A hybrid reinforced sheet molding compound and its preparation method
A sheet molding compound and molding compound technology, applied in the field of composite materials, can solve problems such as poor mechanical properties and complex processes, and achieve the effects of improved mechanical properties, simple preparation process, and low cost
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[0023] A method for preparing the hybrid reinforced sheet molding compound, comprising the following steps in sequence:
[0024] Step 1: First mix unsaturated resin, low shrinkage additive, accelerator, initiator, crosslinking agent and release agent in proportion, then add inorganic mineral filler, whisker and carbon fiber and mix well, then add polymerization inhibitor, accelerator Thickener to obtain a resin paste;
[0025] Step 2: Firstly, the resin paste and glass fiber are mixed and calendered to obtain a hybrid sheet, and then the sheet is crimped, packaged, marked, weighed, and put into storage for thickening to obtain a hybrid reinforced sheet molding compound.
[0026] In the second step, the thickening temperature is 35-45° C., and the thickening time is 35-45 hours.
[0027] The glass fiber is an alkali-free untwisted glass fiber with a length of 25 to 26 mm, the carbon fiber is a chopped carbon fiber with a length of 1 to 3 mm, and the whiskers are potassium tita...
Embodiment 1
[0033] A hybrid reinforced sheet molding compound, its raw material composition and weight ratio are: glass fiber 20, carbon fiber 0.6, whisker 0.5, unsaturated resin 10, low shrinkage additive 8, accelerator 0.5, initiator 0.2, crosslinking Agent 0.5, polymerization inhibitor 0.06, release agent 0.8, thickener 0.5, inorganic mineral filler 34, wherein, described glass fiber is the alkali-free untwisted glass fiber of length 25~26mm, and described carbon fiber is the length is 3mm chopped carbon fiber, the whisker is potassium titanate whisker, the unsaturated resin is o-phthalic unsaturated resin, the low-shrinkage additive is flame-retardant epoxy vinyl resin, and the accelerator is Orthophthalic pre-acceleration resin, the initiator is tert-butyl peroxybenzoate, the crosslinking agent is styrene, the polymerization inhibitor is p-benzoquinone, and the mold release agent is stearic acid, so The thickener is magnesium oxide, and the inorganic mineral filler is Shuangfei powder....
Embodiment 2
[0040] Step is with embodiment 1, and difference is:
[0041] The raw material composition and weight ratio of the sheet molding compound are: glass fiber 25, carbon fiber 1, whisker 1, unsaturated resin 15, low shrinkage additive 11, accelerator 1.5, initiator 0.35, crosslinking agent 1, Inhibitor 0.08, release agent 1.1, thickener 0.7, inorganic mineral filler 20, the carbon fiber is a chopped carbon fiber with a length of 2mm, the whisker is magnesium sulfate whisker, and the inorganic mineral filler is calcium carbonate .
[0042] In step 2, the thickening temperature is 38° C., and the thickening time is 45 hours.
[0043] The performance testing results of the sheet molding compound prepared in this embodiment are as follows:
[0044] Density 1.81g / cm 3 , tensile strength 111MPa, flexural strength 215MPa, flexural modulus 11.8GPa, impact strength 195kJ / m 2 .
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Abstract
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