54results about How to "Hot pressing temperature is low" patented technology

The invention relates to a aldehyde-free liquid adhesive and a wood-based panel processing method. The liquid adhesive is prepared by mixing magnesium chloride aqueous solution and magnesium oxide powder of inorganic materials in a ratio of 1:1; the magnesium chloride aqueous solution is made of magnesium chloride powder or halogenated Tablets and water are prepared according to the ratio of 1:1 to 1:3, and the purity of magnesium chloride powder or halogen flakes is 45% to 99%. In this way, the liquid adhesive does not contain formaldehyde, but also has good bonding strength, and the price is extremely low. It can also be directly applied to existing mechanical equipment to process wood-based panels, without adding or modifying old mechanical equipment, and without changing long-term habitual operations. The model is easy to be accepted by wood-based panel manufacturers, has strong market competitiveness, and is easy to promote and sell; and when used in the manufacture of wood-based panels, it can be directly hot-pressed after coating the formaldehyde-free liquid adhesive, without cold pressing, and the processing process is simplified. , higher production efficiency, lower hot pressing temperature, less energy consumption and lower production cost.

The invention provides an aldehyde-free veneer which comprises a plurality of combined single plates, the contiguous layers of the single plates are in a crossed structure or a parallel structure, a glue layer is arranged between contiguous single plates, and the adhesive of the glue layer is isocyanate. The invention also includes the producing method of the aldehyde-free veneer. In the normal producing method of veneer, isocyanate adhesive is used, the hot pressing time in the work procedures is shortened, the hot pressing temperature is lowered, and the requirement of the water content of the single plate is lowered. Spraying glue application method is used in the work procedure of applying glue to the veneer to greatly reduce the applied glue amount of the veneer, thus besides the formol release amount is greatly lower than that of the relevant standard, and the aldehyde-free veneer also has more reasonable technology.

A method for preparing alkali lignin modified phenol-formaldehyde resin comprises the following steps: phenol, a first batch of formaldehyde solution, alkali lignin, metal oxide and dilution water are added into a reactor; a second batch of formaldehyde solution is added into the reactor; and a third batch of formaldehyde solution and a first batch of alkaline solution are added, formaldehyde trapping agent and a second batch of alkaline solution are added, and then material is discharged after cooling. The invention adopts the copolymerization technique to prepare an alkali lignin phenol formaldehyde adhesive, lignin and the phenol are added simultaneously, obtained hydroxymethylated lignin is reacted with hydroxymethyl phenol, a small part of the obtained hydroxymethylated lignin participates in the polycondensation of the hydroxymethyl phenol to form a main chain, and a large part of the obtained hydroxymethylated lignin forms branch chains through graft copolymerization, therefore, the lignin is introduced into a molecular chain and the aim of modifying phenol-formaldehyde resin is achieved. The invention can replace the use of 30-50 percent of the phenol, realizes stable and easy reaction control and easy industrial production; the bonding strength satisfies the requirements of national I-level plates; formaldehyde release reaches E0 level; therefore, the invention provides a new approach to the development of environment-friendly biomass-based wood adhesive and resource utilization of waste materials.

The invention belongs to the technical field of iron-making and specifically relates to hot briquetted iron coke for iron-making and a preparation method thereof. The hot briquetted iron coke is composed of the following raw materials in percentage by mass: 10%-30% of iron ore powder, 60%-80% of pulverized soft coal and 10%-20% of pulverized blind coal. The preparation method comprises the following steps: thoroughly and evenly mixing the raw materials to obtain a mixture, heating the mixture in a heating furnace to 200-350 DEG C, performing instant hot briquetting on the mixture to obtain a hot briquetted iron coke green ball, putting the hot briquetted iron coke green ball in a tunnel kiln and performing high-temperature destructive distillation and carbonization at a certain temperature increased previously at a certain rate, and then taking out the braised material for cooling, thereby obtaining the hot briquetted iron coke. The prepared hot briquetted iron coke has excellent compressive strength, abrasive resistance, reactivity and post-reaction strength; the hot briquetted iron coke is used for blast furnace iron-making instead of partial coke, and therefore, the adaptability of blast furnace iron-making to fuels is improved. The preparation method of the hot briquetted iron coke is wide in raw material source, low in production cost, simple in process flow and free from the use of a binder, and has wide industrial application prospect.

The invention discloses an electronic product provided with a metal connecting structure. The electronic product comprises a metal shell and at least one metal part which is fixed at the inner side of the metal shell by hot melt adhesive layer. In addition, the invention also discloses a method for preparing the electronic product provided with the metal connecting structure. The electronic product has the advantages of simple preparation and elegant appearance.

The invention relates to a formaldehyde-free bamboo glulam. The bamboo glulam is formed by splicing bamboo splints through radial surfaces and gluing the bamboo splints through tangential surfaces, wherein an adhesive of an adhesive layer arranged for splicing the radial surfaces is a polyvinyl acetate emulsion adhesive (white latex) or aqueous high-molecular isocyanate adhesive (API); and the adhesive of the adhesive layer arranged for gluing the tangential surfaces is the isocyanate adhesive. The invention also provides a method for preparing the bamboo glulam; and the method comprises the following steps of: preparing materials; applying the adhesive to the radial surfaces of the bamboo splints; splicing the tangential surfaces; applying the adhesive to the tangential surfaces of a single-layer bamboo laminated sheet; assembling the tangential surfaces; gluing the tangential surfaces; and performing post-processing and the like, wherein the adhesive used in the step of applying theadhesive to the radial surfaces is the white latex or API; and the adhesive used in the step of applying the adhesive to the tangential surfaces of the single-layer bamboo laminated sheet is the isocyanate adhesive. Due to the adoption of an aldehyde-free adhesive, the amount of the released formaldehyde of the bamboo glulam is below 0.1mg / L, and the gluing performance of the sheet is improved and the machining energy loss is reduced by applying the white latex or the API used in the splicing of the radial surfaces.

The invention relates to a standard wearing part suitable for determining the abrasiveness of oil drilling formation rocks. The technical solution is: the standard wear part is designed as a miniature core drill structure, which is composed of grinding parts and steel body connecting parts. Among them, the grinding parts are composed of phenolic resin matrix material and artificial polycrystalline diamond grinding material. The pressure process is integrated and sintered, and after processing and trimming, it is connected to the main shaft of the test device through the steel body connecting parts. Its beneficial effect is: it has reasonable wear resistance and good self-sharpening performance, and can effectively drill into rocks, and at the same time, it produces wear amount, which reflects the essence of diamond drill bit wear in the actual drilling process; The device is simple, the operation is convenient, and the technical conditions are stable. Under the conditions of simulating the dynamic grinding and rock breaking process of the diamond drill bit, the consumption of test rock samples or field cores is greatly reduced, and the test cost is saved.