to heating and melting treatment or extrusion pelletization by an extruder, thus obtaining the beta crystalline form polypropylene resin. The beta crystalline form polypropylene resin prepared by the method of the invention has obvious advantages in terms of impact resistance, flexural strength, flexural modulus, tensile yield strength and heat resistance, etc., and particularly, the substantial enhancement of the impact resistance can make the beta crystalline form polypropylene resin prepared in the kettle applied in high-end application fields such as automobiles, batteries and the like.

The invention discloses an efficient polylactic acid nucleating agent, and a preparation method and application thereof and belongs to the technical field of crystallization and modification of polylactic acid. The prepared nucleating agent is a lamellar submicron zinc citrate complex, and is generated by heating zinc salt and citric acid in a mixed solution of water and ethanol and performing reflux reaction. A small amount of the nucleating agent and polylactic acid are mixed in advance and then are fused, blended and molded so as to obtain a polylactic acid product which is highly crystallized and has excellent heat resistance. The prepared nucleating agent has high safety for a human body and an obvious nucleating effect; and a process is simple and environment-friendly, the problems of low crystallization rate and heat resistance of the polylactic acid are solved, the forming processability of the polylactic acid product is improved, and a production cycle is shortened.

The invention discloses a composite flocculant for treating printing and dyeing wastewater. The composite flocculant for treating the printing and dyeing wastewater is prepared from the following rawmaterials in parts by weight: 15-25 parts of activated carbon fibers, 4-11 parts of acrylamide, 2-9 parts of sodium carboxymethyl cellulose, 5-17 parts of polyvinyl alcohol, 3-6 parts of a crosslinking agent, 0.003-0.006 part of an initiator, 3-5 parts of a polyethyleneimine-cellulose composite material, 10-15 parts of starch xanthate and 25-36 parts of modified bentonite. The composite flocculantprovided by the invention does not contain components which are complicated, have radiation and easily cause secondary pollution, all the used raw materials are natural, environment-friendly, low inprice and easy to obtain, the preparation method is simple, the feeding amount is small, the composite flocculant has multiple effects of flocculation sedimentation, adsorption decolorization, deodorization and the like, the sedimentation rate is high, the removal rates of organic matters, dye molecules and heavy metals are high, the structure and properties are stable, and the application range is wide.

The invention relates to the technical field of 3D printing materials, in particular to a preparation method of a medical polylactic acid modified calcium phosphate bone cement composite 3D printing material. The preparation method of the medical polylactic acid modified calcium phosphate bone cement composite 3D printing material comprises steps as follows: S1, preparation of modified hectorite;S2, preparation of rare earth modified calcium phosphate powder; S3, preparation of the medical polylactic acid modified calcium phosphate bone cement composite 3D printing material. The composite obtained with the preparation method of the medical polylactic acid modified calcium phosphate bone cement composite 3D printing material has excellent printing performance and outstanding application performance, has the advantages of excellent mechanical strength, mechanical performance and compressive strength and has the mechanical strength of inorganic calcium phosphate materials and flexibilityof polymer polylactic acid materials, and besides, the preparation process is simpler and lower in production cost.

The invention discloses a calcium-carbonate-supported nucleating agent used for poly(lactic acid) crystallization and a preparation method thereof. The nucleating agent comprises the following composition formula: calcium carbonate and phenylphosphonic acid at a weight ratio of (5-40): 1, wherein calcium phenylphosphate generated by reaction of phenylphosphonic acid and calcium carbonate is used as an active ingredient and loaded on the surface of calcium carbonate, and phenyl phosphonic acid has a structural formula shown in the invention, in the formula, R1 and R2, the same or different, represent hydrogen atom, C1-10 alkyl or C1-10 alkoxycarbonyl. The nucleating agent can increase the effective nucleation sites formed by the high-degree dispersion of calcium phenylphosphate on the surface of calcium carbonate, thereby increasing nucleation efficiency as well as strengthening and toughening poly(lactic acid), avoiding the problem that poly(lactic acid) has poor toughness caused by non-supported nucleating agents, and facilitating the wide application of poly(lactic acid). The nucleating agent has a simple preparation method, low consumption of phenylphosphonic acid and significantly low cost.

The invention discloses a lignin-based biodegradable polymer composite film which is prepared from the following raw materials in parts by weight: 100 parts of a biodegradable polymer material, 5-30 parts of lignin and 0.2-6 part of caprolactone. The invention also provides a preparation method of the lignin-based biodegradable polymer composite film. The preparation method has the advantages thatthe prepared lignin-based biodegradable polymer composite film is high in tensile strength and tear strength, resistant to ultraviolet radiation, flame-retardant, simple in preparation process, low-carbon, environment-friendly, high in production efficiency and easy to industrialize.

The invention discloses a ludox graft-modified organic phosphate nucleator preparation method, which includes steps of adding 2,2'-methylene-di(4, 6-Di-tert-butylphenol) phosphorus acyl chloride solution into lodox, and then extracting, filtering and drying the mixture to obtain white powder which is ludox graft-modified organic phosphate nucleator after sufficient reaction. Compared with the prior art, the ludox graft-modified organic phosphate nucleator has the advantages that under the action of steric hinderance, dispersity of the ludox graft-modified organic phosphate nucleator in plastics including polyethylene, polypropylene and the like is increased, crystallizing temperature is also increased and haze is reduced. Further, The ludox graft-modified organic phosphate nucleator has better mechnical performance and has better nucleating effect as compared with existing commonly-used NA-11 and NA21 nucleator.

The invention provides a high-anti-impact, high-rigidity and high-shrinking rate polypropylene modified material and a preparation method thereof. The material includes, by weight, 40-90 parts of polypropylene resin, 5-30 parts of spherical silicon, 5-15 parts of a toughener, 0.1-2 parts of a nucleating agent, 0.2-0.4 parts of a main anti-oxygen agent and 0.2-0.4 parts of an assistant anti-oxygenagent. By selecting the proper polypropylene resin, elastomer and inorganic filler, the material is improved in both anti-impact strength and shrinking rate, so that the material is guaranteed in sizeand physical properties in a product with large mold-opening shrinking rate.

The invention relates to a modified polypropylene plastic and a preparation method thereof. Raw materials of the modified polypropylene plastic comprise isotatic polypropylene and a composite nucleating agent; the composite nucleating agent consists of an inclusion complex of cyclodextrin and a derivative thereof and a synergist, and the synergist is suberate. Compared with a common polypropylene plastic, the modified polypropylene plastic has obvious advantages on properties such as impact resistance, and meanwhile has the advantages of simplicity in preparation, high production efficiency and the like.

The invention relates to an alterant for ball milling cast iron, in particular to the composite alterant for the nickel aluminum molybdenum-silicon iron alloy loaded nano-aluminum-silicon oxide ball milling cast iron and a preparation method thereof. The alterant is prepared from the following raw materials, by weight, of 2-3 parts of nano-alumina, 1-2 parts of potassium fluoborate, 2-3 parts of nickel powder, 1-2 parts of aluminum powder, 1-2 parts of molybdenum powder, 0.2-0.4 part of oxidized graphene, 1-2 parts of nano silica, 3-5 parts of expanded graphite powder, 1-2 parts of monazite micro powder, 4-5 parts of ferrosilicon powder with the silicon content being 45%, 0.3-0.4 part of magnesium aluminosilicate, 20-25 parts of ethanol aqueous solutions with the concentration being 5%-10% and 0.4-0.5 part of an addition agent. Nano composite powder bodies and a nickel aluminum molybdenum-silicon iron alloy which are loaded by expanded graphite powder are bonded and loaded mutually to prepare the composite alterant with stable performance. The alterant is stable in high temperature, the nucleating effect is good, and graphite spheroidization is stable and durable. According to the alterant, the graphitizing process is facilitated, the structural organization is improved, strength and abrasion resisting are further improved, and compared with a traditional alterant, using is more convenient and faster, and the additional production cost is reduced.

The invention relates to a hydrotalcite-containing stiffening nucleating agent composition and also relates to a thermoplastic plastic containing the nucleating agent composition and particularly relates to nylon containing the nucleating agent composition. The nucleating agent composition contains di-[4-tert-butyl benzoic acid]hydroxyl aluminium in a weight ratio of (5:1)-(1:5). The nucleating agent composition has a better nucleating effect, and the obtained nylon product has high tensile and bending strength, low loss of impact strength, good heat resistance and the like. By adopting the nucleating agent provided by the invention, the demoulding property in the nylon processing process is improved, the injection moulding cycle is shortened, and the production efficiency is improved; and moreover, the dimensional stability of the product is higher, the shrinkage is reduced, and the mechanical properties, product transparency and heat-resistance temperature of the product are improved.

The invention relates to polyethylene glycol magnesium and a preparation method and application thereof. The chemical structure of the polyethylene glycol magnesium is shown in the specification. The preparation method for the polyethylene glycol magnesium comprises the following steps of: mixing polyethylene glycol and magnesium, heating and carrying out a reaction on the mixture, and continuously removing steam produced during the reaction to promote the generation of products; and removing residual water and residual polyethylene glycol from a reactant solution by using a vacuum pressure-reduction distillation process, taking a final product out and cooling, crystallizing at room temperature and leaching, washing and drying, and finally obtaining white crystalline particles which are the polyethylene glycol magnesium. A polyethylene terephthalate (PET) nucleating agent is provided, and is smelted and mixed with PET during squeezing of a screw, so that the flexibility of a PET chain section is improved, and the glass transition temperature and the cold crystallization temperature of the PET are reduced; furthermore, the dispersion activation capacity of the PET chain section is reduced, so that the PET chain section does dispersive motion towards the surface of a crystal nucleus, and is arranged neatly; and therefore, a function of accelerating the PET crystallization rate is realized.

The invention relates to a method for toughening heat-resistant modified polylactic acid with a plant-base composite environment-friendly modifier, which comprises the following steps: removing water from the raw material vegetable oil; proportionally adding polybasic acid/acid anhydride and a nucleating agent, and heating to 140-160 DEG C in an N2 atmosphere to react for 2-8 hours; adding a certain amount of dehydrated lactic acid or lactide, continuing reacting at 140-160 DEG C in the N2 atmosphere for 1-2 hours, heating to 170-190 DEG C to react for 2-10 hours, and vacuumizing the system; and extruding the prepared plant-base environment-friendly modifier polymer and polylactic acid by an equidirectional double screw extruder, blending, drawing, cooling with water, granulating, and drying to obtain the modified polylactic acid granules. Compared with the prior art, the modified polylactic acid granules have the advantages of no toxicity or harm, no harm to the environment and human health and favorable compatibility, and can be completely biodegraded. Besides, the polylactic acid modified by the modifier has favorable heat resistance.

The invention provides a nucleating agent modifying and preparing method of high-performance polypropylene. The method, under a circumstance of not changing polymerization conditions, can modify a nucleating agent or adopt special feeding ways to shield deactivated components after poisoning of a catalyst, so that active ingredients of the nucleating agent are completely released in reaction nucleating and polymerizing processes to the greatest extent; functional group of the modified nucleating agent is free from adverse effect on activity of a main catalyst and free from reaction with a catalyst promoter and an electron donor, so that catalytic activity is basically not reduced, and the modified polypropylene is excellent in performance and obvious in nucleating action in a kettle; the prepared polypropylene is high in comprehensive performance.

The invention discloses a poly1-butylene nucleating agent composition. The poly1-butylene nucleating agent composition comprises 9,10-dihydro-9,10-ethylene-anthracene-11,12-disodium salt (DHEAS) and derivatives thereof. By adopting the poly1-butylene nucleating agent composition, the nucleating capability can be improved well, a glass transition temperature of poly1-butylene is increased, and the poly1-butylene nucleating agent composition has the advantages of low usage amount, low cost, simple preparation technology and the like, so that the poly1-butylene nucleating agent composition is an ideal poly1-butylene nucleating agent. The structural formula of the poly1-butylene nucleating agent composition is described in the specification.

The invention discloses a modified polypropylene resin and a preparation method thereof. The modified polypropylene resin comprises polypropylene resin and a modification assistant and the polypropylene resin and the modification assistant are mixed. The modification assistant is a microemulsion of a liquid anti-oxidant and a binary composite nucleating agent. The binary composite nucleating agent comprises silica and 2,2'-methylene-di(4,6-di-n-butylphenol)phosphoric acid sodium and a weight ratio of silica to 2,2'-methylene-di(4,6-di-n-butylphenol)phosphoric acid sodium is in a range of 95: 5 to 5: 95. The preparation method comprises that the above ingredients are subjected to melt blending according the above use amount ratio so that the modified polypropylene resin is obtained. The modified polypropylene resin has obviously improved polypropylene crystallinity and greatly improved mechanical properties.

The invention discloses a soft high-temperature-resistant polypropylene foam material and a preparation method thereof. The soft high-temperature-resistant polypropylene foam material comprises 100 parts of co-polypropylene resin, 10-20 parts of polyolefin block copolymer resin, 5-15 parts of high-density polyethylene resin, 1-3 parts of low-molecular-weight polytetrafluoroethylene and 1-4 parts of a foaming agent. The method comprises the following steps of: melting and mixing copolymerized polypropylene resin, polyolefin block copolymer resin, high-density polyethylene resin, a foaming agentand low-molecular-weight polytetrafluoroethylene, and extruding from an extruder to obtain a sheet; and sequentially feeding the cross-linked sheet into a preheating section, a foaming section and acooling shaping section of equipment for foaming to obtain the foam material. The soft high-temperature-resistant polypropylene foam material is low in compression set and low in compression strength,so that the foam material is soft enough; meanwhile, under the high-temperature condition, the heat-resistant dimension change rate (transverse/longitudinal) reaches -0.8%/-1.4%, and the foam material has both softness and heat resistance.

The invention discloses a device and a method for efficiently removing fine particulate matters through temperature and humidity regulation and control. A box body structure with the same cross section structure size is adopted; the main body channels are arranged in series in a manner that flow channel center lines coincide; efficient removal of the particles with large and small particle sizes is achieved step by step in a regional mode through the forms of front-stage negative direct current pre-dedusting, primary flue gas temperature and humidity regulation and control, acoustoelectric coupling coagulation, secondary flue gas temperature and humidity regulation and control and rear-stage negative direct current dedusting in combination with gravity settling, filtering and trapping effects, condensation nucleation effects and acoustoelectric coupling effects for enhancing the collision coagulation effect of the fine particles. Local regulation and control of the flue gas temperatureand step-by-step humidification of the humidity are achieved through the series connection effect of the two-stage flue gas temperature and humidity regulation and control dust collection areas and the coupling effect of acoustic agglomeration and pulse electrocoagulation; meanwhile, the partition electrocoagulation effect of particulate matter with different particle sizes is achieved, and the trapping and removing effect of fine particulate matter is enhanced through the ash removal and dust collection effects of the movable grid plate and the movable electrode plate, and the removing efficiency of the fine particulate matter is high.

The invention relates to a polyester composition and a preparation method thereof; the polyester composition is prepared from poly-1,4-cyclohexane dimethylene terephthalate (PCT) resin, glass fiber, nucleating agent A, nucleating agent B, a flexibilizer, an antioxidant, a lubricant and an additive. The poly-1,4-cyclohexane dimethylene terephthalate (PCT) resin has number-average molecular weight of 25000 to 30000; the nucleating agent A is sodium carboxylate organic small-molecular nucleating agent, having molecular weight of 100-200 g/mol; the nucleating agent B is an ionic polymer salt nucleating agent. The polyester composition has higher crystallizing rate so that a material takes short time to form, time cost of product processing is saved, crystallizing rate is largely increased, and the comprehensive properties of the material, such as impact property, bending performance, and thermal deformation temperature tolerance, can be better improved.