AU2020103010A4

AU2020103010A4 - An anti-mildew treatment method for environment-friendly bamboo materials

Info

Publication number: AU2020103010A4
Application number: AU2020103010A
Authority: AU
Inventors: Mingjie GUAN; Xinyuan Tang; Xiangjun Xu
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2020-12-24
Anticipated expiration: 2028-10-26

Abstract

The present invention discloses an anti-mildew treatment method for environment friendly bamboo materials, which comprises the steps as follows: Si. Removing the starch and other soluble nutrient from bamboo without green and yellow skins with ultrasound, while the ultrasonic frequency is 50khz-100khz, ultrasonic power is 400-800w, and ultrasonic temperature is 20-80 °C; The invention discloses an environment-friendly anti mildew treatment method for bamboo, which includes: SI. Using ultrasonic treatment to remove the starch and other soluble nutrient from bamboo without green and yellow skin, ultrasonic frequency is 50khz-100khz, ultrasonic power is 400-800w, ultrasonic temperature is 20-80 °C; S2. Preparing a combined anti-fungal agents by sodium acetate and butyl nipagin or sodium diacetate and butyl nipagin or sodium diacetate and propyl nipagin; S3. Preparing a compound paraffin emulsion with No.58 food paraffin, 2- hydroxy -1,4 naphthoquinone, Tween 60 and distilled water. The invention utilizes the thermal and mechanical effects of ultrasonic waves to destroy the starch and inclusions in the bamboo, and it combines with food-grade anti-fungal agents and food-grade paraffin. Therefore, the bamboo processed by this method can not only be applied to common daily bamboo products such as bamboo barrels, bamboo chopsticks, bamboo cutting boards, bamboo toothbrushes, and the like. It can greatly improve the dimensional stability, mechanical properties, hardness, wear resistance and hydrophobicity of bamboo material. -1/2 Ultrasonic Washing with Soaking the treatment of compound bamboo material anti-fungal agent Compound Compound ~ ~ ~paraffin wax _____ Dyn anti-fungal agent Erying emulsion Figure 1.

Description

-1/2

Ultrasonic Washing with Soaking the treatment of compound bamboo material anti-fungal agent

Compound Dyn Compound ~ ~ ~paraffin wax Erying _____

anti-fungal agent emulsion

Figure 1.

AUSTRALIA

PATENTS ACT 1990

PATENT SPECIFICATION FOR THE INVENTION ENTITLED:

An anti-mildew treatment method for environment-friendly bamboo materials

The invention is described in the following statement:-

An anti-mildew treatment method for environment-friendly bamboo materials

TECHNICAL FIELD

The invention relates to an anti-mildew treatment method for environment-friendly

bamboo materials, which belongs to the technical field of bamboo mildew-proof treatment.

BACKGROUND

Bamboo has the characteristics of fast growth, good degradability, short growth cycle,

high yield, as well as good physical and mechanical properties, which has a great

development value. The anti-mildew treatment of bamboo is a very important process in

the processing and manufacturing of bamboo daily necessities, bamboo furniture and

bamboo engineering materials. Although the existing anti-mildew treatment technology

has greatly reduced the toxicity to human body and environment, it can not be used for

common daily bamboo products such as bamboo bucket, bamboo chopsticks, bamboo

cutting board, bamboo toothbrush and so on. Therefore, it is of great significance to

develop an environment-friendly bamboo mildew-proof treatment method for daily

bamboo products and appliances.

Chinese invention patent CN 110253706A discloses the following method: firstly,

soaking the bamboo material in the mixed enzyme solution ultrasonic treatment, then

soaking the bamboo in the modified treatment solution. then bundling bamboo materials

and wrapping them with insulation coils. Connecting the steam generator and adding anti- corrosion treatment agent to treat bamboo, and finally drying bamboo. Although this method can play an anti-mildew effect to a certain extent, the bamboo material after ultrasonic treatment is not washed with water, and the broken starch and sugar are attached to the surface of bamboo after ultrasonic treatment, which makes bamboo more susceptible to mildew. Moreover, the added modified treatment solution and preservative are highly toxic, it cannot be applied to the anti-mildew treatment of bamboo for making daily bamboo products and appliances. Aiming at the problem that mildew easily occurs in the use process of the current daily bamboo products appliances, the invention provides an anti-mildew treatment method for environment-friendly bamboo materials.

SUMMARY

The present invention is based on the characteristics that the thermal and mechanical

effects of ultrasonic waves can destroy the starch and inclusions in bamboo. Combining

the food-grade anti-fungal agent and food grade paraffin wax, the bamboo material

processed by this technology can not only significantly improve its anti-fungal

performance, but also can greatly improve the dimensional stability, mechanical properties,

hardness, wear resistance and hydrophobicity of bamboo, which has significant economic

value and social benefits.

The technical solution of the invention comprises the following process steps:

Si. Soaking the bamboo material after removing its green and yellow skins in water,

and performing ultrasonic treatment for 1-2h;

S2. Washing the bamboo material after ultrasonic treatment with running water for 1-

2h;

S3. Putting the washed bamboo in the compound anti-fungal agent, and soaking it for

1-2h under normal temperature and pressure;

S4. Drying the bamboo material at 30-50°C after treated with the anti-mold agent, and

the moisture content is maintained at 8-12%;

S5. Putting the dried bamboo in the compound paraffin wax emulsion and soaking it

for 1-2h under normal temperature and pressure;

S6. Drying the paraffin-treated bamboo at 30-50°C, and keeping the moisture content

at 15-20%;

S7. Tempering the dried bamboo at 60-80°C for 0.5-1.5h, and the moisture content is

controlled at 8 - 1 2 %.

The ultrasonic treatment process is that the ultrasonic frequency is 50khz-100khz, the

ultrasonic power is 400-800w, and the ultrasonic temperature is 20-80 °C.

The compound anti-fungal agent is sodium acetate and butyl paraben or sodium

diacetate and butyl paraben or sodium diacetate and propyl paraben, and its mass ratio is

1:1-3:1. Adding a certain amount of water and stirring them at 20-50°C for 10-30min to

prepare a solution with the concentration of 0.6-1.4%.

The compound paraffin emulsion is prepared by homogenizing 20-25 of parts of

No.58 food paraffin, 1.5-2 of parts of 2- hydroxy -1,4 naphthoquinone, 2-3 parts of Tween

and 80-100 parts of distilled water at 80-100 °C for 1-2h.

The process of the invention is simple, energy-saving and environmentally friendly, and it is suitable for popularization.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is the process flow diagram of the present invention.

Figure 2 is the scanning electron microscope photograph of the bamboo plate before

and after modification in Example 1.

DESCRIPTION OF THE INVENTION

The preferred embodiment of the present invention will be described in detail below.

It should be understood that the preferred embodiments are only for illustrating the present

invention, not for limiting the protection scope of the present invention.

Example 1: the steps of the anti-mildew treatment method for environment-friendly

bamboo materials are as follows:

and performing ultrasonic treatment. The ultrasonic frequency is 50KHz, the ultrasonic

power is 400W, the ultrasonic time is 1 h and the ultrasonic temperature is 20°C.

S2. Washing the bamboo material after ultrasonic treatment with running water for

1h;

S3. Putting the washed bamboo in the compound anti-fungal agent. The compound

anti-fungal agent is composed of sodium acetate and butyl paraben with the mass ratio of

1:1. Adding a certain amount of water and stirring them for 10 minutes at 20°C to prepare

a solution with the concentration of 0.6%. Soaking them at room temperature and pressure

for 1h.

S4. Drying the bamboo material under 30°C after which is treated with the anti-mold

agent, and the moisture content is maintained at 8%;

for 1h under normal temperature and pressure. The compound paraffin emulsion is

prepared from 20 parts ofNo.58 food paraffin, 1.5 parts of 2- hydroxy -1,4 naphthoquinone,

2 parts of Tween and 80 parts of distilled water, which are mechanically stirred at 80°C for

1 h.

S6. Drying the paraffin-treated bamboo at 30°C, and keeping the moisture content at

%;

S7. Tempering the dried bamboo at 60°C for 1.5h, and the moisture content is

controlled at 12%.

Example 2: the steps of the anti-mildew treatment method for environment-friendly

bamboo materials are as follows:

and performing ultrasonic treatment. The ultrasonic frequency is 80Kz, the ultrasonic

power is 600W, the ultrasonic time is 1.5 h and the ultrasonic temperature is 40°C.

1.5h;

S3. Putting the washed bamboo in the compound anti-fungal agent. The compound

2:1. Adding a certain amount of water and stirring them for 20 minutes at 35°C to prepare

a solution with the concentration of 1.0%. Soaking them at room temperature and pressure

for 1.5h.

S4. Drying the bamboo material under 40°C after which is treated with the anti-mold

agent, and the moisture content is maintained at 10%;

for 1h under normal temperature and pressure. The compound paraffin emulsion is

prepared from 25 parts ofNo.58 food paraffin, 1.5 parts of 2- hydroxy -1,4 naphthoquinone,

2 parts of Tween and 100 parts of distilled water, which are mechanically stirred at 80°C

for 1.5 h;

S6. Drying the paraffin-treated bamboo at 40°C, and keeping the moisture content at

18%;

S7. Tempering the dried bamboo at 70°C for 1h, and the moisture content is controlled

at 10%.

Example 3: the steps of the anti-mildew treatment method for environment-friendly

bamboo materials are as follows:

Sl. Soaking the bamboo material after removing its green and yellow skins in water,

and performing ultrasonic treatment. The ultrasonic frequency is 100KHz, the ultrasonic

power is 800W, the ultrasonic time is 2 h and the ultrasonic temperature is 40°C;

2h;

S3. Putting the washed bamboo in the compound anti-fungal agent. The compound

3:1. Adding a certain amount of water and stirring them for 30 minutes at 50°C to prepare

a solution with the concentration of 1.4%. Soaking them at room temperature and pressure

for 2h;

S4. Drying the bamboo material under 50°C after which is treated with the anti-mold

agent, and the moisture content is maintained at 12%;

for 2h under normal temperature and pressure. The compound paraffin emulsion is

2 parts of Tween and 80 parts of distilled water, which are mechanically stirred at 100°C

for 2 h;

S6. Drying the paraffin-treated bamboo at 50°C, and keeping the moisture content at

%;

S7. Tempering the dried bamboo at 80°C for 0.5h, and the moisture content is

controlled at 8%.

Testing the bamboo material obtained by the treatment of Examples 1-3 for its

antibacterial properties (Aspergillus niger, Trichoderma viride, Penicillium citrinum)

according to GB/T 18261-2013. Performing hardness test according to GB/T 1941-2009.

According to ASTM D1037, testing the axial and radial water absorption expansion rates, and the test results are shown in Table 1:

Table 1

Control effectiveness/% Water Hardness/KN absorption expansion rate/%

Aspergillus Penicillium Trichoderma Axial Radial niger citrinum viride

Example 79 93 88 2.6 2.1 3.9 1

Example 77 82 91 2.3 1.6 4.1 2

Example 88 85 95 1.9 1.3 4.3 3

The foregoing are merely better examples of the invention and are not intended to

limit the invention, and any modifications, equivalent replacements, improvements, etc.,

made within the spirit and principles of the invention shall be included within the scope of

protection of the invention.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. The environmental protection type bamboo material anti-mold treatment method,

is characterized by the following process steps:

and performing ultrasonic treatment for 1-2h;

S2. Washing the bamboo material after ultrasonic treatment with running water for 1

2h;

1-2h under normal temperature and pressure;

S4. Drying the bamboo material at 30-50°C after which is treated with the anti-mold

agent, and the moisture content is maintained at 8-12%;

for 1-2h under normal temperature and pressure;

at 15-20%;

controlled at 8-12%.

2. According to claim 1, the anti-mildew treatment method for environment-friendly

bamboo materials is characterized in that: S includes that the ultrasonic frequency is

KHz-100KHz, the ultrasonic power is 400-800W, and the ultrasonic temperature is 20

0 C.

3. According to claim 1, the anti-mildew treatment method for environment-friendly

bamboo materials is characterized in that:

The compound anti-fungal agent includes sodium acetate and butyl paraben;

The compound anti-fungal agent includes sodium diacetate and butyl paraben;

The compound anti-fungal agent includes sodium diacetate and propyl paraben,

The mass ratio of the compound anti-fungal agent is 1:1-3:1.

4. According to claim 1, the anti-mildew treatment method for environment-friendly

bamboo materials is characterized in that:

The compound anti-fungal agent is added to a certain amount of water, them stirring

them at 20-50°C for 10-30 minutes to prepare a solution with the concentration of 0.6-1.4%.

5. According to claim 1, the anti-mildew treatment method for environment-friendly

bamboo materials is characterized in that:

The compound paraffin wax emulsion is composed of 20-25 parts of No. 58 food

paraffin, 1.5-2 parts of 2-hydroxy-1,4 naphthoquinone, 2-3 parts of Tween 60, 80-100 parts

of distilled water, which are homogenized at 80-100°C for 1-2h.

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Figure 1.

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Figure 2.