KR20030049627A - Method for producing polymer for toner, ink and coating agent by recycling waste polyester - Google Patents

Abstract

PURPOSE: A polyester resin of high value added for use in an ink jet ink binder and a binder for a toner used in copying machines, printers, electro-photographic devices, printing inks, paints or adhesives is provided by using a recycled waste polyester. CONSTITUTION: The process for preparing polyester polymer resin by using a recycled waste polyester comprises the steps of: (a) carrying out the first depolymerization of polyethylene terephthalate by a solid resin dissolving agent, and then adding a polybasic acid to the dissolved polymer to perform the second depolymerization and addition at the same time; (b) adding a polyhydric alcohol to the product obtained in the step (a) to perform polycondensation in the presence of a tin based catalyst so that a polymer having an acid value of 10 to 150 mgKOH/g, an average molecular weight of 3,000 to 50,000 and a softening point of 70 to 150 deg.C can be formed; (c) neutralizing the polymer obtained in the step (b) which has acid value greater than 20 mgKOH/g with a basic compound and dissolving and diluting it in a water based solvent to obtain a water soluble polyester resin, while forming solid resins from the polymer having acid value les than 15 mgKOH/g.

Description

Recycling waste polyester to produce polymers for toners, inks and coatings, and compositions thereof

The present invention relates to a method for producing a polyester resin composition for advanced new materials by recycling waste polyethylene derephthalate (hereinafter referred to as PET). Recently, PET is widely used as a plastic material, such as fibers, PET bottles, films, and injection molding materials, so that the amount of wastes generated during and after the manufacturing process and the use thereof becomes an environmental problem. It was a technical level of physically hot-melting to make deformations, so the quality of recycled products was not satisfactory, and the amount of recycling was extremely limited. Therefore, it is a big problem in their processing and there is an urgent need for a solution to solve this problem. Moreover, research and manufacture for obtaining high functional materials have not been made until now. The present inventors earnestly researched to solve the above problems, and as a result, depolymerized waste PET into rosin and rosin derivative petroleum resin dicyclopentadiene resin, followed by addition reaction with polyhydrochloric acid to add polyhydric alcohol, resulting in polycondensation reaction, resulting in desired physical properties. The present invention was completed by the conclusion that the result of the chemical treatment by the source technology can be produced as a useful high-tech product with high value by obtaining the polymer of.

(1) depolymerizing (A) waste polyethylene terephthalate (hereinafter referred to as PET) with a solid resin solubilizer and (B) addition reaction with secondary depolymerization with polybasic acid; (2) adding polyhydric alcohol to the product obtained in step (1) to produce a polycondensation reaction using a tin catalyst to prepare a polymer having an acid value of 10 to 90 mgKOH / g, a weight average molecular weight of 3,000 to 50,000, and a softening point of 70 to 150 ° C. (3) a polymer comprising a polymer having an acid value of 20 mg KOH / g or more in the polymer obtained in step (2), neutralized with a basic aqueous solution, dissolved in a water or water affinity solvent and a solution mixed with water to produce a water-soluble binder. Preparing an ester resin composition.

These resin compositions are used as binders, inkjet ink binders, etc. as raw materials for photocopier, printing, and electrophotographic polymerization toners, and resin compositions having an acid value of 10 mgKOH / g or less are used as binders for printing inks, paints, adhesives, and grinding toners. Provided is a method for producing a polyester resin which can be used zero.

The PET which can be used in step (1) (A) is a polymer synthesized from terephthalic acid and ethylene glycol, and is a waste PET chip which is mechanically pulverized from waste PET bottle molded products produced during the production of PET fibers. , Terpene resins, petroleum resins and derivatives thereof, dicyclopentadiene and derivatives thereof, gum rosin, wood rosin, thalrosene, hydrogenated rosin, marinized rosin, rosin ester, pinene resin, dipentene resin, C5 Petroleum resins, C9 petroleum resins, DCPD resins, hydrogenated DCPD resins, marinized styrene resins, and the like. These may be used alone or in combination. These are appropriately selected depending on the desired performance. These are preferably mixed with the waste polyester of step (1) (A) in a ratio of 1: 9 to 9: 1.

The polybasic acids which may be used in step (1) (B) are phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, azeline acid, sebacic acid, tetrahydrophthalic anhydride, maleic anhydride, fumaric acid, itanoic acid, trimellitic anhydride, Pyromeric acid, benzoic acid, etc. are mentioned. These may be used alone or in combination. They are preferably added to the product of step (1) (A) in an amount of 10 to 50% by weight.

The polyhydric alcohols that may be used in step (2) are ethylene glycol, propylene glycol, 1.3 propanediol, 1.3 butanediol, 1.6 hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, polypropylene glycol, alkylene of bisphenol A Oxide adducts, trimethylolpropane, glycerin, pentaerythritol and the like, which may be used alone or in combination. They are preferably added in an amount of 10 to 35% by weight to the product of step (1). Organic acid metal or tin catalysts are used. The amount used is 0.05 to 0.5% by weight based on the reactants.

The basic compounds which can be used in step (3) are sodium hydroxide, potassium hydroxide, ammonium hydroxide, lithium hydroxide, amines and the like, which can be used alone or in combination. These are used for neutralization and solubilization to the product obtained in step (2), and it is preferable to add an amount of 5 to 30% by weight. Solvents that can be used in step (3) are alcohols, ethers, acetone, dimethyltoalamide, tetrahydrofu tube, etaglycol, propylglycol, butylglycol and the like, which can be used alone or in combination. It is preferable to add in the amount of 10-50 weight%.

In the production method of the present invention, (1) pre-treated waste PET and solid depolymerization are added in a ratio of 10: 1 to 1: 1, and 0.05 to 0.5% by weight of tin catalyst is first depolymerized at 180 to 280 ° C. 10 to 50% by weight of (2) polybasic acid is added to the product by cooling to below 150 ° C. to depolymerization and addition reaction at a temperature of 160 to 260 ° C. to prepare an acid value of 10 to 150 mg KOH / g reaction product. After adding 50 wt%, condensation polymerization at a temperature of 200 to 260 ° C. to prepare an acid value of 10 to 90 mg KOH / g, a softening point of 70 to 150 ° C., and a weight average molecular weight of 3,000 to 50,000 polyester resin were added to the resin to add water or Preparing a water-soluble polyester resin composition comprising dissolving a hydrophilic solvent and a solution of water in the solvent to produce a polyester water-soluble resin composition, and producing an acid value of 10 mg KOH / g or less resin as a solid resin. It features. This water-soluble polyester resin composition is produced by recycling waste PET, but according to the composition ratio of the raw materials, it is possible to obtain high-performance new materials with high added value at low cost as well as obtaining a desired softening point, compatibility, adhesion, and high functional properties. In particular, this water-soluble polyester resin composition is used as a binder, an inkjet ink binder, etc. when producing toners used in photocopiers, printers, and electrophotographic apparatuses by a polymerization method, and has an acid value of 10 mgKOH / g. The following solid resins are characterized by producing a polyester resin composition which can be used as a binder resin for printing inks, paints, adhesives, grinding methods and toners.

The polyester resin composition of the present invention (1) is used as a resin binder for toners used for developing electrostatic images in electrophotographic images, electrostatic notes, and the like, by adding a colorant, a charge agent, a mold release agent, or the like to a polymerization method or a grinding method. Toner is prepared. The colorants are black pigments such as carbon black and magnetite, yellow pigments such as iron oxide, sulfur kanji yellow, and permanent yellow. Blue pigments such as phthalocyanine blue and viloret. Red pigments such as iron oxide, carmine, toluzinet and quinacridone. Green pigments, such as phthalocyanine green and chrome green, are used, and a coloring agent content is 1-40 weight%. Charge control agents include (+) charge Charge control agents include nigrosine dyes and quaternary ammonium salts. Typical product names are BONTRON N-07. BONTRON N-21 Oriental Chemical Co., Ltd. and negative charge control agents are azo metal complex salts, salicylic acid metal complex salts, etc. Typical product names are BONTRON S-34, BONTRON E-84, Orient Chemical Co., Ltd. The amount of use is preferably 0.5 to 5% by weight based on the binder resin.

The release agent may be 0.5 to 10% by weight of the binder resin alone or in combination with polyethylene wax, polypropylene wax, higher fatty acid ester, higher aliphatic alcohol, canava wax, and montan wax. These additives must be well dispersed in the binder resin to form satisfactory images.

Since the polyester resin composition of the present invention is well dispersed and dissolved in water or a water affinity solvent and a solvent and a mixed solvent of water, a toner may be prepared by polymerization by dispersing the additives therein after preparing a liquid resin composition. When manufacturing the toner by the method, even when used in the solid resin state of the polyester resin composition of the present invention, since the functional group contains a surfactant function in the molecule, it is possible to prepare the toner having excellent performance by dispersing the additive well.

The toner thus obtained can obtain a toner having an outflow start (Tfb) of 80 to 95 DEG C and a discharge end temperature (Tend) of 120 to 135 DEG C by a rheometer, so that the image formation speed is fast, low temperature fixing is possible, and the off-section resistance is good. It is possible to obtain a clear image and a high quality image.

(2) The polyester composition of the present invention has two to three carboxyl groups at the end of the polymer chain when preparing a powder coating composition using an epoxy resin as a curing agent, so that the reactivity is good and the dispersibility is good. There may also be stability, and the low softening point resin can be cured in a short time of about 10 minutes at 180 ℃ or less, whereby the curing temperature can be lowered to obtain a high-quality coating film excellent in high gloss, heat resistance, anti-corrosiveness, and the like.

(3) In the production of rheology alkyd varnish paints and printing inks, the product obtained by reacting the polyester resin composition of the present invention as a solid resin component with fatty acids and dry oils is well soluble in aliphatic hydrocarbon solvents and aromatic hydrocarbon solvents. A strong coating film with good gloss, water resistance, and weather resistance and a high quality printed screen can be obtained. The polyester composition of the present invention from gravure ink has a good solubility in mixing of ketone solvents and aromatic hydrocarbon solvents, so it is fast-drying, adhesion and abrasion resistance. A printed screen with excellent fastness can be obtained.

(4) When the polyester resin composition of the present invention is used as an adhesive base fixing resin in the manufacture of the adhesive, and the hot melt adhesive is used, it has excellent low softening point, low melt viscosity, adhesion, water resistance, chemical resistance, acceleration, and compatibility. Excellent initial adhesion and strong adhesion can be obtained for paper, boards, leather, textiles, wood, plastics, metals, aluminum and other metals. These adhesives can be dissolved in various solvents and used for the same purpose as the liquid adhesive as the liquid adhesive. Can be.

Although an Example demonstrates in detail, this invention is not limited by this Example.

<Example 1>

Step (1) Into a reactor equipped with a stirrer, a reflux condenser, a separator, a thermometer, and a nitrogen inlet, 400 g of waste PET chips, 200 g of gumzojin, and 0.3 g of tartaric acid catalyst monobutane were heated and heated to 250 ° C. under nitrogen injection. Hold for 2 hours. As the temperature rises, the PET gradually dissolves and begins to stir. After confirming that the contents became transparent, the contents were cooled to 150 ° C. and 12Og of maleic anhydride was added to confirm the timing at which the temperature of the contents completed the heat of the ring-opening reaction. The acid value of the polymerization product is 115 mgKOH / g. Step (2) 200 g of birphenol Aethylene oxide adduct was added thereto, followed by condensation polymerization while dehydration at 250 ° C. for 5 hours. When the acid value reached 55 mgKOH / g, the reaction product was cooled and 50 g of sodium hydroxide and 1500 g of supernatant water were added thereto. After stirring at 30 DEG C for 30 minutes, a water-soluble polyester resin (referred to as resin solution A) was prepared. The product had an acid value of 39 mgKOH / g, a weight average molecular weight of 11,000 softening point of 80 ° C., and PH of 8.5.

Toner was prepared by a polymerization method using the water-soluble polyester resin as a polymerized toner binder. A toner having good physical properties and excellent fixability could be prepared.

100 parts by weight of resin solution A, 3 parts by weight of carbon black, 0.1 parts by weight of charge agent, 1 part by weight of dispersant is mixed, dispersed and suspended to form particles, and the particles obtained by filtration are washed with water and dried to form a toner precipitate. Toner was added by adding 1 part by weight of the toner to fill the printer cartridge, and the printing was performed. As a result of forming the image, a clear image and an image excellent in fixability were obtained.

<Example 2>

400 g of waste PET chip, 200 g of hydrogenated rosin, 0.3 g of monobutane stannate, 150 g of trimellitic anhydride, and 200 g of neopentylglycone were inserted into a reactor and carried out in the same manner as in Example (1). (Referred to as resin solution B.)

The resin acid value of the said water-soluble polyester is 30 mgKOH / g, and a weight average molecular weight is 12,000 softening point of 95 degreeC, and PH 8.7.

Toner was prepared by a polymerization method using the water-soluble polyester resin as a polymerized toner binder. A toner having good physical properties and excellent fixability could be prepared.

100 parts by weight of resin solution B, 3 parts by weight of carbon black, 0.1 parts by weight of charge agent, 1 part by weight of dispersant was mixed, dispersed and suspended to form particles, and the particles obtained by filtration were washed with water, dried to form a toner precipitate, and then to 100 parts by weight of toner composition. Toner was added by adding 1 part by weight of the toner to fill the printer cartridge, and the printing was performed. As a result of forming the image, a clear image and an image excellent in fixability were obtained.

<Example 3>

400 g of waste PET chips, 200 g of rosin esters, 0.3 g of monobutyl stannate, 150 g of fumaric acid, 100 g of neopentyl glycol, and 100 g of diethylene glycol were charged into the reactor, and the same procedure as in Example 1) was carried out. Replaced by. The acid value of the water-soluble polyester resin is 28 mgKOH / g, the weight average molecular weight is 12,000, the softening point is 105 ℃, PH 8.1.

<Example 4>

400g of waste PET chip, 200g of C5 petroleum resin, 0.3g of monobutyl stannate, 150g of ethylene glycol, 100g of ethylene glycol, trimethylolpropane, 80g, was introduced into a reactor, and was carried out in the same manner as in Example 1) and replaced with 50g of ammonium hydroxide as a neutralizing agent. 200 g of butylglycone was used as the water affinity solvent. The acid value of the water-soluble polyester resin is 30 mgKOH / g, the weight average molecular weight is 13,000, the softening point is 108 ℃, PH 7.9.

Example 5

400 g of waste PET chips, 200 g of C9 petroleum resin, 0.3 g of monobutyl tartarate, 50 g of adipic acid, 100 g of baric anhydride, 100 g of propylene glycol, and 100 g of neopentin-glycone were introduced into the reactor, followed by the same method as in Example 1). 30 g of sodium hydroxide and 35 g of triethylamine were used. The acid value of the water-soluble polyester resin was 31 mgKOH / g, and the weight average molecular weight was 13,000, PH 7.7.

<Example 6>

350 g of waste PET chip, 250 g of marinated gumzine, 0.3 g of monobutyl stannate, 100 g of trimellitic anhydride, 50 g of neopentin glycol, and 150 g of bisphenol Aethylene double side adduct were introduced into a reactor and carried out in the same manner as in Example 1. It was.

The acid value of the water-soluble polyester resin is 45mgKOH / g, the weight average molecular weight is 11,500, the softening point is 81 ℃, PH 8.7.

<Example 7>

350 g of waste PET chips, 250 g of dicyclopentadiene resin, 0.3 g of monobutyl stannate, 150 g of maleic anhydride, 100 g of neopentin glycol, and 100 g of polyethylene glycol were introduced into a reactor, and the same procedure as in Example 1 was carried out. 30 g, 50 g triethylamine was replaced. The acid value of the water-soluble polyester resin is 30mgKOH / g, the weight average molecular weight is 12,000, the softening point is 95 ℃, PH 8.1

<Example 8>

400 g of waste PET chip, 200 g of dicyclopentadiene resin, 0.3 g of monobutyl stannate, 100 g of isophthalic acid, 50 g of adipic acid, 70 g of neopentyl glycol, and 120 g of bisphenol Aethylene oxide adduct were added to the reactor and the same method as in Example 1 Although the neutralization and solubilization step of step (3) was omitted, a solid polyester resin was prepared. The acid value of the solid polyester resin is 10mgKOH / g, the weight average molecular weight is 20,000, the softening point is 93 ℃.

Example 9

500 g of waste PET chip, 200 g of gum rosin, 0.3 g of monobutyl stannate, 100 g of maleic anhydride, and 200 g of pentaerythritol were introduced into the reactor and carried out in the same manner as in Example 1, but the neutralization and solubilization steps of step (3) were performed. Omitted to prepare a solid polyester resin. The solid polyester resin has an acid value of 11 mgKOH / g, a weight average molecular weight of 30,000, and a softening point of 145 ° C.

The polyester resin produced from the waste PET according to the present invention is excellent in compatibility and dispersibility with colorants and other additives, has excellent adhesion to the medium, and is capable of neutralization and solubilization. It can be used as a binder of copiers, printers, electrophotographic imaging toners, and a solid resin can be used as a binder of a pulverized toner, and is provided as a fixing resin of printing ink, paint and adhesive. The present invention can be stably manufactured from high value-added materials having environmental friendliness and social value in terms of resource recycling.

Claims (16)

(1) a first depolymerization of (A) polyethylene terephthalate with a solid resin solution, and (B) a second depolymerization and an addition reaction by adding a polybasic acid to the lysate. (2) adding polyhydric alcohol to the product obtained in step (1) to perform a polycondensation reaction to prepare a polymer having a weight average molecular weight of 3,000 to 50,000 and a softening point of 70 to 150 ° C. with an acid value of 10 to 150 mgKOH / g. (3) A polymer having an acid value of 20 mg KOH / g or more in the polymer obtained in step (2) is dissolved in water or a water-soluble solvent and a mixture of water-soluble solvents and water-soluble to prepare a solid resin or neutralize and solubilize it with a basic compound. Since the polyester resin is prepared and the polymer having an acid value of 15 mgKOH / g or less is produced as a solid resin, the outflow start temperature (Tfb) of the polymer by a constant load extruded tubular rheometer is 80 ° C to 105 ° C, and the outflow end temperature (Tend ) Is a method for producing a high value-added polyester resin by recycling waste polyethylene terephthalate, characterized in that 120 ℃ ~ 160 ℃, glass transition agent (Tg) is 40 ℃ ~ 80 ℃. The solid resin of step (1) (A) is gum rosin, wood rosin, deloginate, hydrogenated rosin, marinized rosin, rosin ester, pinene resin, dipentene resin, C5 petroleum resin, C9 series petroleum resin, DCPD resin, hydrogenated DCPD resin, a method of producing a polyester resin composition characterized in that selected from the group The method for producing a polyester polymer according to claim 1, wherein the weight ratio of the polyethylene terephthalate and the solid resin solution in step (1) (A) is 1: 9 to 9: 1. The polybasic acid for addition reaction with depolymerization of step (1) (B) is phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, azeline acid, sebacic acid, tetrahydrophthalic anhydride, maleic anhydride, fumaric acid. , Itaconic acid, trimellitic anhydride, pyromellitic anhydride, a method for producing a polyester resin composition, characterized in that selected from the group of benzoic acid The process for producing a polymer according to claim 1, wherein the polybasic acid of step (1) (B) is added in an amount of 10 to 70% by weight relative to the product of (A). The method according to claim 1, wherein the reaction temperature is carried out at 200 to 250 DEG C using the catalyst for depolymerization and addition reaction and the polycondensation in step (1) in an amount of 0.05 to 0.5% by weight. The polyhydric alcohol of step (2) is ethylene glycol, propylphen glycol, 1.3 propanediol, 1.3 butanediol, 1.6 hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, poly ethylene glycol, bisphenol A Method for producing a polyester resin composition, characterized in that selected from the group of alkylene oxide adducts, trimethylolpropane, glycerin, pentaerythritol The method of producing a polyester according to claim 1, wherein the polyhydric alcohol of step (2) is added in an amount of 10 to 70% by weight based on the depolymerized product of step (1) and has an acid value of 10 to 90 mgKOH / g. The method for preparing a polyester composition according to claim 1, wherein the basic compound for neutralization in step (3) is selected from the group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide, lithium hydroxide, and amines. The neutralizing basic compound according to claim 1 is added in an amount of 3 to 30% by weight based on the acid value of 20 mgKOH / g to l50 mgKOH / g in step (2) to enable a water-soluble polyester resin composition. Polyester resin manufacturing method characterized in that The water affinity solvent used for the product neutralized with a basic compound is alcohol, ether, acetone, diacetone alcohol, dimethyl tolamide, tetrahydro-fu tube, ethyl glycol, propyl glycol, butyl glycol, n-methyl Method for producing a polyester resin composition, characterized in that selected from the group of pyrrolidone The method for producing a water-dispersible polyester according to claim 1, wherein water or a water affinity solvent and a water mixture of the solvent are diluted by adding 1 to 10 times to a product neutralized with a basic compound. According to claim 1, the acid value of 10mgKOH / g ~ 150mgKOH / g of step (2) is a solid resin with a softening point of 70 ~ 150 ℃, the outflow start temperature (Tfb) is 80 ~ 105 ℃, the exit end temperature (Tend) is Process for producing a polyester resin having a temperature of 120 ° C. to 160 ° C. and a glass transition point (Tg) of 40 ° C. to 80 ° C. The method for producing a polyester resin composition according to claim 10, wherein the water-soluble polyester resin composition is suitable for binder resins of inkjet and polymerization process toners. The resin composition for an electrophotographic toner according to claim 13, wherein the solid resin has a low softening point and a low melt viscosity. The resin composition according to claim 13, wherein the solid resin has excellent compatibility and adhesion, and thus, a resin composition for printing ink, paint, and adhesive.