阅读说明：本技术 一种芳纶耐高温骨架材料的生产方法 (Production method of aramid fiber high-temperature-resistant framework material ) 是由 石杰 方友林 欧正清 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种芳纶耐高温骨架材料的生产方法,包括以下制备步骤：步骤一：获取芳纶织物；步骤二：制备浸渍液,浸渍液包括原料间二苯酚、糠醛、去离子水、烧碱、羧基乙丙胶乳和氨水,浸渍液的具体制备步骤包括：首先将间二苯酚与糠醛加入到去离子水中配置成酚醛树脂溶液,再依次向酚醛树脂溶液中加入烧碱、羧基乙丙胶乳和氨水制得混合液,最后将混合液放置7～9h,制得浸渍液；步骤三：预处理；步骤四：浸渍处理；步骤五：高温烘燥。本发明针对现有技术中芳纶骨架材料耐高温性能差,芳纶骨架材料与橡胶的粘结性能差等问题进行改进,本发明具有提高芳纶骨架材料的耐高温性能,提高芳纶骨架材料与橡胶的粘结强度等优点。(The invention discloses a production method of an aramid fiber high-temperature-resistant framework material, which comprises the following preparation steps: the method comprises the following steps: obtaining aramid fiber fabric; step two: preparing a steeping fluid, wherein the steeping fluid comprises raw materials of resorcinol, furfural, deionized water, caustic soda, carboxyl ethylene propylene latex and ammonia water, and the specific preparation steps of the steeping fluid comprise: firstly, adding m-diphenol and furfural into deionized water to prepare a phenolic resin solution, then sequentially adding caustic soda, carboxyl ethylene propylene latex and ammonia water into the phenolic resin solution to prepare a mixed solution, and finally, standing the mixed solution for 7-9 hours to prepare an impregnation solution; step three: pre-treating; step four: dipping treatment; step five: and (5) drying at high temperature. The invention improves the problems of poor high temperature resistance of the aramid framework material, poor adhesive property of the aramid framework material and rubber and the like in the prior art, and has the advantages of improving the high temperature resistance of the aramid framework material, improving the adhesive strength of the aramid framework material and rubber and the like.)

1. The production method of the aramid fiber high-temperature-resistant framework material is characterized by comprising the following preparation steps of:

the method comprises the following steps: obtaining an aramid fabric, and feeding aramid fibers into a knitting machine for knitting to obtain the aramid fabric;

step two: preparing a steeping liquor, wherein the steeping liquor comprises raw materials of resorcinol, furfural, deionized water, caustic soda, carboxyl ethylene propylene latex and ammonia water, and the specific preparation steps of the steeping liquor comprise:

firstly, adding the m-diphenol and the furfural into the deionized water to prepare a phenolic resin solution, wherein the solid content of the phenolic resin solution is 6-8.5%;

sequentially adding the caustic soda, the carboxyl ethylene propylene latex and the ammonia water into the phenolic resin solution to prepare a mixed solution;

finally, placing the mixed solution for 7-9 hours to prepare the impregnation solution;

the carboxyl ethylene-propylene latex comprises raw materials of unsaturated carboxylic acid, unsaturated carboxylic ester, an emulsifier, an initiator, electrolyte, ethylene, propylene, deionized water and a PH buffering agent;

step three: pretreating the aramid fiber fabric to remove impurities attached to the surface of the aramid fiber fabric;

step four: dipping, namely dipping the aramid fabric obtained in the step three in the dipping solution;

step five: and (4) drying at a high temperature, namely sending the aramid fabric obtained in the step four into a baking oven for drying at a high temperature to obtain the aramid high-temperature-resistant framework material.

2. The production method of the aramid fiber high-temperature-resistant framework material according to claim 1, wherein in the second step, the solid content of the resorcinol is 100%, the solid content of the furfural is 20-30%, and the solid content of the carboxyl ethylene propylene latex is 50-60%.

3. The production method of the aramid fiber high-temperature-resistant framework material as claimed in claim 1, wherein in the second step, the impregnating solution comprises the following raw materials in parts by weight:

4. the production method of the aramid fiber high-temperature-resistant framework material as claimed in claim 1, wherein in the second step, the carboxyl ethylene propylene latex comprises the following raw materials in parts by weight:

the unsaturated carboxylic acid is acrylic acid or methacrylic acid, the unsaturated carboxylic acid ester is one or more of methyl acrylate, ethyl acrylate and butyl acrylate, the initiator is potassium persulfate, ammonium persulfate or a mixture of the potassium persulfate and the ammonium persulfate, the electrolyte is one or more of potassium chloride, potassium carbonate and sodium carbonate, and the pH buffer is one or more of sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate;

the carboxyl ethylene propylene latex comprises the following specific preparation steps:

firstly, adding the unsaturated carboxylic acid, the unsaturated carboxylic ester, an emulsifier, an initiator, an electrolyte, ethylene, propylene and the deionized water into a polymerization kettle for free radical emulsion polymerization, wherein the polymerization time is 3-5 hours;

and then adding the pH buffering agent into the polymerization kettle to adjust the pH to be 6-9, and preparing the carboxyl ethylene propylene latex.

5. The production method of the aramid fiber high-temperature-resistant framework material according to claim 1, characterized in that in the third step, the pretreatment specifically comprises the following steps:

firstly, soaking the aramid fiber fabric into distilled water and shaking back and forth for 3-5 minutes;

and then taking the aramid fiber fabric out of the distilled water and placing the aramid fiber fabric in an environment with the temperature of 100-120 ℃ for drying.

6. The production method of the aramid fiber high-temperature-resistant framework material according to claim 1, wherein in the fourth step, the dipping treatment comprises the following specific steps: adding the impregnation liquid into an impregnation liquid tank, and then dragging the aramid fiber fabric to travel in the impregnation liquid through a traction mechanism, wherein the travel speed of the aramid fiber fabric is 0.2-0.4 m/s.

7. The production method of the aramid fiber high-temperature-resistant framework material according to claim 1, wherein in the fifth step, the high-temperature drying temperature is 200-220 ℃, and the high-temperature drying time is 4-6 min.

Technical Field

The invention relates to the technical field of aramid fiber framework materials, in particular to a production method of an aramid fiber high-temperature-resistant framework material.

Background

The aramid fiber fabric has high melting point and high temperature resistance, so that the aramid fiber framework material is usually used in a high-temperature working condition environment, and is prepared by taking the aramid fiber fabric as a base material, immersing the aramid fiber fabric into a steeping liquor for modification and then drying at high temperature.

The conventional latex adhesive is prepared by adding resorcinol-formaldehyde resin solution into the conventional latex adhesive, but the bonding performance can be rapidly reduced after the temperature is over 150 ℃, the separation phenomenon can occur between the aramid framework material and the rubber, and the elongation of the aramid framework material in a high-temperature environment is high, so that the compound of the aramid framework material and the rubber is easy to deform, and the use is influenced.

Aiming at the technical problems, the invention discloses a production method of an aramid fiber high-temperature-resistant framework material, which uses carboxyl ethylene-propylene latex as an adhesive, and the latex has the advantages of high bonding strength, good high-temperature resistance and the like, so that the invention has the advantages of improving the high-temperature resistance of the aramid fiber framework material, improving the bonding strength between the aramid fiber framework material and rubber and the like.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a production method of an aramid fiber high-temperature-resistant framework material, so as to solve the technical problems of poor high-temperature resistance of the aramid fiber framework material, poor bonding performance of the aramid fiber framework material and rubber and the like in the prior art.

The invention is realized by the following technical scheme: the invention discloses a production method of an aramid fiber high-temperature-resistant framework material, which comprises the following preparation steps:

the method comprises the following steps: obtaining an aramid fabric, and feeding aramid fibers into a knitting machine for knitting to obtain the aramid fabric;

step two: preparing a steeping fluid, wherein the steeping fluid comprises raw materials of resorcinol, furfural, deionized water, caustic soda, carboxyl ethylene propylene latex and ammonia water, and the specific preparation steps of the steeping fluid comprise:

firstly, adding m-diphenol and furfural into deionized water to prepare a phenolic resin solution, wherein the solid content of the phenolic resin solution is 6-8.5%;

sequentially adding caustic soda, carboxyl ethylene propylene latex and ammonia water into the phenolic resin solution to prepare a mixed solution;

finally, placing the mixed solution for 7-9 hours to prepare impregnation liquid;

the carboxyl ethylene-propylene latex comprises raw materials of unsaturated carboxylic acid, unsaturated carboxylic ester, emulsifier, initiator, electrolyte, ethylene, propylene, deionized water and PH buffer agent;

step three: pretreating aramid fiber fabric to remove impurities attached to the surface of the aramid fiber fabric;

step four: dipping treatment, namely dipping the aramid fiber fabric obtained in the step three in a dipping solution;

step five: and (4) drying at a high temperature, namely sending the aramid fabric obtained in the step four into a baking oven for drying at a high temperature to obtain the aramid high-temperature-resistant framework material.

Furthermore, in order to improve the using effect of the dipping solution, in the second step, the solid content of the resorcinol is 100%, the solid content of the furfural is 20-30%, and the solid content of the carboxyl ethylene propylene latex is 50-60%.

Further, in order to improve the use effect of the impregnation liquid, in the second step, the impregnation liquid comprises the following raw materials in parts by weight:

further, in order to improve the high temperature resistance and the adhesive property of the carboxyl ethylene-propylene latex, in the second step, the carboxyl ethylene-propylene latex comprises the following raw materials in parts by weight:

the unsaturated carboxylic acid is acrylic acid or methacrylic acid, the unsaturated carboxylic acid ester is one or more of methyl acrylate, ethyl acrylate and butyl acrylate, the initiator is potassium persulfate, ammonium persulfate or a mixture of the potassium persulfate and the ammonium persulfate, the electrolyte is one or more of potassium chloride, potassium carbonate and sodium carbonate, and the pH buffer is one or more of sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate;

the preparation method of the carboxyl ethylene propylene latex comprises the following specific steps:

firstly, adding unsaturated carboxylic acid, unsaturated carboxylic ester, an emulsifier, an initiator, electrolyte, ethylene, propylene and deionized water into a polymerization kettle for free radical emulsion polymerization, wherein the polymerization time is 3-5 hours;

and then adding a pH buffering agent into the polymerization kettle to adjust the pH to 6-9, and preparing the carboxyl ethylene propylene latex.

Further, in order to better remove impurities such as short fibers, dust and the like on the surface of the aramid fiber fabric, in the third step, the pretreatment specifically comprises the following steps:

firstly, soaking aramid fiber fabric into distilled water and shaking back and forth for 3-5 minutes;

and then taking the aramid fiber fabric out of the distilled water and placing the aramid fiber fabric in an environment with the temperature of 100-120 ℃ for drying.

Further, in order to allow the impregnation liquid to fully soak the aramid fiber fabric and improve the impregnation effect, in the fourth step, the specific steps of the impregnation treatment are as follows: and adding the impregnation liquid into an impregnation liquid tank, and then drawing the aramid fiber fabric to advance in the impregnation liquid through a traction mechanism, wherein the advancing speed of the aramid fiber fabric is 0.2-0.4 m/s.

Further, in order to improve the high-temperature drying effect, in the fifth step, the high-temperature drying temperature is 200-220 ℃, and the high-temperature drying time is 4-6 min. At lower temperatures and shorter drying times, the aramid fabric cannot be completely dried, and at higher temperatures and longer times, the aramid fabric is damaged.

The invention has the following advantages: the invention uses the ethylene-propylene-diene monomer latex as the adhesive, and the ethylene-propylene-diene monomer latex has the advantages of high bonding strength, good high temperature resistance and the like, thereby improving the high temperature resistance of the aramid fiber framework material and simultaneously improving the bonding strength of the aramid fiber framework material and rubber.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.