CN102031069A - Method for pelleting accelerating agent DM and binding agent adopted therein - Google Patents

Abstract

The invention discloses a method for pelleting an accelerating agent DM and a binding agent adopted therein. The method comprises the following steps: preparing the binding agent by utilizing povidone, vinylacetate, atoleine, emulsifying agent, polyving akohol, dispersing agent, sodium bicarbonate and water; adding the prepared binding agent and a DM wet material into an agitated kettle; abundantly and evenly stirring; adding the mixture into a pelletizer to extrude a plurality of cylindrical grains; separating the grains from the powder by a vibrating screen after the cylindrical grains are dried by a belt dryer; directly finishing and packing the grains-shaped products on the screen; and returning the power under the screen to the agitated kettle to be stirred and pelleted again. The binding agent is reasonable in prescription, is strong in compatibility with various rubbers, is high in one-step pelleting ratio of the product, has no bad influence on the product, and is better in the application performance. The one-step pelleting ratio of the product obtained by the pelleting method is more than 80%, the average rigidity is about 2N, the grains can not be broken during practically packing and moving processes, and the quality index is accordant with the first grade of the national standard.

Description

A kind of altax prilling process and the binding agent that wherein adopts

Technical field

The present invention relates to the prilling process of a kind of rubber vulcanization accelerator DM (chemical name is curing and thiazole), specifically, relate to utilize binding agent in a kind of preparation, with the production method of the direct granulation of wet feed DM.

Background technology

Vulcanization accelerator plays important effect in vulcanization of rubber process, it can accelerate the reaction of rubber and vulcanizing agent greatly, enhance productivity, also can improve the physical and mechanical properties of vulcanized rubber simultaneously, DM is the requisite a kind of primary accelerator of present rubber industry.Because the DM material is thin partially, static and dust phenomenon are particularly serious, so along with the increasingly stringent that requires of environmental protection management and industrial use, its powder-like product is more and more substituted by granulated product in industry.DM granulated product and powder-like product relatively have following advantage: not having dust from flying in the use, is user friendly product; Granulated product does not have surface attachment, disperses easily, easier metering in the auxiliary agent product uses.

The rubber ingredients granulation all has crucial meaning to auxiliary agent factory and rubber mill, can reduce the pollution of dust, increases the accuracy of source mill's batching, ensures that to improving the sizing material physicals quality product plays promoter action.The rubber ingredients granulation is the technological process of the finished product in the auxiliary agent production process, and the whole agglomeration technique level of China's rubber ingredients is not high at present, and development is also uneven, and the granulation product ratio is on the low side.

That the auxiliary agent agglomeration technique comprises is oil-filled, non-slurry pelletizing, wet granulation, melt pelletization and the pre-dispersed granulation of carrier.Two kinds of non-slurry pelletizing, wet granulations are generally adopted in present stage China's rubber vulcanization accelerator DM granulation.Non-slurry pelletizing is after DM siccative and binding agent, water etc. are mixed in proportion, and through use the belt dryer drying after extruding or the spray method granulation, dry back product gets finished product after vibratory screening apparatus is handled.And wet granulation is after DM wet feed and binding agent, water etc. are mixed in proportion, after granulation, drying finished product.Excessive or select improperly if add binding agent in granulation process, can cause particle really up to the mark, difficulty etc. during dispersion, but if do not add or add very little, then cause cohesive force not enough, granulating rate is too low, and particle scatters again in the transportation handling process, does not reach the granulation purpose.Therefore, in the granulation of rubber vulcanization accelerator DM was produced, selecting for use of binding agent was very important, and its content can not be too much or very few.

The DM grain often owing to excessive difficulties in dispersion, the inequality of causing of hardness of grain, causes problems such as mixing time length in application process, if efflorescence does not reach the granulation purpose but the hardness of reduction grain then can make its hardness deficiency.Therefore, selection of binder is extremely important, should make institute's granulation that certain rigidity is arranged, and makes in its use unaffected again.

Summary of the invention

First technical problem that the present invention will solve provides a kind of binding agent that the altax granulation is produced that is used for, make granulating rate height of material, DM granulated product intensity is big, and Pulverization ratio is low, and to the physicochemical property of DM grain and vulcanization reaction character without any influence.

In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:

A kind of binding agent that is used for the altax granulation, this binding agent is composed of the following components according to weight part:

Polyvidone: 80-100

Vinyl acetate: 50-65

Whiteruss: 40-50

Emulsifying agent: 1-5

Polyvinyl alcohol: 0.5-1

Dispersion agent: 0.5-1

Sodium bicarbonate: 0.1-0.5

Glycerol: 0.01-0.1

Water: 150-180

Wherein emulsifying agent is selected from wherein a kind of of polyoxyethylene nonylphenol ether, polyoxyethylene octylphenol ether, octadecane alcohol radical Soxylat A 25-7.

Wherein dispersion agent is selected from wherein a kind of of sodium laurylsulfonate, tripoly phosphate sodium STPP, fatty acid polyglycol ester.

Second technical problem that the present invention will solve provides a kind of altax prilling process, and this procedure is simple, is easy to industrialization, directly carries out granulation by the DM wet feed, avoids drying twice, has saved manpower and materials, has reduced energy consumption.

In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:

A kind of altax prilling process, this method may further comprise the steps:

(1) weight percent 1 ‰～2% of the binding agent in the claim 1 by DM material dry product taken by weighing;

(2) binding agent that takes by weighing is added in the DM wet feed of moisture content≤25%, stir;

(3) mixture that stirs is added in the tablets press, extrude the cylinder shape particle;

(4) belt dryer is dry under 90 ℃～110 ℃ temperature;

(5) vibration screen separating particles and powder, the direct finished product packing of granular product on the screen cloth, powder returns in the step (2) stirring-granulating again under the screen cloth.

The invention has the beneficial effects as follows:

Prilling process process provided by the invention is simple, be easy to industrialization, use granulating rate of this method granulation DM product up to more than 80%, average hardness is about 2N, can reach customer requirements fully, also do not occur the grain breakage phenomenon in the actual packaging moving process, after chemical examination was measured, its quality index met country-level product standard.

The DM granulated product is not observed serious dust from flying phenomenon in mixing process, do not find to mix uneven phenomenon, compares with powder-like product, and DM grain mixing time, vulcanization rate, time of scorch, tensile yield etc. all do not have significant difference.

Binder formula provided by the invention is reasonable, contains dispersion agent, swelling agent etc., and all very strong with the consistency of multiple rubber, consumption is few, and is effective, granulating rate height of product, and to the physicochemical property of product and vulcanization reaction character without any detrimentally affect.Owing in binding agent, also added a spot of dispersion agent, to compare with other DM granulated products, its application performance has certain advantage as mixing time, vulcanization rate, time of scorch, tensile yield etc.

Embodiment

The present invention is described in further detail below by specific embodiment:

Following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.

Embodiment 1

According to subordinate list 1 preparation binding agent; the binding agent that the prepares ratio with the weight 1 ‰ of DM dry product is joined in the agitator kettle with DM wet feed (moisture content≤25%); behind abundant stirring and evenly mixing; add in the tablets press; make wet product material from the head die plate hole, extrude the cylindrical particle that uniform diameter is 2 ± 0.2mm by screw rod transmission; after through 90 ℃ of dryings of belt dryer; separate grain and powder with vibration screen; the direct finished product packing of granular product on the screen cloth, powder returns in the agitator kettle stirring-granulating again under the screen cloth.Use granulating rate of this method granulation product up to more than 80%, average hardness can reach customer requirements fully about 2.00N, and product performance are compared indifference with the DM powder.

Subordinate list 1: binding agent becomes to be grouped into

Composition	Parts by weight
		Polyvidone	80
Vinyl acetate	50
		Whiteruss	40
Polyoxyethylene nonylphenol ether	1
		Polyvinyl alcohol	0.5
Sodium laurylsulfonate	0.5
		Sodium bicarbonate	0.1
Glycerol	0.01
		Water	150

Embodiment 2

According to subordinate list 2 preparation binding agents; the binding agent that the prepares ratio with the weight 1% of DM dry product is joined in the agitator kettle with DM wet feed (moisture content≤25%); behind abundant stirring and evenly mixing; add in the tablets press; make wet product material from the head die plate hole, extrude the cylindrical particle that uniform diameter is 2 ± 0.2mm by screw rod transmission; after through 100 ℃ of dryings of belt dryer; separate grain and powder with vibration screen; the direct finished product packing of granular product on the screen cloth, powder returns in the agitator kettle stirring-granulating again under the screen cloth.Use granulating rate of this method granulation product up to more than 82.3%, average hardness can reach customer requirements fully about 2.00N, and product performance are compared indifference with the DM powder.

Subordinate list 2: binding agent becomes to be grouped into

Composition	Parts by weight
		Polyvidone	90
Vinyl acetate	55

Whiteruss	45
		Polyoxyethylene octylphenol ether	2
Polyvinyl alcohol	0.25
		Tripoly phosphate sodium STPP	0.3
Sodium bicarbonate	0.2
		Glycerol	0.05
Water	165

Embodiment 3

According to subordinate list 3 preparation binding agents; the binding agent that the prepares ratio with the weight 2% of DM dry product is joined in the agitator kettle with DM wet feed (moisture content≤25%); behind abundant stirring and evenly mixing; add in the tablets press; make wet product material from the head die plate hole, extrude the cylindrical particle that uniform diameter is 2 ± 0.2mm by screw rod transmission; after through 110 ℃ of dryings of belt dryer; separate grain and powder with vibration screen; the direct finished product packing of granular product on the screen cloth, powder returns in the agitator kettle stirring-granulating again under the screen cloth.Use granulating rate of this method granulation product up to more than 83.5%, average hardness can reach customer requirements fully about 2.01N, and product performance are compared indifference with the DM powder.

Subordinate list 3: binding agent becomes to be grouped into

6

Composition	Parts by weight
		Polyvidone	100
Vinyl acetate	65
		Whiteruss	50
Octadecane alcohol radical Soxylat A 25-7	5
		Polyvinyl alcohol	1
Fatty acid polyglycol ester	1
		Sodium bicarbonate	0.5
Glycerol	0.1

Water

180

Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, these all belong within protection scope of the present invention.

Claims (4)

1. a binding agent that is used for the altax granulation is characterized in that, this binding agent is composed of the following components according to weight part:

Polyvidone: 80-100

Vinyl acetate: 50-65

Whiteruss: 40-50

Emulsifying agent: 1-5

Polyvinyl alcohol: 0.5-1

Dispersion agent: 0.5-1

Sodium bicarbonate: 0.1-0.5

Glycerol: 0.01-0.1

Water: 150-180

2. a kind of binding agent that is used for the altax granulation according to claim 1 is characterized in that, wherein emulsifying agent is selected from wherein a kind of of polyoxyethylene nonylphenol ether, polyoxyethylene octylphenol ether, octadecane alcohol radical Soxylat A 25-7.

3. a kind of binding agent that is used for the altax granulation according to claim 1 is characterized in that, wherein dispersion agent is selected from wherein a kind of of sodium laurylsulfonate, tripoly phosphate sodium STPP, fatty acid polyglycol ester.

4. an altax prilling process is characterized in that, this method may further comprise the steps:

(1) weight percent 1 ‰～2% of the binding agent in the claim 1 by DM material dry product taken by weighing;

(2) binding agent that takes by weighing is added in the DM wet feed of moisture content≤25%, stir;

(3) mixture that stirs is added in the tablets press, extrude the cylinder shape particle;

(4) belt dryer is dry under 90 ℃～110 ℃ temperature;

(5) vibration screen separating particles and powder, the direct finished product packing of granular product on the screen cloth, powder returns in the step (2) stirring-granulating again under the screen cloth.