CN1033916C

CN1033916C - Method for prodn. of flexible graphite weaving filler

Info

Publication number: CN1033916C
Application number: CN94118338A
Authority: CN
Inventors: 章珏
Original assignee: SEALING ELEMENTS FACTORY XIAOSHAN CITY
Current assignee: Guotai Seal Material Co., Ltd., Zhejiang Prov.
Priority date: 1994-11-22
Filing date: 1994-11-22
Publication date: 1997-01-29
Anticipated expiration: 2014-11-22
Also published as: CN1106443A

Abstract

The present invention relates to a method for the production of a flexible graphite weaving filler, which comprises the following steps: graphite worms are pressed into a graphite belt material, and reinforcing materials are coated with glue; the reinforcing materials are compounded and dried; then, the graphite worms are pressed again, cut and coiled or twisted, woven or shaped. The method has the advantages of simple and reasonable technology, convenient manufacture and low cost; graphite packing manufactured by the method has high graphite content, small content of adhesive agent, favorable binding property between graphite, and graphite and reinforcing materials, favorable packing flexibility, reliable quality, favorable sealing performance during use, no harmful influence on metal materials.

Description

Produce the method for soft graphite braided packing

The present invention relates to a kind of method of producing the soft graphite braided packing, belong to a kind of manufacturing process of a kind of material of fluid medium sealing usefulness.

For the flexible packing made from graphite (or claiming filler), its quality depend between the graphite phosphorus sheet and and strongthener between bonding strength, in theory, content of graphite is high more, caking agent content is more little, it is flexible and shaping characteristic is good more, quality is high more.

Chinese patent CN-87106668 discloses a kind of universal packing of expanded graphite and manufacture method, graphite packing wherein is raw material with the expanded graphite, and contain and be useful on the subsidiary material of gaining in strength, subsidiary material wherein are the fiber or the synthetic film of wire or textile-like, the surface impregnation of subsidiary material has a kind of with former, organic class caking agent butyronitrile that auxiliary material all adapts, neoprene, vinyl acetate, and these subsidiary material are evenly to be pressed together on the expanded graphite worm interlayer; Its manufacture method is that expanded graphite worm is become band with mechanical compaction, and roll into tubular, wherein before mechanical compression molding, earlier in wire, dipping is with former on the enhancing subsidiary material of membranaceous or textile-like, organic class caking agent that auxiliary material all adapts, in temperature is to carry out drying under 20～100 ℃ of conditions, then the expanded graphite worm layer is covered equably the surface of subsidiary material, under the pressure of 0.1～150KG/CM2, carry out machinery and be pressed into band, and through cutting, twist and close, under 120～180KG/CM2 pressure, push then or roll-in die orifice shaping processing, make required packing, the problem that this product exists has: the caking agent of selecting for use not only sulphur and cl content height has certain corrosive nature to mechanical part, and volatility is big, bonding strength is low, the finished product storage time is short, water can infiltrate in the packing (filler), and because its manufacturing process is unreasonable, make that the control of glue content is difficult, cementability is poor between the graphite worm layer, is rolling, twist close and the braiding process in can fall down many graphite phosphorus sheets.

U.S. Pat-3404061 discloses a kind of flexible graphite sheet material, and technology wherein is with soaker or additive combination or is mixed in the graphite, is pressed into sheet material then, applies caking agent at plate surface again, cutting again, stubborn sth. made by twisting, braiding; This method applies caking agent at plate surface, controls so the content of caking agent is difficult, influences the quality product of the packing of final molding.

U.S. Pat-4455334 discloses a kind of packing that is made of composite sheet, and a lateral reticulated structure of this graphite sheet and embedding expanded graphite plate is compound by mechanical compaction or caking agent integral body; It is not high that this method is carried the content of graphite in the packing, influences the remaining mass of packing.

Japan JP 52-109511 patent disclosure communique discloses a kind of graphite sheet, Japan JP 52-92216 patent disclosure communique discloses a kind of pliability graphite sheet of expanded graphite, Japan JP-61-143483 patent disclosure communique discloses a kind of pliability graphite packing, in these patents, the scheme that adopts neoprene latex is arranged, useful metal paper tinsel or paper or heat resistance fiber weave cotton cloth or net as the scheme of strongthener, it is numerous that processing method has letter also to have, but all can not make the content of graphite height, between the little and graphite of caking agent content and the graphite packing that has the extra best best of good cementability between graphite and strongthener with the most rational processing method and condition.

The objective of the invention is to overcome the deficiencies in the prior art and a kind of method of producing the soft graphite braided packing is provided, adopt this method can make technology reasonable, make easy, cost is low, and the content of graphite height of the graphite packing of manufacturing has good cementability between the little and graphite of caking agent content and between graphite and strongthener, the reliable in quality of packing, flexibility is good, good seal performance during use, and to worked around metallic substance have no adverse effects.

The method of production soft graphite of the present invention braided packing may further comprise the steps:

A) be pressed into graphite tape with graphite worm;

B) kiss-coating of strongthener;

C) at one side of graphite tape composite reinforcing material;

D) oven dry;

E) suppress the last layer graphite worm again at the other side of the strongthener that is compounded with graphite tape;

F) cut the graphite of moulding and the composite bed band of strongthener;

G) roll or twist and close;

H) integer and the surface treatment of braiding and final filler.

The method of production soft graphite of the present invention braided packing, technology is simple, reasonable, make easy, cost is low, and the content of graphite height of the graphite packing of manufacturing has good cementability between the little and graphite of caking agent content and between graphite and strongthener, the flexibility of packing is good, reliable in quality, good seal performance during use, and to worked around metallic substance have no adverse effects.

For introducing the method for production soft graphite of the present invention braided packing in detail, be elaborated below in conjunction with accompanying drawing:

Fig. 1 is the schematic flow sheet of the method for production soft graphite of the present invention braided packing.

Referring to Fig. 1, the method for production soft graphite of the present invention braided packing may further comprise the steps:

A) be pressed into graphite tape with graphite worm; Graphite worm wherein is to be raw material with natural scale graphite or powder graphite, and after the strongly-acid oxide treatment made it to become compound between graphite layers, washing and drying high temperature instantaneous expansion again became graphite worm; It comprises the graphite worm 2 that from hopper 1, falls by the zone face that is contained in round-robin travelling belt 3 upper and lower pressure roller 4 is carried out preliminary compression moulding and ironed in inferior pressure roller 6 again to the graphite tape 5 of pre-profiling; Can mix the pressed powder adhesive glue of prior art this moment in the graphite worm raw material, in the drying course below, allows and lean on this solid adhesive bonding between graphite;

B) give the kiss-coating of strongthener; The shape of strongthener wherein can be varied, is wire or woven mesh or laminar for example, perhaps they made up arbitrarily, and the selecting materials of strongthener can be linen-cotton class or metal species or synthon class or inorganic fibre or its and make up arbitrarily; Silk thread for example, Stainless Steel Wire, well known materials such as carbon fiber; The glue that strongthener is hung can adopt prior art, the glue of various compositions mentioned above for example, and best is the acrylate water-soluble polymers, because the amount that this glue contains hazardous substance is little, adhesiveproperties is good, and flexibility is good, volatilization is few, and the finished product storage time is long, and anti-water permeation performance is good; The method of strongthener 7 kiss-coatings is to allow strongthener from containing two of glue to passing the sponge rubber roll 8 that rolls, and kiss-coating amount and uniformity coefficient are all more easy to control like this;

C) on one side of the graphite tape 5 of moulding compound on strongthener 7; For the strongthener of silk thread shape, graphite tape has obtained " stiffening web " of vertical distribution;

D) oven dry; Bake out temperature depends on the composition of glue, for this glue of acrylate water-soluble polymers, bake out temperature is elected 180～260 ℃ as, oven dry should proceed to composition board from moisture eliminator 9, come out after, only slightly a bit sticking hand of sense is good, moisture eliminator 9 has varied, can be with infrared heating plate heating, also can be allowed to condition at air-dry in the drying tunnel;

E) suppress the last layer graphite worm again at the other side of the graphite tape that is compounded with strongthener; Before entering this step, very do not fit between strongthener and the graphite tape, graphite worm 2 under adding from secondary hopper 11 is fallen on the band that is transmitting, by the compound again last layer graphite worm of composite press roller 10, it is higher to make it bonding strength according to " coarse " face of not fitting between strongthener and the graphite tape;

F) cut the graphite of moulding and the composite bed band of strongthener; The composite graphite band of final molding enters brokenly band mechanism 12 and cuts into required faciola, is coiled in the drum mechanism 13;

G) roll or twist and close; Faciola through spiral roll, sub-thread or multiply twist and close, cross in the kind at this, the heart adds tinsel or nonmetal silk thread or its and makes up arbitrarily therein, the purpose that adds is except adjusting proportion, the more important thing is and gain in strength, for making the situation that silk thread is not broken in the subsequent processing, silk thread also participates in being wound into the spring-like with retractility;

H) integer and the surface treatment of braiding and final filler; Through above-mentioned steps twist the fine rule twist with the fingers again through cover compile, repeat to compile, various weaving methods such as grid volume, punching volume are processed into the expanded graphite packing with improved flexibility, finally in addition shaping and necessary surface treatment get product.

Claims

1, a kind of method of producing the soft graphite braided packing is characterized in that comprising:

A) be pressed into graphite tape with graphite worm; Graphite worm wherein is to be raw material with natural scale graphite or powder graphite, and after the strongly-acid oxide treatment made it to become compound between graphite layers, washing and drying high temperature instantaneous expansion again became graphite worm; It comprises the graphite worm that from hopper, falls by the zone face that is contained in the round-robin travelling belt upper and lower pressure roller is carried out preliminary compression moulding and ironed in inferior pressure roller again to the graphite tape of pre-profiling; Can mix acrylic binder this moment in the graphite worm raw material;

B) give the strongthener kiss-coating; The shape of strongthener wherein can, be wire or woven mesh or laminar, strongthener can be selected from silk thread, wire, carbon fiber; The glue that strongthener is hung can adopt the acrylate water-soluble polymers; The method of strongthener kiss-coating is to allow strongthener from containing two of glue to passing kiss-coating amount easy to control like this and uniformity coefficient the sponge roller that rolls;

C) on one side of the graphite tape of moulding compound on strongthener; For the strongthener of silk thread shape, graphite tape has obtained " stiffening web " of vertical distribution;

D) oven dry, bake out temperature is 180～260 ℃;

E) suppress the last layer graphite worm again at the other side of the graphite tape that is compounded with strongthener; Before entering this step, very do not fit between strongthener and the graphite tape, graphite worm under adding from the secondary hopper is fallen on the band that is transmitting, by the compound again last layer graphite worm of composite press roller, it is higher to make it bonding strength according to " coarse " face of not fitting between strongthener and the graphite tape;

F) cut the graphite of moulding and the composite bed band of strongthener; The composite graphite band of final molding enters brokenly band mechanism and cuts into required faciola, is coiled in the drum mechanism;

G) roll or twist and close; Faciola through spiral roll, sub-thread or multiply twist and close, in this crossed kind, the heart added tinsel or nonmetal silk thread or its and makes up arbitrarily therein;

H) integer and the surface treatment of braiding and final filler; Through twisting the fine rule twist with the fingers again through cover compile, repeat to compile, various braidings such as grid volume, punching volume and be processed into expanded graphite packing with improved flexibility, finally in addition shaping and surface treatment get product.