# US 9,751,810 B2 · Flame-retardant and corrosion-resistant fiber bamboo substrate and preparation method thereof

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- Number: US 9,751,810 B2
- Document ID: US9751810B2
- Status: Granted
- Kind: B2
- Application number: 13/985,258
- Filed: 2013-07-19
- Published: 2015-05-14
- Granted: 2017-09-05
- Earliest claimed: 2012-07-30
- Assignees: Wuxi Boda Bamboo and Wood Industrial Co., Ltd.
- Applicants: Wuxi Boda Bamboo and Wood Industrial Co., Ltd. (Cn); Guoqiang Sun
- Inventors: Guoqiang Sun
- Web page: https://patentgrep.com/patent/US9751810B2

## CPC

- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- B27K 3/02: Processes; Apparatus
- B27M 1/02: by compressing
- B27M 1/06: by burning or charring, e.g. cutting with hot wire (as surface treatment B44B {; cutting synthetic materials with heated tools B26F3/06 - B26F3/12})
- B27M 1/08: by multi-step processes
- B27N 3/18: Auxiliary operations, e.g. preheating, humidifying, cutting-off
- B27N 9/00: Arrangements for fireproofing (fireproofing materials C09K21/00)
- B32B 9/02: comprising animal or vegetable substances {, e.g. cork, bamboo, starch}
- C04B 35/83: Carbon fibres in a carbon matrix
- C09K 21/14: Macromolecular materials
- B27K 3/0278: {involving an additional treatment during or after impregnation}
- B27K 3/163: {Compounds of boron}
- B27K 3/34: Organic impregnating agents {(polymers B27K3/15)}
- B27K 5/009: {using a well-defined temperature schedule}
- B27K 2240/30: Fireproofing
- B32B 2260/021: Fibrous or filamentary layer
- B32B 2260/04: Impregnation, embedding, or binder material
- B32B 2262/065: Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- B27K: PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR (applying liquids or other fluent materials to surfaces in general B05; coating wood or similar material B44D); CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27M: WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27N: MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL (containing cementitious material B28B; shaping of substances in a plastic state B29C; fibreboards made from fibrous suspensions D21J; drying F26B17/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The invention claims a flame-retardant and corrosion-resistant fiber bamboo substrate and a preparation method thereof. The preparation method comprises the following steps of: 1) cutting raw bamboo into bamboo filaments; 2) flame-retardant treatment: soaking the bamboo filaments prepared in Step 1) in aqueous solution of a flame retardant; 3) drying: drying the flame-retardant treated bamboo filaments at 55° C. to 65° C. until the absolute water content is not more than 12%; 4) carbonized pyrolysis: feeding the dried bamboo filaments into a carbonized pyrolysis kiln, to be high-temperature treated according to a pyrolysis gradient; and, 5) sequentially gumming, post-gumming drying, pressing, curing, maintaining and splitting to obtain a bamboo substrate. The bamboo substrate has high stability, no cracks on the product surface, enhanced corrosion resistance and excellent flame retardance, and may be used in various climate conditions and environments.

## Claims

### Claim 1

A process for preparing a flame-retardant and corrosion-resistant fiber bamboo substrate, comprising the following steps of:
1) cutting raw bamboo into bamboo filaments;
2) soaking the bamboo filaments prepared in Step 1) in aqueous solution of flame retardant;
3) drying: drying the flame-retardant treated bamboo filaments at 55° C. to 65° C. until the absolute water content is less than 12%;
4) carbonized pyrolysis: feeding the dried bamboo filaments from step 3) into a carbonized pyrolysis kiln, to be high-temperature treated according to a pyrolysis gradient, the pyrolysis gradient being as follows: heating the dried bamboo filaments to 110° C. within between 120 min and 300 min and then keeping the temperature unchanged at 110° C. for 60 min, heating to 190° C. from 110° C. within 200 min, and then keeping the temperature unchanged at 190° C. for 240 min; and, the carbonized pyrolysis kiln being heated by an electric heater or a heat transfer oil heater without feeding of steam or gas into the carbonized pyrolysis kiln; and
5) sequentially gumming, post-gumming drying, pressing, curing, and splitting to obtain a bamboo substrate, the gumming process being as follows: soaking the bamboo filaments treated by carbonized pyrolysis in Step 4), without a moisturization step or a drying step between Step 4 and 5 to adjust the absolute water content of the bamboo filaments, in aqueous solution of phenolic glue, taking the bamboo filaments out and drying; and the aqueous solution of phenolic glue being prepared from phenol glue and water at the mass ratio of 1:1-1.5.

### Claim 2 (depends on 1)

The process for preparing a flame-retardant and corrosion-resistant fiber bamboo substrate according to claim 1, characterized in that the process of cutting raw bamboo into bamboo filaments in Step 1) is as follows: sawing off the raw bamboo, splitting, flattening, removing the green surface, removing the yellow surface, knot boring, combing and pressing to obtain bamboo filaments.

### Claim 3 (depends on 1)

The process for preparing a flame-retardant and corrosion-resistant fiber bamboo substrate according to claim 1, characterized in that, in Step 2), the mass concentration of the aqueous solution of flame retardant by percentage is 10% to 15%, and the flame retardant consists essentially of OHCH2HNC(NH2)NHCONH2.H2PO4 and H3BO3.