CN103045136B - Environment-friendly high-speed cigarette holder glue for cigarettes and preparation method thereof - Google Patents

Abstract

The invention discloses an environment-friendly high-speed joint glue for cigarettes and a preparation method thereof. The environmentally friendly high-speed joint glue is based on VAE emulsion, and is polymerized and modified by adding vinyl acetate, acrylic acid, and butyl acrylate. The plasticizer is an environmentally friendly plasticizer, and the hydroxyl group of PVA is blocked with amino resin. The mouthpiece glue basically does not contain aldehydes and phthalates that are harmful to the human body. The residual amount of vinyl acetate monomer is low, the solid content is 47.4-52.0%, and the viscosity is 2800-3300mPa·s. The initial tack, bonding strength and water resistance are suitable for high-speed cigarette making machines with a speed of 12000-15000 cigarettes per minute.

Description

A kind of preparation method of environment-friendly high-speed joint glue for cigarette

technical field

The invention relates to an environment-friendly high-speed mouth glue and a preparation method thereof, in particular to a preparation method of an environment-friendly high-speed mouth glue for cigarettes, and belongs to the field of cigarette adhesives.

Background technique

Adhesives for cigarettes are mainly divided into four types: mouthpiece glue, mouthpiece glue, packaging glue and mouth rod forming glue. There are more than 170 cigarette factories in my country, with an annual output of about 36 million boxes, and the cigarette output ranks first in the world. The consumption of tobacco rubber can reach 30,000 tons per year. Among them, mouthpiece glue accounts for the largest share, about 20,000 tons. In recent years, in order to improve production efficiency, the speed of the cigarette machine has been increased from the previous 4000-5000 cigarettes/minute to 8000-15000 cigarettes/minute. Correspondingly, the cigarette adhesive must be able to meet the requirements of high-speed cigarettes. Excellent initial tack, fast drying, strong adhesion, etc.

The viscosity of the mouthpiece glue is 2800-3300mPa s. At present, there are two main types of mouthpiece glue used for high-speed cigarette machines: one is VAE (ethylene-vinyl acetate) latex or polyvinyl acetate (PVAc) latex; the other is One is vinyl acetate and acrylic copolymer emulsion joint glue, through the copolymerization of the two, the purpose of reducing the glass transition temperature of the copolymer is achieved, that is, the effect of internal plasticization is obtained, which is a way to improve the initial viscosity of vinyl acetate emulsion way.

As mentioned in the patent application CN200510031185, the high-viscosity latex is an adhesive based on vinyl acetate. It is used for high-speed cigarette machine joints with a speed of more than 8000 cigarettes per minute. It has good initial viscosity, high bonding strength, smooth bonding, and good storage stability. specialty. A high-speed cigarette mouthpiece glue with good fluidity, good initial tack and good cold resistance can be obtained through the copolymerization of vinyl acetate and acrylates. For example, the vinegar-propylene copolymer high-speed cigarette joint adhesive mentioned by Chen Yuanwu in "FHX-2 High-speed Cigarette Adhesive" is a ternary copolymer emulsion of vinyl acetate, butyl acrylate, and unsaturated carboxylic acid. Addition polymerization method, adding a small amount of molecular weight regulator, makes the molecular weight of the copolymer small, and the copolymer emulsion has good viscosity stability and fluidity, and has the characteristics of high initial tack, fast drying speed, and high bonding strength, which can meet the requirements of splicing. Nozzle speed 7000 ~ 8000 / min requirements. Patent application CN201110068785 mentions water-based ultra-high-speed mouthpiece glue for cigarettes, which is based on vinyl acetate, butyl acrylate, and acrylic acid ternary monomers, and is polymerized under the action of ammonium persulfate-sodium bisulfite composite initiator. into a ternary copolymer emulsion, and then reduce the content of vinyl acetate through vacuuming process and adding lemon tri-n-butyl plasticizer, and adjust the viscosity and solid content technical indicators of the adhesive with water, so that the prepared joint adhesive has strong bonding ability , the machine speed can reach 12000-17000 pieces/min, the content of vinyl acetate is less than 1000mg/kg, the total esters of phthalic acid is less than 500mg/kg, and the content of formaldehyde is less than 50mg/kg.

The protective colloid PVA and plasticizer are used in the preparation of the above joint glue. The hydroxyl group in PVA is easy to absorb water. In order to increase the water resistance of the joint glue, the hydroxyl group must be blocked. The most common method is to use PVA acetal For example, Hou Qiong used PVA formal as a modified tackifier in "EVA Emulsion Modification to Produce High-Speed Cigarette Adhesive", which may cause a certain amount of aldehydes in the mouthpiece; at the same time, the adjacent plasticizer used Phthalates are also harmful substances to the human body. Although the patent application CN201110068785 has adopted tri-n-butyl citrate to improve the plasticizer, vinyl acetate, phthalates, and formaldehyde content are still Higher, and the initial tack, bond strength, and water resistance of the mouthpiece glue need to be improved.

Contents of the invention

The present invention uses VAE emulsion as base material, and adds vinyl acetate, acrylic acid, butyl acrylate to carry out polymerization modification, improves initial viscosity and bonding strength, and plasticizer adopts environment-friendly plasticizer; The water resistance is improved while the formaldehyde content is reduced, and the obtained mouthpiece glue basically does not contain aldehydes and phthalates which are harmful to the human body, and the residual amount of vinyl acetate monomer is low, which is environmentally friendly.

In order to achieve the above object, the present invention adopts the following technical solutions:

Environmentally friendly high-speed joint glue is made of raw materials with the following weight content:

The VAE emulsion is a commercially available model BJ-707 with a solid content of 55%.

Described environment-friendly plasticizer is tributyl citrate or epoxidized soybean oil;

The PVA is self-made by mixing and dissolving 1788 and 1799 at a ratio of 2:1, with a solid content of 15%;

Described initiator is ammonium persulfate or potassium persulfate;

The emulsifier is any one of OP-10 or TX-10 or mixed in any proportion;

The pH regulator is any one of sodium malate, sodium bicarbonate or sodium dihydrogen phosphate mixed in any proportion;

The defoamer is ethanol, which not only has no special smell of other alcohols, but also has excellent defoaming effect;

The present invention further provides a method for preparing an environment-friendly high-speed joint glue, which comprises the following steps:

1) Take 42-50% of VAE emulsion and put it into a sealed container, turn on the mixer, set the stirring speed to 100-150 rpm, and add 15-18% of VAc and 3-6% of butyl acrylate to the container in sequence Esters, 0.6-1.2% acrylic acid and some deionized water (accounting for about half of the total amount of deionized water), and then continue to stir and mix evenly;

2) Turn on the heating device, heat up to 70-75°C, add a certain amount of initiator (about one-third of the total initiator dose), adjust the stirring speed to 200-250 rpm, and continue to heat up to 85- At 90°C, the remainder of the initiator was added over 1 hour. Heat up to 95°C again, add 6-10% of PVA, 0.5-1.2% of amino resin, and keep stirring for 1-1.2 hours. Cool down to 45-55°C, add 1-2.2% environmentally friendly plasticizer, 0.1-0.8% emulsifier, 0.02-0.05% pH regulator, 0.1-0.5% defoamer and the remaining deionized water in order, and continue stirring About 0.8-1.5 hours, let stand to cool, filter and discharge.

The environmentally friendly high-speed joint glue prepared by the above scheme has low cost, and the method of capping the hydroxyl groups of PVA with amino resin avoids the introduction of aldehydes, and the environmentally friendly plasticizer is non-phthalate. Mouth glue basically does not contain aldehydes and phthalates that are harmful to the human body, and the residual amount of vinyl acetate monomer is low, with a solid content of 45.2-52% and a viscosity of 2800-3300mPa·s. Initial tack, bonding strength and water resistance, suitable for high-speed cigarette making machines with a speed of 12000-15000 cigarettes per minute.

After the environmental-friendly high-speed joint glue of the present invention is tested, each performance index is as follows:

Detailed ways

Example 1

Get 42 kg of VAE emulsion into a sealed container, turn on the mixer, set the stirring speed to 100 rpm, add 18 kg of VAc, 3 kg of butyl acrylate, 1.2 kg of acrylic acid and 12 kg of deionized water, stirring continuously to mix well. Turn on the heating device, heat up to 70°C, add 0.2 kg of initiator, adjust the stirring speed to 200 rpm, and continue to heat up to 85°C, and add the remaining initiator within 1 hour. Heat up to 95°C again, add 6 kg of PVA and 1.2 kg of amino resin, and keep stirring for 1 hour. Cool down to 48°C, add 2.2 kg of environmentally friendly plasticizer, 0.7 kg of emulsifier, 0.05 kg of pH regulator, 0.35 kg of defoamer and the remaining deionized water in order, continue to stir for about 0.8-1.5 hours, and let it stand for cooling. Filter the discharge.

Example 2

Take 50 kg of VAE emulsion and add it to a sealed container, turn on the mixer, set the stirring speed to 120 rpm, add 15 kg of VAc, 6 kg of butyl acrylate, 0.8 kg of acrylic acid and 6 kg of deionized water, stirring continuously to mix well. Turn on the heating device, heat up to 75°C, add 0.12 kg of initiator (accounting for about one-third of the total initiator dose), adjust the stirring speed to 250 rpm, and continue to heat up to 90°C, within 1 hour The remaining initiator was added to completion. Heat up to 95°C again, add 6 kg of PVA and 0.6 kg of amino resin, and keep stirring for 1.2 hours. Cool down to 55°C, add 1 kg of environmentally friendly plasticizer, 0.8 kg of emulsifier, 0.02 kg of pH regulator, 0.41 kg of defoamer and the remaining deionized water in order, continue to stir for about 1.5 hours, let stand to cool, and filter out material.

Example 3

Take 46 kg of VAE emulsion and add it to a sealed container, turn on the mixer, set the stirring speed to 110 rpm, add 18 kg of VAc, 4 kg of butyl acrylate, 0.6 kg of acrylic acid and 10 kg of After deionized water, keep stirring to mix well. Turn on the heating device, heat up to 73°C, add 0.1 kg of initiator, adjust the stirring speed to 240 rpm, and continue to heat up to 89°C, and add the remaining initiator within 1 hour. Heat up to 95°C again, add 7 kg of PVA and 0.5 kg of amino resin, and keep stirring for 1 hour. Cool down to 50°C, add 2 kg of environmentally friendly plasticizer, 0.3 kg of emulsifier, 0.03 kg of pH regulator, 0.5 kg of defoamer and the remaining deionized water in order, continue to stir for about 1 hour, let stand to cool, and filter out material.

Example 4

Take 44 kg of VAE emulsion and add it to a sealed container, turn on the mixer, set the stirring speed to 120 rpm, add 17 kg of VAc, 6 kg of butyl acrylate, 1 kg of acrylic acid and 9 kg of After deionized water, keep stirring to mix well. Turn on the heating device, heat up to 70°C, add 0.2 kg of initiator, adjust the stirring speed to 200 rpm, and continue to heat up to 87°C, and add the remaining initiator within 1 hour. Heat up to 95°C again, add 9 kg of PVA and 1.2 kg of amino resin, and keep stirring for 1.2 hours. Cool down to 48°C, add 1.9 kg of environmentally friendly plasticizer, 0.6 kg of emulsifier, 0.04 kg of pH regulator, 0.1 kg of defoamer and the remaining deionized water in order, continue to stir for about 1.4 hours, let stand to cool, and filter out material.

Example 5

Take 45 kg of VAE emulsion and add it to a sealed container, turn on the mixer, set the stirring speed to 100-150 rpm, add 16 kg of VAc, 5 kg of butyl acrylate, 0.7 kg of acrylic acid and 11 After adding one kilogram of deionized water, keep stirring to mix well. Turn on the heating device, heat up to 75°C, add 0.2 kg of initiator, adjust the stirring speed to 220 rpm, and continue to heat up to 88°C, and add the remaining initiator within 1 hour. Heat up to 95°C again, add 8 kg of PVA and 0.8 kg of amino resin, and keep stirring for 1.1 hours. Cool down to 52°C, add 1.7 kg of environmentally friendly plasticizer, 0.5 kg of emulsifier, 0.05 kg of pH regulator, 0.2 kg of defoamer and the remaining deionized water in order, continue to stir for about 1.2 hours, let stand to cool, and filter out material.

Example 6

Get 48 kg of VAE emulsion into a sealed container, turn on the mixer, set the stirring speed to 130 rpm, add 17.5 kg of VAc, 4.8 kg of butyl acrylate, 0.9 kg of acrylic acid and 8 kg of After deionized water, keep stirring to mix well. Turn on the heating device, heat up to 72°C, add 0.2 kg of initiator, adjust the stirring speed to 210 rpm, and continue to heat up to 86°C, and add the remaining initiator within 1 hour. Heat up to 95°C again, add 10 kg of PVA and 0.7 kg of amino resin, and keep stirring for 1.2 hours. Cool down to 55°C, add 1.5 kg of environmentally friendly plasticizer, 0.4 kg of emulsifier, 0.02 kg of pH regulator, 0.3 kg of defoamer and the remaining deionized water in order, continue to stir for about 1.5 hours, let stand to cool, and filter out material.

Example 7

Get 49 kg of VAE emulsion into a sealed container, turn on the mixer, set the stirring speed to 150 rpm, add 16.5 kg of VAc, 5.4 kg of butyl acrylate, 1.1 kg of acrylic acid and 9 kg of After deionized water, keep stirring to mix well. Turn on the heating device, heat up to 75°C, add 0.1 kg of initiator, adjust the stirring speed to 200 rpm, and continue to heat up to 90°C, and add the remaining initiator within 1 hour. The temperature was raised to 95°C again, 7.5 kg of PVA and 0.9 kg of amino resin were added, and kept stirring for 1 hour. Cool down to 45°C, add 1.2 kg of environmentally friendly plasticizer, 0.1 kg of emulsifier, 0.05 kg of pH regulator, 0.4 kg of defoamer and the remaining deionized water in order, continue to stir for about 0.8 hours, let stand to cool, and filter out material.

Claims (8)

1. a kind of preparation method of environment-friendly type high-speed joint glue for cigarette is characterized in that, according to the following steps: 1) Take 42-50% of VAE emulsion and put it into a sealed container, turn on the mixer, set the stirring speed to 100-150 rpm, and add 15-18% of VAc and 3-6% of butyl acrylate to the container in sequence Esters, 0.6-1.2% acrylic acid, finally add deionized water, the amount added is half of the total amount of 15-27% deionized water, and then continue to stir and mix evenly; 2) Turn on the heating device, heat up to 70-75°C, add an initiator, the amount of which is 0.2-0.6% of the total amount of initiator, adjust the stirring speed to 200-250 rpm, and continue to heat up to 85-90°C, add the remaining initiator within 1 hour; raise the temperature to 95°C again, add PVA 6-10%, amino resin 0.5-1.2%, keep stirring for 1-1.2 hours, cool down to 45 -55°C, add 1-2.2% environmentally friendly plasticizer, 0.1-0.8% emulsifier, 0.02-0.05% pH regulator, 0.1-0.5% defoamer and the remaining deionized water in order, and continue stirring for 0.8-1.5 hour, let it stand for cooling, and filter the discharge; The above-mentioned raw material ratio is a percentage based on weight content. 2. a kind of preparation method of environment-friendly high-speed joint glue for cigarettes as claimed in claim 1, is characterized in that, described VAE emulsion is commercially available model and is BJ-707, and solid content is 55%. 3. A method for preparing an environment-friendly high-speed mouthpiece glue for cigarettes as claimed in claim 1, wherein the PVA is made by mixing and dissolving 1788 and 1799 according to a ratio of 2:1, and the solid content is 15 %. 4. a kind of preparation method of environment-friendly type high-speed joint glue for cigarettes as claimed in claim 1, is characterized in that, described environment-friendly plasticizer is tributyl citrate or epoxidized soybean oil. 5. a kind of preparation method of environment-friendly type high-speed joint glue for cigarettes as claimed in claim 1, is characterized in that, described initiator is ammonium persulfate or potassium persulfate. 6. A method for preparing an environment-friendly high-speed mouthpiece glue for cigarettes as claimed in claim 1, wherein the emulsifier is any one of OP-10 or TX-10 or mixed in any proportion. 7. A preparation method of an environment-friendly high-speed mouthpiece glue for cigarettes as claimed in claim 1, wherein said pH regulator is any one of sodium malate, sodium bicarbonate or sodium dihydrogen phosphate Mix in any proportion. 8. A preparation method of an environment-friendly high-speed mouthpiece glue for cigarettes as claimed in claim 1, wherein said defoamer is ethanol.