阅读说明：本技术 一种云母带用氯丁胶乳粘合剂及其制备方法 (Chloroprene latex adhesive for mica tape and preparation method thereof ) 是由 雷晓琳 高文龙 刘慧斌 靳振华 李锐 于 2021-09-07 设计创作，主要内容包括：本发明属粘合剂技术领域,为解决环氧树脂作为云母带用粘合剂存在脆性大、抗冲击性能差,限制实际应用性的问题,提供一种云母带用氯丁胶乳粘合剂及其制备方法；由氯丁胶乳、树脂、分散剂、乳化剂、蒸馏水按比例制备而成。树脂为双酚A型环氧树脂、酚醛型环氧树脂、脂环族环氧树脂中的一种或多种以任意比例混合的混合物；分散剂为聚乙烯醇、聚乙二醇中的一种或两种以任意比例混合的混合物；乳化剂为非离子乳化剂、阴离子乳化剂的一种或多种以任意比例混合的混合物。所得氯丁胶乳粘合剂,不含“三苯”及卤代烃类高毒性溶剂和高刺激性溶剂,环保低毒,气味小,易于施工使用；材料来源方便,价格低廉,易于生产。加工工艺,操作简单,性能稳定。(The invention belongs to the technical field of adhesives, and provides a chloroprene latex adhesive for mica tapes and a preparation method thereof, aiming at solving the problems that epoxy resin as an adhesive for mica tapes has high brittleness and poor impact resistance and limits practical applicability; is prepared from neoprene latex, resin, disperser, emulsifier and distilled water. The resin is a mixture of one or more of bisphenol A epoxy resin, phenolic epoxy resin and alicyclic epoxy resin mixed in any proportion; the dispersant is one or a mixture of two of polyvinyl alcohol and polyethylene glycol mixed in any proportion; the emulsifier is a mixture of one or more of nonionic emulsifier and anionic emulsifier mixed in any proportion. The obtained neoprene latex adhesive does not contain triphenyl, halogenated hydrocarbon high-toxicity solvent and high-irritation solvent, is environment-friendly, low-toxicity, small in smell and easy to construct and use; the material source is convenient, the price is low, and the production is easy. The processing technology is simple to operate and stable in performance.)

1. A chloroprene latex adhesive for mica tapes is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of neoprene latex, 4-30 parts of resin, 0.1-2 parts of dispersant, 0.25-1 part of emulsifier and 40-80 parts of distilled water; wherein: the resin is a mixture of one or more of bisphenol A epoxy resin, phenolic epoxy resin and alicyclic epoxy resin mixed in any proportion; the dispersing agent is one or a mixture of two of polyvinyl alcohol and polyethylene glycol mixed in any proportion; the emulsifier is a mixture of one or more of nonionic emulsifier, anionic emulsifier and cationic emulsifier which are mixed in any proportion.

2. The neoprene latex adhesive for mica tapes according to claim 1, wherein: the neoprene latex is a mixture of any one or more than two of anion neoprene latex, cation neoprene latex and nonionic neoprene latex mixed in any proportion.

3. The neoprene latex adhesive for mica tapes according to claim 1, wherein: the non-ionic emulsifier is OP series, SP series or TW series; the anionic emulsifier is sodium dodecyl sulfate.

4. A method for preparing the neoprene latex adhesive for mica tapes as described in claim 1, characterized in that: the method comprises the following specific steps:

(1) adding the dispersant into distilled water, and stirring for 20-35 min at the temperature of 40 ℃ at 320-360 r/min to obtain a dispersant water solution with the mass fraction of 0.25% -1%;

(2) adding a dispersant aqueous solution into the neoprene latex, and stirring at the normal temperature of 320-360 r/min for 12-17 min to obtain a mixed emulsion;

(3) adding the emulsifier into the residual distilled water, and stirring at the normal temperature of 600-800 r/min for 25-35min to obtain an emulsifier aqueous solution;

(4) and adding the emulsifier aqueous solution and the resin into the mixed emulsion, and stirring at the normal temperature of 320-360 r/min for 20-30 min to obtain the adhesive for the mica tape.

Technical Field

The invention belongs to the technical field of adhesives, and particularly relates to a neoprene latex adhesive for a mica tape and a preparation method thereof.

Background

The production process of the mica tape in China comprises the following steps: preparing a binder solution from an organic solvent and resin, and respectively shearing, gumming and hot-pressing the mica paper and a reinforcing material (usually glass fiber cloth) to prepare a finished mica tape. At present, the adhesive for the mica tape is an epoxy resin system, and bisphenol A epoxy resin is used as matrix resin for preparing the adhesive, so that the epoxy resin has the widest application range at present.

During the production process of the mica tape, the problems of powder flying, layering, fracture, infirm bonding and the like are easily caused; 70-80% of the binder used in the impregnation process is organic solvent such as toluene, acetone and the like, and the binder is discharged to the atmosphere in the pressing process, so that the raw materials are greatly wasted, and the environment is polluted. (progress in the study of mica-based composite insulating materials, Zhang Wei et al, materials guide 2015-05-25).

The binder is used as the core part of the mica tape preparation technology, and the quality of the binder determines whether the mica tape can meet the performance requirements of the application. Epoxy resins are mainly used as a main component of adhesives at present because cured products of epoxy resins have a small shrinkage ratio and good adhesion, and cured products of epoxy resins also have excellent electrical properties, mechanical properties, and the like. However, the pure epoxy resin cured material has a three-dimensional network structure, and the internal stress is large due to the large crosslinking density, so that the epoxy resin cured material has high brittleness and poor impact resistance, and the practical applicability of the epoxy resin cured material is limited (a preparation method of an adhesive for mica tapes, CN 201911317189.6).

The neoprene latex is used as an adhesive with excellent adhesion performance. The water-based CR adhesive has the advantages of high safety, difficult fire hazard occurrence, small smell, small use environment pollution, easy adjustment of viscosity and concentration, good use operability, good adhesive property, no solvent-based wire drawing problem and the like (research progress of the improvement of the performance of the water-based chloroprene rubber adhesive, Pengjun and the like, chemistry and adhesion, 2018-1-15).

Chloroprene Rubber (CR) is an elastomer generated by alpha-polymerization of chloroprene serving as a main raw material, has the characteristics of good mechanical property, stable chemical property, excellent aging resistance, good oil resistance, air tightness, adhesiveness and the like, and is widely applied to wires and cables, adhesives, flame-retardant conveyor belts, automobile accessories, coatings, corrosion-resistant linings and the like; but also has the defects of poor storage stability, sensitivity to temperature, poor cold resistance, undesirable use at low temperature and the like. To this end, blending CR with other elastic, fibrous and plastic polymers can be used to overcome these disadvantages of CR while creating new materials with certain special properties (neoprene blend modification research profile, zhao gaoyang, liudan, etc., elastomers, 2014-8-25).

The rubber molecular structure in the neoprene latex is uniform, the latex is mainly a macromolecule with a 1, 4-trans structure, the equivalent period is small, the molecular arrangement tends to be tight, the aggregation of molecules is facilitated, and a chlorine atom with larger polarity exists on a molecular chain, so that the neoprene latex has strong crystallinity, and the neoprene latex has excellent tensile strength. The chloroprene latex adhesive is not satisfactory in heat resistance, and in order to improve the heat resistance, a thermosetting resin may be used in combination with chloroprene latex (latex product technology, Tan Haishen primary knitting).

Disclosure of Invention

The invention provides a neoprene latex adhesive for mica tapes and a preparation method thereof, aiming at solving the problems that the prior epoxy resin as an adhesive for mica tapes has large brittleness and poor shock resistance and limits the practical applicability of the epoxy resin; the neoprene latex is used as the main component of the adhesive for mica tapes, and the epoxy resin is used as the auxiliary component, so that the good mechanical property and the good insulating property of the neoprene latex are utilized to improve the mechanical property and the insulating property of the conventional adhesive.

The invention is realized by the following technical scheme: a chloroprene latex adhesive for mica tapes is composed of the following raw materials in parts by weight: 100 parts of neoprene latex, 4-30 parts of resin, 0.1-2 parts of dispersant, 0.25-1 part of emulsifier and 40-80 parts of distilled water; wherein: the resin is a mixture of one or more of bisphenol A epoxy resin, phenolic epoxy resin and alicyclic epoxy resin mixed in any proportion; the dispersing agent is one or a mixture of two of polyvinyl alcohol and polyethylene glycol mixed in any proportion; the emulsifier is a mixture of one or more of nonionic emulsifier and anionic emulsifier mixed in any proportion.

In the process of latex solidification, carboxyl containing active hydrogen in the latex enables epoxy resin to open a ring, and the epoxy resin is solidified and crosslinked at normal temperature to generate a stable network structure, so that the cohesive force and the adhesive force of the latex are improved.

The neoprene latex is a mixture of any one or more than two of anion neoprene latex, cation neoprene latex and nonionic neoprene latex mixed in any proportion. It is required to contain active hydrogen chemical groups such as carboxyl, hydroxyl, aldehyde group and the like.

The non-ionic emulsifier is OP series, SP series or TW series; the anionic emulsifier is sodium dodecyl sulfate.

The method for preparing the neoprene latex adhesive for the mica tape comprises the following specific steps:

(1) adding the dispersant into distilled water, and stirring for 20-35 min at the temperature of 40 ℃ at 320-360 r/min to obtain a dispersant water solution with the mass fraction of 0.25% -1%;

(2) adding a dispersant aqueous solution into the neoprene latex, and stirring at the normal temperature of 320-360 r/min for 12-17 min to obtain a mixed emulsion;

(3) adding the emulsifier into the residual distilled water, and stirring at the normal temperature of 600-800 r/min for 25-35min to obtain an emulsifier aqueous solution;

(4) and adding the emulsifier aqueous solution and the resin into the mixed emulsion, and stirring at the normal temperature of 320-360 r/min for 20-30 min to obtain the adhesive for the mica tape.

The invention improves the mechanical property and the insulating property of the conventional adhesive by using neoprene latex as a main component of the adhesive for mica tapes and epoxy resin as an auxiliary component and utilizing the good mechanical property and the insulating property of the neoprene latex. The neoprene latex has good mechanical property and insulating property, and can well improve the mechanical property of the prior adhesive. And meanwhile, toluene is not added in the process of producing the adhesive, so that the production environment is improved.

The invention has the beneficial effects that:

the neoprene latex adhesive prepared by the invention does not contain triphenyl (benzene, toluene and xylene), halogenated hydrocarbon high-toxicity solvent and acetone, butanone and acetate high-irritation solvent which are easy to prepare toxic chemicals, and the prepared neoprene latex adhesive is environment-friendly, low in toxicity, small in smell and easy to construct and use; the material source is convenient, the price is low, and the production is easy. The processing technology is simple to operate and stable in performance.

The main component of the latex adhesive is neoprene latex, so that the mica paper has good insulating property, and the elasticity and the impact resistance of the mica paper can be enhanced.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: a chloroprene latex adhesive for mica tapes is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of neoprene latex, 128 parts of resin C, PVA-2030.05 parts, PVA-4030.05 parts and 80 parts of distilled water; the preparation method comprises the following steps:

(1) adding 0.05 part of PVA-203 and 0.05 part of PVA-403 into 10 parts of distilled water, and stirring at the rotating speed of 320-360 r/min for 20-35 min at 40 ℃ to obtain a dispersant aqueous solution;

(2) adding a dispersant aqueous solution into 100 parts of neoprene latex, and stirring at the normal temperature at the rotating speed of 320-360 r/min for 12-17 min to obtain mixed emulsion;

(3) and adding 70 parts of distilled water and 8 parts of resin C12 into the mixed emulsion, and stirring at the rotating speed of 320-360 r/min for 20-30 min at normal temperature to obtain the adhesive for the mica tape.

Example 2: a chloroprene latex adhesive for mica tapes is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of neoprene latex, 1210 parts of resin C, PVA-2030.02 parts, PVA-4030.03 parts and 70 parts of distilled water; the preparation method comprises the following steps:

(1) adding 0.02 part of PVA-203 and 0.03 part of PVA-403 into 5 parts of distilled water, and stirring at the rotating speed of 320-360 r/min for 20-35 min at 40 ℃ to obtain a dispersant aqueous solution;

(2) adding a dispersant aqueous solution into 100 parts of neoprene latex, and stirring at the normal temperature at the rotating speed of 320-360 r/min for 12-17 min to obtain mixed emulsion;

(3) adding 65 parts of distilled water and 10 parts of resin C12 into the mixed emulsion, and stirring at the rotating speed of 320-360 r/min for 20-30 min at normal temperature to obtain the adhesive for the mica tape.

Example 3: a chloroprene latex adhesive for mica tapes is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of neoprene latex, 7 parts of bisphenol A epoxy resin, PVA-2030.02 parts, PEG-2000.02 parts, OP-100.05 parts and 75 parts of distilled water; the preparation method comprises the following steps:

(1) adding 0.02 part of PVA-203 and 0.02 part of PEG-200 into 15 parts of distilled water, and stirring at the rotating speed of 320-360 r/min for 20-35 min at 40 ℃ to obtain a dispersant aqueous solution;

(2) adding a dispersant aqueous solution into 100 parts of neoprene latex, and stirring at the normal temperature at the rotating speed of 320-360 r/min for 12-17 min to obtain mixed emulsion;

(3) adding 0.05 part of OP-10 into 60 parts of distilled water, and stirring at the normal temperature at the rotating speed of 600-800 r/min for 25-35min to obtain an emulsifier aqueous solution;

(4) and adding the emulsifier aqueous solution and 7 parts of bisphenol A epoxy resin into the mixed emulsion, and stirring at the rotating speed of 320-360 r/min for 20-30 min at normal temperature to obtain the adhesive for the mica tape.

Example 4: a chloroprene latex adhesive for mica tapes is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 100 parts of neoprene latex, 7 parts of bisphenol A epoxy resin, PVA-2030.03 parts, TW-800.06 parts, OP-100.05 parts and 78 parts of distilled water; the preparation method comprises the following steps:

(1) adding 0.03 part of PVA-203 into 3 parts of distilled water, and stirring at the rotating speed of 320-360 r/min for 20-35 min at 40 ℃ to obtain a dispersant aqueous solution;

(2) adding a dispersant aqueous solution into 100 parts of neoprene latex, and stirring at the normal temperature at the rotating speed of 320-360 r/min for 12-17 min to obtain mixed emulsion;

(3) adding 0.06 part of TW-80 into 75 parts of distilled water, and stirring at the normal temperature at the rotating speed of 600-800 r/min for 25-35min to obtain an emulsifier aqueous solution;

(4) and adding the emulsifier aqueous solution and 7 parts of bisphenol A epoxy resin into the mixed emulsion, and stirring at the rotating speed of 320-360 r/min for 20-30 min at normal temperature to obtain the adhesive for the mica tape.

Comparative example: a binder for mica tapes manufactured by guangdong corporation.

The neoprene latex adhesive for mica tapes prepared in the embodiments 1 to 4 of the invention and the adhesive for mica tapes of the comparative example are used in the mica tapes for detection, and the bending strength test method comprises the following steps: the test was carried out according to GB/T9341-2008. The volume resistivity test method comprises the following steps: the test was performed according to GB/T1410-2006. The measurement results are shown in table 1.

Table 1: performance characterization comparison table

As can be seen from table 1, the adhesive prepared according to the present invention has good mechanical and insulation properties when used in mica tapes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.