CN101362817A

CN101362817A - Method for preparing amino plastic

Info

Publication number: CN101362817A
Application number: CNA2008101575388A
Authority: CN
Inventors: 郭锋; 任志广
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-07
Filing date: 2008-10-07
Publication date: 2009-02-11

Abstract

The invention discloses a method for preparing amino plastics, which includes the following steps: a vacuum granulation reaction kettle (30) and auxiliary facilities thereof are adopted, carbamide (N) and formaldehyde (Q) are taken as basic raw materials, additives and accessories are added, a continuous technological process is carried out and finished products of amino plastics (Z) is obtained. A vacuum granulation technological process (A) comprises: stirring (1), inletting air (2), feeding materials (3), sealing a feed inlet (4), vacuum pumping (5), sending circulating hot water (6), high-speed stirring (7), low-speed stirring (8), sending circulating cold water (9), breaking vacuum and inletting air (10), stopping vacuum pumping (11) and discharging (12). A crushing and screening technological process (B) comprises: crushing materials (13), feeding materials by air pipes (14), crushing materials (16), rough screening of materials (17), close sizing of materials (18) and feeding materials (19). A flaking and granulating technological process (C) comprises: materials go through a granulating hopper (20) and enter a granulating machine for flaking and granulating. The whole technological process is carried out automatically under a closed condition, thereby having good product quality and high production efficiency and causing no environmental pollution.

Description

A kind of preparation method of aminoplastics

Technical field

The present invention relates to plastic production technology, be specifically related to the production technique of aminoplastics.

Background technology

Aminoplastics (claiming urea-formaldehyde moulding powder again) is a kind of widely used thermosetting resin, since have from put out, arc resistance, insulativity be good, product size is stable, and characteristics such as lovely luster are widely used in industries such as electronics, electrical equipment, automobile, machinery, daily utensil.In recent years because the special performance of shortage of resources, energy prices rise and amino film plastics, make it have the vast market space at aspects such as alternative plastic cement, domestic ceramics, timber and metals, market demand is with the speed increment in every year 20%, and development prospect is good.The method of the Soviet Union is learnt in the production technique continuity of present domestic aminoplastics in earlier stage, earlier urea, melamine and formaldehyde are generated resin in reactor, thorough mixing, reaction in the machine of brining together with filler and auxiliary material thereof then, again with the gained material at the moisture eliminator inner drying, then pulverizing, ball milling, sieve, obtain finished product.Discontinuous between each operation of this technology, complicated operation, trouble, energy consumption height, time-consuming many, production process is not sealed, and dust and waste gas pollute environment, and product intensity is not high, and free formaldehyde content is higher in the product.

Summary of the invention

Purpose of the present invention just provides a kind of environmental-protection process, adopts prescription newly, simplifies procedures, and enhances productivity, and reduces and pollutes, and the protection environment improves the finished product quality.

Task of the present invention is finished like this: the preparation method who studies a kind of aminoplastics; be to be basic raw material with urea, formaldehyde; add additive and auxiliary material again; generate through combination reaction; adopt vacuum granulation reactor and affiliated facility, supporting with broken screening system, granulation mechanical connection, under corresponding temperature, time and envrionment conditions; through vacuum granulation technology, broken screening technology, roll the continuous process of sheet granulating process, make the aminoplastics finished product.The vacuum granulation technological process is: open the reactor motor earlier, driving the rotation of stirring main shaft stirs, opening air compressor machine supplies gas to stirring main shaft and bleeder valve cylinder, charging in the vacuum granulation reactor then, add urea, formaldehyde, additive and auxiliary material, opening for feed is sealed, open vacuum pump and carry out vacuum suction, simultaneously in the hydroecium of vacuum granulation reactor, send circulating hot water, be warming up to and vacuumize temperature, carry out high-speed stirring earlier, carry out stirring at low speed again, after treating that temperature of charge rises to temperature of reaction, polycondensation process is carried out in insulation.Reaction finishes, and send circulating water cooling, reduce to vacuumize temperature after, the vacuum breaker air inlet, the stop pumping vacuum, temperature of charge is reduced to discharging behind the drop temperature, opens bleeder valve and emits material, enters broken screening technology process.Broken screening technology process is: material is imported whole crusher, carry out the material fragmentation, carry out the airduct feeding by the broken material carrier pipe again, enter the ultra-fine grain crusher, carry out material and pulverize via hopper, entering the coarse fodder sifting machine then carries out material and roughly selects, coarse fodder is reclaimed, and fines enters the fine powder sifting machine to carry out material and carefully selects, and dust is sieved, the dry material of selecting carries out feeding by defeated material airduct, enters the sheet granulating process process of rolling.Rolling sheet granulating process process is: the material of screening enters granulation machinery and rolls the sheet granulation by the granulation hopper, and machinery pushes dry material by two rollers by granulating; make sheet earlier; again sheet material is interrupted separately,, form the particulate state finished product through whole grain, sieve powder.Additive is: urotropine, trimeric cyanamide, dispersion agent, solidifying agent, lubricant, magnesiumcarbonate, zinc oxide.Auxiliary material is: stopping composition, pigment.Vacuumizing temperature is 48～53 ℃, and temperature of reaction is 78～83 ℃, and drop temperature is＜65 ℃.The time of reaction process is 3 hours.Adopt preparation method of the present invention, the operator only need disposablely add raw material in the vacuum granulation reactor, and whole technological process is carried out under closed state automatically.Novel method combines with support equipment, has formed disposable agglomeration technique and the wet method technology of showing signs of anger.Reinforced according to prescription, the aminoplastics finished particle that the above technical process of process is produced, painted attractive in appearance, smooth finish is good, and color and luster is stable, the hardness height, shock-resistant, non-friable, have good thermotolerance, water tolerance and higher flame retardant resistance, excellent arc resistance, static resistance, anti-electric leakage property, nontoxic, tasteless, anticorrosive.

Test according to the method described above, prove that composition of raw materials of the present invention is reasonable, simple, convenient, realize closed negative pressure production, the level of automation height, the Production Flow Chart science, no dust, environmentally safe, the purity height of product, quality are good, formaldehydeless free, possess the antimycotic antiseptic corrosion resistance, the production efficiency height has reached predetermined purpose preferably.

Description of drawings

Fig. 1 is a process flow diagram of the present invention;

Fig. 2 is a support equipment schematic layout pattern of the present invention.

Among the figure, 1-stir, 2-supply gas 3-charging, 4-opening for feed sealing, 5-vacuum suction, 6-send circulating hot water, 7-high-speed stirring, 8-stirring at low speed, 9-send circulating water, the air inlet of 10-vacuum breaker, 11-stop pumping vacuum, 12-discharging, the fragmentation of 13-material, the feeding of 14-airduct, 15-hopper, 16-material is pulverized, and 17-material is roughly selected, 18-material carefully selects, 19-carry out feeding, 20-granulation hopper, 21-roll sheet to granulate 22-water equipment, 23-return water pipe, 24-water pump, 25-air compressor machine, 26-upper hose, 27-reactor motor, 28-pneumatic tube, 29-transmission rig, 30-vacuum granulation reactor, 31-vacuum exhaust pipe, 32-bleeder valve, 33-vacuum pump, 34-whole crusher, 35-broken material carrier pipe, 36-ultra-fine grain pulverizer, 37-pulverizer motor, 38-screening carrier pipe, 39-coarse fodder sifting machine, 40-fine powder sifting machine, 41-blower fan, 42-defeated material airduct, the 43-machinery of granulating, 44-discharge nozzle; A-vacuum granulation technology, B-broken screening technology, C-roll sheet granulating process, N-urea, Q-formaldehyde, P-urotropine, S-trimeric cyanamide, F-dispersion agent, H-lubricant, G-solidifying agent, M-magnesiumcarbonate, Y-zinc oxide, T-stopping composition, L-pigment, W-material, Z-finished product.

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the invention is described further.

Consult Fig. 1,, carry out vacuum granulation technology A earlier: drive reactor motor 27 and stir 1, open air compressor machine 25 and supply gas 2, then to the throat-fed 3 of vacuum granulation reactor 30 according to technical process.The basic raw material of charging 3 comprises: urea N, formaldehyde P; Additive comprises: urotropine P, trimeric cyanamide S, dispersion agent F, lubricant H, solidifying agent G, magnesiumcarbonate M, zinc oxide Y; Auxiliary material comprises: stopping composition T (fibrous paper that employing cuts), pigment L (apolegamy as required).Charging while stirring, all raw material has advanced, and with the opening for feed sealing 4 of vacuum granulation reactor 30, opens vacuum pump 33 then and carries out vacuum suction 5, send circulating hot water 6 to carry out heating, temperature keeping simultaneously.Temperature is remained between 48～53 ℃, be evacuated to material and be obvious sinking state, continue then to heat up.Improve motor speed simultaneously, carry out high-speed stirring 7; When reaching 78～83 ℃, reduce motor speed, carry out stirring at low speed 8, the beginning polycondensation.After 3 hours, send circulating water 9 to be cooled to 70 ℃, in vacuum granulation reactor 30, carry out vacuum breaker air inlet 10, the vacuum of stop pumping simultaneously 11 by inlet pipe.Discharging 12 when temperature drops to below 65 ℃ is opened bleeder valve 32 and is emitted material W, enters whole crusher 34 and carries out material fragmentation 13.Material after the fragmentation is by airduct feeding 14; carry out material by hopper 15 input ultra-fine grain pulverizers 36 and pulverize 16; material after the pulverizing enters coarse fodder sifting machine 39 to carry out material and roughly selects 17; coarse grain is reclaimed pulverizing again; the material of screening enters fine powder sifting machine 40 to carry out material and carefully selects 18, and dust is sifted out, and the qualified material of selecting is carried out feeding 19 through airduct; enter the machinery 43 of granulating by granulation hopper 20 and roll sheet granulation 21, make aminoplastics finished granule Z at last.From discharge nozzle 44 outputs.

Consult Fig. 2, vacuum granulation reactor 30 is connected transmission with reactor motor 27 by transmission rig 29; Provide recirculated water by water equipment 22, be communicated with the hydroecium of vacuum granulation reactors 30, carry out water cycle by water pump 24 and upper hose 26, return water pipe 23; Supplied gas to the cylinder that stirs main shaft and bleeder valve 32 by pneumatic tube 28 by air compressor machine 25, vacuum pump 33 is communicated with vacuum granulation reactor 30 by vacuum exhaust pipe 31 and outwards bleeds.The material that makes is sent into whole crusher 34 by bleeder valve 32 dischargings via carrier pipe, and the material after the fragmentation is sent into hopper, enters ultra-fine grain pulverizer 36 by broken material transfer lime 35; Pulverize the back and enter coarse fodder sifting machine 39, carry out material and roughly select by screening carrier pipe 38; Material after roughly selecting enters fine powder sifting machine 40 by screening carrier pipe 38 again, carries out material and carefully selects; Send into defeated material airduct 42 by blower fan 41 blowings then, enter the machinery 43 of granulating, roll sheet and granulate through granulation hopper 20.The finished product of making is tested at last by discharge nozzle 44 dischargings, the packing warehouse-in.

Whole technical process of the present invention is continuous all the time, is in sealed state fully and moves automatically.The efficiency ratio traditional technology of vacuum granulation technology A improves 4-5 doubly; The comminution ratio of broken screening technology B is big, and the material size maximum can reach 30mm; Roll the particle diameter of the finished product Z that sheet granulating process C makes and in the 5-150 mu m range, can regulate, but the equal direct production of the product of each particle size fraction.The present invention adopts negative pressure production, no dust from flying, and noise is low, and production environment is pollution-free, compliance with environmental protection requirements.Technological process is not destroyed the chemical property of material, does not reduce the effective content of product, and inclusion-free flows into, the product purity height.Whole process realizes closed automatic production, is suitable for large-scale mass production.

Claims

1, a kind of preparation method of aminoplastics; be to be basic raw material with urea (N), formaldehyde (Q); add additive and auxiliary material again; generate through combination reaction; it is characterized in that adopting vacuum granulation reactor (30) and affiliated facility; be connected supporting with broken screening system, the machinery (43) of granulating; under corresponding temperature, time and envrionment conditions; through vacuum granulation technology (A), broken screening technology (B), roll the continuous process of sheet granulating process (C), make aminoplastics finished product (Z).

2, preparation method according to the described aminoplastics of claim 1, it is characterized in that said vacuum granulation technology (A) process is: open reactor motor (27) earlier, drive the rotation of stirring main shaft and stir (1), open air compressor machine (25) to stirring main shaft and bleeder valve (32) cylinder supply gas (2), charging (3) in vacuum granulation reactor (30) then, add urea (N), formaldehyde (Q), additive and auxiliary material, with opening for feed sealing (4), open vacuum pump (33) and carry out vacuum suction (5), in the hydroecium of vacuum granulation reactor (30), send simultaneously circulating hot water (6), be warming up to and vacuumize temperature, carry out high-speed stirring (7) earlier, carry out stirring at low speed (8) again, treat that temperature of charge rises to temperature of reaction after, polycondensation process is carried out in insulation.Reaction finishes, and send circulating water (9) cooling, reduce to vacuumize temperature after, vacuum breaker air inlet (10), stop pumping vacuum (11), temperature of charge is reduced to discharging (12) behind the drop temperature, open bleeder valve (32) and emit material (W), enter broken screening technology (B) process.

3, preparation method according to the described aminoplastics of claim 1, it is characterized in that said broken screening technology (B) process is: material (W) is imported whole crusher (34), carry out material fragmentation (13), carry out airduct feeding (14) by broken material carrier pipe (35) again, via hopper (15), enter ultra-fine grain crusher (36), carry out material and pulverize (16), entering coarse fodder sifting machine (39) then carries out material and roughly selects (17), coarse fodder is reclaimed, and fines enters fine powder sifting machine (37) to carry out material and carefully selects (18), and dust is sieved, the dry material of selecting carries out feeding (19) by defeated material airduct (42), enters sheet granulating process (C) process of rolling.

4, according to the preparation method of the described aminoplastics of claim 1; it is characterized in that said sheet granulating process (C) process of rolling is: the material of screening is by granulation hopper (20); enter the machinery (43) of granulating and roll sheet granulation (21); machinery (43) pushes dry material by two rollers by granulating; make sheet earlier; again sheet material is interrupted separately,, form particulate state finished product (Z) through whole grain, sieve powder.

5, according to the preparation method of the described aminoplastics of claim 1, it is characterized in that said additive is: urotropine (P), trimeric cyanamide (S), dispersion agent (F), solidifying agent (G), lubricant (H), magnesiumcarbonate (M), zinc oxide (Y).

6, according to the preparation method of the described aminoplastics of claim 1, it is characterized in that said auxiliary material is: stopping composition (T), pigment (L).

7, according to the preparation method of the described aminoplastics of claim 2, it is characterized in that the said temperature that vacuumizes is 48～53 ℃, temperature of reaction is 78～83 ℃, drop temperature is＜65 ℃.

8, according to the preparation method of the described aminoplastics of claim 2, the time that it is characterized in that said reaction process is 3 hours.