阅读说明：本技术 一种浅色户外用重组竹材的制造方法 (Manufacturing method of light-colored outdoor recombined bamboo wood ) 是由 周喆喆 张晓春 宋剑刚 张玉卉 于 2019-08-15 设计创作，主要内容包括：本发明公开了一种浅色户外用重组竹材的制造方法,通过将竹片软化、碾压、梳解后制成竹纤维束,于改性酚醛树脂胶黏剂中浸渍施胶,将施胶的竹纤维束均匀的铺装成板坯后,送入热压机热压成型,通过将竹片软化液设置为多步骤实施的软化液,减少以往酸液或者碱液的浸泡软化时间,通过冰醋酸、二环己基碳二亚胺、马来酸酐协同发生酰化反应,其一方面能够快速的分解糖类、淀粉、蛋白质,减少对纤维素微观结构上的破坏和减少木素的分子键的断裂,其反应过程温和,并不会加深纤维束的颜色,减少了漂洗的过程,将酚醛树脂胶黏剂进行改性处理,来增加竹纤维束与酚醛树脂的粘结性能,并通过添加填料来增加组合板的整体力学性能。(The invention discloses a manufacturing method of light-colored outdoor recombined bamboo, which comprises the steps of softening, rolling and carding bamboo chips to prepare bamboo fiber bundles, dipping and gluing the bamboo fiber bundles in a modified phenolic resin adhesive, uniformly paving the glued bamboo fiber bundles to form a plate blank, sending the plate blank into a hot press for hot press molding, setting the bamboo chip softening liquid as softening liquid implemented in multiple steps, reducing the soaking and softening time of the conventional acid liquor or alkali liquor, and carrying out acylation reaction by the synergy of glacial acetic acid, dicyclohexylcarbodiimide and maleic anhydride, wherein on one hand, the bamboo chip softening liquid can rapidly decompose saccharides, starch and protein, reduce the damage on a cellulose microstructure and the breakage of molecular bonds of lignin, has mild reaction process, can not deepen the color of the fiber bundles, reduces the rinsing process, and improves the bonding performance of the bamboo fiber bundles and the phenolic resin by carrying out modification treatment on a phenolic resin adhesive, and the overall mechanical properties of the composite board are increased by adding the filler.)

1. A manufacturing method of light-colored outdoor recombined bamboo wood is characterized by comprising the following steps,

(1) unit preparation: bamboo chips are used as raw materials, and bamboo fiber bundles are prepared after softening, rolling and carding;

(2) drying and gumming: drying the bamboo fiber bundles, and then placing the dried bamboo fiber bundles into modified phenolic resin for dipping and sizing;

(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then sending the plate blank into a hot press for hot press molding;

(4) sawing: and (3) cutting edges and sanding the plate blank subjected to hot press molding, and then sending the plate blank into a constant-temperature constant-humidity room for health preservation to obtain the light-color outdoor recombined bamboo wood.

Wherein the softening in the step (1) comprises placing bamboo chips in softening liquid, softening to obtain softened bamboo chips, carding the bamboo chips treated by the solution in a rolling machine into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by a hammer with a buffer effect, and washing to obtain bamboo fiber bundles,

the softening liquid comprises a first step softening liquid, a second step softening liquid and a third step softening liquid,

the first step softening liquid comprises glacial acetic acid, maleic anhydride and dicyclohexylcarbodiimide;

the softening liquid in the second step comprises one or a mixture of at least two of mucilaginous enzyme, hemicellulase and pectinase, and also comprises vitamin C;

the softening liquid in the third step comprises alkaline water and vegetable oil.

2. The method as claimed in claim 1, wherein the step (2) of drying the bamboo fiber bundle at 100-105 ℃ until the moisture content is 6-12%,

1) dipping the modified phenolic resin glue with 20 to 25 percent of solid content for 5 to 10min, and drying the glue at 80 ℃ until the water content is less than or equal to 16 percent;

2) modified phenolic resin powder is adopted, and glue is sprayed by a spray gun according to the addition amount of 10% -20% of the glue application amount.

3. The method for manufacturing the light-colored outdoor reconstituted bamboo wood as claimed in claim 2, wherein in the step (3), after the bamboo fiber bundles are uniformly assembled, the hot pressing unit pressure is 0.4-0.8Mpa, the hot pressing temperature is 140-180 ℃, and the hot pressing time is 1-1.5min/mm according to the thickness of a finished product plate.

4. The manufacturing method of the light-colored outdoor reconstituted bamboo wood according to claim 3, wherein in the step (4), the plate blank is cut to be edged, sanded and then sent into a constant-temperature and constant-humidity room for health preservation, and the equilibrium moisture content of the constant-temperature and constant-humidity room is set according to that the annual average equilibrium moisture content of the use region of the light-colored outdoor reconstituted bamboo wood is 2% lower.

5. The method of manufacturing a light-colored outdoor reconstituted bamboo material according to claim 1,

in the step (1), the bamboo chips are firstly placed into glacial acetic acid for soaking, the bamboo chips are soaked for 5 to 20min at the temperature of between 70 and 85 ℃ for primary acylation treatment, the glacial acetic acid solution is removed, the temperature is reduced to between 45 and 65 ℃, the bamboo chips are added into the mixed solution of maleic anhydride and dicyclohexylcarbodiimide for soaking for 5 to 20min for secondary acylation treatment,

placing the above two-stage acylation processed bamboo chips into 0.5-0.7% of the softening solution of the second step, simultaneously adding 0.5% of vitamin C, performing enzymolysis for 20min,

adding vegetable oil into alkaline water for emulsification, and soaking the bamboo chips subjected to enzymolysis treatment in the emulsified vegetable oil for 20-30 min.

6. The method for manufacturing the light-colored outdoor recombined bamboo wood as claimed in claim 1, 2, 3,4 or 5, wherein the modified phenolic resin is prepared from the following raw materials in parts by weight:

2-5 parts of sweetgum resin

6-8 parts of nano rare earth oxide

100-200 parts of phenolic resin

3-5 parts of silane coupling agent

20-50 parts of a filler;

the above raw materials are stirred and reacted for 2-4 hours at 135-165 ℃.

7. The method as claimed in claim 6, wherein the nano rare earth oxide comprises one or a mixture of at least two of lanthanum oxide, neodymium oxide and zirconium oxide.

8. The method of claim 6, wherein the silane coupling agent comprises one or a mixture of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane, and γ -aminoethylaminopropyltrimethoxysilane.

9. The method for manufacturing the light-colored outdoor reconstituted bamboo wood according to claim 6, wherein the filler comprises the following components in a mass ratio of 2: 1 oyster powder and glass beads.

Technical Field

The invention relates to the technical field of agricultural and sideline product manufacturing and application, in particular to a manufacturing method of light-colored outdoor recombined bamboo wood.

Background

China is a big bamboo resource country, and bamboos are applied to the field of composite boards, so that the utilization rate of the bamboos is improved on one hand, and the composite boards with excellent performance are provided on the other hand. The bamboo-wood fiber board is a high-tech green environment-friendly novel decorative material which is mainly prepared by taking wood cellulose and plant cellulose as basic materials, thermoplastic high polymer material plastic, processing aids and the like, uniformly mixing and then heating and extruding through die equipment for molding, has the performance and characteristics of wood and plastic, and is a novel composite material capable of replacing wood and plastic. The cold-resistant and heat-insulating floor not only has the characteristics of attractive appearance and elegant appearance, but also has good cold-resistant and heat-insulating properties, and is widely applied to home decoration.

The existing bamboo wood recombined plate has the defects that some composite plates formed by mutually bonding and injection molding bamboo powder and viscose lose the original wood form of bamboo, other recombined plates formed by extracting bamboo fiber bundles from bamboo chips, paving, gluing and bonding the bamboo fiber bundles, the internal structure of the bamboo fiber bundles can be damaged in the process of extracting bamboo fibers from the bamboo chips, so that the strength of the bamboo fiber bundles is integrally reduced, in addition, the bamboo fiber bundles are required to be softened in the process of extracting fibers from the bamboo chips, the color of the bamboo fibers can be greatly deepened in the softening process by the existing technology, the light-colored bamboo fiber bundles can be prepared by further rinsing, on one hand, the color generated in the softening process is removed by rinsing, the strength of the bamboo fibers can be further damaged, the working procedures are increased, the environment is further polluted, and the existing recombined plates have poor bonding capability with the bamboo fiber bundles and the viscose, a large amount of adhesive is required to cover the bamboo fiber bundles for gluing.

Disclosure of Invention

The invention aims to provide a manufacturing method of light-colored outdoor recombined bamboo wood, which ensures that a light-colored recombined bamboo board is prepared on the premise of ensuring the strength of the recombined bamboo board and reducing bleaching steps.

The technical purpose of the invention is realized by the following technical scheme: a manufacturing method of light-colored outdoor recombined bamboo wood comprises the following steps,

(1) unit preparation: bamboo chips are used as raw materials, and bamboo fiber bundles are prepared after softening, rolling and carding;

(2) drying and gumming: drying the bamboo fiber bundles, and then placing the dried bamboo fiber bundles into modified phenolic resin for dipping and sizing;

(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then sending the plate blank into a hot press for hot press molding;

(4) sawing: and (3) cutting edges and sanding the plate blank subjected to hot press molding, and then sending the plate blank into a constant-temperature constant-humidity room for health preservation to obtain the light-color outdoor recombined bamboo wood.

Wherein the softening in the step (1) comprises placing bamboo chips in softening liquid, softening to obtain softened bamboo chips, carding the bamboo chips treated by the solution in a rolling machine into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by a hammer with a buffer effect, and washing to obtain bamboo fiber bundles,

the softening liquid comprises a first step softening liquid, a second step softening liquid and a third step softening liquid,

the first step softening liquid comprises glacial acetic acid, maleic anhydride and dicyclohexylcarbodiimide;

the softening liquid in the second step comprises one or a mixture of at least two of mucilaginous enzyme, hemicellulase and pectinase, and also comprises vitamin C;

the softening liquid in the third step comprises alkaline water and vegetable oil.

As a further improvement of the invention, after the bamboo fiber bundle is dried at 100-105 ℃ in the step (2) until the water content is 6-12 percent,

1) dipping the modified phenolic resin glue with 20 to 25 percent of solid content for 5 to 10min, and drying the glue at 80 ℃ until the water content is less than or equal to 16 percent;

2) thermoplastic powder phenolic resin is adopted, and glue is sprayed by a spray gun according to the addition amount of 10-20% of the glue application amount.

The invention is further improved, wherein in the step (3), after the bamboo fiber bundles are uniformly assembled, the hot pressing unit pressure is 0.4-0.8Mpa, the hot pressing temperature is 140-180 ℃, and the hot pressing time is 1-1.5min/mm according to the thickness of a finished product plate.

The invention is further improved, wherein in the step (4), the plate blank is cut and sanded and then sent into a constant-temperature and constant-humidity room for health preservation, and the equilibrium moisture content of the constant-temperature and constant-humidity room is set according to that the annual average equilibrium moisture content of the light-color outdoor recombined bamboo use region is 2% lower.

As a further improvement of the invention, in the step (1), the bamboo chips are firstly placed in glacial acetic acid for soaking, the first-stage acylation treatment is carried out after the soaking is carried out for 5 to 20min at the temperature of between 70 and 85 ℃, the glacial acetic acid solution is removed, the temperature is reduced to between 45 and 65 ℃, the mixture of maleic anhydride and dicyclohexylcarbodiimide is added for soaking for 5 to 20min, the second-stage acylation treatment is carried out, the bamboo chips subjected to the second-stage acylation treatment are placed in 0.5 to 0.7 percent of the softening liquid of the second step, 0.5 percent of vitamin C is simultaneously added for enzymolysis for 20min,

adding vegetable oil into alkaline water for emulsification, and soaking the bamboo chips subjected to enzymolysis treatment in the emulsified vegetable oil for 20-30 min.

As a further improvement of the invention, the modified phenolic resin adhesive is composed of the following raw materials in parts by weight:

2-5 parts of sweetgum resin

6-8 parts of nano rare earth oxide

100-200 parts of phenolic resin

3-5 parts of silane coupling agent

20-50 parts of a filler;

the above raw materials are stirred and reacted for 2-4 hours at 135-165 ℃.

As a further improvement of the invention, the nano rare earth oxide comprises one or a mixture of at least two of lanthanum oxide, neodymium oxide and zirconium oxide.

As a further improvement of the invention, the silane coupling agent comprises one or a mixture of at least two of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane.

As a further improvement of the invention, the filler comprises, in a mass ratio of 2: 1 oyster powder and glass beads.

In conclusion, the invention has the following beneficial effects:

the bamboo chip softening liquid is improved and is set to be the softening liquid implemented in multiple steps, so that the soaking softening time of the traditional acid liquid or alkali liquid is reduced, the bamboo chips are acylated by glacial acetic acid, part of protein, hemicellulose and polysaccharide in the bamboo chips are rapidly degraded and softened, the residual glacial acetic acid is used as a catalyst, and after dicyclohexylcarbodiimide is added, the residual glacial acetic acid and maleic anhydride are subjected to an acylation reaction in a synergistic manner, so that on one hand, saccharides, starch and proteins can be rapidly decomposed, the damage to the microstructure of cellulose is reduced, the breakage of molecular bonds of lignin is reduced, and the adhesive property to phenolic resin is improved under the action of anhydride; carry out the secondary treatment through compound enzymatic hydrolysate, through the softening expansion of one-level softening treatment bamboo chip, make inside compound enzymatic hydrolysate can be quick enters into the bamboo chip, enzymolysis remaining partial saccharide, starch, protein, its process is mild, it is little to the intensity destruction of cellulose, and through adding vitamin C, play the effect of keeping the look, reduce the pigment deposit that the oxidation caused, add the plant at last and have and alkali lye, after the emulsification, carry out saponification to the bamboo chip, its reaction process is mild, the environmental protection, it is little to pollute.

Through the softening process of multistep setting to reduce the acylation softening treatment's under high temperature time, reduce the destruction degree to the cellulose, with decompose remaining saccharide, starch, protein through compound enzyme, its whole process is mild, can be quick when having guaranteed bamboo fiber bundle's intensity soften, and to a great extent has kept bamboo fiber's true qualities, has reduced the process of rinsing.

The phenolic resin adhesive is modified, the liquidambar formosana is added to the phenolic resin for chain extension reaction to form a block copolymer, a net structure can be generated through crosslinking, the adhesive force of the block copolymer is improved, the adhesive property of the bamboo fiber bundle and the phenolic resin is improved by adding the nano rare earth oxide, and the overall mechanical property of the combined board is improved by adding the filler.

Detailed Description

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.