There are many types of Fiberglass sculpture molds, and different types have different characteristics.
1, Fiberglass sculpture plaster mold
Glass fiber reinforced plastic sculpture plaster model is heat-resistant, cheap, small thermal conductivity, and good reproducibility. Generally used to make master molds. Easy to manufacture, suitable for large products. However, it is not durable, afraid of impact, and slow to dry. Mostly used for single products and complex linear products, such as reliefs, small and medium-sized circular sculptures, etc. The gypsum used is mostly hemihydrate gypsum, that is, gypsum. Like cement molds, bricks and wood can be used as the skeleton foundation, and then covered with plaster layers. In order to improve rigidity and prevent cracks, sufficient filler can be added to gypsum, such as quartz, which can reduce shrinkage and cracks, and add cement (gypsum: cement = 7: 3) to increase strength. It has also been proposed to use gypsum to add an appropriate amount of latex and dilute it with water to make a mold, which has good strength and cannot afford powder.
2, Fiberglass sculpture rubber mold
Rubber molds are generally made of silicone rubber and polyurethane resin. They are used to make complex reliefs, round sculptures and various shapes. They are not used alone. They must be composed of other materials such as plaster molds. Or overlap a certain part that cannot be demoulded directly, because it has a certain degree of softness. When the outer mould is demoulded, it can be pulled out at will, such as lions, dragons and other animals or bodhisattva and cartoon characters. Use this method when the batch size is not large.
3, Fiberglass sculpture paraffin mold
Vermiculite wax molds are used for products with a small number or complicated linear shapes that are not easy to demold. For example, if you want to manufacture an integral elbow, including a 90 ° elbow, you can use two elbows Huff as the master mold. After the inner 90 ° cavity is filled with paraffin, remove the Huff master mold, and then place the paraffin core slightly. Add trimming, then cover the outer wall with glass fiber reinforced plastic, heat it after curing, and make the paraffin melt and flow out, then you can get a whole glass fiber reinforced plastic product.
In order to reduce shrinkage and deformation and increase stiffness, about 5% stearic acid can be added to paraffin. It is easy to manufacture, easy to demould, and paraffin can be reused. But the accuracy is not high. Another way of use: In the case of wet coiling, the steel pipe can be immersed in melted paraffin wax at 70 ～ 80 ℃, lifted and cooled, and then immersed. Repeatedly, until the required thickness, the surface is slightly trimmed to cover. Fiberglass, in order to prevent cracking of paraffin, a small amount of butter can be added to the wax. It can also be coated with a thin layer of cellophane on the outside of the wax as a mold core. After the glass fiber reinforced plastic is cured, the heated steel pipe paraffin melts to release the mold.
4. Concrete mold
Concrete molds are mostly used for products with linear rules and low re-use times, such as spiral, corrugated, circular, arched or three-dimensional grooved products. Low cost and good rigidity. Bricks can be used as a foundation, then cement mortar can be used for grinding, putting on putty, and then grinding, polishing and painting. This cement mold can be directly used to produce Fiberglass products, and it can also be used as a master mold for turning Fiberglass molds. The cement mold dries slowly. Even under normal conditions, it takes more than a week to perform surface construction such as painting.