KR100942301B1 - Laminating method and products made thereby - Google Patents

Abstract

PURPOSE: A method for laminating pulp or paper with biodegradable resin is provided to reduce environmental load, and to reduce damages due to environmental hormone and dioxin in combustion and waste of the paper or the pulp. CONSTITUTION: A method for laminating pulp or paper with biodegradable resin comprises the following steps: preparing a material which is manufactured by blending PLA materials 30 weight% ~ 40 weight%, aliphatic family biodegradable materials 50 weight% ~ 60 weight%, PLA 12 weight% ~ 20 weight% and muscovite 65 weight% ~ 73 weight%; extruding the material in 170°C ~ 200°C; extruding a pelletized aliphatic family biodegradable resin; and preheating the paper and the pulp.

Description

Laminating biodegradable resin on paper or pulp. {LAMINATING METHOD AND PRODUCTS MADE THEREBY}

The present invention relates to a paper coating and manufacturing method using an aliphatic polyester composition, and more particularly, to add a biodegradable nano-composite resin (Patent No. 10-0655914) to produce a laminated film and through the laminated product The present invention relates to a method of laminating a biodegradable resin on paper or pulp to maximize the biodegradability efficiency and increase the completeness of the product.

In general, products such as paper cups, cup noodle and ice cream containers, disposable flowerpots, milk cartons, packaging cases, wallpaper interior sheets are used by coating a laminate film on the paper or pulp material.

Conventional laminate film mainly uses PP or PE. When laminated products are discarded, natural paper or pulp is decomposed, but coated laminate film is non-degradable synthetic resin, so it does not decompose after about 20 years. It also acts as a dysfunction that interferes with the decomposition of paper and pulp.

As a result, regulations on the use of disposable products are being tightened in many countries in the world and in the world to minimize environmental load.

In order to overcome such international regulations, Korea is trying to obtain a product that is laminated with a biodegradable material that decomposes within 180 days under composting conditions (60 ° C temperature, 80% humidity-activated microorganism).

By these efforts, the environmental protection and greenhouse gas reduction effect can be broadly achieved, and the economic benefits from the expansion of exports and the exemption of waste charges can be achieved through the substitution of food containers.

Conventional biodegradable resins for the manufacture of laminate films were coated on paper or pulp using PLA (Poly Lactic Acid), PBS, PBA, PBSA materials. However, PLA is brittle and easily releases from paper. Laminated paper is used for forming cups or finished products and bonding them to both sides and bottom. There is a problem that popping phenomenon occurs.

In addition, PBS, PBA, and PBSA may be used as a biodegradable resin for producing a laminate film, which is well laminated on paper or pulp, but when the cup or finished product is formed and both sides and the bottom are thermally bonded and ultrasonically bonded, the adhesive surface is similar to the PLA material. Poor or mold release causes a lot of defects.

In addition, PLA (175 ℃) material with a high melting point and PBS, PBSA, PBA (90 ℃ ~ 120 ℃) material of low melting point, even if the branding and the selected material selected from PLA material, PBS, PBSA, PBA material 1 It is difficult to use due to incompatibility due to material and molecular structure, and there is a problem in that physical properties of sharply degraded when used as a strong alkali-based filler such as Talk, CaCo3, and TiO2.

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The present invention has been made in order to solve the conventional problems as described above, the object is,

Biodegradable paper with excellent lamination on paper and pulp by using biodegradable nano-composite resin with excellent compatibility in molecular structure with PLA material selected from aliphatic polyester resin, PBS, PBSA, and PBA material And preparing pulp and forming and laminating the finished biodegradable material using laminated paper and pulp. The selected material among PLA, PBS, PBSA, and PBA and the biodegradable nanocomposite resin are branded with paper and pulp. Biodegradability with no releasing or bursting of adhesive surface at the time of thermal adhesion of the selected material among PBS, PBSA and PBA above the melting point (90 ℃ ~ 120 ℃) at PLA or below 175 ℃ It is to provide a method of laminating the resin to paper or pulp.

In addition, the present invention, PLA and biodegradable nanocomposite composition when laminating on paper and pulp using the composition plays a role of thermal stability and the selected material of PBS, PBA, PBSA is at the melting point (90 ℃ ~ 120 ℃) or more Laminating allows the biodegradable material, which is selected from PBS, PBA, PBSA, to flow between the particles of paper and pulp, and the biodegradable material laminated to the paper and pulp, and the adhesive is excellent without being released. To provide a way.

The present invention for achieving the above object is a PLA (175 ℃) material having a high melting point and PBS, PBSA, PBA material selected from the 90 ℃ ~ 120 ℃ melting point, and a patent application has been registered and registered (patent Registration No. 10-065591) The composition of biodegradable nanocomposite resin using mucovite is used for weak acidity and neutral series that have excellent compatibility in molecular structure and can play a role of thermal stability during thermal bonding.

In addition, pre-heat the paper and pulp during lamination by extrusion T-die method, but preheat to paper and pulp at the same temperature as 90 ℃ ~ 120 ℃, which is melting point in aliphatic polyester resin selected from PBS, PBA, PBSA. Two of the laminated biodegradable resin compositions were selected from PBS, PBA, PBSA, which had a lower melting point (90 ° C to 120 ° C) before the PLA resin passing between the cooling processing rolls showed Brittle characteristics due to the cooling processing rolls. Allow resin to flow between paper and pulp particles.

Weak acid and neutral biodegradable nanocomposite resins used as fillers can be used to ensure heat stabilizer effect and compatibility by using mica powder with particle size of 40㎛ ~ 0.1㎛.

In addition, even if the laminating thickness is laminated from 0.015mm to 0.07mm, the shape retention and crystallization structure due to the thermal properties due to the PLA characteristics is excellent in maintaining the shape than the PP or PE laminated paper and pulp used previously.

Paper basis weight in paper pulp can be laminated from 50g to 500g. The paper and pulp contact roll is made of urethane and silicon roll and the temperature of the roll is 40 ℃ ~ 50 ℃ for laminating using the extrusion method.The preheated paper and pulp (90 ℃ ~ 120 ℃) is not quenched. The rolls in contact with the biodegradable resin are laminated with a steel roll at a temperature of 25 ° C to 30 ° C.

When molding and finished products are adhered to laminated materials on paper and pulp, the temperature conditions should be 100 ℃ ~ 120 ℃ when direct contact with hot wire.

The present invention has the advantage that the adhesive surface is not released or burst at all when coating the laminated material on the paper and pulp.

 In addition, the present invention, when laminating on paper and pulp, PLA and biodegradable nanocomposite composition plays a role of thermal stability and the selected material of PBS, PBA, PBSA is laminating at a melting point (90 ℃ ~ 120 ℃) or more As a result, a material selected from PBS, PBA, and PBSA flows between the particles of paper and pulp, and has excellent adhesive strength without being released from the biodegradable material laminated on paper and pulp.

In addition, the present invention has a natural friendly advantage that can be degraded during disposal to reduce the environmental load, and damage caused by environmental hormones and dioxins during combustion and disposal.

The laminate film composition of the present invention, 30% to 40% by weight of PLA material, PBS, PBA, PBSA, selected from the selected aliphatic biodegradable material 50% to 60% biodegradable nanocomposite resin 10% to 20% by weight By extrusion at 170 ℃ ~ 200 ℃. At this time, the composition of the biodegradable nanocomposite resin is the content of palm oil in natural oil 10% to 17% by weight PLA content of 12% to 20% by weight particle size 40㎛ ~ 0.1㎛ of the weight of the mica in 65 Weight percent to 73 weight percent.

The method of laminating the laminated film composition on paper and pulp is 30% to 40% by weight of PLA material, 50% to 60% biodegradable nanocomposite material selected from PBS, PBA, and PBSA. Branding by weight to 20% by weight to extrude pelletized at 170 ℃ to 200 ℃;

Extruding the aliphatic biodegradable resin pelletized by the composition by a T-die method;

Preheating the paper and pulp;

Laminating aliphatic biodegradable resins on paper and pulp; Is made of.

Hereinafter, the configuration and laminating step of the present invention will be described in detail with reference to the drawings.

Laminate film composition for laminating aliphatic biodegradable resin on paper and pulp according to the present invention is 30% to 40% by weight of PLA material, 50% to 60% by weight of biodegradable material selected from PBS, PBA, PBSA 10% by weight to 20% by weight of the composite resin.

Extruded at 170 ℃ ~ 200 ℃ melting point of PLA to form the material, and then pelletized and produced by laminating on paper and pulp by the T-die method.

As a result of the content test of aliphatic biodegradable resin composition for laminating on paper and pulp, when PLA content is less than 30%, the selected material from among PBS, PBA, and PBSA may adhere to the steel roll when laminating the paper and pulp. If the PLA material is more than 40% by weight, even if it is laminated on paper and pulp, due to the characteristics due to the brittle crystallization structure of the PLA material, it may be released from paper and pulp, and less than 50% of the selected materials among PBS, PBA, and PBSA It was confirmed that the selected material among PBS, PBA, and PBSA could not be completely adhered or flowed out between the paper and pulp particles, and could be released, and if it was 60% or more, it could be attached to the steel roll.

If the content of biodegradable nanocomposite resin is less than 10% by weight, the compatibility is reduced when compounding with PLA or PBS, PBA, or PBSA selected material. The resin is separated and the physical properties are sharply lowered, and if it is 20% or more, it is difficult to realize the laminating thickness to 0.015 mm in paper and pulp. However, thermal stability was found to increase during thermal lamination.

When laminating in T-die method, screw temperature is 170 ℃ ~ 190 ℃ and T die temperature is controlled by 190 ℃ ~ 210 ℃.

In addition, if the T-die temperature is lower than 190 ° C. for laminating with paper and pulp, the amount of the compounded aliphatic biodegradable resin flowing between the paper and pulp particles is small or the paper is not sufficiently formed. Due to the nature of the resin, the toughness and viscosity are sharply reduced, making the laminating work difficult, and the elongation is decreased in the longitudinal direction, which may cause partial thickness variation.

The paper and pulp are preheated to 90 ° C. to 120 ° C. before passing between the rubber rolls and steel rolls so that the aliphatic biodegradable resins and the laminating laminates are well formed. When the aliphatic biodegradable resin is laminated on the paper and pulp preheated to the temperature, it can be seen that the laminating state shows a very good state as in Comparative Example 1.

(Comparative Example 1)-Photo showing laminating state by separating laminating paper (good lamination when separating film and paper)

At this time, if the preheating temperature of paper and pulp is less than 90 ° C, lamination lamination is weakened between the selected material of PLA, PBS, PBA, and PBSA as in Comparative Example 2, or PBS and PBA among the materials that are compounded between paper and pulp particles. In addition, the PLA material may undergo some crystallization structure and release with paper and pulp before the selected material in PBSA flows. If the temperature is above 120 ° C, laminating lamination is excellent but aliphatic biodegradable resin may adhere to the steel roll.

(Comparative Example 2)-Photograph showing the laminated aliphatic biodegradable resin separated from paper or pulp.

Comparative Example 3 is a photograph showing the comparison of lamination of aliphatic biodegradable resin on paper and pulp preheated to 90 ° C. or lower and paper and pulp preheated to 90 ° C. to 120 ° C., and preheated to 90 ° C. to 120 ° C. The lamination of aliphatic biodegradable resins on paper and pulp showed that the efficiency was very good. That is, it is a photograph combined so that the photograph of the comparative example 1 and the comparative example 2 can be confirmed at a glance.

(Comparative Example 3) (Left Comparative Example 1, Right Comparative Example 2)

On the other hand, when aliphatic biodegradable resin is extruded out of paper or pulp material preheated at 90 ℃ ~ 120 ℃ and T-die temperature is 190 ℃ ~ 210 ℃, it is compressed by rubber roll made of urethane or silicone and steel roll, and the thickness of aliphatic biodegradable resin Adjust the thickness by adjusting the extrusion speed to 0.015mm ~ 0.07mm.

At this time, the rubber roll composed of urethane and silicone is a paper closing portion, wherein the temperature of the rubber roll is 40 ℃ ~ 50 ℃ and the temperature of the steel roll is 25 ℃ ~ 30 ℃.

If the temperature of the rubber roll is less than 40 ℃, when the preheated paper and pulp temperature (90 ℃ ~ 120 ℃) is quenched, the aliphatic biodegradable resin will not be smoothly laminated with paper and pulp, and the PLA material among the compounded aliphatic biodegradable resin Brittle properties can make the laminating paper difficult, and if the rubber roll temperature is 50 ℃ or more may interfere with the cooling rate may cause the resin of the steel roll to stick. The compounded aliphatic biodegradable resin is closed on a steel roll and the steel roll temperature is 25 ° C to 30 ° C.

If the steel roll temperature is less than 25 ℃, the PLA material of the compounded aliphatic biodegradable resin is Brittle, which makes the laminating lamination difficult.If it is over 30 ℃, the laminating lamination is good but the preheated paper and pulp temperature is 90 ℃ ~ 120 ℃ and rubber roll. Compounded aliphatic biodegradable resin extruded from T-die at a temperature of 50 ° C 190 ° C to 210 ° C is laminated on paper or pulp and aliphatic biodegradable resin that has passed through a rubber roll and steel roll Glass transition temperature of PLA resin should be around 55 ℃ to ensure good quality, but if it is over 30 ℃, it can stick to steel roll.

At this time, the temperature condition of the laminating lamination can be controlled by the thickness and the extrusion rate.

Paper, pulp, aliphatic biodegradable resin, and laminated materials are heat-bonded after cutting and cutting, depending on the shape of the cup or container.

At this time, the temperature during molding and heat bonding to the material laminated with aliphatic biodegradable resin on paper or pulp is 100 ℃ ~ 120 ℃ when the heating wire is directly closed. If the heating wire temperature is less than 100 ℃, the selected material among PBS, PBA, and PBSA of the compounded aliphatic biodegradable resin is below melting point, and the adhesion is weak. If the temperature is above 120 ℃, PLA is less than melting point. However, the selected material among PBS, PBA, and PBSA has a melting point or higher, and the resin of the hot wire may adhere.

Claims (8)

30% to 40% by weight of the PLA material, 50% to 60% by weight of an aliphatic biodegradable material selected from PBS, PBA, and PBSA; Biodegradation consisting of palm oil content of 10% to 17% by weight, PLA content of 12% to 20% by weight, particle size of 40㎛ to 0.1㎛, and biomass of 65% to 73% by weight 10% to 20% by weight of the nanocomposite resin is branded and extruded and pelletized at 170 ° C to 200 ° C, The aliphatic biodegradable resin pelletized by the composition and the paper or pulp material preheated to 90 ° C. to 120 ° C. are extruded with a TDIE of 190 ° C. to 210 ° C., and the paper and pulp are made of a rubber roll having a temperature of 40 ° C. to 50 ° C. , The biodegradable resin is in contact with a steel roll at a temperature of 25 ℃ ~ 30 ℃ while the biodegradable resin is laminated on paper and pulp so that the thickness of the biodegradable resin is 0.015mm ~ 0.07mm paper or How to Laminate on Pulp. delete delete delete delete delete delete delete