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Process for producing a crosslinked cellulose ether

A technology of cellulose ether and cellulose, applied in the field of producing cross-linked cellulose ether, can solve problems such as excessive cross-linking affecting the process, and achieve the effects of excellent effectiveness, low water solubility and reduced dosage of cross-linking agent

Pending Publication Date: 2021-11-09
DOW GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because alkalization and etherification reactions are exothermic, there are many factors that can affect whether excessive crosslinking occurs in the process

Method used

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  • Process for producing a crosslinked cellulose ether
  • Process for producing a crosslinked cellulose ether
  • Process for producing a crosslinked cellulose ether

Examples

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example

[0076] The following examples are provided to illustrate the invention in additional detail, but should not be construed as limiting the scope of the claims. All parts and percentages are by weight unless otherwise indicated.

[0077] Various terms and nomenclature used in Inventive Examples (Inv.Ex.) and Comparative Examples (Comp.Ex.) are explained as follows:

[0078] "HEMC" stands for hydroxyethylmethylcellulose.

[0079] "AGU" stands for anhydroglucose unit of cellulose ether.

[0080] "LVN" stands for the Intrinsic Viscosity Number of pulp as measured according to the procedure described in ISO 5351 (2010).

[0081] The various raw materials or ingredients used in the examples are explained below:

[0082] Epilox M 985 is a poly(propylene glycol) diglycidyl ether commercially available from Leuna Harze.

[0083] Examples of diglycidyl ether-based crosslinking compounds useful in the process of the invention are described in Eugene W. Jones, Crosslinking of Cotton Cel...

example 1 and 2

[0089] Inventive Examples 1 and 2 and Comparative Examples A-C

[0090] Typically, HEMC is produced on the principle of Williamson ether synthesis. After activating the ground cellulose with 50% caustic soda, alkalized cellulose is produced. It was then etherified with MCl and EO. For example, a useful guide to this method is found in R. Donges, "Non-Ionic cellulose ethers", British Polymer Journal vol. 23, pp. 315- 326 pages (1990). The crosslinking compounds used in the method of the invention are based on diglycidyl ethers; and a summary of the properties of the crosslinkers used in the examples is described in Table II.

[0091] The intrinsic viscosity number (LVN) of pulp is measured according to the procedure described in ISO 5351 (2010). Ground cellulose fluff (400 mol; LVN greater than or equal to (≧) 1,450 milliliters per gram [mL / g]) was added to a 1,000 liter (L) autoclave (reactor).

[0092] use N 2 After purging the autoclave three times, the autoclave was...

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Abstract

A process for producing a crosslinked cellulose ether including contacting an activated cellulose material with (i) an aqueous crosslinking agent emulsion, wherein the aqueous crosslinking agent emulsion is a mixture of (ia) at least one crosslinking agent; (ib) water; and (ic) any other optional components desired; and (ii) at least one etherification reagent; wherein the aqueous crosslinking agent emulsion (i) and the at least one etherification reagent (ii) react with the activated cellulose material to form the crosslinked cellulose ether; and a crosslinked cellulose ether produced by the above process.

Description

technical field [0001] The present invention relates to a process for producing crosslinked cellulose ethers and to crosslinked cellulose ethers prepared by such a process. Background technique [0002] Cellulose derivatives, such as cellulose ethers, are widely used as thickeners, adhesives, binders and dispersants, water retaining agents, protective colloids, stabilizers and suspending agents due to their excellent properties and physiological safety. agents, emulsifiers and film formers. Furthermore, cellulose ethers are known to be used in dry-mix mortars in various construction applications to improve the rheology of the mortar. Additionally, cellulose ethers are used in mortars to impart water-retaining properties, thereby limiting the loss of water from the mortar to the absorbent substrate. This ensures that sufficient water is available to the hydraulic binder (cement or gypsum) during the setting reaction, resulting in a high mechanical strength of the final prod...

Claims

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Application Information

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IPC IPC(8): C08B11/02C08B11/08C08B15/00
CPCC04B28/02C04B28/14C04B24/383C08B15/005C08B11/08C08B11/02C04B40/0608C04B2103/0062C04B20/023C08B11/20C04B24/386
Inventor A·希尔德J·纽鲍尔S·施密特R·鲍曼
Owner DOW GLOBAL TECH LLC
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