阅读说明：本技术 一种密封圈粘合剂及其制备方法和应用 (Sealing ring adhesive and preparation method and application thereof ) 是由 姜玉华 刘娜 赵聪聪 姜子凡 于 2019-05-23 设计创作，主要内容包括：本发明涉及粘合材料技术领域,提供了一种密封圈粘合剂,包括独立分装的粘合剂A、粘合剂B和多异氰酸酯；所述粘合剂A由氯丁橡胶混炼后溶于120#汽油和乙酯的混合液中制成,含大量弹性体,可室温冷固化,初粘强度较高,具备优良的耐水性、耐曲挠性、耐介质性,特别适合不同材质间的粘合；所述粘合剂B由萜烯树脂、促进剂PX、硫代乙酰胺混合溶于120#汽油和乙酯的混合液中制成,可增大弹性体的粘度、热稳定性和耐寒性,缩短固化时间。本发明将两种不同类型的粘合剂配方并用,按比例混合均匀后加入多异氰酸酯即可使用,可应用于大型风洞建设中的橡胶密封圈和水泥板的粘合,粘合牢固耐水性强,可长期抵抗高低温及应力拉扯的影响。(The invention relates to the technical field of bonding materials, and provides a sealing ring bonding agent which comprises a bonding agent A, a bonding agent B and polyisocyanate which are independently subpackaged; the adhesive A is prepared by mixing chloroprene rubber and dissolving the chloroprene rubber into a mixed solution of 120# gasoline and ethyl ester, contains a large amount of elastomers, can be cold-cured at room temperature, has high initial adhesion strength, excellent water resistance, bending resistance and medium resistance, and is particularly suitable for adhesion among different materials; the adhesive B is prepared by mixing terpene resin, accelerant PX and thioacetamide and dissolving in a mixed solution of 120# gasoline and ethyl ester, and can increase the viscosity, thermal stability and cold resistance of the elastomer and shorten the curing time. The adhesive is prepared by mixing two different types of adhesive formulas together, uniformly mixing the two types of adhesive formulas according to a proportion, adding the polyisocyanate for use, being applicable to the adhesion of rubber sealing rings and cement plates in large wind tunnel construction, being firm in adhesion and strong in water resistance, and being capable of resisting the influences of high and low temperatures and stress pulling for a long time.)

1. the sealing ring adhesive is characterized by comprising an adhesive A, an adhesive B and polyisocyanate which are independently subpackaged;

The adhesive A is prepared from the following raw materials in parts by weight:

The adhesive B is prepared from the following raw materials in parts by weight:

the mass ratio of the adhesive A to the adhesive B is 2-5: 1;

When applied, the adhesive A, the adhesive B and the polyisocyanate are mixed.

2. The seal ring adhesive according to claim 1, wherein the chloroprene rubber in the adhesive A is a mixture of chloroprene rubber CR232, chloroprene rubber M130L and chloroprene rubber A90, and the mass ratio of the chloroprene rubber CR232, the chloroprene rubber M130L and the chloroprene rubber A90 in the mixture is 50-60: 15-20: 35-45.

3. A seal ring adhesive as defined in claim 1, wherein the active agent in the adhesive a comprises one or more of zinc oxide, magnesium oxide, and lead oxide.

4. a sealing ring adhesive according to claim 1, wherein the resin in the adhesive B comprises 210 rosin modified phenolic resin and terpene resin T-100, and the mass ratio of the 210 rosin modified phenolic resin to the terpene resin T-100 is 1-2: 2-1.

5. A sealing ring adhesive according to claim 1, wherein the polyisocyanate comprises JQ-1 or JQ-6, and the ratio of the mass of the polyisocyanate to the total mass of the adhesive A and the adhesive B is 0.5-1.5: 12.

6. A method for preparing a sealing ring adhesive as claimed in any one of claims 1 to 5, comprising the steps of:

preparation of adhesive a:

mixing chloroprene rubber and an anti-aging agent D for first mixing to obtain refined rubber;

carrying out second mixing on the refined rubber and the activating agent to obtain mixed rubber;

dipping the mixed rubber into a mixed solution of 120# gasoline and ethyl ester for dissolving to obtain an adhesive A;

Preparation of adhesive B:

Mixing resin, an accelerator PX and thioacetamide, and immersing the mixture into a mixed solution of 120# gasoline and ethyl ester for dissolving to obtain an adhesive B;

When the adhesive is applied, the adhesive A, the adhesive B and polyisocyanate are mixed to obtain the sealing ring adhesive.

7. The preparation method according to claim 6, wherein the first mixing method comprises 4-6 times of eight-blade thin-pass, and the temperature of the chloroprene rubber is controlled to be less than 50 ℃ in the first mixing process.

8. the production method according to claim 6, wherein the second kneading is carried out by eight-blade thin pass 6 to 10 times, and the temperature of the second kneading is 15 to 22 ℃.

9. The preparation method of claim 6, wherein in the preparation of the adhesive A, the mixed rubber is immersed in the mixed solution of 120# gasoline and ethyl ester for dissolving for 2-5 h; in the preparation of the adhesive B, the mixture is immersed in the mixed solution of 120# gasoline and ethyl ester for dissolving for 40-55 hours.

10. Use of the sealing ring adhesive according to any one of claims 1 to 5 or the sealing ring adhesive prepared by the method according to any one of claims 6 to 9 in bonding large sealing rings for wind tunnels.

Technical Field

The invention relates to the technical field of bonding materials, in particular to a sealing ring bonding agent and a preparation method and application thereof.

background

The wind tunnel is a pipeline-shaped experimental device which is used for generating and controlling airflow in an artificial mode, simulating the flowing condition of air around an aircraft body, measuring the effect of the airflow on the aircraft and observing the physical change of the aircraft, and is one of the most common and effective tools for aerodynamic experiments. With the rapid development of aerospace technologies in China, more types of wind tunnels have been put into construction, such as hypersonic wind tunnels, low-temperature wind tunnels, heating wind tunnels and the like, and even one wind tunnel needs to meet various test requirements of high-temperature and low-temperature modulation. For example, in a large wind tunnel built in Harbin, a designed tunnel body main body framework is formed by splicing cement precast slabs, gaps between the precast slabs are sealed by sealing rings, but the use environment temperature of the sealing rings changes from-50 ℃ to 50 ℃, the environment high-temperature and low-temperature changes are large, condensed water is generated in the wind tunnel, and the requirement on the long-term sealing performance of the sealing rings is high.

due to the structural requirements of large wind tunnel main bodies, the splicing of the cement prefabricated plates can have a plurality of included angles of 8 degrees, 21 degrees, 90 degrees, 136 degrees, 158 degrees, 180 degrees and the like, so that the rubber material adopted for preparing the sealing ring is required to have good tensile resistance and processing performance, and the sealing ring can be processed into various shapes to be used for filling the included angle gaps of the cement prefabricated plates. Ethylene propylene diene monomer and chloroprene rubber are used together, and a sealing ring for a large wind tunnel is designed to meet the working state of the wind tunnel and various pulling and extruding changes of gaps of a cement board; however, how to stably bond the large-sized sealing ring for the wind tunnel and the cement prefabricated slab is a difficult problem to be solved, and the existing adhesive cannot meet the design requirements of the service life of more than 50 years under the conditions of high and low temperature change, external force pulling and corrosion of condensed water.

Disclosure of Invention

in view of the above, the invention aims to provide a sealing ring adhesive and a preparation method and application thereof, the sealing ring adhesive provided by the invention has extremely strong adhesive property, can be used for adhesion between two different materials, namely a rubber sealing ring and a cement plate, and has the advantages of high peel strength and strong water resistance of a formed adhesive layer, excellent mechanical property and weather resistance of the adhesive layer, and meets the design requirements of wind tunnel construction.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a sealing ring adhesive, which comprises an adhesive A, an adhesive B and polyisocyanate which are independently subpackaged;

The adhesive A is prepared from the following raw materials in parts by weight:

the adhesive B is prepared from the following raw materials in parts by weight:

The mass ratio of the adhesive A to the adhesive B is 2-5: 1;

when applied, the adhesive A, the adhesive B and the polyisocyanate are mixed.

preferably, the chloroprene rubber in the adhesive A is a mixture of chloroprene rubber CR232, chloroprene rubber M130L and chloroprene rubber A90, and the mass ratio of the chloroprene rubber CR232 to the chloroprene rubber M130L to the chloroprene rubber A90 in the mixture is 50-60: 15-20: 35-45.

Preferably, the active agent in the adhesive a comprises one or more of zinc oxide, magnesium oxide and lead oxide.

preferably, the resin in the adhesive B comprises 210 rosin modified phenolic resin and terpene resin T-100, and the mass ratio of the 210 rosin modified phenolic resin to the terpene resin T-100 is 1-2: 2-1.

preferably, the polyisocyanate comprises JQ-1 or JQ-6, and the ratio of the mass of the polyisocyanate to the total mass of the adhesive A and the adhesive B is 0.5-1.5: 12.

the invention provides a preparation method of the sealing ring adhesive in the technical scheme, which comprises the following steps:

Preparation of adhesive a:

mixing chloroprene rubber and an anti-aging agent D for first mixing to obtain refined rubber;

Carrying out second mixing on the refined rubber and the activating agent to obtain mixed rubber;

Dipping the mixed rubber into a mixed solution of 120# gasoline and ethyl ester for dissolving to obtain an adhesive A;

Preparation of adhesive B:

mixing resin, an accelerator PX and thioacetamide, and immersing the mixture into a mixed solution of 120# gasoline and ethyl ester for dissolving to obtain an adhesive B;

when the adhesive is applied, the adhesive A, the adhesive B and polyisocyanate are mixed to obtain the sealing ring adhesive.

preferably, the first mixing method comprises eight-blade thin-pass 4-6 times, and the temperature of the chloroprene rubber is controlled to be less than 50 ℃ in the first mixing process.

preferably, the second mixing method comprises eight-blade thin-pass for 6-10 times, and the temperature of the second mixing is 15-22 ℃.

Preferably, in the preparation of the adhesive A, the mixed rubber is immersed in the mixed solution of 120# gasoline and ethyl ester for dissolving for 2-5 hours; in the preparation of the adhesive B, the mixture is immersed in the mixed solution of 120# gasoline and ethyl ester for dissolving for 40-55 hours.

The invention also provides application of the sealing ring adhesive in the scheme in bonding large sealing rings for wind tunnels.

Has the advantages that:

The sealing ring adhesive provided by the invention comprises an adhesive A, an adhesive B and polyisocyanate which are independently subpackaged; the invention combines two different types of adhesive formulas, and the adhesive can be used by adding the polyisocyanate after being uniformly mixed according to the proportion, thereby being beneficial to storage and construction.

the adhesive A is prepared by mixing chloroprene rubber and dissolving the chloroprene rubber into a mixed solution of 120# gasoline and ethyl ester, has a certain elastomer, can be cold-cured at room temperature, has high initial adhesion strength, excellent water resistance, bending resistance and medium resistance, and is particularly suitable for adhesion among different materials; however, the adhesive a itself has insufficient long-term adhesive strength, poor thermal stability, and poor cold resistance.

the adhesive B is prepared by mixing and dissolving resin, an accelerant PX and thioacetamide in a mixed solution of 120# gasoline and ethyl ester, and has the advantages of increasing the viscosity of the elastomer, shortening the curing time of the elastomer, improving the thermal stability of the elastomer, improving the cold resistance of the elastomer and improving the long-term stability of the elastomer; however, the adhesive B itself does not have a certain elasticity and is poor in mechanical resistance.

the adhesive A and the adhesive B are matched with each other in the adhesion, so that the defect of single use of the two is overcome, the mechanical resistance and the weather resistance of the adhesion elastomer are improved, and the peel strength after adhesion is enhanced. The environment-friendly raw materials are used, so that the toxic and side effects and the pollution to the environment are reduced; the sealing ring adhesive provided by the invention has good high and low temperature aging resistance, mechanical resistance, water erosion resistance and low cost.

The embodiment result shows that the sealing ring adhesive prepared by the invention can not be degummed and does not crack under the action of ten thousand alternating loads in the bonding state after being cured; the peel strength is more than 3N/mm, and no crack exists after the coating is soaked in water for 48 hours; and after forced stripping, the elastomer of the adhesive layer is not damaged, and the damage only occurs in the rubber layer of the cement plate or the sealing ring.