JPS60262849A - Production of amino resin molding material - Google Patents

Abstract

PURPOSE:To obtain the titled molding material which can dispense with drying and kneading stages and save the cost of equipment, space and energy, by mixing a liquid amino resin having a low water content with pulp powder, crushing the mixture, coloring it and tableting it. CONSTITUTION:Urea or melamine (A) from a feed tank 1, 1.2-3mol (per mol of component A) of paraformaldehyde (B) from a feed tank 2 and a catalyst (C) such as NaOH from a catalyst tank 3 are fed through constant feeders 4, 5, 6 to a closed, complete discharge type reactor 7 where a continuous condensation reaction is carried out in a liquid state (at 65 deg.C) to obtain a liquid amino resin having a low water content (e.g. 3wt%). The resin is fed through a cooler 18 to a crusher 19, where the resin is mixed with pulp powder fed through a constant feeder 10 from a pulp tank 9 and the mixture is crushed into a powder having a particle size of 60 mesh or below. The powder is fed through a collector 20 and a constant feeder 21 to a coloring and mixing machine 22, where the powder is colored with a pigment fed through a constant feeder 14. The colored powder is tableted in a tableting machine 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a method for producing an Ami7-based resin molding material that does not require a drying step or a crosstalk step.

[Background technology 1] In general, the manufacturing method for 7/7 resin molding materials consists of a synthesis process, a kneading process, a drying process, a pulverization coloring process, and a granulation process. Conventionally, the condensation process reduces the water content to approximately A 30% by weight liquid amyl/based resin is obtained, mixed and impregnated into a sheet-like bulb, dried, and then mixed and dispersed with additives such as pigments, plasticizers, curing agents, and mold release agents, and pulverized. This was then granulated to produce an amino-based resin molding material, but since the liquid amino-based resin has a high moisture content, it requires a lot of energy to dry after mixing and impregnating the valve, and the equipment is large. This increases costs, and since drying is required, the manufacturing process must be temporarily interrupted at this stage, making it difficult to automate and save labor as a continuous process cannot be adopted. In addition, the sheet-like pulp must be kneaded and pulverized, which increases the number of man-hours and reduces productivity.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned circumstances, and its purpose is to eliminate the need for a drying step and a pulp kneading step in a method for producing an amide/based resin molding material, and to reduce the process time. Through simplification and rationalization, it is possible to reduce equipment costs, save space, and save energy.Moreover, since a drying process is not required, a continuous process can be adopted, allowing automation and labor savings. The aim is to increase productivity.

[Disclosure of the Invention] The method for producing a 7-7 type resin molding material of the present invention involves mixing powdered pulp with a liquid amino resin with a low water content obtained by a condensation reaction, pulverizing and coloring the mixture, and then granulating it. With this configuration, the above object can be achieved. In other words, by using a liquid amino-based resin with a low moisture content, a drying process is not required, and since powdered pulp is mixed with this liquid amino-7 resin, there is no need for a pulp mixing process, and the process can be simplified. It can be simplified and streamlined.

Hereinafter, the manufacturing method of the present invention will be explained based on one-step diagrams shown in the accompanying drawings. The liquid amino-based resin with a low moisture content, for example, about 3% by weight, used in the present invention is prepared by using urea or melamine from the raw material tank 1, paraformaldehyde as formaldehyde from the raw material tank 2, and a catalyst such as sodium hydroxide. The alkali is passed from the catalyst tank 3 to the quantitative feeder 4.5.6 for reaction 8!7.
and conduct a condensation reaction. In this condensation reaction, for example, 1 mole of urea is mixed with 1.2 to 2.0 moles of formaldehyde at pH 7 to 8, or 1 mole of melamine is mixed with 2.0 to 3.0 formaldehyde at pH 8,9.
Continuous reaction is carried out at a reaction temperature of ~9.0 and liquid (65°C). For reactions 8 and 7, a closed complete discharge type with stable residence time and no adhesion, such as a twin-screw cell 7 cleaning type, is used. This liquid amino resin with a low moisture content is transferred to a cooling device 18.
and cool it. In this case, a curing agent, a mold release agent, and other additives may be fed into the cooler 18 from the additive tank 12 via the quantitative feeder 8, if necessary. Thereafter, the cooled liquid amino resin is checked for chroma using a color control meter 11 and then sent to a crusher 19. At the same time, the powdered pulp is passed from the pulp tank 9 through the metering feeder 10 and whose color saturation is checked by the color control meter 13, and is crushed 8! 9, the liquid amino resin and the powdered pulp are mixed and crushed into 60 meshes or less by a crusher 19. As for the pulp, white dissolving pulp containing a-cellulose as a main component is generally preferred since amino resins are products with beautiful color saturation. The amount of pulp chips to be added is about 20 to 40% by weight based on the liquid Ami-7 resin. In addition, as shown by the imaginary line in the figure, the powdered pulp is crushed 8
! It is also possible to directly charge the color mixer 22 without charging the color mixer 19. This crushed material is sent to the collection machine 20, and the quantitative feeder 2
1 to the colored mixture t9122. At the same time, a predetermined amount of pigments and other additives are fed into the coloring mixer 8!22 via the quantitative feeder 14 to mix and color.

In this case, the amount of pigment is determined by the amount of the pulverized material collected from the pulverizer 19.
20, it is checked by a color controller 15 and controlled by CCM 25 (Funputer Color Matching). Thereafter, the colored product thus obtained is checked by a color control meter 23, so that the amount of pigment supplied can be fed back. In this case, if the desired result cannot be obtained, correction is performed using CCM. After this, the colored material is put into the kneading rock for commercialization 24, kneaded, and pulverized.
The mixture is granulated using a tablet press 26, and then mixed using a mixing iron to obtain an Ami7-based molding material. The color of this amino-based molding material is checked using a spectrophotometer, and if the color is as desired, it is used as a product. CC if you can't get what you want
Correction is performed using M28.

] Effect of the invention 1 In the present invention, powdered pulp is mixed with a liquid amino resin with a low moisture content obtained by a condensation reaction, pulverized and colored, and then granulated, so there is no drying process and pulp The process can be simplified and rationalized by eliminating the need for cross-wire processes, reducing equipment costs, saving space and energy, and not requiring a drying process, allowing for continuous processes and automation. , it is possible to save labor and increase productivity.

[Brief explanation of drawings]

The attached drawing is an explanatory diagram showing the process of an embodiment of the present invention together with equipment, in which 1.2 is a raw material tank, 3 is a catalyst tank, and 7
8 is a kneading infiltration machine, 9 is a pulp tank, 19 is a crusher, and 22 is a coloring mixer.

Claims (1)

[Claims] (1) A method for producing an amine/based resin molding material, which comprises mixing a powdered bulb into a liquid amine-based resin with a low moisture content obtained by a condensation reaction, pulverizing and coloring it, and then granulating it.