Page 50 - 《橡塑技术与装备》英文版2026年1月

HINA R&P TECHNOLOGY AND EQUIPMENT

was 2%, the thermal decomposition temperature initial decomposition temperature rose from 288.1 ℃
of the coating film increased by 10℃, and the to 334.1 ℃, and the glass transition temperature (Tg)
water absorption rate decreased from 30.56% to increased from 12.6 ℃ to 90.0 ℃.
11.12%. The tensile strength first increased and then To enhance the damping performance of
decreased, reaching a maximum of 29.7 MPa, while polyurea materials, Li Cangang et al. used silane
the elongation at break continuously decreased. coupling agent A-187 as a modifier to modify 100-
1.4.2 Resin modification mesh mica powder by solution immersion method.
Resin modification is a method of incorporating The modified mica powder was then added to the
resin molecules into polyurea molecules through polyurea damping resin. The results showed that the
means such as block copolymerization and grafting. addition of silane coupling agent A-187 modified
Commonly used resins for modification include mica powder to the polyurea resin could improve
phenolic resin, epoxy resin, and silicone resin. the damping performance of the material. When the
This approach is used to improve the temperature addition level of silane coupling agent A-187 was
resistance, reaction rate, and mechanical properties 4%, the modified mica powder exhibited the highest
of polyurea elastomers. The method is simple and activation index and the largest water contact angle,
effective. Furthermore, after modification, the indicating the best modification effect. As the
internal steric hindrance of the material increases, pigment-to-base ratio increased, the tensile strength
hindering the reaction with-NCO. This can extend and elongation at break of the polyurea damping
the bonding time of the coating to a certain extent material increased, the peak value of the damping
and improve the adhesion. factor rose, and the glass transition temperature (T g )
Phenolic resin modification is commonly used shifted towards lower temperatures.
to enhance the mechanical, thermal, and electrical Silicone is a kind of material with excellent
propert ie s of ma te ria ls. Wa ng Li uyang et al . properties such as low surface energy and low elastic
prepared phenolic resin-modified polyurethane/ modulus, and it also has good thermal stability and
polyurea coatings and found that when the phenolic oxidation resistance.
resin content in the R component of the material Liu Junren and his team modified aspartic
was around 50%, the tensile strength of the coating pol yure a using doubl e -e nde d e poxy-ba se d
film increased from 8.9 MPa to 13.2 MPa, and the polysiloxane (PDMS). Through a ring-opening
resistance to strong acids and damping properties reaction between D200 and the terminal epoxy
were improved, with Tg increasing from 12 ℃ to 106 group, PDMS was grafted onto the main chain,
℃. Epoxy resin has excellent physical, mechanical, followed by a Michael addition reaction with diethyl
a nd e l e c t ri c a l i nsul a t i on pr op e rt i e s, a nd t he maleate, resulting in the synthesis of silicone-
epoxy molecular chains can be well dispersed and modified polyaspartic ester (PAE-S). PAE-S
interpenetrated into the polyurea molecular chains to was then polymerized with HMDI prepolymer at
form a cross-linked network. room temperature to produce silicone-modified
Liu Fangfang et al. modified polyurea using polyaspartic ester polyurea. Evaluation revealed
self-made epoxy resin and found that various that the high-temperature resistance of the silicone-
properties were improved to some extent after modified polyurea was improved to varying
modification. When the self-made epoxy resin degrees. Furthermore, the polyurea exhibited the
completely replaced 1000D and D2000 in the R highest elongation at break when the hard segment
component, the tensile strength of the resulting content was 12.8%, while also demonstrating good
coating increased from 4.55 MPa to 16.63 MPa, the flexibility.

·4· Vol.52，No.1