A low-cost formaldehyde-free soybean meal adhesive and its preparation method

Abstract

The invention discloses a low-cost aldehyde-free bean pulp adhesive and a preparation method thereof. The adhesive is prepared from, by weight, 30-33 parts of a main agent, 75 parts of dispersion medium water, 0.1-0.2 part of a viscosity modifier and 1-2 parts of a crosslinking agent; the preparation method of the low-cost aldehyde-free bean pulp adhesive comprises the following steps that firstly, according to the weight ratio, all the components are weighed, the crosslinking agent is added into the dispersion medium water, 15 minutes of ultrasonic treatment is conducted, then, the main agent of the half weight is added, and a high-pressure homogenizer is utilized for conducting homogeneous emulsion for 20 minutes at the pressure of 30 MPa and the emulsifying power of 0.5 MPa; the remaining main agent is added into the prepared mixture, after uniform mixing, sodium hydroxide is added, the pH is adjusted to be 9.0, a reaction is conducted for 20 minutes at 80 DEG C, the temperature is reduced by 30 DEG C, and discharging is conducted; according to the adhesive, a crosslinking structure is easily formed, the crosslinking density is large, the reaction temperature is low, the prepared adhesive is stable in performance, the weak interface layer is obviously lowered, the cost is reduced, the dry / wet strength is high, and the product quality is improved stably.

Description

technical field

[0001] The invention relates to the field of plywood preparation, in particular to a low-cost formaldehyde-free soybean meal adhesive and a preparation method thereof. Background technique

[0002] my country's precious wood resources are relatively scarce, and artificial forest resources are abundant. Using artificial forest fast-growing wood to prepare wood-based panels through adhesives is the main raw material for furniture floors and interior decoration in the living environment. In 2017, the total output of my country's wood-based panels was 295 million cubic meters Rice, accounting for about 50% of the world's total output, of which more than 60% are plywood products. Based on the average production of 9 cubic meters of wood-based panels per ton of adhesive, the consumption of adhesives for plywood in my country in 2017 was about 18 million tons (solid content 50%), of which urea-formaldehyde resin and its modified products accounted for the total outpu...

Examples

Embodiment 1

[0036] This embodiment provides a method for preparing a soybean meal protein adhesive, and the adhesive is prepared according to the following weight ratio:

[0037] Modified soybean meal 30 kg

[0038] Polyacrylamide 0.1kg

[0039] Surface Modified Nanocellulose 1.0kg

[0040] This embodiment provides a preparation method of soybean meal-based adhesive, comprising the following steps:

[0041] (1) Weigh the components according to the weight ratio, add the surface-modified nanocellulose into the dispersion medium water, ultrasonicate for 15 minutes, and then add half the weight of modified soybean meal, use a high-pressure homogenizer, under 30MPa pressure and 0.5MPa Under the action of emulsifying force, homogeneously emulsify for 20 minutes;

[0042] (2) Add the remaining modified soybean meal to the mixture obtained in step (1), mix well, add sodium hydroxide to adjust pH=9.0, react at 80°C for 20min, cool down to 30°C and discharge.

Embodiment 2

[0044] This embodiment provides a method for preparing a soybean meal protein adhesive, and the adhesive is prepared according to the following weight ratio:

[0045] Modified soybean meal 33 kg

[0046] Polyacrylamide 0.2kg

[0047] Surface Modified Nanocellulose 2.0kg

[0048] The preparation method of the adhesive described in this embodiment is the same as that in Example 1.

technical field

[0001] The invention relates to the field of plywood preparation, in particular to a low-cost formaldehyde-free soybean meal adhesive and a preparation method thereof. Background technique

[0002] my country's precious wood resources are relatively scarce, and artificial forest resources are abundant. Using artificial forest fast-growing wood to prepare wood-based panels through adhesives is the main raw material for furniture floors and interior decoration in the living environment. In 2017, the total output of my country's wood-based panels was 295 million cubic meters Rice, accounting for about 50% of the world's total output, of which more than 60% are plywood products. Based on the average production of 9 cubic meters of wood-based panels per ton of adhesive, the consumption of adhesives for plywood in my country in 2017 was about 18 million tons (solid content 50%), of which urea-formaldehyde resin and its modified products accounted for the total outpu...

Examples

Embodiment 1

[0036] This embodiment provides a method for preparing a soybean meal protein adhesive, and the adhesive is prepared according to the following weight ratio:

[0037] Modified soybean meal 30 kg

[0038] Polyacrylamide 0.1kg

[0039] Surface Modified Nanocellulose 1.0kg

[0040] This embodiment provides a preparation method of soybean meal-based adhesive, comprising the following steps:

[0041] (1) Weigh the components according to the weight ratio, add the surface-modified nanocellulose into the dispersion medium water, ultrasonicate for 15 minutes, and then add half the weight of modified soybean meal, use a high-pressure homogenizer, under 30MPa pressure and 0.5MPa Under the action of emulsifying force, homogeneously emulsify for 20 minutes;

[0042] (2) Add the remaining modified soybean meal to the mixture obtained in step (1), mix well, add sodium hydroxide to adjust pH=9.0, react at 80°C for 20min, cool down to 30°C and discharge.

Embodiment 2

[0044] This embodiment provides a method for preparing a soybean meal protein adhesive, and the adhesive is prepared according to the following weight ratio:

[0045] Modified soybean meal 33 kg

[0046] Polyacrylamide 0.2kg

[0047] Surface Modified Nanocellulose 2.0kg

[0048] The preparation method of the adhesive described in this embodiment is the same as that in Example 1.

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