COMPOSITE BUILDING MATERIALS
An improved composition for use in the manufacture of building materials having improved mechanical properties, including bending strength and creep recovery. Compositions and methods are disclosed for producing a polymer composite material containing reinforcing additives/additive blend, which is useful in the manufacture of composite building materials, including decking boards, rails, posts and the like. The present composite building materials have improved flexural and impact properties over similar composite building materials known in the industry, providing a viable alternative to wood, and other composites in the building industry.
1 . A building material composition comprising:
a polymer;
peroxide;
glass fiber;
calcium carbonate;
a foaming agent; and
colorants and stabilizer antioxidants, wherein said composition is admixed, melted and extruded through a die head to form a solid building material component.
2 . The building material of claim 1 , wherein the composition comprises 50-80% wt. of the polymer, 0.5-10 wt. % of peroxide, 3-50 wt. % of glass fiber, 15-40 wt. % of calcium carbonate, and 0.04-2 wt. % of the foaming agent, colorants and stabilizer antioxidants.
3 . The building material of claim 1 , wherein the polymer comprises polyethylene.
4 . The building material of claim 1 , wherein the polymer comprises high density polyethylene.
5 . The building material of claim 1 , wherein about 67.60% of the composition comprises the polymer, about 0.84% of the composition comprises peroxide, about 7.60% of the composition comprises glass fiber, about 21.37% of the composition comprises calcium carbonate, about 0.61% of the composition comprises the foaming agent, and about 1.98% of the composition comprises the colorants and stabilizer anti-oxidants.
6 . The building material of claim 1 , wherein the composition is melt-blended and extruded directly into a desired shape, the melt-blending occurring at a temperature between about 275-475 degrees Fahrenheit.
7 . The building material of claim 1 , wherein one or more portions of the composition are admixed in separate melt-processing steps and combined together to form the composition, which is further melt-processed together to form the building material.
8 . The building material of claim 1 , wherein the composition is injected in a mold, the mold being shaped substantially similar to the desired shape of the building material.
9 . The building material of claim 1 , wherein the composition comprises a modulus of elasticity of between about 126,000-185,000 psi.
10 . The building material of claim 1 , wherein the composition comprises a creep recovery rate of at least 75%.
11 . A construction board made from an extruded composition, the extruded composition comprising:
a polymer;
calcium carbonate;
peroxide; and
glass fibers.
12 . The construction board of claim 11 , wherein the polymer comprises polyethylene.
13 . The construction board of claim 12 , wherein the polymer comprises high density polyethylene.
14 . The construction board of claim 11 , wherein the extruded composition further comprises a foaming agent, colorants, and/or stabilizer antioxidants.
15 . The construction board of claim 14 , wherein the extruded composition comprises 50-80% wt. of the polymer, 15-40 wt. % of calcium carbonate, 0.5-10 wt. % of peroxide, 3-50 wt. % of glass fibers, and 0.04-2 wt. % of the foaming agent, colorants and/or stabilizer anti-oxidants.
16 . The construction material of claim 15 , wherein 67.60% of the extruded composition comprises the polymer, 0.84% of the extruded composition comprises peroxide, 7.60% of the extruded composition comprises glass fibers, 21.37% of the extruded composition comprises calcium carbonate, 0.61% of the extruded composition comprises the foaming agent, and 1.98% of the extruded composition comprises the colorants and stabilizer anti-oxidants.
17 . The construction material of claim 14 , wherein the extruded composition comprises a modulus of elasticity of between about 126,000-185,000 psi.
18 . The construction material of claim 17 , wherein the extruded composition comprises a modulus of elasticity of about 144,025 psi.
19 . A method of forming a composite building material comprising:
providing a plurality of components to a gravimetric scale to generate a batch of a composition, the components of the batch comprising a polymer, peroxide, glass fiber, calcium carbonate, a foaming agent, and a colorants and/or stabilizer antioxidants;
providing the batch of the composition to a blending portion of the gravimetric scale and blended for a minimum of 30 seconds;
providing the blended batch of the composition into the throat of the extruder, the extruder heating, further blending, and pushing the blended batch of the composition down a barrel portion of the extruder using a rotating auger or screw, the heated and blended batch being turned into a semi-solid material and pushed out the opposite end of the extruder by the rotating screw that formed the semi-solid composite material;
pushing and/or pulling the semi-solid material through a rough shaping device or die head; and
pushing and/or pulling the semi-solid material into a cooling area, the cooling area comprising a form to simultaneously form the semi-solid composite material into a final desired shape as the cooling changes the semi-solid composite material into a solid material.