CN112442816A - Heat setting method for high-strength hard wire rope impregnation process - Google Patents
Heat setting method for high-strength hard wire rope impregnation process Download PDFInfo
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- CN112442816A CN112442816A CN202011345140.4A CN202011345140A CN112442816A CN 112442816 A CN112442816 A CN 112442816A CN 202011345140 A CN202011345140 A CN 202011345140A CN 112442816 A CN112442816 A CN 112442816A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B15/00—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/02—Machine details; Auxiliary devices
- D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
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Abstract
The invention discloses a heat setting method for a high-strength hard wire rope impregnation process, which comprises the steps of firstly, pre-impregnating a wire rope in a first impregnation tank, then, drying the wire rope in a first-zone drying oven at the temperature of 200-. The method only changes the process flow of the original equipment, the pre-dipped cord is dried by the first-zone oven and then directly enters the second-zone oven, the curing length of the cord is increased by the second-zone oven, the full crosslinking of the epoxy resin in the dipping treatment process is promoted, and the finally obtained cord has the advantages of smooth surface, smooth adhesion of internal fibers, high solidification and good cohesion performance, meets the requirement on the transverse cutting performance of the product, and enlarges the sale and use range.
Description
Technical Field
The invention belongs to the field of cord processing, and particularly relates to a heat setting method for a high-strength hard cord gumming process.
Background
The gum dipping heat treatment processing process of the polyester gum dipping thread rope is a complex process, physical change, chemical change and reaction among macromolecules simultaneously occur in the process, and the final result is that the binding force of the thread rope and rubber is improved, the requirement of a client on the cutting performance of a product is met, so that the physical and chemical properties of the thread rope are improved, and the strength, the elongation and the shrinkage of the thread rope all meet the using requirements of a manufacturer.
In the fiber reinforced rubber composite material, the quality of the bonding performance of the interface directly determines the quality of the performance of the composite material. Hydrogen bond-forming groups are present in rayon, nylon and polyamide cord reinforcements, and rayon contains a high concentration of hydroxyl groups capable of forming hydrogen bonds and is therefore easily adhered; nylon contains more imino groups, and the bonding performance of the nylon is inferior to that of rayon; aromatic polyamides have the worst adhesive properties because the steric hindrance of the bulky aromatic group makes it difficult to form a hydrogen bond, although an imino group is present. The hydroxyl and imino groups provide primarily reactive groups for interfacial adhesion, and the presence of polar groups also facilitates molecular interactions. The polyester thread lacks functional groups for forming hydrogen bonds, and the key for promoting the adhesion of the polyester thread and the inner layer adhesive is the mutual diffusion effect of the matrix and the adhesive, and the difficulty degree of the mutual diffusion is related to the thermodynamic compatibility among the components.
The way to obtain good adhesion between the cord and the rubber is continuously explored, and some documents already well summarize the work of the predecessors, but most of the literature focuses on the improvement of the formula of the glue solution. Because the polyester cord has low polarity, does not have a group forming a hydrogen bond and has high crystallinity, the dipping solution is difficult to permeate into the polyester cord, and therefore the polyester cord cannot be well adhered to rubber by the dipping solution. New treatments must therefore be explored to improve the adhesion of polyester cords to rubber.
The gumming hard cord is a framework material which is produced by adopting high modulus and is mainly applied to V belts and V-ribbed belts, the product has high strength, low elongation and stable size, can achieve excellent adhesion effect with chloroprene rubber, and the gumming process flow in the production process of the hard cord is as follows: the method comprises the steps of cord-pre-dipping-drying-deblocking-RFL dipping-drying-sizing-dipping. The high-modulus wire product only needs to be dried by a drying oven after being dipped and dipped for the first time at present, then is dried and shaped by two drying ovens with different heating temperatures after being dipped for the second time, and the produced high-modulus wire hard cord has good cohesion and meets the cutting performance requirement and the bonding requirement of the product.
Along with market development and change and the requirement of cost control, the high-modulus wire can not meet the production requirement gradually, the high-strength wire has the characteristics of small relative density, small hygroscopicity, high strength, wear resistance, acid and alkali resistance and low heat conductivity, the unit price of the high-strength wire is lower than that of the high-modulus wire, and the high-strength wire is used for replacing the high-modulus wire to produce the gum dipping hard cord. However, for high-strength yarn products, the same production process as that for high-modulus yarns is adopted, the finally obtained yarn and rope have low adhesive force, and the structure becomes fluffy and insufficient in hardness, so that the cutting requirements of customers on hard yarn and rope products cannot be met.
Disclosure of Invention
The invention aims to provide a novel gum dipping and shaping method, which not only technically improves the gum dipping effect of a cord and the adhesive force between the cord and a gum solution, but also explores the curing temperature and time of heating the cord by an oven by improving the gum dipping and drying forms, and produces a high-strength silk rope product meeting the performance requirements.
In order to achieve the purpose, the invention adopts the technical scheme that:
a heat setting method for a high-strength hard wire rope gum dipping process comprises the following steps:
s1: the cord is pre-impregnated with glue in a glue dipping tank and then enters a first-zone drying oven for drying;
s2: the cord directly enters a second-zone oven from the first-zone oven for continuous drying and then enters a second impregnation tank for impregnation;
s3: and (4) after the two-step gum dipping, enabling the cotton rope to enter a three-zone oven for shaping, and then cooling to obtain a finished product.
Further, the gum dipping speed in the first gum dipping tank and the second gum dipping tank is 30-35 m/min, and residual slurry is scraped in a glue scraping mode of a glue scraping plate after gum dipping.
Further, the temperature of the first-zone oven is 200-220 ℃, and the stay time of the wire rope in the first-zone oven is 90-120S.
Further, the temperature of the two-zone oven is 225-245 ℃, and the stay time of the wire rope in the two-zone oven is 90-120S.
Further, the temperature of the three-zone oven is 200-240 ℃, and the stay time of the wire rope in the three-zone oven is 90-120S.
Furthermore, automatic tensioners are arranged in the first-zone drying oven, the second-zone drying oven and the third-zone drying oven, the stretching between the first-zone drying oven and the second-zone drying oven is 0 +/-0.5%, and the stretching between the second-zone drying oven and the third-zone drying oven is 1 +/-1%; the three-zone inter-oven stretch was 1.5 ± 1.5%.
Compared with the prior art, the invention has the beneficial effects that: compared with the prior art, the method only changes the process flow of the prior equipment under the principles of not increasing the space of a workshop occupied by a dip tank and an oven, increasing energy consumption and increasing cost, the pre-dipped cord is dried by the first-zone oven, removing moisture, then directly enters the second-zone oven, the temperature of the second-zone oven is increased to 225 and 245 ℃, the curing length of the cord is increased by the second-zone oven, the epoxy resin is fully crosslinked in the dipping treatment process, the epoxy groups react as completely as possible under the action of a ring, the oxygen glue layer and the RFL dip layer interact, the cord cured by the first-zone oven and the second-zone oven is subjected to secondary mucilage, the bonding capability of the fibers is further enhanced, the three-zone oven is dried, the bonding performance of the cord is ensured to be excellent, and the finally obtained cord has smooth surface, smooth internal fibers, smooth bonding and high solidification of the internal fibers, The product quality is improved, the performance requirement of cord cutting is met, and the sale and use range is enlarged; meanwhile, the cost is saved, the energy consumption is reduced, the enterprise benefit is improved, and a better economic value is created.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, specific embodiments thereof will be described in detail with reference to the following examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
Adopting a gumming machine with 3 drying heat treatment ovens, wherein the ovens are provided with automatic tensioners with the model number of YG302, a cord re-twisting cylinder is arranged on a machine and then passes through a magnetic eye to be guided away by a wiring frame, then the cord passes through a tension frame and enters a gumming groove for pre-gumming, the gumming speed is 32 m/min, the cord is completely soaked by mucilage, the cord is pre-gummed by the gumming groove and then is drawn into a first-zone oven, the temperature of the oven is set to 215 ℃, the staying time of the cord in the first-zone oven is 90S, the stretching is 0 +/-0.5 percent during the first-zone oven, the cord is preheated and dried, then the cord directly enters a second-zone oven, the temperature of the oven is set to 238 ℃, the staying time of the cord in the second-zone oven is 90S, the stretching is 1 +/-1 percent during the first-zone oven, the cord is further dried and cured at high temperature, then, and (3) highly curing, then, enabling the cord to enter a three-zone oven, setting the temperature of the oven to be 230 ℃, enabling the stay time of the cord in the three-zone oven to be 120S, stretching the cord to be 1.5 +/-1.5%, and drying at a high temperature and then winding to obtain a finished product.
The adhesive force of the finally prepared polyester impregnated cord is 300N/cm, the hardness is 2.0N, the surface is smooth, and the prepared polyester impregnated cord is used in the fields of V belts, V-ribbed belts and the like.
Example 2
Adopting a gumming machine with 3 drying heat treatment ovens, installing an automatic tensioner with the model of YG302 in the ovens, leading a cord re-twisting cylinder on the machine through a magnetic eye and a wiring rack, then leading the cord into a first gumming groove through a tension rack and a cord for pre-gumming at a gumming speed of 32 m/min, completely soaking the cord by a mucilage, pre-gumming the cord by the first gumming groove, then drawing the cord into a first area oven, setting the temperature of the oven to be 215 ℃, setting the retention time of the cord in the first area oven to be 90S, stretching the cord to be 0 +/-0.5 percent, preheating and drying the cord, then directly feeding the cord into a second area oven, setting the temperature of the oven to be 240 ℃, setting the retention time of the cord in the second area oven to be 90S, stretching the cord to be 1 +/-1 percent, further drying and curing the cord at high temperature, then feeding the cord into the second gumming groove, enabling fibers in the cord to, setting the temperature of the oven to 240 ℃, setting the stay time of the cord in the three-zone oven to 90S, stretching the cord to 1.5 +/-1.5 percent, drying at high temperature and winding to obtain a finished product.
The adhesive force of the finally prepared polyester impregnated cord is 320N/cm, the hardness is 2.4N, the surface is smooth, and the prepared polyester impregnated cord is used in the fields of V belts, V-ribbed belts and the like.
Comparative example 1
The method comprises the steps of adopting a traditional thread rope gumming and drying process, enabling a thread rope to enter a first-zone oven after passing through a gumming groove for presoaking at a speed of 32 m/min, setting the temperature of the first-zone oven to be 215 ℃, enabling the stay time of the thread rope in the first-zone oven to be 90S, then enabling the thread rope to enter a second-zone oven for drying after passing through a second gumming groove for gumming at a speed of 32 m/min, setting the temperature of the second-zone oven to be 160 ℃, enabling the stay time of the thread rope in the second-zone oven to be 90S, finally enabling the thread rope to enter a third-zone oven, setting the temperature of the third-zone oven to be 238 ℃, enabling the stay time of the thread rope in the third-zone oven to be 120S, and finally enabling the adhesive force of the prepared polyester gummed thread rope to be 280N/cm.
Comparative example 2
The cord enters a gumming groove for pre-gumming, the gumming speed is 32 m/min, the cord is completely soaked by the mucilage, the cord is pre-gummed by the gumming groove and then is pulled to enter an area oven, the temperature of the oven is set to be 215 ℃, the stay time of the cord in the area oven is 90S, preheating and drying the cotton rope, then directly entering a second-zone oven, setting the temperature of the oven to be 160 ℃, setting the stay time of the cotton rope in the second-zone oven to be 90S, then the thread rope enters a second impregnation tank, the fibers in the thread rope are bonded and highly cured, and then, the cord enters a three-zone oven, the temperature of the oven is set to be 240 ℃, the stay time of the cord in the three-zone oven is 120S, the adhesive force of the finally prepared polyester gum dipping cord is 290N/cm, the hardness is 1.8N, the cohesion performance of the obtained finished cord is poor, and the cut finished cord is easy to generate defect and cannot meet the production requirements of partial products.
Comparative example 3
The method is characterized in that a traditional thread rope gumming and drying process is adopted, but only the temperature of an oven is changed, a thread rope enters a first-zone oven after being presoaked in a first gumming groove, the temperature of the first-zone oven is set to 215 ℃, the stay time of the thread rope in the first-zone oven is 90S, then the thread rope enters a second-zone oven after being gummed in a second gumming groove for drying, the temperature of the second-zone oven is set to 240 ℃, the stay time of the thread rope in the second-zone oven is 90S, finally the thread rope enters a third-zone oven, the temperature of the third-zone oven is set to 240 ℃, the stay time of the thread rope in the third-zone oven is 120S, the adhesive force of the finally prepared polyester gummed thread rope is 290N/cm, the hardness is 1.6N, the cohesive property of.
According to the tests, the curing length of the cotton rope can be increased to a certain extent by increasing the drying temperature of the cotton rope, and the holding capacity between fibers in the cotton rope is improved, but because the melting point of the polyester fiber is about 250 ℃ and is limited by set equipment, the purpose of improving the holding capacity of the cotton rope cannot be achieved by simply increasing the temperature of an oven and the drying time in production, and the performance improvement of the cotton rope by only changing the position of the oven cannot meet the product requirement. The adhesion and hardness of the cords produced in comparative examples 1-3 are inferior to those of the cords obtained in examples 1 and 2, and the cutting performance is even less satisfactory for some of the product requirements. On the basis of the existing equipment, the invention comprehensively considers, correspondingly adjusts the process steps according to the performance of the raw materials, changes the process exposition, and achieves the purpose of producing the high-strength hard wire rope product meeting the performance requirements by using the high-strength wire.
The above-described examples are merely illustrative of preferred embodiments of the present invention and do not limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and principles of this invention, and it is intended to cover such modifications and alterations in the invention as fall within the true spirit and scope of the appended claims.
Claims (6)
1. A heat setting method for a high-strength hard wire rope gum dipping process is characterized by comprising the following steps:
s1: the cord is pre-impregnated with glue in a glue dipping tank and then enters a first-zone drying oven for drying;
s2: the cord directly enters a second-zone oven from the first-zone oven for continuous drying and then enters a second impregnation tank for impregnation;
s3: and (4) after the two-step gum dipping, enabling the cotton rope to enter a three-zone oven for shaping, and then cooling to obtain a finished product.
2. The heat setting method for the high-strength hard wire rope gumming process according to claim 1, characterized in that: the gum dipping speed in the first gum dipping tank and the second gum dipping tank is 30-35 m/min, and residual slurry is scraped in a glue scraping mode of a glue scraping plate after gum dipping.
3. The heat setting method for the high-strength hard wire rope gumming process according to claim 1, characterized in that: the temperature of the first-zone oven is 200-220 ℃, and the stay time of the ropes in the first-zone oven is 90-120S.
4. The heat setting method for the high-strength hard wire rope gumming process according to claim 1, characterized in that: the temperature of the second-zone oven is 225-245 ℃, and the stay time of the wire rope in the second-zone oven is 90-120S.
5. The heat setting method for the high-strength hard wire rope gumming process according to claim 1, characterized in that: the temperature of the three-zone oven is 200-240 ℃, and the stay time of the ropes in the three-zone oven is 90-120S.
6. The heat setting method for the high-strength hard wire rope gumming process according to claim 1, characterized in that: automatic tensioners are arranged in the first-zone drying oven, the second-zone drying oven and the third-zone drying oven, the stretching between the first-zone drying oven and the second-zone drying oven is 0 +/-0.5%, and the stretching between the second-zone drying oven and the third-zone drying oven is 1 +/-1%; the three-zone inter-oven stretch was 1.5 ± 1.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011345140.4A CN112442816A (en) | 2020-11-26 | 2020-11-26 | Heat setting method for high-strength hard wire rope impregnation process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011345140.4A CN112442816A (en) | 2020-11-26 | 2020-11-26 | Heat setting method for high-strength hard wire rope impregnation process |
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| CN112442816A true CN112442816A (en) | 2021-03-05 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3307966A (en) * | 1963-10-29 | 1967-03-07 | Du Pont | Shaped structures treated with polyepoxide and polyisocyanate for improving adherence to rubbers |
| CN106084362A (en) * | 2016-06-28 | 2016-11-09 | 江苏太极实业新材料有限公司 | A kind of environmentally friendly fibre framework materials dipping solution and gum dipping process |
| CN107574670A (en) * | 2017-09-13 | 2018-01-12 | 联新（开平）高性能纤维有限公司 | Cord fabric warp thread dipping solution and the cord fabric warp thread prepared and preparation method and application |
| CN110067127A (en) * | 2019-03-20 | 2019-07-30 | 青岛中维新材料有限公司 | A kind of preparation method of impregnation aramid fiber short fibre |
-
2020
- 2020-11-26 CN CN202011345140.4A patent/CN112442816A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3307966A (en) * | 1963-10-29 | 1967-03-07 | Du Pont | Shaped structures treated with polyepoxide and polyisocyanate for improving adherence to rubbers |
| CN106084362A (en) * | 2016-06-28 | 2016-11-09 | 江苏太极实业新材料有限公司 | A kind of environmentally friendly fibre framework materials dipping solution and gum dipping process |
| CN107574670A (en) * | 2017-09-13 | 2018-01-12 | 联新（开平）高性能纤维有限公司 | Cord fabric warp thread dipping solution and the cord fabric warp thread prepared and preparation method and application |
| CN110067127A (en) * | 2019-03-20 | 2019-07-30 | 青岛中维新材料有限公司 | A kind of preparation method of impregnation aramid fiber short fibre |
Non-Patent Citations (1)
| Title |
|---|
| 王孟钟: "《浸胶帘子布性能影响研究》", 化学工业出版社, pages: 551 * |
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