JPH07292221A - Resin composition and its production - Google Patents

Abstract

PURPOSE:To produce a resin compsn. which is not restricted by pot life, excellent in storage stability, and useful for wood processing by premixing an extender, water, and a curative and mixing the resulting liq. premix with a specific resin on a specified apparatus. CONSTITUTION:An extender 7, water 6, and a curative 8 are premixed; the resulting liq. premix is mixed with a water-base resin 1 on a two-component mixing and feeding apparatus 3. Pref. the resin 1 comprises at least one resin selected from the group consisting of an amino, a phenol, an amino-phenol cocondensation resins and a mixture of at least one of these resins with a thermoplastic resin emulsion. The extender pref. comprises at least one powder selected from the group of org. powders consisting of wheat flour, barley flour, rye flour, rice flour, and flying-out flour and the group of inorg. powders consisting of CaCO3, talc, clay, and kaolin. At least one compd. selected from the group consisting of ammonium salts of strong acids (hydrochloric, sulfuric, and nitric acids), inorg. strong acids (hydrochloric, sulfuric, and nitric acids), and org. acids (maleic and sulfamic acids) is used as the curative.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin composition used in a wood-based processing plant. Further, the resin composition relates to a resin composition that is cured without being subject to usable time restrictions. More specifically, the present invention relates to a method for producing a resin composition in which substances that are not involved in curing are mixed with each other and a two-liquid mixing / supplying device is used as the two liquids to improve productivity and economic efficiency.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
Wood adhesives are used as resin compositions based on amino resins or phenolic resins. When using an amino resin or the like for bonding a wood-based adherend, the adhesive physical properties or productivity such as penetrability to the adherend, aging property, and tackiness,
Economical properties are required, and the filler and the curing agent are blended in consideration of them. These additive substances are required to be weighed and prepared, and the resin composition is manually obtained. The obtained resin composition is subject to a time constraint (usable time) that the resin composition can be used due to the effect of the curing agent added from the viewpoint of productivity and adhesiveness. There is no choice but to frequently prepare a resin composition in an amount that can be digested with.

Recently, non-amino one-component adhesives that do not require human labor have been developed, but all of them are expensive and economically disadvantageous as an adhesive for wood. Therefore, these adhesives are used only for limited applications with high added value. Against this background, the object of the present invention is to provide a resin composition which is based on an amino resin, which is used in a large amount as a general-purpose adhesive, and which has a reduced number of man-hours and is not restricted by the pot life. The purpose is to use a liquid mixing and supplying device.

[0004]

In order to solve these problems, the inventors of the present invention made one solution a water-based resin, and the other was added with an extender, water and a curing agent, and mixed well as one solution. By setting these to a specific ratio using a two-liquid mixing and supplying device, and automatically supplying them according to the amount used, the man-hours can be reduced without being restricted by the pot life, and the economy of amino resins etc. It is intended to provide a resin composition that maintains the property and a method for producing the same. That is, an extender, water, and a curing agent are mixed in advance to form a liquid, and a resin composition obtained by mixing the obtained mixture and an aqueous resin with a two-liquid mixing and feeding device, or a mixture of an extender, water, and a curing agent in advance, The present invention relates to a method for producing a resin composition, which is in a liquid state, and the obtained mixture and an aqueous resin are mixed using a two-liquid mixing / supplying device.

The present invention will be described in detail below. The water-based resin used in the present invention is one in which the water-based resin is an amino resin, a phenol resin, or an amino-phenol co-condensation resin as an essential component, and a thermoplastic resin emulsion may be added to the water-based resin as necessary. It means a mixture.

The amino resin means an aqueous solution or water dispersion of a compound having an amino group such as urea and melamine, formaldehyde and a co-condensation resin, and the phenol resin means an aqueous solution or water dispersion of a phenol, formaldehyde and a condensation resin. Say the liquid. Further, as the thermoplastic resin emulsion which is optionally mixed with an amino resin or the like in order to impart various properties, a vinyl acetate resin, an ethylene-vinyl acetate resin copolymer resin, a polymer resin of an acrylic monomer,
An aqueous dispersion of a copolymer resin of an acrylic monomer and vinyl acetate, or a copolymer resin of a vinyl monomer such as styrene and methyl methacrylate and a diene such as butadiene can be used.

The extenders used in the present invention include flour,
Organic substances such as barley flour, rye flour, and rice flour, and inorganic substances such as calcium carbonate, talc, clay, and kaolin do not hinder the use of one or more, and can be used as one kind or as a mixture of two or more kinds. It is preferable that the agent does not change into abnormal properties with time when mixed with water or a curing agent described later.

The amount of extender and water added to the water-based resin is
10 to 300 parts is preferable for 100 parts of the water-based resin,
More preferably, 20 to 200 parts is suitable. If it is less than 10 parts, an appropriate viscosity cannot be obtained, the permeation of the adherend becomes large, and the adhesion failure is induced, which is not preferable. On the other hand, if it exceeds 300 parts, the amount of the effective component of the water-based resin per bonded area becomes small, and the desired adhesive strength cannot be maintained, which is not preferable. The amount of water added is determined by the water-solubility of the extender for obtaining an appropriate viscosity, that is, the viscosity. Therefore, since it depends on the manufacturer, the type of flour, the lot, etc., it is not possible to regulate water unconditionally, but the total amount of flour and water is required to have an appropriate viscosity.

The viscosity suitable for adhering adherends is 5 to
500 poise is suitable, and the viscosity of the mixture may be adjusted to maintain this viscosity range. The same applies to the case of using an inorganic extender, and a viscosity suitable for adhering the adherend is 5 to 500 poises. If the viscosity of the mixture is adjusted so that this viscosity range can be maintained. I have nothing to do with it.

Next, as a curing agent, ammonium chloride,
One or a mixture of two or more of strong acid ammonium salts such as ammonium sulfate and ammonium nitrate, strong inorganic acids such as hydrochloric acid, sulfuric acid and nitric acid, and organic acids such as maleic acid and sulfamic acid is used.

In the case of a strong acid ammonium salt, the amount of the curing agent added is preferably 0.1 to 10 parts, more preferably 0.3 to 5 parts, and most preferably 0.5 to 100 parts with respect to 100 parts of the aqueous resin. 3 parts is preferred. If the amount is less than 0.1 part, the effect as a curing agent cannot be obtained, and the curing speed is slow, so that the productivity is lowered or the development of the adhesive force is delayed. Further, if the amount exceeds 10 parts, the curing speed will be remarkably increased, and therefore the digestion and use time of the compounded glue solution will be significantly restricted, and the pre-curing, that is, the adhesive will be cured before the adherend is molded, and It is not preferable because the function as an agent cannot be exerted and the adhesion becomes poor. Further, in the case of strong inorganic acids or organic acids, 0.01 to 3 parts is preferable, and more preferably 0.03 to 1 part is preferable with respect to 100 parts of the water-based resin.
If it is less than 0.01 part or more than 3 parts, it is not preferable for the same reason as described above. The inorganic strong acid or organic acid is 1
It is preferable to use it after diluting it to 50% by weight. Also,
If no curing agent is needed, it need not be added.

The mixture used in the present invention is obtained by premixing the extender, water and the curing agent. The mixture is first added to a stirrable mixing tank with a fixed amount of water, and with stirring, a fixed amount of a bulking agent and well stirred. After sufficiently stirring, the curing agent is added in an amount suitable for the water-based resin, and the stirring is continued.

It is possible to continuously supply each of the extender, water and curing agent, and to carry out continuously, but it is preferable to prepare two mixing tanks or a plurality of mixing tanks so that they can be used alternately. It can be supplied continuously and is economical. The viscosity of the mixture of the extender, water, and the curing agent must be a viscosity that can be supplied by the metering pump used in the present invention, and at the same time, an appropriate viscosity when mixed with the water-based resin.
In this way, the mixture of the extender, water, and the curing agent and the water-based resin, which have been mixed in advance in this way, are supplied to the two-liquid mixing and supplying device through separate quantitative supply pumps to obtain a resin composition.

FIG. 1 shows a method for producing a resin composition by using a two-liquid mixing / supplying device of a premixed mixture and an aqueous resin.
I will explain. Water-based resin is water-based resin service tank 1
Is directly supplied to the two-liquid mixing and supplying device 3 by using the constant amount supply pump 2. It is more preferable that the water-based resin service tank 1 is equipped with a level meter so that the water-based resin starts to be fed at the lower limit and stopped at the upper limit. In some cases, the water-based resin may be directly supplied from the product tank or container to the two-liquid mixing / supplying device 3.

The mixture used in the present invention is obtained by premixing the extender, water and the curing agent. The mixture is first added to a mixing tank 5 equipped with a stirrer 4 with a fixed amount of water 6, and with stirring, a fixed amount of an extender 7 and well stirred. After sufficiently stirring, a curing agent 8 commensurate with the water-based resin is added and stirring is continued.

It is possible to continuously mix the extender 7, the water 6 and the hardening agent 8 continuously, but preferably the mixing tank 5 is 2 times.
It is economical to provide a base or a plurality of bases, mix them, and use them alternately and continuously. These mixtures are used in the metering pump 9
Is supplied to the two-liquid mixing and supplying device 3. In the present invention, the fixed amount supply pumps 2, 9 are mixed with the water-based resin in advance.
Is used to supply the two-liquid mixing and supplying device 3, and the mixture is instantaneously mixed and continuously or intermittently supplied.

Two-liquid mixing / supplying device 3 used in the present invention
Is a vertical type mixer having a bladed stirring shaft and a mechanism having a specific residence time, or a static mixer containing a packing for generating a mixed flow. The specific residence time means that the composition is supplied to the two-liquid mixing / supplying device 3,
The residence time during mixing and storage, which is determined by the capacity of the two-liquid mixing and feeding device 3 and the feed rate of the composition, that is, the discharge rate to the gluing machine. The capacity of the two-liquid mixing / supplying device 3 is at a minimum, as long as the composition held in the sizing machine can be supplied, but the discharge amount per minute is usually 0.1 to 10
About twice is preferable. If it is less than 0.1 times, the volume of the water-based resin used in the present invention is insufficient, and if it exceeds 10 times, not only the water-based resin and the mixture are not sufficiently mixed, but also the pot life is exceeded and a large amount is wasted when trouble occurs. However, the effect of the present invention cannot be expected.

The mixed composition is supplied from the two-liquid mixing / supplying device 3 to the gluing machine. Since the composition supplied to the sizing machine decreases as it is consumed, a sensor that detects the upper limit position and a sensor that detects the lower limit position of the resin composition on the sizing machine are installed, and the resin composition amount is at the lower limit position. If the fixed amount supply pumps 2 and 9 are operated when the amount reaches the upper limit and the fixed amount supply pumps 2 and 9 are stopped when the amount of the resin composition reaches the upper limit position, the gluing machine can be operated more effectively and continuously. It becomes possible to do.

Two-liquid mixing / supplying device 3 for mixing the water-based resin 1 and the mixture
The metering pumps 2 and 9 are used in order to accurately supply the same. A gear pump, a mono pump, a plunger pump, or the like is used as the constant amount supply pumps 2 and 9. In each of these fixed amount supply pumps 2 and 9, the mixing ratio of the water-based resin and the mixture may be changed, so that it is preferable to adjust the rotation speed of the motor that operates the pump by an inverter method, for example.

The resin composition thus obtained is used for bonding plywood, decorative plywood, etc., and its pot life is remarkably improved as compared with the conventional method, and the adherend is thermoformed. Can withstand a long time. Further, it brings great advantages in stabilizing the coating amount, productivity and adhesive properties.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. Example 1 A urea resin (Euroid 701 manufactured by Mitsui Toatsu Chemicals, Inc.) was used as the water-based resin. Separately, 125 parts of red flowers (flour) of Nisshin Seifun Co., Ltd. as an extender and 5 parts of ammonium chloride powder as a hardening agent were mixed and stirred in 100 parts of water to obtain a mixture having a viscosity of 80 poises. The urea resin and the mixture were mixed at 100: 4 with the respective metering pumps 2 and 9.
8 kg / min of the mixed resin composition fed to the two-liquid mixing / supplying device 3 (static mixer type) at a ratio of 5
At the same time as the production of plywood, the resin composition was sampled every hour from the start of operation and the change in viscosity was measured. The results are shown in Table 1. As a result, the viscosity did not change even after 5 hours from the start of the operation. In addition, as a result of measuring the coating amount when manufacturing plywood (3 mm plywood),
It was 280 to 300 g / m ² (double-sided coating), which was very stable.

Example 2 A melamine resin (Euroid 350 manufactured by Mitsui Toatsu Chemicals, Inc.) was used as an aqueous resin. Separately, 100 water
A mixture of 75 parts of red flowers of Nisshin Seifun (wheat flour) as an extender and 5 parts of ammonium chloride powder as a hardening agent was mixed and stirred to obtain a mixture having a viscosity of 80 poise. The melamine resin and the mixture were mixed with the respective metering pumps 2, 9 at 100:
At a ratio of 35, the resin composition sent to and mixed with the two-liquid mixing / supplying device 3 (static mixer type) was 8 kg / mi.
The discharge amount of n was set, and at the same time when the plywood was manufactured, the resin composition was sampled every hour from the start of operation, and the change in viscosity was measured, and the results are shown in Table 1. As a result, the viscosity did not change even after 5 hours from the start of the operation. Further, when the plywood was manufactured (3 mm plywood), the coating amount was measured, and the result was 300 to 320 g / m ² (double-sided coating), which was very stable.

Example 3 A melamine-phenol co-condensation resin (Euroid 883 manufactured by Mitsui Toatsu Chemicals, Inc.) was used as an aqueous resin. Water 1
Barley flour as an extender to 00 parts (Matsuo Seimugi Co., Ltd. barley flour)
After adding 50 parts, 50 parts of rye flour (rye of Matsuo Seimu Co., Ltd.) and 50 parts of calcium carbonate and stirring for 10 minutes, 10 parts of ammonium chloride was added and further stirred for 5 minutes to obtain a mixture of 100 poise. The phenol-melamine co-condensed resin adhesive and the mixture were sent to the two-part mixing and supplying device 3 (static mixer type) at a ratio of 100: 25 by the constant-quantity supplying pumps 2 and 9, respectively, and the mixed resin composition was used.
The discharge rate is set to kg / min, plywood is manufactured, and at the same time, the resin composition is sampled every hour from the start of operation,
The change in viscosity was measured and the results are shown in Table 1. as a result,
The viscosity did not change even after 5 hours from the start of the operation. When manufacturing plywood (5 ply, 12 mm plywood),
As a result of measuring the coating amount, 380 to 400 g / m
² (coated on both sides) was very stable.

Example 4 As the water-based resin, a melamine resin-vinyl acetate resin (melamine resin C-1 manufactured by Mitsui Toatsu Chemicals Inc., vinyl acetate resin Konishi CH70T) was used in a ratio of 4: 6. To 100 parts of water, 75 parts of wheat flour (red button manufactured by Nisshin Seifun Co., Ltd.), 50 parts of calcium carbonate and 10 parts of ammonium chloride were added as an extender and stirred for 10 minutes to obtain a mixture of 400 poises. The urea-vinyl acetate resin and the mixture were sent to the two-liquid mixing / supplying device 3 (static mixer type) at a ratio of 100: 50 in a constant amount supply 2 and 9 respectively, and the mixed resin composition was discharged at 2 kg / min. The amount of the resin composition was set, and at the same time when the decorative plywood was manufactured, the resin composition was sampled every hour from the start of operation, and the viscosity change was measured, and the results are shown in Table 1. As a result, the viscosity did not change even after 5 hours from the start of the operation. Further, when the decorative plywood was manufactured (12 mm plywood and 0.3 mm zelkova board), the coating amount was measured, and the result was 130 to 140 g / m ² (single-sided coating), which was very stable.

Example 5 The procedure of Example 4 was repeated, except that the vinyl acetate resin of Example 4 was changed to ethylene vinyl acetate resin (Kuraray OM-28, Inc.). As a result, the viscosity did not change even after 5 hours from the start of the operation. Also, manufacture of decorative plywood (12
When 0.3 mm zelkova plate on mm plywood was used, the coating amount was measured, and the result was 120 to 130 g / m ² (single-sided coating), which was very stable.

Example 6 Urea resin-styrene-butadiene modified resin (C-3, SB-102 manufactured by Mitsui Toatsu Chemicals, Inc.) as an aqueous resin
1) was used in a ratio of 3: 7. To 100 parts of water were added 100 parts of wheat flour (red button manufactured by Nisshin Seifun Co., Ltd.), 70 parts of talc and 10 parts of ammonium chloride, and the mixture was stirred for 10 minutes to obtain a mixture of 400 poise. The urea-vinyl acetate resin and the mixture were metered at 100 and 100: 2 and 9 respectively:
At a ratio of 50, the mixed resin composition fed to the two-liquid mixing / supplying device 3 (static mixer type) was mixed at 2 kg / mi.
Set the discharge amount to n and manufacture the decorative plywood,
The resin composition was sampled every hour after the start of operation, and the change in viscosity was measured. The results are shown in Table 1. As a result, the viscosity did not change even after 5 hours from the start of the operation. In addition, as a result of measuring the coating amount when manufacturing a decorative plywood (12 mm plywood and 0.3 mm zelkova wood board), 130 to 1
It was 40 g / m ² (one side coating), which was very stable.

Example 7 Urea-melamine co-condensation resin-styrene-butadiene modified resin (C-manufactured by Mitsui Toatsu Chemical Co., Ltd.) as an aqueous resin
1, SB-1123) was used at a ratio of 4: 6. Water 10
Wheat flour as a bulking agent (Nisshin Seifun Co., Ltd. red button)
100 parts and 10 parts of ammonium chloride were added and stirred for 10 minutes to obtain a mixture of 400 poise. The urea-vinyl acetate resin and the mixture were metered at 100 and 100: 2 and 9 respectively:
At a ratio of 50, the mixed resin composition fed to the two-liquid mixing / supplying device 3 (static mixer type) was mixed at 2 kg / mi.
Set the discharge amount to n and manufacture the decorative plywood,
The resin composition was sampled every hour after the start of operation, and the change in viscosity was measured. The results are shown in Table 1. As a result, the viscosity did not change even after 5 hours from the start of the operation. In addition, as a result of measuring the coating amount when manufacturing a decorative plywood (12 mm plywood and 0.3 mm zelkova wood board), 130 to 1
It was 40 g / m ² (one side coating), which was very stable.

Example 8 Example 8 was repeated except that the styrene-butadiene modified resin of Example 7 was changed to a copolymer resin of a vinyl compound and a diene compound (Polylac 707 manufactured by Mitsui Toatsu Chemicals, Inc.). It was As a result, the viscosity did not change even after 5 hours from the start of the operation. Also, manufacture of decorative plywood (12 mm
When the plywood had a 0.3 mm key board and the coating amount was measured, the result was 120 to 130 g / m ² (single-sided coating), which was very stable.

Comparative Examples 1 to 3 The water-based resin of Example 1, 2 or 4 and the mixture were stirred and mixed using a turbine type stirrer, and then the change in viscosity per hour was measured at 25 and 35 ° C. The measurement results are shown in Table 1.
As a result, the viscosity changed significantly with stirring and mixing, and was more than twice the initial viscosity at 25 ° C and 5 at 35 ° C.
It was more than doubled and even solidified to make it difficult to use. As a result of producing each plywood using these resin compositions in the same manner as in Example 1, 2 or 4, the viscosity change was large, and as a result, the coating amount varied and it was necessary to adjust each time.

[0030]

[Table 1]

[0031]

INDUSTRIAL APPLICABILITY The present invention is a simple method in which an extender to be blended with an aqueous resin, water and a curing agent are mixed in advance, and then the aqueous resin and the mixture are mixed at an arbitrary ratio in a two-liquid mixing and feeding device. is there. As a result, without being subject to usable time constraints (pot life, viscosity change) of the obtained resin composition,
It can be used stably for a long time, which greatly contributes to the stabilization of quality. That is, in the comparative example prepared by the compounding composition including the curing agent in the water-based resin, the obtained resin composition is subject to the time constraint, but the examples of the present invention always maintain a constant viscosity. Therefore, the coating amount in the gluing machine is stabilized, and the quality can be expected to improve.

[0032]

[Brief description of drawings]

FIG. 1 is a process diagram of manufacturing a resin composition used in the present invention.

[Explanation of symbols]

 1 Water-based resin service tank 2 Fixed amount supply pump 3 Two-liquid mixing and supply device 4 Stirrer 5 Mixing tank 6 Water 7 Expander 8 Curing agent 9 Fixed amount supply pump 10 Stirrer 11 Resin composition 12 Gluing machine

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location C09J 161/34 JEY (72) Inventor Nobuhiko Koto 7-1, 1-1 Hikoshimasako-cho, Shimonoseki-shi, Yamaguchi Prefecture Mitsui Toatsu Chemical Co., Ltd.

Claims (6)

[Claims] 1. A resin composition obtained by previously mixing an extender, water, and a curing agent to form a liquid, and mixing the obtained mixture and an aqueous resin in a two-liquid mixing / supplying device. 2. The water-based resin is any one of an amino resin, a phenol resin, and an amino-phenol resin co-condensation resin.
The resin composition according to claim 1, which is a mixture of two or more kinds, or a mixture of the resin and a thermoplastic resin emulsion. 3. The bulking agent is wheat flour, barley flour, rye flour,
The resin composition according to claim 1, which is one or a mixture of two or more of organic substances such as rice flour or flying powder, inorganic substances such as calcium carbonate, talc, clay or kaolin. 4. The curing agent is one or a mixture of two or more of strong ammonium chloride salts of ammonium chloride, ammonium sulfate or ammonium nitrate, strong inorganic acids of hydrochloric acid, sulfuric acid or nitric acid, and organic acids of maleic acid or sulfamic acid. The resin composition according to 1. 5. The thermoplastic resin emulsion is one or a mixture of two or more of vinyl acetate resin emulsion, ethylene vinyl acetate resin, acrylic resin emulsion, acrylic vinyl acetate resin emulsion, and copolymer resin emulsion of vinyl compound and diene compound. Claim 2 which is
The resin composition described. 6. A method for producing a resin composition, which comprises mixing an extender, water and a curing agent in advance to form a liquid, and mixing the resulting mixture with an aqueous resin using a two-liquid mixing / supplying device.