47results about How to "Shorten gel time" patented technology

A fast curable non-isocyanate-based polyurethane- and polyurethane-epoxy network nanocomposite polymeric compositions are derived upon crosslinking a mixture comprising of natural or modified nano-clay [ionic phyllosilicate] with platelet thickness in the scale of A (˜1 nm) and aspect ratio (length/thickness) higher than 10 (nm)] preferably natural or modified montmorillonite with either a monomer(s) or oligomer(s) bearing at least one cyclocarbonate group or a mixture of the latter with an epoxy resin, with a hardener, which is a monomer or oligomer or mixtures therefrom, bearing primary and/or secondary amino groups. The use of the nanoclays reduces the gel time and increases the adhesion of the cured polyurethane and polyurethane/epoxy hybrid and also reduces its water absorption.

A prepolymer blend for a thermosetting polyurethane material that allows for control of the reaction time is disclosed herein. The prepolymer blend is preferably composed of a polyurethane prepolymer and dimethyl methylphosphonate. The thermosetting polyurethane is preferably utilized as a cover for a golf ball. The cover is preferably formed over a core and boundary layer.

A preparation method of a phenolic resin base carbon aerogel comprises steps of: (1) preparing a phenolic resin solution with a content of 10-50wt%; (2) gelling and ageing under high temperature and high pressure; (3) carrying out supercritical drying and discharging to obtain an organic aerogel; (4) cracking, carbonizing and discharging to obtain the aerogel. The preparation method of the carbon aerogel of the invention has the following three advantages: 1) a sodium carbonate catalyst does not need to be added in the first step, and the carbon aerogel has high purity and does not contain metal ion impurity; 2) the raw material phenolic resin is cheap; 3) a total process time is shortened that the organic aerogel can be obtained in one day and that the carbon aerogel can be obtained in two days.

Aqueous solutions of inorganic nitrate salts are used to accelerate the gelling of epoxy gelcoat resins without adversely affecting the glass transition temperature of the finally cured gelcoat. The aqueous accelerants may be used to accelerate gelling of gelcoats that are formed during initial fabrication of composite parts. The aqueous acclerants are also useful for shortening the gel time of gelcoats that are intended for use in repairing damaged structures.

Disclosed in this specification is a method for forming a silicone hydrogel material that is useful for forming contact lens materials. The method includes using an effective amount of a borate additive to reduce the gel time of the silicone hydrogel reactive mixture and/or enhance the optical properties of the resulting cured material.

The invention discloses a cyanate/microcapsule resin system and a preparation method thereof. The preparation method is as follows: calculated by weight, 100 parts of cyanate (CE) is heated at 80-100 DEG C to melt, organotin microcapsule coated with 0.125-5 parts of polyurea formaldehyde is filled in CE resin; and by utilizing the controlled-release function of the polyurea formaldehyde used as the microcapsule wall material to the organotin compound used as the microcapsule core catalyst, the CE curing reaction temperature and reaction rate can be adjusted. After being cured, the obtained CE/microcapsule resin system has good mechanical properties; and the resin system can be used to prepare high-performance composites used in aviation and aerospace, electronic elements and the like.

The invention discloses a modified phenol formaldehyde resin, a backing plate and a preparation method thereof. The backing plate is prepared by hot compression of paper in the modified phenol formaldehyde resin through a gum dipping process, wherein toluenesulfonic acid is added in the modified phenol formaldehyde resin, so that the colloidizing time is effectively shortened, thus increasing the production efficiency; calcium lignosulfonate added in the resin is beneficial to reducing warpage of the backing plate, and effectively improves the hardness, density, smoothness and drilling precision of the backing plate; and meanwhile, the backing plate provided by the invention can also effectively solve the problem of high needle breakage rate in IC (integrated circuit) packaging substrate drilling.

The invention belongs to the technical field of pharmaceutical preparations for animals, and discloses a novel diclofenac injection and a preparation method thereof. The diclofenac injection comprisesdiclofenac existing in a dispersed form, diclofenac sodium dissolved in a system, a temperature-sensitive in-situ gel matrix, polyethylene glycol, sodium alginate, a polymer retardant and water for injection, wherein the temperature-sensitive in-situ gel matrix consists of poloxamer 407 and poloxamer 188. The diclofenac injection specifically comprises the following components in percentage by mass of 2-18 percent of the diclofenac, 0-8 percent of the diclofenac sodium, 10-25 percent of the poloxamer 407, 0.1-16 percent of the poloxamer 188, 0.1-7 percent of polyethylene glycol, 0.02-5 percent of sodium alginate, 0.01-5 percent of the polymer retardant, 0.001-2 percent of a bacteriostatic agent and the balance of the water for injection. According to the diclofenac injection disclosed bythe invention, the gelling temperature is 31-35 DEG C, the gelling time is within 15 seconds, the diclofenac injection exists in a liquid state at room temperature, and a gel storage can be quickly formed at an injection part during intramuscular injection or subcutaneous injection administration.

The invention aims to provide a nanometer modified rapid prototyping polymer insulating material. The nanometer modified rapid prototyping polymer insulating material specifically comprises the following components in percentage by mass: silicone rubber, nano-zinc oxide and nano-silicon dioxide. According to the invention, 2.4%-7% by mass of the nano-zinc oxide and 1.2%-7.2% by mass of the nano-silicon dioxide are added into the silicone rubber, so while the insulating property of a silicone rubber material is maintained, the gelation and curing temperature conditions of the silicone rubber material are improved, the gelation and curing time of the silicone rubber material is shortened, and the heat-conducting property and the aging resistance of the insulating material are enhanced. The invention also provides a preparation method of the nanometer modified rapid prototyping polymer insulating material.

An epoxy resin composition comprising an epoxy resin component combined with a sufficient amount of an imidazole curative to provide curing of the epoxy resin composition. The epoxy resin composition further includes a non-hydroxyl containing cure accelerator for the imidazole curative.

The invention discloses a production process capable of improving the powder coating production yield. The process comprises the following steps: 1, preparing and mixing materials to obtain a coatingmixture which is prepared from the following components in parts by weight: 25-35 parts of high-viscosity polyester resin, 25-35 parts of low-viscosity polyester resin, 3-3.5 parts of a curing agent T105, 12-14 parts of titanium dioxide, 0.4-0.6 part of carbon black, 0.08-0.1 part of pigment green, 0.1-0.3 part of ferrite yellow, 0.8-1 part of a flatting agent, 0.2-0.4 part of a defoaming agent, 0.04-0.06 part of a catalyst, 0.5-0.6 part of nano-metal oxide particles and 20-23 parts of filler; 2, extruding to obtain an extruded material; 3, cooling and pressing the extruded material to obtaina coating sheet, and cooling by adopting a water-cooling mode; and 4, grinding the coating sheet, and controlling the grinding particle size to be 37-41mu m. The production process has the characteristics of improving the powder coating yield, improving the product production efficiency and reducing the production cost.

The invention belongs to the technical field of accelerators, and particularly relates to an unsaturated polyester resin accelerator as well as a preparation method and application thereof. The unsaturated polyester resin accelerant is prepared from the following raw materials in percentage by mass: 69 to 89.5 percent of methanol, 0.5 to 1 percent of copper acetate, 5 to 10 percent of cobalt iso-octoate and 5 to 20 percent of water. The invention also provides a preparation method of the unsaturated polyester resin accelerator, which comprises the following steps: mixing methanol, copper acetate, cobalt iso-octoate and water, and stirring for 30-60 minutes to obtain the unsaturated polyester resin accelerator. The accelerator product system is stable, the layering phenomenon cannot occur after long-time standing, and the problem of layering of an existing accelerator system is solved. A resin product prepared from the accelerator is good in curing effect and high in hardness, and the phenomenon that the resin is sticky to hands and becomes soft is avoided. The unsaturated polyester resin accelerator can shorten the gelling time and improve the production efficiency, the highest exothermic peak temperature in the resin curing process is similar to that of commercially available products, the curing effect is ideal, and the unsaturated polyester resin accelerator can replace existing products.