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A preparation process of water-soluble bio-based sulfate/sulfonate and its use as a green and environmentally friendly adhesive

A technology of viscose and cellulose sulfate, applied in the field of cellulose sulfate, can solve the problems of poor bonding effect of soluble starch, impossibility of popularization and difficult biodegradability, etc., and achieve excellent water solubility and polymer performance , cheap preparation cost, low cost effect

Active Publication Date: 2018-01-23
SOUTHWEST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its good bonding effect, simple production and low cost, urea-formaldehyde resin is currently the most widely used synthetic polymer adhesive. However, due to the residual and long-term release of formaldehyde, it has been seriously endangering human health, and an environmentally friendly alternative is urgently needed. Taste
[0005] The main varieties of existing water-soluble binders are urea-formaldehyde resin, polyvinyl alcohol, polyvinyl formal and soluble starch, etc. Due to environmental protection and refractory biodegradability, the use of formaldehyde series viscose in many industries such as packaging has been restricted , and soluble starch cannot be widely used due to poor bonding effect

Method used

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  • A preparation process of water-soluble bio-based sulfate/sulfonate and its use as a green and environmentally friendly adhesive
  • A preparation process of water-soluble bio-based sulfate/sulfonate and its use as a green and environmentally friendly adhesive
  • A preparation process of water-soluble bio-based sulfate/sulfonate and its use as a green and environmentally friendly adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Liquid SO 3 Soluble in cooled 1,2-dichloroethane to form SO 3 SO with a concentration of 2.9mol / L 3 Dichloroethane solution, under stirring, suspend 80.0g of industrial pulp dried under vacuum at 110°C for 1h in 1600mL of 1,2-dichloroethane, add 200.0mL of SO 3 SO with a concentration of 2.9mol / L 3 / dichloroethane solution, control the temperature rise not to exceed 35°C, adjust the stirring speed to 900rpm, filter and remove the solvent after 4 hours of reaction, slowly add the solid material to a 2.0mol / L-25°C NaOH ice-water mixture for neutralization, and control the temperature No more than 15°C, filter to remove the water-insoluble solid residue, weigh and calculate the conversion rate, the conversion rate is 70%, the degree of substitution (DS) of the product is 1.0, and the adjusted pH is respectively 3, 4, 5, 6, 7 and 8 five liquid products to obtain water-soluble bio-based sulfate adhesives with different pH. According to the national standard GB7124-86, th...

Embodiment 2

[0041] The liquid product with pH=5 obtained in Example 1 was concentrated to obtain water-soluble biomass-based sulfate viscose adhesives with solid contents of 34.0%, 51.1%, 68.0% and 80%, respectively. According to the national standard GB7124-86 to test its adhesiveness, use wood as the test material, see Table 2 for specific data.

[0042]

[0043] Table 2 The tensile shear strength of different solid content bio-based sulfate salts on wood boards

[0044] It can be seen from the data in Table 2 that the tensile shear strength is the highest when the solid content is within 70%.

Embodiment 3

[0046] Gas SO 3 Soluble in 1,2-dichloroethane at -3°C to form SO 3 SO with a concentration of 0.5mol / L 3 Dichloroethane solution, soak 50.0g of bagasse that has been dried under vacuum at 115°C for 5h in 1520mL of 1,2-dichloroethane at 25°C under stirring, add 500.0mL of SO 3 SO with a concentration of 1.0mol / L 3 / dichloroethane solution, stirred at 10°C for 1h, then filtered to remove the solvent, and slowly added the solid material to 2.0m o In the excess NaOH solution of 1 / L 5 ℃, adjust the pH to 5.0, filter to remove the solid residue, weigh and calculate the conversion rate of raw materials, the conversion rate is 20%, and the water-soluble biomass sulfate ester salt viscosity with a degree of substitution (DS) of 0.4 is obtained. Glue. According to the national standard GB7124-86 to test its adhesiveness, aluminum plate is used as the test material. Please refer to Table 3 for the specific data.

[0047]

[0048] The tensile shear strength of the bio-based sulfat...

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Abstract

The invention provides an adhesive agent, comprising cellulose sulfate, chitosan or / and carboxymethyl chitosan salt, cellulose sulfate accounts for 30-100%, chitosan and / or carboxymethyl chitosan Polysaccharide salt is less than or equal to 20%, calculated by mass ratio. The invention utilizes the newly discovered sulfonation system and abundant biomass raw materials to develop high-quality, low-cost, green and environmentally friendly water-soluble bio-based binder series products, and replaces the existing urea-formaldehyde resin, polyvinyl alcohol, Polyvinyl formal and soluble starch fundamentally solve the fatal defects of existing adhesives such as urea-formaldehyde resin and polyvinyl formal that have high formaldehyde residues, long-term release, and serious harm to human health, as well as natural high levels of soluble starch. The problem of poor molecular bonding effect and large dosage. The present invention obtains a high yield of stable bio-based sulfate / sulfonate adhesives. Extensive sources of raw materials and cheap preparation costs, excellent water solubility and high molecular properties, and multiple advantages such as formaldehyde-free and green environmental protection can expand the wide application prospects of this series of adhesives.

Description

technical field [0001] This invention relates to viscose, and more particularly to cellulose sulfate. Background technique [0002] Cellulose and lignin are the most widely distributed and most abundant biomass-based polymers in nature. The annual production of cellulose through photosynthesis in nature reaches 200 billion tons, accounting for more than 50% of the carbon content in the plant kingdom. It is the oldest on earth. , the most abundant natural polymer, is the most precious, inexhaustible natural renewable resource. Cellulose is a linear polymer formed by connecting D-glucofuranosides with β-1,4 glycosidic bonds. The chemical formula is (C6H10O5)n, where n is the number of D-glucofuranosides. In the molecular structure of cellulose Each glucose unit contains three free alcoholic hydroxyl groups, which are highly hydrophilic, and the strong hydrogen bonds between molecules and molecules make the cellulose macromolecules actually form fibers with high crystallinity,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J101/16C09J105/08C09J197/00C08B5/14
Inventor 莫云周光明周福亚阙元昌尹应武
Owner SOUTHWEST UNIV
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