CN114274301A - Insect-expelling density plate made of plant fiber particles and manufacturing method thereof - Google Patents

Abstract

The invention belongs to the technical field of density boards, and particularly relates to a plant fiber particle insect-expelling density board and a manufacturing method thereof. The invention synthesizes the phenolic resin coagulant by replacing phenol with enzymatic hydrolysis lignin, the coagulant has the characteristic of low formaldehyde emission which is less than 0.025mg/L and reaches the standard of no aldehyde addition.

Description

Insect-expelling density plate made of plant fiber particles and manufacturing method thereof

Technical Field

The invention belongs to the technical field of density boards, and particularly relates to a plant fiber particle insect-expelling density board and a manufacturing method thereof.

Background

The density board is called as density fiber board, and is one kind of board produced with wood fiber or other plant fiber as material and through fiber preparation, applying synthetic resin, heating and pressurizing. The density board has the advantages of uniform structure, fine material, stable performance, impact resistance and easy processing, and is widely applied to domestic furniture, decoration, musical instruments, packaging and the like. The biggest defects of the density board are that the density board is not moisture-proof, the water absorption expansion rate is too high, and the formaldehyde emission of the used chemical reagent is large.

Disclosure of Invention

The invention aims to provide a plant fiber particle insect-repellent density board and a manufacturing method thereof, and aims to solve the technical problem of large formaldehyde emission in the prior art.

In order to achieve the above object, an insect-repellent density board made of plant fiber particles according to an embodiment of the present invention includes the following raw materials: 100 parts by weight of wood fibers and 15 to 60 parts by weight of a coagulant, the coagulant comprising a compound having a structure represented by formula (1):

optionally, the coagulant comprises the following raw materials: enzymatic hydrolysis of lignin, phenol, epihalohydrin and aldehydes.

Optionally, the coagulant further comprises the following raw materials: heteropolysaccharides and polyphenol oxidase.

Optionally, the coagulant further comprises the following raw materials: magnesium oxide powder.

Optionally, the coagulant comprises the following raw materials: enzymatic lignin, phenol, epihalohydrin and cetyl trimethylammonium bromide.

Optionally, the plant fiber particle insect-repellent density board further comprises the following raw materials: 0.5-2 parts of menthol, 0.1-0.8 part of citronellol, 0.2-0.4 part of camphor essence and 0.3-1 part of rosemary.

Optionally, the wood fibers comprise carbonized wood fibers.

In order to achieve the above object, a method for manufacturing a plant fiber particle insect-repellent density board according to an embodiment of the present invention includes the steps of:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding enzymatic lignin and phenol into an alkali solution, heating to 90-100 ℃, reacting at a constant temperature under stirring to obtain phenolated lignin, adding heteropolysaccharide and polyphenol oxidase into half of phenolated lignin once under an alkaline environment to perform an activation reaction, adding a paraffin emulsion after the reaction is finished, and stirring to obtain a slurry;

2) modification of phenolated lignin: mixing the other half of the phenolated lignin prepared in the step 1) with epoxy halogen propane, and then heating for reaction to prepare epoxy modified lignin;

3) condensation reaction: adding an aldehyde compound, alkali liquor and urea into epoxy modified lignin, stirring and heating, cooling and discharging after the reaction is finished, and mixing the cooled and discharged material with the slurry prepared in the step 1) to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the stirred wood fiber, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

In order to achieve the above object, a method for manufacturing a plant fiber particle insect-repellent density board according to an embodiment of the present invention includes the steps of:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding enzymatic lignin and phenol into an alkali solution, heating to 90-100 ℃, and reacting at a constant temperature under stirring to obtain phenolated lignin;

2) modification of phenolated lignin: mixing phenolated lignin and epoxy halogen propane, and heating for reaction to obtain epoxy modified lignin;

3) preparation of a coagulant: dripping alkali liquor and cetyl trimethyl ammonium bromide into the epoxy modified lignin during heating and stirring to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the stirred wood fiber, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

The one or more technical schemes in the plant fiber particle insect-repellent density board and the manufacturing method thereof provided by the embodiment of the invention have at least one of the following technical effects:

1. according to the invention, enzymatic hydrolysis lignin reacts with heteropolysaccharide and polyphenol oxidase after phenolization modification, the prepared slurry can form deposits similar to those between plant cells with wood fibers, and the obtained plant fiber particle insect-expelling density board has the characteristics of low water absorption expansion rate and high strength.

2. The invention synthesizes the phenolic resin coagulant by replacing phenol with enzymatic hydrolysis lignin, the coagulant has the characteristic of low formaldehyde emission which is less than 0.025mg/L and reaches the standard of no aldehyde addition.

Detailed Description

The present invention will be further described with reference to the following examples, but the embodiments of the present invention are not limited thereto.

In one embodiment of the present invention, there is provided a plant fiber particle insect-repellent density board, comprising the following raw materials: 100 parts by weight of wood fibers and 15 to 60 parts by weight of a coagulant, the coagulant comprising a compound having a structure represented by formula (1):

in another embodiment of the present invention, the coagulating agent of the plant fiber particle insect-repellent density board comprises the following raw materials: enzymatic hydrolysis of lignin, phenol, epihalohydrin and aldehydes. The method takes the enzymatic hydrolysis lignin as a raw material, the enzymatic hydrolysis lignin and the phenol are subjected to phenolization reaction, and the phenolic hydroxyl group of the phenol is connected with the enzymatic hydrolysis lignin in a form of carbon-carbon bond, so that the activity of the enzymatic hydrolysis lignin is further improved. The phenol modified product is continuously subjected to epoxidation modification, the phenolic hydroxyl group of the phenol modified product and epoxy halogen propane are subjected to epoxidation reaction, so that an epoxy group is introduced, the activity of the epoxy group is improved, and finally the obtained compound with the structure shown in the formula (1) has the characteristic of high reaction activity.

Further, the coagulant also comprises the following raw materials: heteropolysaccharides and polyphenol oxidase. After the enzymatic hydrolysis lignin is modified by phenolization, the enzymatic hydrolysis lignin reacts with heteropolysaccharide and polyphenol oxidase to prepare an adhesive substance, compared with the traditional adhesive, the preparation of the adhesive substance simulates the growth forming process of lignin in the internal tissues of plants, the adhesive substance can form deposits similar to plant cells with wood fibers, the deposits are tightly combined with the wood fibers, and the dispersed fibers are connected again to form a structure just like a natural wood board, so that the physical strength and the water resistance of the density board are improved. The density board is prepared by mixing the adhesive substance and the coagulant, and the obtained plant fiber particle insect-repellent density board has the characteristics of no aldehyde, low water absorption expansion rate and high strength.

In another embodiment of the present invention, the coagulating agent of the plant fiber particle insect-repellent density board further comprises the following raw materials: a divalent metal oxide. The divalent metal oxide can shorten the curing time of the phenolic chemical modified resin. Preferably, the divalent metal oxide is magnesium oxide powder, and the magnesium ion catalyzed synthesis of the modified resin can realize rapid curing.

In another embodiment of the present invention, the coagulating agent of the plant fiber particle insect-repellent density board comprises the following raw materials: the lignin-based epoxy resin is prepared by reacting enzymatic lignin with phenol, performing hybrid epoxidation modification with epoxy halogen propane, and finally catalyzing cetyl trimethyl ammonium bromide to obtain the lignin-based epoxy resin with stable performance, no aldehyde and low toxicity.

In another embodiment of the present invention, the plant fiber particle insect-repellent density sheet of the plant fiber particle insect-repellent density sheet further comprises the following raw materials: 0.5-2 parts of menthol, 0.1-0.8 part of citronellol, 0.2-0.4 part of camphor essence and 0.3-1 part of rosemary. The addition of the above substances can further achieve the effects of expelling insects and preventing worm damage.

In another embodiment of the present invention, the wood fiber of the plant fiber particle insect-repellent density board comprises carbonized wood fiber. The carbonized wood fiber can play roles of adsorption, flame retardance and moth prevention, has lower water absorption rate and is further placed for water absorption and expansion.

The embodiment of the invention also provides a manufacturing method of the plant fiber particle insect-repellent density board, which comprises the following steps:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding enzymatic lignin and phenol into an alkali solution, heating to 90-100 ℃, reacting at a constant temperature under stirring to obtain phenolated lignin, adding heteropolysaccharide and polyphenol oxidase into half of phenolated lignin once under an alkaline environment to perform an activation reaction, adding a paraffin emulsion after the reaction is finished, and stirring to obtain a slurry;

2) modification of phenolated lignin: mixing the other half of the phenolated lignin prepared in the step 1) with epoxy halogen propane, and then heating for reaction to prepare epoxy modified lignin;

3) condensation reaction: adding an aldehyde compound, alkali liquor and urea into epoxy modified lignin, stirring and heating, cooling and discharging after the reaction is finished, and mixing the cooled and discharged material with the slurry prepared in the step 1) to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the stirred wood fiber, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

The embodiment of the present invention further provides another manufacturing method of the plant fiber particle insect-repellent density board, which includes the following steps:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding enzymatic lignin and phenol into an alkali solution, heating to 90-100 ℃, and reacting at a constant temperature under stirring to obtain phenolated lignin;

2) modification of phenolated lignin: mixing phenolated lignin and epoxy halogen propane, and heating for reaction to obtain epoxy modified lignin;

3) preparation of a coagulant: dripping alkali liquor and cetyl trimethyl ammonium bromide into the epoxy modified lignin during heating and stirring to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the stirred wood fiber, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims. The raw materials used in the examples of the present invention were all obtained commercially.

Example 1

The manufacturing method of the plant fiber particle insect-repellent density board comprises the following steps:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding 94g of enzymatic lignin and 94g of phenol into 160g of 30% sodium hydroxide solution, adding 11g of magnesium oxide powder, heating to 96 ℃, and reacting at constant temperature for 25 minutes under stirring to obtain the phenolated lignin. Adding a buffer solution (pH is 4.5) which is 5 times of the phenolated lignin into half of the phenolated lignin, adding 20g of heteropolysaccharide and 1.2g of polyphenol oxidase at one time under an alkaline environment, carrying out an activation reaction, adding a paraffin emulsion after the reaction is finished, and stirring to obtain a slurry;

2) modification of phenolated lignin: mixing the other half of the phenolated lignin prepared in the step 1) with 25g of epoxy halogen propane, and then heating for reaction to prepare epoxy modified lignin;

3) condensation reaction: adding 32.5g of aldehyde compound and 40g of 30% sodium hydroxide solution into epoxy modified lignin to obtain glue solution, adding urea solution which is 8% of the total mass of the glue solution, stirring and heating, cooling and discharging after the reaction is finished, and mixing the cooled and discharged material with the slurry prepared in the step 1) to prepare coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the wood fiber under stirring, wherein the mass ratio of the coagulant to the wood fiber is 1: 1, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

Example 2

The manufacturing method of the plant fiber particle insect-repellent density board comprises the following steps:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding 94g of enzymatic lignin and 94g of phenol into 160g of 30% sodium hydroxide solution, heating to 96 ℃, and reacting at constant temperature under stirring to obtain phenolated lignin;

2) modification of phenolated lignin: mixing phenolated lignin with 50g of epoxy halogen propane, and heating for reaction to obtain epoxy modified lignin;

3) preparation of a coagulant: dripping 50g of 30% sodium hydroxide solution and 2g of cetyl trimethyl ammonium bromide into the epoxy modified lignin while heating and stirring to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the wood fiber under stirring, wherein the mass ratio of the coagulant to the wood fiber is 3: and 10, paving the mixed wood fibers in a mold, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

Comparative example

The manufacturing method of the plant fiber particle insect-repellent density board comprises the following steps:

adding wood fiber into a mixer, stirring and dispersing, adding commercially available phenolic resin into the wood fiber under stirring, wherein the mass ratio of the phenolic resin to the wood fiber is 1: 1, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the density board.

Example 3

In this example, the 24-hour water absorption thickness expansion rate, formaldehyde emission amount, internal bond strength of the fiber board, static bending strength and elastic modulus of the density boards prepared in examples 1 and 2 and comparative example were respectively tested, and the test results are shown in table 1.

TABLE 1

Test items	Example 1	Example 2	Comparative example
				Swelling ratio in Water thickness at 24 hours (%)	15.2	19.6	29.1
Formaldehyde emission (mg/L)	0.021	/	0.2
				Internal bond Strength (MPa) of fiberboard	0.61	0.59	0.50
Static bending strength (MPa)	25.5	23.2	21.1
				Modulus of elasticity (MPa)	2450	2310	2050

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The plant fiber particle insect-repellent density board comprises the following raw materials: 100 parts by weight of wood fibers; the method is characterized by also comprising the following raw materials: 15 to 60 parts by weight of a coagulant comprising a compound having a structure represented by formula (1):

2. the plant fiber particle insect-repellent density board according to claim 1, wherein the coagulating agent comprises the following raw materials: enzymatic hydrolysis of lignin, phenol, epihalohydrin and aldehydes.

3. The plant fiber particle insect-repellent density board according to claim 2, wherein the coagulating agent further comprises the following raw materials: heteropolysaccharides and polyphenol oxidase.

4. The plant fiber particle insect-repellent density board according to claim 3, wherein the coagulating agent further comprises the following raw materials: magnesium oxide powder.

5. The plant fiber particle insect-repellent density board according to claim 1, wherein the coagulating agent comprises the following raw materials: enzymatic lignin, phenol, epihalohydrin and cetyl trimethylammonium bromide.

6. The plant fiber particle insect-repellent density board according to any one of claims 1 to 5, further comprising the following raw materials: 0.5-2 parts of menthol, 0.1-0.8 part of citronellol, 0.2-0.4 part of camphor essence and 0.3-1 part of rosemary.

7. The plant fiber particle insect-repellent density board according to any one of claims 1 to 5, wherein the wood fiber comprises carbonized wood fiber.

8. The method for manufacturing a plant fiber particle insect-repellent density board according to claim 4, comprising the steps of:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding enzymatic lignin and phenol into an alkali solution, heating to 90-100 ℃, reacting at a constant temperature under stirring to obtain phenolated lignin, adding heteropolysaccharide and polyphenol oxidase into half of phenolated lignin once under an alkaline environment to perform an activation reaction, adding a paraffin emulsion after the reaction is finished, and stirring to obtain a slurry;

2) modification of phenolated lignin: mixing the other half of the phenolated lignin prepared in the step 1) with epoxy halogen propane, and then heating for reaction to prepare epoxy modified lignin;

3) condensation reaction: adding an aldehyde compound, alkali liquor and urea into epoxy modified lignin, stirring and heating, cooling and discharging after the reaction is finished, and mixing the cooled and discharged material with the slurry prepared in the step 1) to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the stirred wood fiber, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.

9. The method for manufacturing a plant fiber particle insect-repellent density board according to claim 5, comprising the steps of:

1) and (3) phenolization of enzymatic hydrolysis lignin: adding enzymatic lignin and phenol into an alkali solution, heating to 90-100 ℃, and reacting at a constant temperature under stirring to obtain phenolated lignin;

2) modification of phenolated lignin: mixing phenolated lignin and epoxy halogen propane, and heating for reaction to obtain epoxy modified lignin;

3) preparation of a coagulant: dripping alkali liquor and cetyl trimethyl ammonium bromide into the epoxy modified lignin during heating and stirring to prepare a coagulant;

4) forming a density board: adding the wood fiber into a mixer, stirring and dispersing, adding a coagulant into the stirred wood fiber, paving the mixed wood fiber in a mould, and performing pressure cold molding to obtain the plant fiber particle insect-expelling density board.