CN112123499B

CN112123499B - Corrosion-resistant shaving board and preparation method thereof

Info

Publication number: CN112123499B
Application number: CN202011071851.7A
Authority: CN
Inventors: 时君友; 李翔宇; 徐文彪
Original assignee: Beihua University
Current assignee: Beihua University
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2023-05-09
Anticipated expiration: 2040-10-09
Also published as: CN112123499A

Abstract

The invention discloses an anti-corrosion shaving board and a preparation method thereof, wherein the raw materials comprise: wood shavings, rice hulls, epoxy, curing agents, preservatives; the preparation method comprises the steps of uniformly mixing wood shavings, preservative and crushed and sieved rice hulls, dividing into two equal parts, uniformly mixing the two equal parts with curing agent and epoxy resin respectively, uniformly mixing wood shavings mixed material mixed with the curing agent and the epoxy resin again, paving the mixture in a mould ore, and performing hot-press molding to obtain the anti-corrosion shaving board. According to the invention, rice hulls are added into raw materials, and epoxy resin is used as an adhesive of the particle board, so that the anti-corrosion particle board with the advantages of environmental protection, no toxicity, good water resistance and stable performance is provided.

Description

Corrosion-resistant shaving board and preparation method thereof

Technical Field

The invention relates to the technical field of wood processing, in particular to an anti-corrosion shaving board and a preparation method thereof.

Background

The particle board is also called a particle board, and is manufactured by cutting various branches and buds, small-diameter wood, fast-growing wood, wood dust and the like into fragments with a certain specification, drying, mixing with sizing materials, hardening agents, waterproofing agents and the like, and pressing at a certain temperature and under a certain pressure.

Because the shaving board is a wooden product, if ventilation is not timely maintained in rainy days, the shaving board is easy to deform due to air humidity, even has the conditions of mildew, spoilage and the like, so that indoor mildew smell is serious, most of the shaving board is formed by bonding shaving boards through adhesives, and after long-time moisture absorption, the warping deformation of the boards is caused due to the expansion force difference, so that the requirements of the shaving board on production and life are seriously influenced, and the market popularization and application of the shaving board are influenced.

Disclosure of Invention

In order to solve the technical problems, the invention provides an anti-corrosion shaving board and a preparation method thereof.

The anti-corrosion shaving board comprises the following raw materials in parts by mass: 70-100 parts of wood shavings, 20-35 parts of rice hulls, 5-10 parts of epoxy resin, 5-10 parts of curing agent and 3-5 parts of preservative.

Further, the curing agent is a polyamine curing agent.

Further, the polyamine curing agent is an epoxidized soybean oil modified polyamine curing agent, and the preparation method comprises the following steps: heating polyamine in a container, adding epoxidized soybean oil in inert atmosphere, and heating at constant temperature for reaction to obtain the polyamine curing agent.

Further, the mixing mole ratio of the polyamine to the epoxidized soybean oil is (4-5) to 1; the dripping temperature of the epoxidized soybean oil is 90-100 ℃, the constant temperature heating reaction temperature is 100-120 ℃, and the constant temperature heating reaction time is 4-5h.

The invention also provides a preparation method of the anti-corrosion shaving board, which comprises the following steps:

uniformly mixing wood shavings, preservative and crushed and sieved rice hulls, dividing into two equal parts, uniformly mixing the two equal parts with curing agent and epoxy resin respectively, uniformly mixing wood shavings mixed material mixed with the curing agent and the epoxy resin again, paving the wood shavings mixed material in a mould ore, and performing hot press molding to obtain the anti-corrosion shaving board.

Further, the rice hulls are crushed and sieved by a 300-mesh sieve.

Further, the shavings are dried to a moisture content of less than 5%.

Further, the hot press molding temperature is 120-180 ℃, the hot press molding time is 5-30min, and the hot press molding pressure is 5-10MPa.

Compared with the prior art, the invention has the following beneficial effects:

(1) The epoxy resin is a high molecular polymer, and is subjected to ring opening, solidification and crosslinking under the action of an active hydrogen compound to generate a net structure, and the epoxy resin is used as an adhesive component of the shaving board, and is combined with a hot press forming process, so that the shaving board can be tightly combined to the greatest extent, water molecules are prevented from entering, the prepared shaving board has excellent waterproof performance, and the occurrence probability of defects such as mildew, spoilage and the like of the shaving board is reduced. However, the curing process of the epoxy resin requires the introduction of a curing agent which has volatility and toxicity to a certain extent, thereby adversely affecting the health of a human body; according to the technical scheme, the epoxy soybean oil and the amine curing agent are subjected to nucleophilic substitution reaction to obtain the epoxy soybean oil modified polyamine curing agent, long chains in the soybean oil are introduced into amine groups, and the decomposition and volatility of the polyamine curing agent are reduced, so that the technical problems of volatility and toxicity of the amine curing agent are solved, and meanwhile, the introduced epoxy soybean oil has rich protein and amino acid structures, so that the adhesive has stronger adhesive property.

(2) The rice hulls are rich in cellulose, lignin and silicon dioxide, and the rice hulls have excellent hydrophobic performance due to the rich silicon dioxide content, so that the water absorption performance of wood shavings can be greatly reduced after the rice hulls are prepared into powder and the wood shavings are uniformly mixed; furthermore, the rice hull is crushed and then is doped into a microporous structure which is more favorable for rice hull powder to enter wood shavings, so that a condensation-like effect is formed, the contact area between the wood shavings and an adhesive is increased, the bonding strength is enhanced, moreover, the silicon dioxide component in the wood shavings doped with the rice hull acts on a protein structure introduced into the epoxy soybean oil modified polyamine curing agent, the acting force between the protein structure and wood is increased, and the bonding performance of the adhesive is further enhanced, so that an environment-friendly, nontoxic, waterproof and stable-performance anti-corrosion shaving board is provided.

Detailed Description

Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.

It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples are exemplary only.

As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.

Example 1

(1) Preparing an epoxidized soybean oil modified polyamine curing agent: 5mol of hydroxyethyl ethylenediamine is placed in a container, heated to 100 ℃ under the protection of nitrogen, and 1mol of epoxidized soybean oil (epoxy value 4.03) is slowly dropped into the container containing hydroxyethyl ethylenediamine. After the dripping is finished, the temperature is increased to 110 ℃, the reaction is ended after the continuous heat preservation is carried out for 4 hours, and the brown yellow viscous liquid is obtained.

(2) Weighing the raw materials: 100 parts of wood shavings, 35 parts of rice hulls, 10 parts of epoxy resin, 10 parts of epoxy soybean oil modified polyamine curing agent and 3 parts of preservative (pentachlorophenol);

(3) Uniformly mixing wood shavings with a water content of 4%, a preservative and rice hull powder crushed and sieved by a 300-mesh sieve, dividing into two equal parts, uniformly mixing the two parts with epoxy resin and a curing agent respectively, uniformly mixing the two parts again, paving the mixture in a mould frame, and carrying out hot press molding at 170 ℃ and 5MPa for 15min to obtain the anti-corrosion shaving board.

Example 2

The difference from example 1 is that the raw materials are weighed in step (2): 70 parts of wood shavings, 20 parts of rice hulls, 5 parts of epoxy resin, 5 parts of epoxy soybean oil modified polyamine curing agent and 3 parts of preservative (pentachlorophenol).

Example 3

The difference from example 1 is that the raw materials are weighed in step (2): 85 parts of wood shavings, 30 parts of rice hulls, 8 parts of epoxy resin, 8 parts of epoxy soybean oil modified polyamine curing agent and 5 parts of preservative (pentachlorophenol).

Example 4

The difference with example 1 is that the anti-corrosion shaving board is obtained by hot press molding for 20min at 150 ℃ and 7MPa.

Example 5

The difference with example 1 is that the anti-corrosion shaving board is obtained by hot press molding for 30min at 130 ℃ and 5 MPa.

Example 6

Meanwhile, in example 1, the difference is that hydroxyethylethylene diamine is directly used as a curing agent without modification of epoxidized soybean oil.

Example 7

The difference from example 1 is that the epoxidized soybean oil is mixed with wood shavings in the form of a raw material.

Example 8

The difference is that the rice hull is not contained in the raw material as in example 1.

Example 9

The same as in example 1 was distinguished in that rice hulls were used as raw materials without pulverization.

Example 10

The difference from example 1 is that the rice hulls are crushed and sieved with a 200 mesh sieve.

Example 11

The difference from example 1 is that the rice hulls are crushed and passed through a 100 mesh screen.

The particle boards prepared in examples 1 to 11 were tested for static bending strength, elastic modulus, internal bond strength, water absorption, and water absorption thickness expansion ratio according to GB/T17657-2013, and the results are shown in Table 1:

TABLE 1

In addition, the odor and VOC content tests of the particle boards prepared in examples 1-11 show that the odor and VOC content test results of the particle boards prepared by using the epoxidized soybean oil modified hydroxyethyl ethylenediamine as the curing agent are lower than those of the particle boards prepared by using the hydroxyethyl ethylenediamine which is not treated by the epoxidized soybean oil as the curing agent, and the fact that the epoxidized soybean oil modified hydroxyethyl ethylenediamine can be used as the curing agent can obviously reduce the volatility and toxicity of the material.

As can be clearly seen from table 1, in the technical scheme of the invention, the hot press curing temperature, pressure and time all have a certain influence on the performance of the prepared shaving board, wherein the anti-corrosion shaving board is obtained by hot press molding at 150 ℃ and 7MPa for 20min, and the quality of the anti-corrosion shaving board is best because the rising of the temperature, pressure and hot press time is beneficial to the curing of the epoxy resin and the curing agent, so that the combination between the shavings is more compact, the entry of water molecules is prevented, and the material performance is improved.

The addition of rice husk to the material can raise the waterproof performance of the shaving board material, and the further rice husk adding mode also affects the performance of the shaving board to some extent.

The modified epoxy soybean oil can further improve the waterproof performance of the material, and the epoxy soybean oil does not have the technical effect of improving the waterproof performance of the material when being added as a raw material alone.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. The anti-corrosion shaving board is characterized by comprising the following raw materials in parts by weight: 100 parts of wood shavings, 35 parts of rice hulls, 10 parts of epoxy resin, 10 parts of curing agent and 5 parts of preservative; the curing agent is a polyamine curing agent; the polyamine curing agent is an epoxidized soybean oil modified polyamine curing agent, and the preparation method comprises the following steps: heating polyamine in a container, adding epoxidized soybean oil in inert atmosphere, and heating at constant temperature for reaction to obtain the polyamine curing agent; the mixing mole ratio of the polyamine to the epoxidized soybean oil is 5:1; dripping the epoxidized soybean oil at the temperature of 100 ℃, heating the epoxidized soybean oil at the constant temperature of 110 ℃ for 4 hours;

the rice hulls are rice hull powder crushed and sieved by a 300-mesh sieve;

the preparation method of the anti-corrosion shaving board comprises the following steps:

uniformly mixing wood shavings, preservative and crushed and sieved rice hulls, dividing into two equal parts, uniformly mixing the two equal parts with curing agent and epoxy resin respectively, uniformly mixing wood shavings mixed material mixed with the curing agent and the epoxy resin again, paving the wood shavings mixed material in a mould ore, and performing hot press molding to obtain the anti-corrosion shaving board;

drying the wood shavings until the water content is lower than 5%;

the hot press forming temperature is 150 ℃, the hot press forming time is 20min, and the hot press forming pressure is 7MPa.