CN102417665B

CN102417665B - Method for reclaiming waste butyl rubber

Info

Publication number: CN102417665B
Application number: CN2011101764019A
Authority: CN
Inventors: 陈平轩
Original assignee: Hunan Liuyang Medical Instrument Factory
Current assignee: LIUYANG SANLI MEDICAL TECHNOLOGY DEVELOPMENT CO., LTD.
Priority date: 2011-06-28
Filing date: 2011-06-28
Publication date: 2012-12-19
Anticipated expiration: 2031-06-28
Also published as: CN102417665A

Abstract

The invention discloses a method for reclaiming waste butyl rubber. The overall scheme is as follows: modern physicochemical methods and a series of reclaiming processes are carried out on waste butyl rubber to destroy the original stereo network structure, so that the high-bond-energy C-C bond or C-N-C stereo network structure side chain is broken and recombined. The specific operation can be implemented by a stereo network structure-small network structure-coupled linear prepolymer-network compounding technical scheme. The invention can ensure no secondary pollution and low energy consumption on the premise of low investment, can be used for producing butyl reclaimed rubber which is compared favorably with the irradiation depolymerization product abroad, and endows the product with excellent processability in the subsequent processing process.

Description

A kind of renovation process of waste butyl rubber

Technical field

The present invention relates to a kind of regenerative use technology of waste butyl rubber.

Background technology

Butyl rubber (Isobutylene-Isoprene Rubber is abbreviated as IIR) is to be main (97-98%) with the polyisobutene, contains high saturation (or claiming low-unsaturation-degree) synthetic elastomer of a small amount of isoprene (2-3%).Butyl rubber has unique low-unsaturation-degree molecular structure (0.5-3.3% only; Be about tree elastomer 1/50); Be so far in all natural or viton; The synthetic elastic material that degree of unsaturation is minimum, chemical structure is the most stable, this glue kind have other synthetic and incomparable a series of excellent properties of tree elastomer.Unique thread-like molecule structure that butyl rubber has under the rubber state; In the article of manufacture process; After crosslinked (being commonly called as ' sulfuration ') formation netted (or title ' build ') structure; Be not main with bond energy lower C-S-C or C-Sn-C key usually, and almost be quite high C-C key of bond energy or C-N-C tridimensional network (similar) entirely with silicon, the crosslinked fluororubber structure type of high and low temperature resistance, chemical resistance excellence like other alkadiene rubber.In the C-N-C tridimensional network, C is the original filiform molecular structure of butyl rubber, and N is the typical structure of cross-linking set.Simultaneously; Because the pendant methyl distribution density is bigger in this molecular structure; The rubber item that has formed netted (or title ' build ') structure has also had the good resistance to air loss that obviously is superior to other glue kind goods when possessing excellent Ginkgo Biloba Leaf Extract, resistance to chemical attack, anti-ozone ageing ability.

Have above-mentioned distinctive molecular structure and stable chemical structure just because of the butyl rubber goods; Goods use properties forfeiture (as; Shape deterioration) or when going out of use after the disposable use; The basic no change of molecule crosslinked structure that it is unique, the survival state under the natural condition are difficult to change through traditional " regenerated rubber " (reclaimed rubber) mode of production.Traditional " regenerated rubber " complete processing belongs to organic solid castoff regenerated using category; Only refer to waste or used vulcanized rubber through physico-chemical processes such as pulverizing, heating, treat mechanically, make its production process from rubber capable of using elastic stage or reticulated structure " reduction " one-tenth plasticity and viscosity or linear structure, can revulcanization.

This be because; Traditional is " regenerated rubber " mode of production of master with " heating " (also title ' high temperature desulfurizing '); Alkadiene rubber to being the master with lower C-S-C of bond energy or C-Sn-C key produces effect; But can't reach C-C key or the C-N-C tridimensional network that bond energy is quite high is main, the splendid discarded butyl rubber goods " reticulated structure " of thermotolerance, becomes the purpose of available " linear structure " through chain rupture " reduction ".

The initial product of waste butyl rubber is different still more, and used linking agent is different, and the crosslink type of formation is also far from each other, with a kind of " regeneration " method, is difficult to the discarded butyl rubber goods of all crosslink types are proved effective.The waste butyl rubber goods that are the main body with the abandoned car inner tube of a tyre; System adopts many sulphur or the sulfuration of low sulfur crosslinking agent to form; Wherein there are a small amount of C-S-C or C-Sn-C cross-link bond to exist; " heating " in tradition " regenerated rubber " mode of production (also claiming ' high temperature desulfurizing ') can produce limited " chain rupture " effect to a small amount of C-S-C or the C-Sn-C cross-link bond of such waste butyl rubber goods; The waste butyl rubber goods that are the main body with tire curing bladder, medical microbiotic bottle stopper; Hydroxy resin class linking agent+burning agent or the metal chlorides of adopting vulcanize more; It is main that cross-linked form does not have sulphur IPN cubic network composite structure with C-C key, pendant hydroxyl group, side alkyl; Product strength is compared with many sulphur or low sulfur crosslinking agent sulfurized butyl rubber goods with modulus; Bigger difference is arranged, and " physical and chemical processes such as pulverizing, heating, treat mechanically " in traditional " regenerated rubber " working method are to the recovery of such waste butyl rubber goods, handle and be difficult to prove effective.

Up to the present, except with " heating " (also claim ' high temperature desulfurizing ') being master's tradition " regenerated rubber " the mode of production, also having a kind of is " irradiation method " regeneration techniques of master with " irradiation desulfurization " (actual is ' depolymerization reaction '); Promptly; " low-temperature deep " (196 ℃) mode through the liquid nitrogen freezing case; After waste butadiene rubber processed ultra-fine rubber powder in advance, shear, under the high-power electron beam radiation that rumbatron produces through brute force; Through " irradiation desulfurization " waste butyl rubber goods big " reticulated structure " are degraded to little " reticulated structure ", and then produce butyl reclaimed rubber.But this method is a kind of operational path high, high energy consumption of investing, and high production cost makes it can't realize suitability for industrialized production so far.

Summary of the invention

In order to solve above-mentioned drawback, technical problem to be solved by this invention is, a kind of renovation process of waste butyl rubber is provided, and can realize the regenerated using of waste butyl rubber, has the characteristics of low investment, less energy-consumption.In order to solve the problems of the technologies described above, the technical scheme that the present invention adopts is, a kind of renovation process of waste butyl rubber is characterized in that, comprises following process step,

One, cleaning, screening, removal of impurities: the discarded butyl rubber goods of recovery because pollute or contain that sandstone and other glue kind goods etc. must clean, screening, removal of impurities handle.

Two, desulfurization, exercise: destroy the tridimensional network of waste butyl rubber goods to greatest extent, make it to level off to " the little reticulated structure " of " wire ".

Three, a kind of jade closes reaction, and obtaining multiple spot active " coupling " performed polymer is composite gel.

Four, the thick refining and the refining of composite gel.

Beneficial effect of the present invention is; Adopt technique scheme; Can under the less prerequisite of investment, guarantee non-secondary pollution, less energy-consumption, produce the butyl reclaimed rubber that can compare favourably, give excellent processability in this product following process process with the product of external " irradiation depolymerization ".

To combine embodiment that the present invention is described further below.

Embodiment

The renovation process of said waste butyl rubber comprises following process step,

One, cleaning, screening, removal of impurities: the discarded butyl rubber goods of recovery because pollute or contain that sandstone and other glue kind goods etc. must clean, screening, removal of impurities handle.Generally the method through physics can realize; Remove the primary surface pollutent with high pressure water washing again after the butyl rubber goods that reclaim are soaked with recirculated water; Butyl rubber goods normal temperature after the cleaning dries the back and sieves, selects through manual work; Remove sandstone, glass cullet, aluminium flake and other glue kind goods etc., to guarantee the nontoxic and purity of shoddy.

Two, desulfurization, exercise: destroy the tridimensional network of waste butyl rubber goods to greatest extent, make it to level off to " the little reticulated structure " of " wire ", realize this goal; Can pulverize successively through opening rubber mixing machine, repeatedly roll off, bundling are put; The storing time was not less than 24 hours, repeated this road technology five times at least, and each successively decreases all over the roll spacing of the subsequent handling opening rubber mixing machine of roll off; Film smooth surface behind roll off, the thick 1.5mm of sheet.

Three, a kind of jade closes reaction; Obtain multiple spot active " coupling " performed polymer: this target mainly realizes through the kneading process, according to common kneading technology, lets properties-correcting agent, vulcanization accelerator and film thorough mixing react; Thereby obtain " coupling " performed polymer of many active sites, i.e. composite gel.

Four, the thick refining and the refining of composite gel: the softening back of the thick refining of composite gel slabbing; Flaky composite gel is broken into the triangle bag carry out repeatedly refining (at least 5 times); Make its density, internal stress even relatively; According to the thickness slice of sulfuration needs, so far can obtain smooth surface, the uniform butyl reclaimed rubber sheet of thin and thick.

Working method of the present invention is mainly accomplished by following equipment:

The detail operations of each production stage is accomplished according to the requirement of known equipment regulation.In the per pass operation that prevents to regenerate, because the high temperature damage equipment (shortening the work-ing life of equipment) that physics extruding or chemical reaction produce or cause industrial chemicals such as properties-correcting agent to decompose volatilization, can be through recirculated water to the machinery and equipment processing of lowering the temperature.

Claims

1. the renovation process of a waste butyl rubber is characterized in that, comprises following process step,

One, cleaning, screening, removal of impurities; The discarded butyl rubber goods that reclaim are owing to pollute or contain sandstone and other glue kind goods must clean, screening, removal of impurities are handled: remove its surface contaminant with high pressure water washing again after the butyl rubber goods that reclaim are soaked with recirculated water; Butyl rubber goods normal temperature after the cleaning dries the back and sieves, selects through manual work; Remove sandstone, glass cullet, aluminium flake and other glue kind goods, to guarantee the nontoxic and purity of shoddy;

Two, desulfurization, exercise: the tridimensional network that destroys the waste butyl rubber goods to greatest extent; Make it to level off to " the little reticulated structure " of " wire ": through opening rubber mixing machine pulverize successively, repeatedly roll off, bundling are put; The storing time was not less than 24 hours, repeated this road technology five times at least, and each successively decreases all over the roll spacing of the subsequent handling opening rubber mixing machine of roll off; Film smooth surface behind roll off, the thick 1.5mm of sheet;

Three, a kind of jade closes reaction; Obtain multiple spot active " coupling " performed polymer, realize:, let properties-correcting agent, vulcanization accelerator and film thorough mixing react according to common kneading technology through the kneading process; Thereby obtain " coupling " performed polymer of many active sites, i.e. composite gel;

Four, the thick refining and the refining of composite gel: the softening back of the thick refining of composite gel slabbing; Flaky composite gel is broken into the triangle bag carry out at least 5 refinings; Make its density, internal stress even relatively; According to the thickness slice of sulfuration needs, so far can obtain smooth surface, the uniform butyl reclaimed rubber sheet of thin and thick.