Preparing method for AKD (Alkyl Ketene Dimer) latex

An emulsion and modification technology, which is applied in the direction of fiber dispersant addition, water repellent addition, and no pigment coating, etc., can solve the problems of complex waste paper sources, affecting paper drainage and forming, and uneconomical problems, and achieve improvement Sizing effect, dense microstructure, reducing the effect of false sizing

Active Publication Date: 2012-07-04
广州星业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Since recycled pulp is used more and the source of waste paper is complicated, the volatility of pulp is increased, which also leads to the instability of sizing in pulp, and the effect of sizing in pulp is limited
[0005] (2) Adding in slurry increases the use of chemicals in the slurry system and affects the use of other chemicals (such as retention and drainage aids, enhancers, etc.)
[0006] (3) The one-way retention rate of the sizing agent in the slurry is preferably less than 90%, and many rosin sizing agents are only about 60%. The lost sizing agent will form various resins and anionic garbage in the slurry system After a certain period of accumulation, it will affect the water filtration and forming of the next paper, affect the strength of the paper, and even stain the net and felt, thus affecting normal production
The patent does not mention the possibility of using the AKD emulsion as a surface sizing agent, nor does it mention the aging speed and specific sizing effect of the AKD emulsion
At the same time, this patent uses a large amount of co-solvents in the preparation of amphoteric polymer surfactants, which is not environmentally friendly and economical
[0011] There are also some AKD emulsions mentioned in other patents and literatures, which have some problems in terms of curing speed, sizing effect, cost performance, environmental protection, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 37.15g of acrylamide, 1.25g of acrylic acid, 2.75g of N,N-dimethylamine ethyl methacrylate, 8.14g of N,N-dimethyl-N-dodecylmethyl allyl into a 500mL reactor Hydroxyl ammonium chloride, 1.05g sodium methallylsulfonate, 1.42g hydrochloric acid (31wt%, wt% represents weight percentage, the same below) and 190g water, feed nitrogen, heat to 50 ° C, then add 10g8wt% Sodium persulfate aqueous solution and 2g 8wt% sodium bisulfite aqueous solution were gradually heated to 95°C within 2 hours, and the reaction was continued for 1 hour to obtain modified polyacrylamide 1 with a solid content of 20%.

[0045] Add 20g of dodecanedioic acid, 100g of adipic acid, and 84.3g of diethylenetriamine into a 500mL reactor, stir, heat to reflux under normal pressure, vacuumize and dehydrate after 6h, vacuum degree -0.097Mpa, when the temperature rises to At 180°C, stop vacuuming, continue to keep warm for 4 hours, then lower the temperature to 140°C, add 176g of water, and obtain polyam...

Embodiment 2

[0049] Add 113g of adipic acid and 84.3g of diethylenetriamine into a 500mL reactor, stir, heat to reflux under normal pressure, vacuumize and dehydrate after 5h, the vacuum degree is -0.098Mpa, when the temperature rises to 185°C, stop vacuuming , continue to keep warm for 3h, then lower the temperature to 140°C, and add 169g of water to obtain polyamide 2.

[0050] Add 24.8 g of 2,3-epoxypropyltrimethylammonium chloride to polyamide 2, heat to 60° C., and keep warm for 4 hours to obtain modified polyamide 2 with a solid content of 54%.

[0051] Weigh 7g of modified polyamide 2, 130g of modified polyacrylamide 1 (see Example 1 for the preparation method) and 190g of water in a 1000mL reactor, adjust the pH to 4.2, heat to 70°C, and add 130g of molten AKD , after pre-dispersion, perform homogenization treatment, then add 610g of ice water to dilute, and cool to below 20°C to obtain AKD emulsion 2 with a solid content of 15%.

Embodiment 3

[0053] Add 17.6g of sebacic acid, 100g of adipic acid, and 84.3g of diethylenetriamine into a 500mL reactor, stir, and heat to reflux under normal pressure. After 6h, vacuumize and dehydrate. The vacuum degree is -0.098Mpa. ℃, stop vacuuming, continue to keep warm for 4 hours, then lower the temperature to 140 ℃, add 176g of water, and obtain polyamide 3.

[0054] Add concentrated hydrochloric acid dropwise to polyamide 3, control the temperature below 10°C, adjust the pH value to 2.4, then add 44.5g hydrogen peroxide aqueous solution (50wt%), and then program the temperature at a rate of 10°C / h to 60 After 3 hours of heat preservation at ℃, the modified polyamide 3 was obtained with a solid content of 42%.

[0055] Weigh 11g of modified polyamide 3, 100g of modified polyacrylamide 1 (see Example 1 for the preparation method) and 200g of water in a 1000mL reactor, heat to 70°C, adjust the pH value to 2.0, and add 130g of molten AKD , after pre-dispersion, carry out homogeniza...

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PUM

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Abstract

The invention discloses a preparing method for AKD (Alkyl Ketene Dimer) latex. The method comprises the following steps: taking AKD as a raw material, carrying out pre-dispersion under the action of dispersing agent (modified polyamide) and protective colloid, and carrying out homogeneous treatment, so as to obtain the AKD latex. The AKD latex prepared according to the method can serve as an internal sizing agent and a surface sizing agent, so as to greatly improve the water resistance of paper and paper boards, and has the characteristics of high sizing effect and slaking speed, low impact on paper strength, environmental protection, high efficiency and the like.

Description

technical field [0001] The invention belongs to the field of papermaking chemicals, and in particular relates to an AKD emulsion and a preparation method thereof. Background technique [0002] AKD is the abbreviation of alkyl ketene dimer. It is a waxy solid at room temperature. The AKD emulsion prepared by heating and emulsifying with an emulsifier is a high-efficiency sizing agent that can improve the water resistance of paper and cardboard. The sizing effect of AKD has not been completed after the paper sheet is dried, and only about 80% of it is completed after 24 hours of storage after coiling. After several days, the sizing reaction is still going on, so the AKD sizing process usually adds a curing accelerator. At present, emulsified AKD is mainly used for internal sizing, while the main components of surface sizing agents are basically polymers or mainly polymers, and the cost is relatively high. [0003] In recent years, with the increase in the proportion of waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/55D21H21/08D21H19/30D21H19/14C08G69/26C08G69/36
Inventor 孟巨光秦昌晃黄育苗
Owner 广州星业科技股份有限公司
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