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Environment-friendly PVA solid glue and preparation method thereof

A solid glue, environmental protection technology, applied in the direction of glue sticks, adhesives, adhesive types, etc., can solve the problems of non-fine texture, affecting coating performance, formaldehyde removal, etc., and achieve the effect of cheap production cost and improved performance

Inactive Publication Date: 2017-11-28
NINGBO PASCO UNITED IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the texture of this glue stick is not delicate, which affects the spreadability during use
[0003] Glue sticks made from polyvinyl acetal contain residual aldehydes, and aldehydes, especially formaldehyde and acetaldehyde, are harmful to human health if exposed to them for a long time, such as Chen Yonghong (China Adhesives. 2001, 10 (3): 21-23) have studied with polyvinyl alcohol, formaldehyde, urea, sodium stearate etc. as main raw material and prepare the formula and the technological condition of solid glue stick, although the solid glue stick of production, reduce glue stick with urea The content of formaldehyde in the medium, but can not really remove the formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] A preparation method of environment-friendly PVA solid glue, comprising the following steps:

[0056] Step 1, prepare raw materials;

[0057] Step 2. Add deionized water into the reaction kettle, stir slowly and add polyvinyl alcohol powder, wait for 20-30 minutes, so that the polyvinyl alcohol powder is fully infiltrated;

[0058] Step 3. Next, let the steam flow while stirring to raise the temperature of the mixture to 60°C to swell the PVA. After adding a humectant and half of the defoamer, raise the temperature to 95°C, keep the temperature constant for 30-60 minutes, and stir until the solution is uniform;

[0059] Step 4. After cooling to room temperature, slowly add an acid regulator to adjust the pH value to 4.5-5.5, then add a silicone modifier, and stir until the solution is transparent and clear;

[0060] Step 5: Add tackifier, and then pass steam while stirring to raise the temperature of the above mixed solution to 80-85°C, add sodium hydroxide to the solu...

Embodiment 1

[0064] Step 1, prepare raw materials according to the following weight percentages:

[0065] Deionized water 62.05%, glycerin 7.0%, propylene glycol 5.0%, polyvinyl alcohol (PVA) 15.0%, hydrochloric acid 0.3%, polyacrylic acid emulsion 3.0%, silane coupling agent 0.55%, defoamer 0.3%, sodium hydroxide 0.3 %, sodium stearate 6.0%, sodium sulfite 0.3%, BIT0.20%;

[0066] Step 2. Add deionized water into the reaction kettle, stir slowly and add polyvinyl alcohol powder, wait for 20 minutes, so that the polyvinyl alcohol powder is fully infiltrated;

[0067] Step 3. Next, let the steam flow while stirring to raise the temperature of the mixed solution to 60°C to swell the PVA. After adding a humectant (7.0% glycerin, 5.0% propylene glycol) and half of the defoamer, raise the temperature to 95°C and keep the temperature at 30°C. Minutes, stir until the solution is uniform;

[0068]Step 4. After cooling to room temperature, slowly add an acid regulator to adjust the pH value to 4....

Embodiment 2

[0072] Step 1, prepare raw materials according to the following weight percentages:

[0073] Deionized water 67.05%, glycerin 6.0%, propylene glycol 4.0%, polyvinyl alcohol (PVA) 13.0%, sulfuric acid 0.3%, water-based polyurethane 3.0%, silane coupling agent 0.55%, defoamer 0.3%, sodium hydroxide 0.3% , sodium stearate 5.0%, sodium sulfite 0.3%, OIT 0.20%;

[0074] Step 2. Add deionized water into the reaction kettle, stir slowly and add polyvinyl alcohol powder, wait for 20 minutes, so that the polyvinyl alcohol powder is fully infiltrated;

[0075] Step 3. Next, let the steam flow while stirring to raise the temperature of the mixed solution to 60°C to swell the PVA. After adding a humectant (6.0% glycerin, 4.0% propylene glycol) and half of the defoamer, raise the temperature to 95°C and keep the temperature at 60°C. Minutes, stir until the solution is uniform;

[0076] Step 4. After cooling to room temperature, slowly add an acid regulator to adjust the pH value to 5.5, ...

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Abstract

A kind of environment-friendly PVA solid glue of the present invention comprises deionized water 40.0%-70.0%, humectant 2.0%-15.0%, polyvinyl alcohol 10%-25.0%, acid regulator 0%-1.0%, tackifier 1.0%‑5.0%, silicone modifier 0.05%‑5.0%, defoamer 0%‑0.5%, sodium hydroxide 0.1%‑0.5%, sodium stearate 1.0%‑10.0%, antioxidant 0 %‑0.5%, preservative 0.20%‑0.30%; the preparation method is: add deionized water and polyvinyl alcohol powder in the reaction kettle, add humectant and half of the defoamer after heating by steaming, add acidic acid after cooling to room temperature Regulator to adjust the PH value, then add silicone modifier, then add tackifier, sodium hydroxide, sodium stearate, the remaining half of defoamer, antioxidant and preservative, and let it stand for discharging and filling. Cooling molding obtains PVA solid glue.

Description

technical field [0001] The invention relates to an environment-friendly solid glue, in particular to an environment-friendly PVA solid glue and a preparation method thereof. Background technique [0002] Solid glue stick is also called solid glue. Compared with liquid glue, solid glue stick is not only easy to carry, but also does not flow or stick to hands, so it is very popular. The main adhesives used for solid glue sticks are polyvinyl alcohol (PVA), hydroxymethylcellulose, polyvinylpyrrolidone (PVP), polyvinyl acetal, polymer resin mixture, starch, etc., which are currently on the market. The solid glue mainly uses polyvinylpyrrolidone, polyvinyl alcohol, and polyvinyl formal as adhesives, adding some substances that are easy to solidify and form as gelling agents, and then adding humectants, preservatives, and fragrances. prepared by the drug. The adhesive paper effect of polyvinylpyrrolidone is very good, but its cost is higher; With polyvinyl alcohol as the glue st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J9/00C09J129/04C09J11/06C09J11/08
CPCC09J9/005C08K2201/014C09J11/06C09J11/08C09J129/04C08L33/02C08K13/02C08K5/053C08K5/54C08L75/04C08L3/02
Inventor 钱小华
Owner NINGBO PASCO UNITED IND
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