Reconstituted composite materials derived from waste made by solid state pulverization
A method of making polymeric composite particles from polymeric scrap material, virgin polymeric material, or mixtures thereof and glass particles by subjecting a mixture of the polymeric particles and glass particles to a solid state shear pulverization and in-situ polymer compatibilization.
1. A method for preparing reconstituted composite particles from a single bin recycling mixture comprising the steps of:
a) comminuting said single bin recycling mixture composed of a post-consumer polymeric material contaminated with post-consumer glass scraps, to form a composite mixture comprising glass and polymeric flakes having sharp and angular surfaces;
b) effecting a chemical change to said composite mixture by application of mechanical energy thereto through solid state shear pulverization in the presence of cooling sufficient to maintain said composite mixture in the solid state during said pulverization to form reconstituted composite particles; and
c) discharging said reconstituted composite particles.
2. A method for manufacturing of a powder of reconstituted composite material from a single bin recycling mixture, said method comprising the steps of:
a) comminuting said single bin recycling mixture composed of a post-consumer polymeric material contaminated with post-consumer glass scraps, to form a composite mixture including glass and polymeric flakes having sharp and angular surfaces;
b) introducing said composite mixture into a pulverization device having an inlet for said composite mixture, means for pulverizing said composite mixture to effect chemical change by means of solid state shear pulverization in the presence of cooling sufficient to maintain the composite mixture in the solid state during the pulverization, an outlet for said powder of reconstituted composite material, and means for cooling the temperature of said composite mixture between said inlet and outlet;
c) cooling said composite mixture to maintain said composite mixture in the solid state without melting within said pulverization device;
d) pulverizing said solid state composite mixture within said pulverization device to chemically alter said composite mixture; and
e) discharging said powder of reconstituted composite material from said outlet.
3. The method of claim 1 , wherein the solid state shear pulverization is effected by a co-rotating screw pulverizer.
4. The method of claim 1 , wherein said single bin recycling mixture contains 1 to 40 wt. % of said post-consumer glass scraps.
5. The method of claim 1 , wherein said post-consumer glass scraps are is pulverized to form glass particles which have less than 500 microns maximum dimension in said composite mixture.
6. The method of claim 1 , wherein the chemical change includes bond rupture.
7. The method of claim 1 , wherein said post-consumer polymeric material is a quantity of polymeric chips, said chips having a size in the range of about 0.10 to 0.30 inches maximum width dimension and about 0.02 to 0.06 thickness dimension.
8. The method of claim 1 , wherein said post-consumer polymeric material comprises two or more polymeric materials selected from the group consisting of HDPE, LDPE, LLDPE, PP, PS, PET, PVC, polycarbonate, acrylonitrile butadiene styrene, and polyphenylene oxide.
9. The method of claim 5 , wherein said glass particles have a particle size of 0.5 to 150 microns in said composite mixture.
10. The method of claim 9 , wherein said post-consumer polymeric material in said composite mixture contains polymeric chains that include silyl or siloxane constituents.
11. The method of claim 2 , wherein said solid state shear pulverization is effected by a co-rotating screw pulverizer.
12. The method of claim 2 , wherein said composite mixture contains 1 to 40 wt. % of said post-consumer glass scraps.
13. The method of claim 2 , wherein said post-consumer glass scraps are pulverized to form particles which have less than 500 microns maximum dimension in said composite mixture.
14. The method of claim 2 , wherein the chemical change includes bond rupture.
15. The method of claim 2 , wherein said post-consumer polymeric material is a quantity of polymeric chips, said chips having a size in the range of about 0.10 to 0.30 inches maximum width dimension and about 0.02 to 0.06 thickness dimension.
16. The method of claim 2 , wherein said post-consumer polymeric material comprises two or more polymeric materials selected from the group consisting of HDPE, LDPE, LLDPE, PP, PS, PET, PVC, polycarbonate, acrylonitrile butadiene styrene, and polyphenylene oxide.
17. The method of claim 13 , wherein said post-consumer glass particles have has a particle size of 0.5 to 150 microns in said composite mixture.
18. The method of claim 17 , wherein said post-consumer polymeric material contains polymeric chains that include silyl or siloxane constituents.