CN-121975483-A - High-temperature-resistant hydrolysis-resistant polyurethane pouring sealant and preparation method thereof

Abstract

The invention belongs to the technical field of polyurethane pouring sealants, and particularly relates to a high-temperature-resistant hydrolysis-resistant polyurethane pouring sealant and a preparation method thereof. The high-temperature-resistant hydrolysis-resistant polyurethane pouring sealant is prepared from a component A and a component B, wherein the component A comprises amine ether polyol, modified castor oil, a flame retardant and a catalyst, and the component B comprises polymeric MDI (diphenyl-methane-diisocyanate), MDI-50 and carbodiimide modified MDI. The invention provides a high-temperature-resistant hydrolysis-resistant polyurethane pouring sealant which has good process operation performance, and the prepared product also has excellent high-temperature resistance and hydrolysis resistance, and also has good mechanical property and electrical insulation property under the conditions of high temperature and hydrolysis for a long time.

Inventors

• REN MINGYUE
• LI YINGQIAN
• SONG SHUZHENG
• HAN SHENGKUI
• FANG QINGDONG
• LI YING
• LI CHANGDI
• FANG YUJUN

Assignees

• 山东一诺威聚氨酯股份有限公司

Dates

Publication Date

20260505

Application Date

20260403

Claims (8)

1. 1. The high-temperature-resistant hydrolysis-resistant polyurethane pouring sealant is characterized by being prepared from a component A and a component B according to the mass ratio of 100 (73-102), wherein: the component A consists of the following raw materials in parts by mass: 50-90 parts of amine ether polyol; 10-50 parts of modified castor oil; 4-8 parts of flame retardant; 0.02-0.05 part of catalyst; The component B comprises the following raw materials in parts by weight: 20-100 parts of polymeric MDI; MDI-50:0-40 parts; 0-60 parts of carbodiimide modified MDI; The amine ether polyol is prepared by reacting 1-amino-2-naphthol with propylene oxide, has a functionality of 3 and has a number average molecular weight of 390-740g/mol.
2. 2. The high temperature resistant and hydrolysis resistant polyurethane pouring sealant according to claim 1, wherein the molar ratio of 1-amino-2-naphthol to propylene oxide in the amine ether polyol is 1 (4-10), and the reaction temperature is 100-125 ℃.
3. 3. The high temperature resistant hydrolysis resistant polyurethane casting glue of claim 1, wherein the modified castor oil is a40.
4. 4. The high temperature resistant hydrolysis resistant polyurethane potting adhesive of claim 1, wherein the flame retardant is bisphenol a-bis (diphenyl phosphate).
5. 5. The high temperature resistant and hydrolysis resistant polyurethane potting adhesive of claim 1, wherein the catalyst is one or more of bismuth-based catalyst, zinc-based catalyst, amine-based catalyst and tin-based catalyst.
6. 6. The high temperature resistant and hydrolysis resistant polyurethane pouring sealant according to claim 5, wherein the bismuth catalyst is one of bismuth isooctanoate and bismuth laurate, and the zinc catalyst is one of zinc isooctanoate and zinc neodecanoate.
7. 7. The high temperature resistant and hydrolysis resistant polyurethane pouring sealant according to claim 5, wherein the amine catalyst is one of triethylene diamine and triethylamine, and the tin catalyst is one of dibutyl tin dilaurate and stannous octoate.
8. 8. A method for preparing the high temperature resistant hydrolysis resistant polyurethane pouring sealant according to any one of claims 1 to 7, which is characterized by comprising the following steps: (1) The preparation of the component A comprises the steps of adding amine ether polyol, modified castor oil and a flame retardant into a reaction kettle, heating to 90-100 ℃, vacuumizing and dehydrating for 2-3 hours, cooling to 50-70 ℃, adding a catalyst, vacuumizing and stirring uniformly to obtain the component A; (2) The preparation of the component B comprises the steps of adding polymeric MDI, MDI-50 and carbodiimide modified MDI into a reaction kettle, and uniformly stirring at 25-50 ℃ to obtain the component B; (3) And mixing the component A and the component B for reaction at 20-50 ℃ to obtain the high-temperature-resistant hydrolysis-resistant polyurethane pouring sealant.

Description

High-temperature-resistant hydrolysis-resistant polyurethane pouring sealant and preparation method thereof Technical Field The invention belongs to the technical field of polyurethane pouring sealants, and particularly relates to a high-temperature-resistant hydrolysis-resistant polyurethane pouring sealant and a preparation method thereof. Background Polyurethane pouring sealant is used as a high-performance packaging material with high strength of epoxy resin and high toughness of silicone rubber, and is widely applied to the fields of new energy automobile power batteries, electronic appliances, power modules and the like. The adhesive has the advantages of good adhesion, excellent impact resistance and moderate elastic modulus, and can effectively protect sensitive components and parts, and greatly improve the service stability and service life of electronic components. In practical application, the polyurethane pouring sealant needs to have lower material viscosity and longer operation time so as to ensure that the gaps inside the complex structure are fully filled. However, due to the structural characteristics and process limitations of most electronic or battery products, a heating curing process is not adopted, and in order to prolong an operation window and meet the construction rhythm of a production line, the addition amount of a catalyst is generally required to be reduced, and the operation is in temporary compliance with the construction requirement, but the cross-linking reaction at room temperature is directly caused to be difficult to sufficiently carry out, even if 7 days are taken as a curing standard, the problem of incomplete cross-linking of a molecular network of a sizing material still exists, so that the compactness of the material is finally reduced, and the dimensional stability and long-term use reliability of the material are weakened. In addition, although mechanical properties such as stretching and bonding of the cured pouring sealant at normal temperature basically reach the standard, a network structure which is not fully cured has a large number of unreacted active groups, hydrolysis reaction is very easy to occur after the pouring sealant contacts water vapor, the hydrolysis resistance of the product is obviously weakened, and the problems of glue layer cracking, debonding, performance attenuation and the like are caused. Meanwhile, with the rapid development of new energy and electronic industry, the application scene of the product is continuously expanded, the requirements on reliability are continuously improved, and devices such as power batteries, vehicle-mounted electronics and industrial power supplies are required to be in service for a long time in severe environments with high temperature, high humidity and alternating heat and cold, so that the conventional polyurethane pouring sealant has serious challenges in high temperature resistance, hydrolysis resistance and performance retention rate after humid heat aging. CN119307220a discloses a hydrolysis-resistant heat-conducting polyurethane pouring sealant and a preparation method thereof, the pouring sealant is prepared from A, B two components, wherein component A comprises amine ether polyol taking MDT as an initiator, modified castor oil A4130 and other raw materials, component B is prepared by compounding polymeric MDI, MDI-50 and carbodiimide modified MDI, the amine ether polyol taking MDT as the initiator has self-catalytic activity and steric retarding characteristics, and the pouring sealant is matched with a high-crosslinking-degree raw material system, so that the product has excellent hydrolysis resistance, and the tensile strength retention rate after hot water soaking exceeds 90 percent, but the pouring sealant prepared by the method has poor high-temperature resistance and is difficult to be applied to a high-temperature and high-humidity environment for a long time. CN117447958A discloses a high-temperature-resistant aging-resistant heat-conducting polyurethane structural adhesive and a preparation method thereof, wherein the raw materials comprise a component A and a component B, and the component A adopts a polyurethane composition consisting of 4,4'Amine ether polyol prepared by reacting diaminodiphenyl methane with epoxypropane, wherein the component B comprises polyester polyol and 1,5The prepolymer prepared by taking naphthalene diisocyanate, diphenylmethane diisocyanate and carbodiimide modified isocyanate as raw materials not only has good heat conduction performance, adhesion and flexibility, but also has excellent high temperature resistance and aging resistance, the polyurethane structural adhesive still has good adhesiveness and toughness under the conditions of high temperature and long-time aging, but when the polyurethane structural adhesive is prepared, a naphthalene ring structure is required to be introduced into a prepolymer component, the process is complex, the material vis