Unsaturated Polyester with Terminal Carboxylic Acid Functional Group for Use in SMC and BMC Processes

Application:

Unsaturated polyester resin has been developed for composite molding processes by bulk and sheet methods.


Certified ByTrust

Product Introduction:

In composite molding processes, two types of sheet and bulk molding products (Sheet molding compound (SMC)/Bulk molding compound (BMC)) are known for use in making parts with heat and press. The process is such that pre-impregnated fibers with resin along with initiator and accelerator and other additives are produced in the form of sheet or block. The resin used in these products are mainly epoxy, unsaturated polyester or vinyl ester. Also, the reinforcing fibers in these composites are types of glass fibers with specific length and diameter.

These products may be stored in the warehouse for several weeks or months from the time of production to the time of molding; Therefore, the main difference of this type of composites with other methods in which fibers and resin are mixed in place is that the viscosity of the resin should be such that it does not flow during storage. In addition, the low viscosity at the time of molding also causes the fiber resin to release and exit the machine under the pressure of the press. However if the viscosity of the polymer component is very high, there will be a problem of not flowing and filling the mold during molding.

Technical Specifications:

In addition to resin, other materials are used: styrene as an active solvent, fibers, a thickening agent, various fillers, additives such as dispersing and wetting agents for powders and pigments, mold release agents, shrinkage improvers, and possibly pigments. will be Fine tuning of these components is itself important in SMC/BMC fabrication. Increasing the amount of filler reduces the price and sometimes improves some properties; But on the other hand, it increases the viscosity. Although styrene can reduce viscosity; But its large amount causes fragility and loss of mechanical properties of the product. Although the design of the formulation of such products is mainly done by controlling its amounts and components, the thickening mechanism is one of the most important conditions for the production of BMC/SMC, in which the type of resin and its structure are important. The synthesis process of these resins is two-step, which is different from ordinary unsaturated polyester resins. In the first step, polyester resin with minimum acid number and hydroxyl end functional groups should be formed, and then the temperature decreases and by introducing dicarboxylic acid compounds, carboxylic acid end functional groups are formed. A variety of functional tests such as measuring the softness point, elasticity, acid number stability, etc. have been measured by the company.

Advantages:

* High scale production

* Strong quality control

* Low price compared to competitors

Company

Type

This product is a final B2B customer product.

Main Export Destinations

, , , , , , ,

Product Categories
My Cart
Categories