CN105563587A

CN105563587A - Anticorrosive timber

Info

Publication number: CN105563587A
Application number: CN201510948060.0A
Authority: CN
Inventors: 邵永忠
Original assignee: CHANGSHU CITY MEILI TOWN ZHAOSHI YONGHONG REDWOOD FURNITURE FACTORY
Current assignee: CHANGSHU CITY MEILI TOWN ZHAOSHI YONGHONG REDWOOD FURNITURE FACTORY
Priority date: 2015-12-17
Filing date: 2015-12-17
Publication date: 2016-05-11

Abstract

The invention relates to an anticorrosive timber. The timber is modified mainly by acetylation, so that the timber has the intrinsic change and has the corrosion resistance. The timber is modified by the following steps: (1) drying and pretreating the timber: drying the timber until the water content is 3 to 7 percent, and pretreating the timber with vapor so as to improve the permeability of the timber; (2) performing the acetylation: adding a given amount of acetic anhydride into a reaction tank to immerse the timber, and then heating to 100 to 140 DEG C; (3) purifying the product: recycling residual acetic anhydride in the reaction tank after the acetylation, rinsing with clean water, converting the acid anhydride into acid, then discharging the acid liquid, and re-drying the timber. By utilizing the acetylation, the corrosion resistance of the timber can be improved, the hygroscopicity of the timber is remarkably reduced, the stability is good, the surface erosion caused by the atmosphere can be reduced, the color brightness can be maintained for a long time, and the mechanical properties of the timber are influenced.

Description

A kind of corrosion resistant type timber

Technical field

The present invention relates to Wooden modifying field, particularly relate to a kind of corrosion resistant type timber.

Background technology

The report that late 1920s has just had wood powder and sawdust to be acetylation, and the acetylizad research of solid wood starts from the forties.Subsequently, the U.S., Japan etc. start technical research and the application study of wood acetylation in succession.Current acetylate wood achieves commercialization.Because acetylate wood cost is higher, be mainly used in making high value added product.The first-elected application of acetylation solid wood is outdoor platform (deck), and acetyl fibre then can be used for manufacturing tapered squeezing forming polypropylene thermoplastic composite.

Wood preservation process can improve the performances such as the antibacterial insect protected of timber, is the important channel of saving timber resources, improving timber utilization rate, increasing Wood products function.Wood using life after preservative treatment is undressed 5 ~ 6 times.By 2010, if do preservative treatment to China's building, finishing and production maintenance etc. with 10% of material, then can save timber 3600 ten thousand stere every year, visible wood preservation was very large to saving timber resources, solving the potentiality of timber supply and demand contradiction.A kind of composite anti-corrosive timber for outdoor railing is now provided, well enhances corrosion resistance and the insect resistace of timber, improve service life and the cycle of timber.

Summary of the invention

The technical problem that the present invention mainly solves is to provide a kind of corrosion resistant type timber, can overcome that timber existing for prior art is perishable, the defect such as the shallow and oxidation of rough surface, colouring.

A kind of corrosion resistant type timber, having carried out modification to timber makes timber there occurs essential change, mainly through carrying out acetylation to timber: (1) drying and pretreatment, by the drying of wood to moisture content 3%-7%, use pre-steaming, to improve the permeability of timber simultaneously; (2) acetylation, adds certain acetic anhydride unrestrained bubble timber, is then heated to 100 ~ 140 DEG C in retort; (3) product purification, needs after acetylation to reclaim acetic anhydride residual in retort, uses clear water rinsing, after changing acid anhydrides into acid, gets rid of acid solution desiccated wood more subsequently.

Further, the soak time that described acetic anhydride soaks timber is 45min.

Further, described clear water rinsing times is at 2-3 time.

The invention has the beneficial effects as follows: the present invention utilizes acetylation can improve the corrosion resistance of timber, the hygroscopicity of timber is significantly reduced, there is good stability, reduce the erosion of atmospheric surface and keep bright for a long time, have impact on the mechanical property of timber.

Detailed description of the invention

Below preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.

A kind of corrosion resistant type timber, having carried out modification to timber makes timber there occurs essential change, mainly through carrying out acetylation to timber: (1) drying and pretreatment, by the drying of wood to moisture content 3%-7%, use pre-steaming, to improve the permeability of timber simultaneously; (2) acetylation, in retort, add certain acetic anhydride unrestrained bubble timber, the soak time that acetic anhydride soaks timber is 45min, is then heated to 100 ~ 140 DEG C; (3) product purification, needs after acetylation to reclaim acetic anhydride residual in retort, with clear water rinsing 2-3 time, after changing acid anhydrides into acid, and eliminating acid solution desiccated wood more subsequently.

Acetylation process is on the impact of wood property: (1) dimensional stability: the hydroxyl quantity in acetylate wood reduces, therefore the equilibrium moisture content of timber and fibre saturated point all reduce, and dimensional stability is improved; (2) biodurable: the biodurable of acetylate wood significantly improves, and with the increase of acetylate wood rate of body weight gain, its rotproofness improves further.Its reason is that the moisture content of acetylate wood is very low, and the micropore of cell membrane is blocked is not therefore vulnerable to rotten fungal attack; (3) against weather: acetylation can improve the colour stability of timber in outdoor, reduce the illumination jaundice of timber, but acetylizad smooth protected effect extends with material modified open-assembly time and declines.

The present invention utilizes acetylation can improve the corrosion resistance of timber, the hygroscopicity of timber is significantly reduced, has good stability, reduces the erosion of atmospheric surface and keeps bright for a long time, have impact on the mechanical property of timber.

The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims

1. a corrosion resistant type timber, is characterized in that, has carried out modification make timber there occurs essential change to timber, mainly through carrying out acetylation to timber: (1) drying and pretreatment, by the drying of wood to moisture content 3%-7%, use pre-steaming, to improve the permeability of timber simultaneously; (2) acetylation, adds certain acetic anhydride unrestrained bubble timber, is then heated to 100 ~ 140 DEG C in retort; (3) product purification, needs after acetylation to reclaim acetic anhydride residual in retort, uses clear water rinsing, after changing acid anhydrides into acid, gets rid of acid solution desiccated wood more subsequently.

2. a kind of corrosion resistant type timber according to claim 1, is characterized in that, the soak time that described acetic anhydride soaks timber is 45min.

3. a kind of corrosion resistant type timber according to claim 1, is characterized in that, described clear water rinsing times is at 2-3 time.