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A starch adhesive based on nano-oxidized cellulose slurry and its preparation method

A technology of starch adhesive and oxidized cellulose, which is used in cellulose adhesives, starch-derived adhesives, adhesives, etc., can solve the problem of limited enhancement of adhesive strength, large energy consumption, and reduced quantum size effect. problems, to achieve the effect of improving compatibility and bonding strength, reducing energy consumption, preventing agglomeration and coagulation

Active Publication Date: 2017-11-10
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, in the preparation process of nanocellulose modified starch glue, the microcrystalline nanocellulose powder prepared earlier is used as raw material. Slurry contains a large amount of solvent, and the process of concentrating and drying it needs to consume a lot of energy; on the other hand, the drying process of using plant fibers to prepare microcrystalline nanocellulose has a greater impact on the morphology and properties of nanofibers , causing a decrease in its quantum size effect, adding it to starch glue has a limited effect on enhancing the adhesive strength

Method used

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  • A starch adhesive based on nano-oxidized cellulose slurry and its preparation method

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Embodiment 1

[0033]A starch adhesive based on nano-oxidized cellulose slurry of the present invention, comprising the raw materials of the following components: 100 grams of oxidized cellulose slurry (solid content 8%) with an oxidation rate of 10%, 10 grams of starch, 2 The gram mass concentration is 30% oxidant H 2 o 2 , 0.2 gram of stabilizer polyvinyl alcohol, 0.1 gram of antiseptic ammonium pentaborate and 1 gram of emulsified paraffin; the nanofiber length in the nano-oxidized cellulose is 40% for a length of 1 to 100 nm; the length of a nanofiber for a content of 100 to 1000 nm 45%; fiber length 1μm ~ 10mm content is 15%.

[0034] The preparation method of the starch adhesive based on the nano-oxidized cellulose slurry of the present embodiment comprises the following steps:

[0035] (1) Take 8 grams of pulp board, add 80 grams of mass concentration to 20% sulfuric acid solution, shear and stir for 1h at a temperature of 50°C (shear rate is 2000rpm), and then add 1 gram of mass co...

Embodiment 2

[0040] A starch adhesive based on nano-oxidized cellulose slurry of the present invention, comprising the raw materials of the following components: 100 grams of oxidized cellulose slurry (solid content 10%) with an oxidation rate of 15%, 20 grams of starch, 5 Gram oxidant NaClO, 0.5 gram stabilizer polyvinyl alcohol, 0.2 gram preservative ammonium pentaborate and 0.5 gram emulsified paraffin; The nanofiber length in the nano-oxidized cellulose is 47% for the nanofiber length of 1~100nm; The nanofiber length is 100~ The content of 1000nm is 40%; the content of fiber length of 1 μm ~ 10mm is 13%.

[0041] The preparation method of the starch adhesive based on the nano-oxidized cellulose slurry of the present embodiment comprises the following steps:

[0042] (1) Take 10 grams of pulp board, add 90 grams of mass concentration to 40% sulfuric acid solution, shear and stir for 1 h (shear rate is 2000 rpm) at a temperature of 55 ° C, then add 1 gram of oxidant NaClO to continue she...

Embodiment 3

[0047] A starch adhesive based on nano-oxidized cellulose slurry of the present invention, comprising the raw materials of the following components: 100 grams of oxidized cellulose slurry with an oxidation rate of 20% (solid content 12%), 30 grams of starch, 5 The gram mass concentration is 30% oxidant H 2 o 2 , 1 gram of stabilizer polyvinyl alcohol, 1 gram of antiseptic ammonium pentaborate and 1 gram of emulsified paraffin; the nanofiber length in the nano-oxidized cellulose is 60%; the nanofiber length is 100~1000nm 35%; fiber length 1μm ~ 10mm content is 10%.

[0048] The preparation method of the starch adhesive based on the nano-oxidized cellulose slurry of the present embodiment comprises the following steps:

[0049] (1) Take 10 grams of pulp board, add 90 grams of concentration into 50% sulfuric acid solution, shear and stir for 2 hours at a temperature of 55°C (shear rate is 4000rpm), then add 2 grams of oxidant with a mass concentration of 30% h 2 o 2 Continue...

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Abstract

The invention discloses a starch adhesive with nanometer oxidized cellulose size as the matrix. The starch adhesive is prepared from, by weight, 100 parts of nanometer oxidized cellulose size with the oxidation rate of 5-30%, 10-40 parts of starch, 2-5 parts of oxidizing agent, 0.1-2 parts of stabilizer, 0.1-2 parts of preservative and 0.1-2 parts of emulsified paraffin. The preparation method includes the steps of preparing nanometer oxidized cellulose size the with oxidation rate of 5-30%, adding starch and 2-5 parts of oxidizing agent to the prepared nanometer oxidized cellulose size in batches, adding stabilizer, preservative and emulsified paraffin after sufficient stirring, and sufficiently stirring the components at a temperature of 50-70 DEG C till all the components are evenly dispersed to obtain the starch adhesive. The starch adhesive is high in bonding strength and high in water resistance. By means of the preparation method, the solvent replacement and drying process is avoided, energy consumption is greatly lowered, and labor intensity is reduced.

Description

technical field [0001] The invention relates to an adhesive and a preparation method thereof, in particular to a starch adhesive with nano-oxidized cellulose slurry as a matrix and a preparation method thereof. Background technique [0002] With the promulgation of environmental protection laws and the enhancement of people's health awareness, the state has become more and more strict on the volatilization of free formaldehyde in acetal adhesives. The "trialdehyde glue" (urea-formaldehyde resin, phenolic resin and melamine-formaldehyde resin adhesive) commonly used in the field of wood processing at present releases a large amount of formaldehyde in the process of production and use, causing environmental pollution and endangering public health. Therefore, the development of non-toxic and environmentally friendly wood adhesives will be the focus of future research. [0003] Starch adhesive, as an environment-friendly natural adhesive, has attracted more and more attention f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J101/04C09J103/10C09J11/04C09J11/08C08B15/02C08B15/04C08B31/18
CPCC08B15/02C08B15/04C08B31/18C08L2205/035C09J11/04C09J11/08C09J101/04C08L3/10C08L29/04C08K2003/387
Inventor 黄自知胡云楚袁利萍冯斯宇卿彦吴义强
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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