CN102031068A - Binder for granulating accelerator TBBS (N-tert-butylbenzothiazole-2-sulphenamide) and method for granulating accelerator TBBS - Google Patents

Abstract

The invention relates to a binder for granulating an accelerator TBBS (N-tert-butylbenzothiazole-2-sulphenamide) and a method for granulating the accelerator TBBS, wherein the binder comprises the following compositions: povidone, vinylacetate, liquid paraffin, emulsifiers, cross-linking agents, polyoxyethylene, dispersing agents, NaHCO3 and water. The method comprises the following steps: weighting the binder (the weight percentage of the binder to a dry TBBS product is 0.1%-2%); adding the weighted binder into a wet TBBS product the moisture content of which is less than or equal to 18%, and evenly stirring the mixture; adding the evenly stirred mixture into a granulator so as to extrude columned grains with the diameter of 2+/-0.2mm; putting the columned grains into a belt dryer, then drying the columned grains at a temperature of 70 to 80 DEG C; and separating the grains from powder by a vibrating screen, then directly carrying out finished-product packaging on the granular products on the screen. The granulation method provided by the invention is simple in process and easy for industrialization; when the method is used for granulating the TBBS product, the once granulation rate is more than 82%, the average hardness of the granulated TBBS product is about 2N, and the diameter of the TBBS product is 1.8 to 2.2mm, which completely can meet the user requirement; in the actual processes of packaging and moving the granulated TBBS, no grain breakage phenomenon appears; and through chemical examination, the quality index of the granulated TBBS product meets the national standards of first-grade products.

Description

Accelerator TBBS adhesive for granulating and accelerator TBBS prilling process

Technical field

The present invention relates to the graining method for producing of a kind of rubber vulcanization accelerator N-tertiary butyl-2-[4-morpholinodithio sulphenamide (TBBS), specifically, relate to a kind of prilling process for preparing accelerator TBBS adhesive for granulating and TBBS.

Background technology

Rubber vulcanizing accelerator TBBS is a kind of aftereffect type promotor, as safe as a house under service temperature, anti-incipient scorch is good, and the tensile modulus height can improve the synthetical glue usage ratio, increase weighting agent carbon black consumption, active in accelerator CBS, NOBS etc., variable color and pollution are slight, so its excellent property, so become " standard promotor ", be widely used.Along with the increasingly stringent that requires of environmental protection management and industrial use, powder-like product is more and more substituted by granulated product in industry.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 granulation of rubber accelerator is the technological process of the finished product of auxiliary agent production process, and the agglomeration technique level of the integral body of China's rubber accelerator is not high at present, and development is also uneven, and the ratio of granulation product is on the low side.That the promotor agglomeration technique comprises is oil-filled, non-slurry pelletizing, wet granulation, melt pelletization and the pre-dispersed granulation of carrier.The granulation of rubber accelerator all has crucial meaning to promotor factory and rubber mill, has reduced the pollution of dust, has increased the accuracy of source mill's batching, ensures that to improving the sizing material physicals quality product has played promoter action.

Two kinds of non-slurry pelletizing, wet granulations are generally adopted in present stage China TBBS granulation.Non-slurry pelletizing is after TBBS 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 TBBS 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.

The TBBS grain in application process since the grain the hardness problem have difficulties in dispersion, inequality, problems such as mixing time is long, at this problem, my company has carried out improving research to the binding agent that adds in the granulation process, and the compound binding agent after improving has improved the problem that exists in the TBBS application process.

Summary of the invention

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

Second technical problem that the present invention will solve provides a kind of accelerator TBBS prilling process, and this procedure is simple, is easy to industrialization, directly carries out granulation by the TBBS 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 binding agent of accelerator TBBS granulation, this binding agent is composed of the following components according to weight part:

Polyvidone: 100-140 part

Vinyl acetate: 55-75 part

Whiteruss: 50-70 part

Emulsifying agent: 4-7 part

Linking agent: 1-5 part

Polyoxyethylene: 0.5-1 part

Dispersion agent: 0.5-1 part

NaHCO ₃: 0.1-0.5 part

Water: 200-240 part

Wherein:

Emulsifying agent is polyoxyethylene nonylphenol ether, polyoxyethylene octylphenol ether or octadecane alcohol radical Soxylat A 25-7 etc.

Linking agent is silane crosslinkers such as methyltrimethoxy silane, vinyltrimethoxy silane or propyl group triacetoxysilane.

Dispersion agent is sodium laurylsulfonate, tripoly phosphate sodium STPP or fatty acid polyglycol ester etc.

The binding agent of accelerator TBBS granulation is used for the accelerator TBBS prilling process, and step is as follows:

(1) weight percent 1 ‰～2% of binding agent by TBBS material dry product taken by weighing;

(2) binding agent that takes by weighing is added in the TBBS wet feed of mass water content≤18%, stir;

(3) mixture that stirs is added in the tablets press, extrude diameter 2 ± 0.2mm cylinder shape particle;

(4) put into belt dryer drying under 70 ℃～80 ℃;

(5) vibration screen separating particles and powder, 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.

Prilling process process provided by the invention is simple, be easy to industrialization, use granulating rate of this method granulation TBBS product up to more than 82%, average hardness is about 2N, diameter is 2 ± 0.2mm, can reach customer requirements fully, does not also 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 TBBS granulated product is compared with powder-like product in mixing process, and its 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 binding agent, linking agent, dispersion agent, swelling agent etc., and is all very strong with the consistency of multiple rubber, consumption is few, 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 TBBS 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.

Example 1:

According to subordinate list 1 preparation binding agent; is that 18%TBBS wet feed join in agitator kettle with the ratio of the weight 1 ‰ of TBBS dry product with mass water content with the binding agent for preparing; 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 70 ℃ 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 TBBS powder.

Subordinate list 1: binding agent becomes to be grouped into

Composition	Weight/g
		Polyvidone	100
Vinyl acetate	55
		Whiteruss	50
Polyoxyethylene nonylphenol ether	4
		Methyltrimethoxy silane	1
Polyoxyethylene	0.5
		Sodium laurylsulfonate	0.5
NaHCO 3	0.1
		Water	200

Example 2:

According to subordinate list 2 preparation binding agents; is that 10%TBBS wet feed join in agitator kettle with the ratio of the weight 5 ‰ of TBBS dry product with mass water content with the binding agent for preparing; 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 75 ℃ 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 82.1%, average hardness can reach customer requirements fully about 2.00N, and product performance are compared indifference with the TBBS powder.

Subordinate list 2: binding agent becomes to be grouped into

Composition	Weight/g
		Polyvidone	120
Vinyl acetate	65
		Whiteruss	60

Polyoxyethylene octylphenol ether	5
		Vinyltrimethoxy silane	2
Polyoxyethylene	0.7
		Tripoly phosphate sodium STPP	0.8
NaHCO 3	0.3
		Water	220

Example 3:

According to subordinate list 3 preparation binding agents; is 1% to join in agitator kettle with the ratio of the weight 2% of TBBS dry product with TBBS wet feed mass water content with the binding agent for preparing; 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 80 ℃ 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 83.6%, average hardness can reach customer requirements fully about 2.00N, and product performance are compared indifference with the TBBS powder.

Subordinate list 3: binding agent becomes to be grouped into

Composition	Weight/g
		Polyvidone	140
Vinyl acetate	75
		Whiteruss	70
Octadecane alcohol radical Soxylat A 25-7	7
		The propyl group triacetoxysilane	5
Polyoxyethylene	1
		Fatty acid polyglycol ester	1
NaHCO 3	0.5
		Water	240

Although above the preferred embodiments of the present invention are described; 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 (5)

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

Polyvidone: 100-140 part,

Vinyl acetate: 55-75 part,

Whiteruss: 50-70 part,

Emulsifying agent: 4-7 part,

Silane crosslinker: 1-5 part,

Polyoxyethylene: 0.5-1 part,

Dispersion agent SDS:0.5-1 part,

NaHCO ₃: 0.1-0.5 part,

Water: 200-240 part.

2. binding agent as claimed in claim 1 is characterized in that described emulsifying agent is polyoxyethylene nonylphenol ether, polyoxyethylene octylphenol ether or octadecane alcohol radical Soxylat A 25-7.

3. binding agent as claimed in claim 1 is characterized in that described linking agent is methyltrimethoxy silane, vinyltrimethoxy silane or propyl group triacetoxysilane.

4. binding agent as claimed in claim 1 is characterized in that described dispersion agent is sodium laurylsulfonate, tripoly phosphate sodium STPP or fatty acid polyglycol ester.

5. the binding agent of the accelerator TBBS granulation of claim 1 is used for the accelerator TBBS prilling process, it is characterized in that step is as follows:

(1) weight percent 1 ‰～2% of binding agent by TBBS material dry product taken by weighing;

(2) binding agent that takes by weighing is added in the TBBS wet feed of mass water content≤18%, stir;

(3) mixture that stirs is added in the tablets press, extrude diameter 2 ± 0.2mm cylinder shape particle;

(4) put into belt dryer drying under 70 ℃～80 ℃;

(5) vibration screen separating particles and powder, the direct finished product packing of granular product on the screen cloth.