# US 2018/0022887 A9 · Process for the production of press compounds (BMC) from unhardened prepreg wastes

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- Number: US 2018/0022887 A9
- Document ID: US20180022887A9
- Status: Published application
- Kind: A9
- Application number: 15/381,967
- Filed: 2016-12-16
- Published: 2018-01-25
- Earliest claimed: 2015-12-18
- Assignees: Airbus Operations GmbH
- Applicants: Airbus Operations GmbH
- Inventors: Tassilo Witte
- Web page: https://patentgrep.com/patent/US20180022887A9

## CPC

- B29C 70/00: Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29B 17/00: Recovery of plastics or other constituents of waste material containing plastics; ({volume reduction of waste plastics, e.g. by mechanical compacting or melting disposal of solid waste B09B;} chemical recovery C08J11/00)
- B29B 17/0042: {for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic}
- B29B 17/0412: {to large particles, e.g. beads, granules, flakes, slices}
- B29C 48/022: {characterised by the choice of material}
- B29C 48/288: {in solid form, e.g. powder or granules}
- B29C 48/2886: {of fillers or of fibrous materials, e.g. short-fibre reinforcements}
- B29C 48/92: Measuring, controlling or regulating
- C08J 11/04: of polymers
- C08J 11/06: without chemical reactions
- C08K 3/22: of metals
- C08K 7/06: Elements
- C08K 7/14: Glass
- B29B 17/0026: {by agglomeration or compacting}
- B29C 43/02: of articles of definite length, i.e. discrete articles {(B29C35/0227 takes precedence)}
- B29C 2948/92704: Temperature
- B29C 2948/92876: Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29K 2101/10: Thermosetting resins
- B29K 2105/08: of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K 2105/0872: {Prepregs}
- B29K 2105/246: {Uncured, e.g. green}
- B29K 2105/26: Scrap {or recycled material}
- B29K 2707/04: Carbon
- B29K 2709/08: Glass
- C08J 2300/30: Polymeric waste or recycled polymer
- C08K 2003/222: {Magnesia, i.e. magnesium oxide}
- C08K 2003/2227: {of aluminium}
- Y02W 30/62: Plastics recycling; Rubber recycling
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A process for the recycling of wastes from webs or strands made of prepreg wastes comprising a first reactive resin, having the following steps: homogenization of prepreg wastes, dispersion of fillers and/or additives in a second reactive resin, mixing of the second resin, homogenized prepreg wastes and further processing of the mixture of resin, fillers and/or additives and prepreg wastes to produce molded workpieces.

## Claims

### Claim 1

A process for the recycling of wastes from webs or strands made of at least one of carbon fibers or glass fibers (prepreg wastes) respectively comprising reactive resin A, comprising:
a) homogenizing webs or strands made of at least one of carbon fibers or glass fibers (prepreg wastes) respectively comprising a first reactive resin, where the prepreg wastes are comminuted,
b) dispersing at least one of fillers or additives in a second reactive resin,
c) mixing the second resin B, homogenized carbon fibers or glass fibers respectively comprising the first reactive resin, and optionally the at least one of fillers or additives, where the first and second reactive resins are mutually compatible or identical, and
d) further processing the mixture of resin, fillers or additives, and prepreg wastes to produce molded workpieces.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the ratio by weight of the second resin to prepreg wastes is from 2:1 to 1:5.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the ratio by weight of the entirety of the fillers or additives to prepreg wastes is from 2:1 to 1:5.

### Claim 4 (depends on 1)

The process according to claim 1, wherein the homogenization of the prepreg wastes is achieved with one of a guillotine, screw-type extruder, twin-screw extruder, injection-molding machine, dicer, portal-controlled ultrasound cutter, rotary cutter or rolling crusher.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the prepreg wastes are comminuted in a manner such that the fiber length is at most 50 mm.

### Claim 6 (depends on 1)

The process according to claim 1, wherein the fillers or additives comprise at least one of CaCO3, talc powder, aluminum hydroxide or magnesium hydroxide, MgO talc powder, silica gel, pigments or silica.

### Claim 7

The process according to any of the preceding claims, characterized in that a portion of the fillers and/or additives is added in step a).

### Claim 8 (depends on 1)

The process according to claim 1, wherein the steps a) to d) take place in their alphabetic sequence.

### Claim 9 (depends on 1)

The process according to claim 1, wherein the chronological separation between step c) and d) is at most 2 months.

### Claim 10 (depends on 1)

The process according to claim 1, wherein step c) takes place at a temperature of at most 70° C.

### Claim 11 (depends on 1)

The process according to claim 1, wherein step c) is carried out in one of a screw-type kneader, sigma kneader, wing kneader or high-speed mixer.

### Claim 12 (depends on 1)

The process according to claim 1, wherein step e) takes place in one of the hot-press process or injection-molding process.