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Modified polyvinyl alcohol, and moisture-absorbing and strength-retaining agent containing same and used for corrugated cartons

A technology for polyvinyl alcohol and corrugated boxes, which is applied in the direction of adding reinforcing agents, manufacturing rigid/semi-rigid containers, papermaking, etc., which can solve the problems of easy damage, limited application, and increased packaging costs, so that it is not easy to bend and damage, and improves moisture resistance. Performance, the effect of improving the ring compressive strength

Active Publication Date: 2021-10-19
NINGBO JIAHUA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the currently used corrugated box boards: for example, the corrugated box boards have poor mechanical properties such as strength, are easy to be damaged or torn, and are not very good in moisture resistance, which limits their application in humid environments. Cannot meet the requirements of high-performance packaging corrugated boxes
The current solution is to put a moisture-proof protective layer on the outside of the carton, but it increases the packaging cost. Another way is to coat a layer of moisture-proof agent on the outside of the carton. This method needs to solve the problem of moisture-proof agent and carton. Adhesive force and moisture-proof agent are easy to peel off. At present, neither of them has achieved the desired effect.

Method used

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  • Modified polyvinyl alcohol, and moisture-absorbing and strength-retaining agent containing same and used for corrugated cartons
  • Modified polyvinyl alcohol, and moisture-absorbing and strength-retaining agent containing same and used for corrugated cartons
  • Modified polyvinyl alcohol, and moisture-absorbing and strength-retaining agent containing same and used for corrugated cartons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of modified polyvinyl alcohol, comprising the following steps:

[0036] Dissolve polyvinyl alcohol in deionized water and swell at room temperature for 2.5h, then heat it up to 90°C to dissolve, wherein the concentration of polyvinyl alcohol is 12.5wt%; dissolve benzoyl oxidized paeoniflorin in ethanol until completely dissolved , so that the concentration of benzoyl oxidized paeoniflorin is 0.55wt%; the benzoyl oxidized paeoniflorin solution is added to the polyethanol alcohol solution, wherein the weight ratio of benzoyl oxidized paeoniflorin to polyvinyl alcohol is 1:6, And the temperature was controlled at 90° C., stirred and refluxed, reacted for 3 hours, cooled to room temperature, and dried to obtain modified polyvinyl alcohol.

Embodiment 2

[0038] A preparation method of modified polyvinyl alcohol, comprising the following steps:

[0039] Dissolve polyvinyl alcohol in deionized water and swell at room temperature for 3.5 hours, then heat it up to 93°C to dissolve, wherein the concentration of polyvinyl alcohol is 13.7wt%; dissolve benzoyl oxidized paeoniflorin in ethanol until completely dissolved , so that the concentration of benzoyl oxidized paeoniflorin is 0.64wt%; the benzoyl oxidized paeoniflorin solution is added to the polyethanol alcohol solution, wherein the weight ratio of benzoyl oxidized paeoniflorin to polyvinyl alcohol is 1:8, And the temperature was controlled at 93° C., stirred and refluxed, reacted for 4 hours, cooled to room temperature, and dried to obtain modified polyvinyl alcohol.

Embodiment 3

[0041] A preparation method of modified polyvinyl alcohol, comprising the following steps:

[0042] Dissolve polyvinyl alcohol in deionized water and swell at room temperature for 3 hours, then heat it up to 95°C to dissolve, wherein the concentration of polyvinyl alcohol is 15wt%; dissolve benzoyl oxidized paeoniflorin in ethanol until completely dissolved, so that The concentration of benzoyl oxidized paeoniflorin is 0.35wt%; the benzoyl oxidized paeoniflorin solution is added to the polyethanol alcohol solution, wherein the weight ratio of benzoyl oxidized paeoniflorin to polyvinyl alcohol is 1:10, and The temperature was controlled at 95°C, stirred and refluxed, reacted for 2.5 hours, cooled to room temperature, and dried to obtain modified polyvinyl alcohol.

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PUM

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Abstract

The invention discloses modified polyvinyl alcohol, and a moisture-absorbing and strength-retaining agent containing the same and used for corrugated cartons. A preparation method for the moisture-absorbing and strength-retaining agent comprises the following steps: adding the modified polyvinyl alcohol, urea, paraformaldehyde, low-carbon alcohol and sodium hydroxide into a dispersion medium, and carrying out uniform stirring and mixing to obtain a mixed material; and heating the mixed material to 85-100 DEG C, then adding an aldehyde capturing agent, continuing stirring for 1-3 hours, conducting cooling to room temperature, and adding a pH regulator to regulate a pH value, thereby obtaining the moisture-absorbing and strength-retaining agent for the corrugated cartons. The modified polyvinyl alcohol is prepared from benzoyl oxidized paeoniflorin modified polyvinyl alcohol. According to the invention, the modified polyvinyl alcohol with certain hydrophobic property is obtained, and is used as a component of the moisture-absorbing and strength-retaining agent for the corrugated cartons in the corrugated cartons, so the corrugated cartons have higher ring crush compression resistance and folding strength and excellent moisture resistance and stiffness, and the corrugated cartons with excellent quality are obtained.

Description

technical field [0001] The invention belongs to the technical field of papermaking auxiliary agents, and in particular relates to a modified polyvinyl alcohol and an agent for maintaining moisture absorption strength of a corrugated box containing the modified polyvinyl alcohol. Background technique [0002] Corrugated box is an ideal packaging container, which is light, strong, vibration-absorbing and suitable for mechanized production. It has been used for transportation packaging and sales packaging for many years. However, there are still some problems in the currently used corrugated box boards: for example, the corrugated box boards have poor mechanical properties such as strength, are easy to be damaged or torn, and are not very good in moisture resistance, which limits their application in humid environments. It cannot meet the requirements of high-performance packaging corrugated boxes. The current solution is to put a moisture-proof protective layer on the outside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H21/20D21H19/20D21H19/14D21H19/26B31B50/74
CPCD21H21/16D21H21/20D21H19/20D21H19/14D21H19/26B31B50/742Y02W30/80
Inventor 任阳进夏春生千胜宇葛政台
Owner NINGBO JIAHUA NEW MATERIAL TECH CO LTD
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