65 results about "Chain propagation" patented technology

The invention discloses a side chain functional polymer and a preparation method thereof. A polymerization system consists of a monomer, an initiator, a chain transfer agent, a catalyst, a coordination agent and a coupling component, wherein the monomer is undecyl azidomethacrylic ester; the catalyst is copper; the coordination agent is N,N,N',N'',N''-pentamethyldiethylenetriamine; the coupling component is 4-methyoxyl-4'-propynyloxy azobenzene; single electron transfer (SET) is adopted for initiation to produce a free radical; polymerization reaction of the monomer is performed by a method for performing chain propagation in a reversible addition fragmentation chain transfer (RAFT) mode; meanwhile, click chemical reaction is performed; and monovalent copper is used for catalyzing an azide group and an alkynyl group in the coupling component to perform cycloaddition reaction so as to obtain the side chain functional polymer. Since the SET-RAFT method and the click chemical method are combined, the side chain functional polymer can be obtained by only one-step reaction; and thus, the reaction steps are reduced, the waste rate of the raw materials is reduced, rational utilization ofthe resources is realized, side reaction is basically avoided, and troublesome purification operation is avoided.

The invention discloses a synthesis technology of single-component water-based polyurethane finishing agent, which is characterized in that polyether glycol, toluene diisocyanate, cross-linking agent and the like are taken as the main row material and are prepared into stable self cross-linking and self-emulsifying type -component water-based polyurethane finishing agent through prepolymerization, chain propagation, quaternization, emulsification and the like. By adopting the invention, the film is water-resistant and has good the heat resistance, and the coating is abrasion and dry resistant and has good wet rubbing fastness, so that the finishing requirements of high-grade leather such as sofa leather and the like can be satisfied.

A native protection storage operating system (PSOS) process receives a request specifying an operation having security related implications for elements in the PSOS having a first set of components handling data transfer operations and a second set of components handling configuration operations. A security component stores an identifier of the requester and a security related information element locally within a storage location of the first or second set of components, and accesses, upon receiving the request, the security related information element and requester identifier to match other elements of the network impacted by the request, and performs a security condition specific check to determine whether or not the request is to be allowed or denied. The native process eliminates a need for caching, locking, and chain propagation of the security related information through the PSOS.

The invention relates to a biodegradable spandex for paper diaper, which comprises biodegradation promotion composition and spandex for paper diaper, wherein the biodegradation promotion composition includes potassium dodecyl phosphate, sodium lauroyl glutamate and UV-320. The preparation method of the biodegradable spandex for paper diaper comprises the following steps: 1) enabling oligomer diol to react with diisocyanate to generate prepolymer; 2) performing chain propagation reaction to the prepolymer through amine chain extender, to obtain polymer stock solution; 3) adding the biodegradation promotion composition to the polymer stock solution, and adding an antioxidant, a delustering agent and a lubricant, fully stirring, to obtain spinning stoack solution; and 4) performing dry-process spinning to the spinning stock solution to prepare the biodegradable spandex for paper diaper. The biodegradable spandex for paper diaper has high biodegradation speed, excellent adhesion effect with base materials, and smooth unwinding property.

The present invention relates to a fluorine-containing polyether grafting modified waterborne polyurethane, the preparation and the application thereof, a structural general formula of polyurethane is as the formula, wherein, R1 is equal to a polyurethane soft-segment polyol structure, R2 is equal to a polyurethane hard-segment isocyanate structure, R3 is equal to a polyurethane hard-segment chain extender structure, R4 is equal to the fluorine-containing polyether; X is equal to NH and O; the preparation is that: the polyol and the isocyanate react to compound the polyurethane prepolymer, then the waterborne polyurethane are obtained through the chain propagation of a chain extender, then the waterborne polyurethane and the fluorine-containing polyether are carried out a grafting reaction in the big molecules, so as to synthesize the fluorine-containing polyether grafting modified waterborne polyurethane; the application is that: the present invention can be applied to aerospace, aviation, automobiles, electronics, textiles, carpets, leathers, paper making, packaging, washing, machinery, construction and other fields. The present invention adopts the water as the solvent and has no formaldehyde, no or low VOC emission, no bioaccumulation and no toxicity, which is a multifunctional, green, environment protective, water-proof and dirt-proof coating layer and fabric finishing agent.

The invention relates to the field of shoes, and discloses a female shoe with an anti-aging sole and a preparation process thereof. Thefemale shoe with an anti-aging sole comprises a vamp and a sole,wherein the sole comprises the following raw materials in parts by weight: 40-60 parts of butadiene rubber, 5-6 parts of ethylene propylene diene monomer, 1-2 parts of acrolein, 1-2 parts of zinc borate, 3-5 parts of liquid sodium abietate, 1-2.5 parts of a vulcanizing agent, and 0.6-0.8 part of an accelerant. The preparation process comprises the following steps of mixing raw materials, conducting vulcanization, and forming a female shoe. The process has the following advantages and effects that the blended ethylene propylene diene monomer and butadiene rubber have good weather resistance, heat resistance and acid and alkali resistance; butadiene rubber containing double bonds is easily subjected to chain propagation reaction with acrolein, ethylene propylene diene monomer and the like, so that the bonding density among the components is improved, and the anti-aging performance is improved; after zinc borate and liquid sodium abietate are mixed, the problems that the content of doublebonds is increased due to addition of butadiene rubber and acrolein, the shoe sole is easily eroded by oxygen in air, and the mechanical property is reduced can be solved, and the aging resistance ofthe shoe sole is improved.

The invention discloses a preparation method of isobutyl cage polysilsesquioxane modified polyurethane. First, the isobutyl cage polysilsesquioxane is pretreated in a vacuum oven, and then mixed with xylene Diisocyanate is reacted to prepare prepolymer, and then polyether polyol VORANOL 3010 is added for chain extension reaction, and modified by chemical bonding to prepare nano-organic-inorganic hybrid modified polyurethane. When the content of isobutyl cage polysilsesquioxane increased from 0% to 22%, the glass transition temperature of the modified polyurethane increased from ‑44.3 to ‑13.9°C, an increase of 30.4°C. The mechanical properties have been significantly improved. At the same time, with the increase of isobutyl cage polysilsesquioxane content, some sharp diffraction peaks appeared in the X-ray diffraction pattern of the modified polyurethane. Compared with the X-ray diffraction patterns of pure polyurethane, it can be concluded that the increase of the content of isobutyl cage polysilsesquioxane promotes the formation of crystal clusters and the obvious hard segment-soft segment microphase separation in the modified polyurethane structure Phenomenon, to a certain extent, improve the shaping of modified polyurethane.

The invention discloses a sponge capable of changing colors according to ambient temperatures and a production technology of the sponge, which solve the technical problem that the conventional sponge cannot change colors according to the ambient temperatures. According to the technical scheme, homogeneous thermochromic powders are uniformly distributed inside a sponge body and are capable of changing colors under different temperature difference conditions. The production technology comprises the following steps of: in a technology of producing the sponge by a box foaming method, agitating raw materials for producing the sponge at a high speed, adding the thermochromic powders into the raw materials, and then agitating the mixture at a high speed until he thermochromic powders are uniformly distributed in the raw materials of the sponge; putting the raw materials, in which the thermochromic powders are uniformly distributed, of the sponge into a sponge forming box, and performing the procedures of chain propagation, forming, crosslinking and curing on the raw materials to obtain the formed sponge; and slitting the formed sponge according to actual sizes, wherein the thermochromic powders are ensured to be uniformly distributed on each slit surface of the sponge. The sponge has the beneficial effects that the technology is simple, the production cost is low, and the sponge is convenient to produce on the basis of not changing the production devices and the production technology.

The invention relates to a method for preparing aqueous polyurethane. It comprises following steps: employing polyisocyanates bridging agent, proceeding copolymerization with excess aqueous polyether, liquid ploydimethyl oxosilane ternary block and getting ployoxosilane-polyether polymer, introducing polyurethane and organic silicon when generating carbamate with carbamate to main chain, adding chain propagation agent for chain propagation reaction and getting preploymer containing hydrophilic group; adding mixture of polyhydroxy compound and dissolvent into reaction system for second chain propagation reaction; neutralizing by adding neutralization agent, adding water for emulsification, adding polyamine for chain propagation; distilling to remove dissolvent after reaction and getting aqueous polyurethane modified with aqueous polyurethane-polyether polymer. The product possesses characteristics of polyurethane and polysiloxane, the storage stability, mechanics property and comprehensive performance is increased and it mainly is used as pigmentum and aqueous industrial coating material.