Polydiorganosiloxane compositions and methods of use thereof in forming wood-plastic composites
A technology of diorganosiloxane and wood-plastic composite materials, which is applied in the field of polydiorganosiloxane composition and its use in forming wood-plastic composite materials, and can solve problems such as air bubbles and cracks, and damage to long-term performance of products
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[0105] These examples are intended to illustrate the invention to those skilled in the art and are not to be construed as limiting the scope of the invention described in the claims. The starting materials in Table 3 were used in these examples.
[0106] Table 3 - Starting Materials
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[0108]
[0109] The vinyl polymers (PE) and maleated vinyl polymers (MAPE) in Table 3 are each commercially available from The Dow Chemical Company, Midland, Michigan, USA. In Table 3, density is measured by ASTM D792-13; I 2Values are measured by ASTM D1238-13 at 190°C under a load of 2.16 Kg; and melting temperatures are measured by DSC where the film is conditioned at 230°C for 3 minutes and then cooled to a temperature of -40°C at a rate of 10°C / min. After keeping the membrane at -40°C for 3 minutes, the membrane was heated to 200°C at a rate of 10°C / min. The polydiorganosiloxanes are each commercially available from Dow Silicones, Midland, Michigan, USA, and their visco...
reference example 1
[0110] Reference Example 1 - Procedure for preparing WPC samples
[0111] The compositions of these examples were produced using a twin screw extruder. The composition was processed in a twin-screw extruder and made into pellet form by cutting the extruded strands. The granular pellets can then be used in subsequent processes.
[0112] The starting material (a) lignocellulosic based filler is added separately from (b) vinyl polymer and (c) polydiorganosiloxane through a second feed system located at a location downstream of the extruder barrel . By mixing the solids into a blend of fully molten vinyl polymer and polydiorganosiloxane, samples with higher filler content can be produced than would be possible by feeding all materials at the same location.
[0113] Injection molding was used to prepare the test specimens. Tensile bars were prepared and tested according to ASTM D638-14. Each composition was processed under the same conditions as compounding in a twin-screw e...
no. 1 approach
[0164] In a first embodiment, a composition for making a wood-plastic composite article comprises:
[0165] 40% to 70% by weight of (a) a lignocellulose-based filler;
[0166] 29% to 59% by weight of (b) vinyl polymer;
[0167] 1% to 4% by weight has the formula (c) a polydialkylsiloxane wherein each R is an independently selected alkyl group having 1 to 18 carbon atoms, and the subscript x has a viscosity sufficient to make the polydialkylsiloxane A value of 5,000 mPa·s to 50,000 mPa·s as measured at 25°C on a Brookfield DV-III cone and plate viscometer with a #CP-52 spindle at 0.1 RPM to 50 RPM; and
[0168] 0% to 4% by weight of (d) maleated vinyl polymer;
[0169] Each is based on the combined weight of the starting materials (a), (b), (c) and (d) in the composition.
[0170] In a second embodiment, in the composition according to the first embodiment, starting material (a) said lignocellulosic-based filler comprises lignocellulosic materials derived from: wood, plant...
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Abstract
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