KR0149187B1 - Worship disk made from polymer - Google Patents

Abstract

The present invention relates to a pulp made by molding a polymer resin composition filled with wood powder. Conventionally filed is produced by processing the wood bar, it takes a lot of manufacturing time according to the hand, there is a problem that can not prevent the degradation of the crack and impact resistance due to the use of the material, above all due to the depletion of the wood There was a difficulty in purchasing the material.

The present invention is made for the purpose of solving the above problems with the conventional instrument of the present invention, and a new method for preparing a resin composition filled with wood powder and injection molding it into a filed mold is presented.

The composition of the present invention to prepare a thermosetting resin composition containing an additive such as 30-40% by weight of thermosetting polymer resin and 50-70% by weight of wood powder and liquid butadiene rubber, thixotropic, wetting agent, and peroxide curing agent, It is a filing made by injecting and molding and then post-processing.

As suggested above, filing made by mixing and molding wood powder in a polymer resin has superior physical properties such as processability, boiling water resistance, impact resistance, and crack resistance compared to filings made of solid wood, and is different in texture and texture. There is no difference, it can significantly reduce the time and cost of manufacturing, and solve the problem of the lack of wood resources caused by making woodwork.

Description

A pulp made by molding wood flour filled polymer composition

The present invention relates to a puddle produced by extrusion molding a polymer resin composition filled with wood powder in a thermosetting resin.

Traditionally, ceremonial filings have used wood, which is made by processing wood and painting lacquer or cashews on its surface.

Ceremonial wood is generally made of solid wood such as oak, boxwood, and ash, and is manufactured in various ways such as plates, water baths, wine glasses, and candle holders.

The filings made using these materials have the advantage that the texture of the logs is fully exhibited, but the manufacturing process is difficult and requires a high level of skill, especially during the painting process, which must be painted and dried several times. This has the problem that it takes.

In addition, when the product is used for a long time, the water resistance becomes weak due to the property of the material, torsion and cracking occurs due to shrinkage, and the impact resistance to the grain direction of the wood is weak, and above all, expensive wood is manufactured as it is. Therefore, there is a difficulty related to the increase in costs and the supply and demand of materials.

The present invention has been made for the purpose of solving such a problem, by filling wood polymer (sawdust) from the sawmill into a polymer resin containing any additives to make a resin composition, which is injected into a mold and manufactured by extrusion molding Present a new claim.

This will be described in detail by specific examples as follows.

The present invention is a manufacturing method consisting of a resin composition manufacturing step of adding a wood powder to the polymer resin to make a resin composition, a raised step of molding and putting it in a mold of a raised shape, and a post-processing step of grinding and painting the finished finished raised It is a filed made by.

In the above resin composition, 30-40% by weight of polymer resin, 50-70% by weight of wood powder, and liquid rubber within 8% by weight of the total liquid components are essentially included, and the additive is thixotropic as an additive. 0.1-0.2% by weight of the wetting agent, 0.1-0.2% by weight of the wetting agent, 1-2% by weight of the peroxide curing agent is prepared by mixing using a high speed disperser.

The disperser uses 200-400 revolutions per minute (rpm) of high speed disperser to disperse the material sufficiently evenly.

The raising step is composed of a method of precisely dispersing the prepared resin composition into a paste using a roll mill and then defoaming under vacuum to injection molding the mold.

Dispersion by a roll mill is carried out using a three-roll mill having a diameter of 30 cm to form a uniform paste having a particle size of 20 or less, and degassing is carried out at 45 ° C. for 10-30 minutes with a vacuum degree of 2-4 torr.

The injection pressure in the mold is preferably 70-80 kg / cm 2, and the molding temperature and time are preferably 10-20 minutes at 80-150 ° C.

The post-processing step is divided into grinding work and grinding work by grinding. Polishing work is to remove molding traces appearing at the joint part of the mold. Sandpaper of # 200-1000 is used, and painting work is traditionally used Complete by painting the cashews 7-8 times.

Painting is done by painting 7-8 times over 10 days.

The filed according to the present invention takes only half the painting time compared to the filed made from wood. This is because the surface of the filed according to the present invention is very dense and unlike the general wood, the surface is not porous. This is because it can give gloss, absorption effect, pore filling effect, sealing effect, and concealment effect.

Unsaturated polyester resins, epoxy methacrylate-based vinyl ester resins, melamine resins, and the like may be used as the polymer resins. Since they are liquid or powder, they can be easily mixed with wood powder and polar groups such as hydroxy, carboxyl, and epoxy groups in the resin molecule. Because it contains a high affinity with the wood powder can be obtained dense tissue.

Unsaturated polyester resins include unsaturated dibasic acids such as fumaric acid and maleic acid, and saturated dibasic times such as adipic acid, phthalic anhydride, isophthalic acid, and telephthalic acid, such as ethylene glycol, propylene glycol, trimethylolpropane, and trimethylol propane di. Dehydration and condensation reaction with glycol, such as allyl ether, at a molar ratio of 1.05: 1.00 at 170-190 ° C. for 5 hours, followed by dilution at 60-70% in a styrene monomer. 15, number average molecular weight 1,000-1,300, and viscosity 5-8 poise (25 degreeC).

The viscosity of the resin used for molding should be at least 3poise (25 ° C) or higher because when the viscosity of the resin is too low, the resin liquid flows out of the mold during molding, resulting in poor molding and difficult demolding.

Unsaturated polyester resins that can be synthesized in a similar manner include Polyester G-713BP (Seoul Miwon), Yopolac MX-505, OX 747, and OX 757 (World Polymer).

Vinyl ether resin is a bisphenol A type epoxy resin or a phenol novolak type epoxy resin having a molecular weight of 400-1,000 at 100-120 ° C. under a basic catalyst such as triethylamine or triphenylphosphine at a molar ratio of 1: 2. After the addition reaction for 4 hours to prepare a styrene monomer diluted to 55-65% by weight.

The vinyl ester resin is mainly composed of the addition reaction between epoxide and carboxyl group. The color of the synthesized resin is colorless and transparent, and has a physical value of 10-20, number average molecular weight 700-1,500 and viscosity 3-4 poise (25 ℃). Have

In case of using vinyl ester resin, if the content of styrene monomer is more than 65% by weight or the curing time is longer than 20 minutes, the resin liquid may be cut off or wood powder may be precipitated. Be careful.

Vinyl ester resins that can be synthesized by similar methods include Derkane 411, 411-C, 470 (Dow Chem), RF 1001 (Seoul Miwon), Korester R-3792 (Korea Chemical).

Melamine resin was prepared by mixing melamine and formaldehyde in a molar ratio of 1: 3 and condensation reaction at 80 ° C. for 5 hours in an alkaline solution of pH 8-10. The number average molecular weight of the resin was 300-500. Appearance is a powdery solid at room temperature.

Melamine resins synthesized by similar methods include Melopas (Ciba-geigy), Isomin (Per-stops Chem. Co), and Resimene (Momsornto).

Since it is washed with water after use, it must be water resistant. Also, if it is dropped from a high place, it must have good impact resistance and is molded at a high temperature of 100 ℃ or higher. It should have high resistance to water, and a suitable material for this purpose is liquid rubber.

Liquid rubber can improve the water resistance and impact resistance or cracking resistance of pulp.

Liquid rubber uses a derivative of a polybutadiene homer polymer having at least one active carboxyl group, amino group, hydroxyl group, epoxy group, thio group, and isocyanate group in the molecule.

The viscosity of the liquid rubber is 1,000-1,300 poise, the number average molecular weight is in the range of 800-3,500, it is preferable to use within 8% of the total liquid component.

If too much liquid rubber is used, poor molding and heat resistance may be caused.

Liquid rubbers that can be used for the purposes of the present invention include CTBNx-8, CTBNx-13, ATBNx-8 and Poly BD R45-HT, Poly RD R45-EPT, and Poly R45 from BF Good Rich Co., Ltd. -EPI, etc.

Wood flour is used as a by-product generated from wood ash. Considering the texture and reinforcing effect, it is preferable to use a particle size of 100-200 mesh and a lignin content of less than 1%.

If the particle size is smaller than this, the oil absorption amount is large, and smooth mixing is not achieved. When the particle size is too large, the surface of the molding is not smooth and rough.

If the lignin content is high, the mold may be contaminated and the mold may not be released easily.

In particular, pine wood powder has a high content of lignin and should be avoided.

Overall, the wood powder content of 50% by weight or less does not appear as a wood-like texture, the cracks in the hardened material at high temperature curing.

If the wood powder content is more than 70%, uneven hardening occurs when the wood powder impregnation in the resin solution is poor.

Additives that are optional components that improve the mixture or molding properties of the resin composition include thixotropic, wetting agents, and release agents.

The resin composition shows little flowability at room temperature, but thickening agent that increases the plasticity in the sense of reinforcing the viscosity because the viscosity drops and the resin liquid leaks out of the mold when the molding temperature is higher than 100 ° C. ) Can be used within 0.2% by weight based on the total liquid mixture.

Antarox CO-430, CO-530 (GAF) and Arosil R-972 (Degusa) which are particulate silicas can be used here.

The most important factor needed to maximize the material properties in composites is the use of wetting arent to activate the surface of the filler for this purpose with the bonding force between the filler and the resin.

Wetting agents are glycerin, diethylene glycol, trimethyloffophane, etc., which are compatible with cellulose in wood.

Suitable amounts of wetting material are 0.1-0.2% by weight relative to the filler.

KR-90 (Shinwol Glycon) was used as a release agent which can be used to smooth the demoulding of the molding from the mold.

Specific embodiments as described above are as follows.

Example 1

100 parts of G-713BP (Seoul Miwon) with unsaturated polyester resin, 6 parts with liquid rubber, 100 parts of benzoyl peroxide (BPO) with 100 parts of wood powder were mixed and milled with 3 rolls to prepare a uniform composition. Put it in a drying furnace and degassing it for 30 minutes with a vacuum degree of 2torr, inject it into a raised mold, mold it at 80 ℃ for 20 minutes, and finish the raised by processing. Post processing is performed by grinding to remove molding traces and painting in the same way as general wood machines. Post-processing is the same also in the following implementation.

Example 2

Mix 100 parts of RF 1001 (Seoul Miwon) with vinyl ester resin, 5 parts of liquid rubber, 130 parts of powder of cumyl peroxide (CPO) with a curing agent, and then mill it with a 3 roll mill to prepare a uniform composition. After degassing for 20 minutes with a vacuum degree of 3torr, it is injected into a raised mold, molded at 100 ° C for 10 minutes, and subjected to post processing to complete the raised.

Example 3

Melopas (Ciba-Geigy) 100 parts with a melamine resin, 7 parts of liquid rubber, 0.5 parts of benzoyl peroxide as a curing agent, 0.5 parts of ethylenediamine, 160 parts of wood powder with a curing accelerator were mixed sequentially and milled with three rolls to prepare a mixture of uniform composition Then, this was put into a vacuum drying furnace at 45 ° C., degassed for 10 minutes at a vacuum degree of 4 torr, injected into a raised mold, molded at 150 ° C. for 10 minutes, and subjected to post processing to complete the raised process.

The above embodiment shows an example in which the types of resins are different from each other, and the results of comparing and measuring the physical properties of the finished product according to the respective examples with those made of conventional wood are shown in Table 1.

The measurement of the above experimental results is by the following method.

1) Crack resistance

According to ASTM D 790, a vertical 10 mm diameter and 50 mm length electric metal boat is placed vertically in the center of a cylindrical container having a diameter of 50 mm and a height of 50 mm, and then a polymer resin mixture filled with wood powder is poured at 120 ° C. The cured product was obtained by heat curing for 2 hours. The heat shock was repeatedly applied to the cured product at 150 ° C. for 2 hours and at −10 ° C. for 2 hours, and the initial crack was measured. Wood mills were compared to wood mills made of ash tree under thermal shock under the above conditions.

2) boiling resistance

According to ASTM D 570, a curing test piece having a width of 100 mm, a length of 100 mm, and a thickness of 3.2 mm was immersed in water at 100 ° C. for 24 hours, then taken out, and wiped with a dry cloth to measure the water absorption. Absorption rate was determined by weight percentage of the increased weight based on the initial weight.

3) flexural strength

According to ASTM D 790, a test piece having a length of 80 + 1 mm, a width of 20 + 0.2 mm, and a thickness of 3.2 + 0.1 mm was prepared and measured using a universal tester having a capacity of 150 tons. During the test, the descending speed of the head was 2 mm / min and the test stand was 100 mm long, 50 mm wide and 50 mm deep.

4) impact strength

According to ASTM D 256, a test piece having a length of 64 + 1 mm, a width of 12.7 + 0.1 mm, and a thickness of 3.2 + 0.1 mm was prepared, and then measured by the Izod test method in an unnotched state using an impact tester.

5) Heat Deflection Temperature (HDT)

According to ASTM D 648, a test piece having a length of 127 mm, a width of 12.7 mm, and a thickness of 3.2 mm was prepared, and the temperature was increased at a rate of 2 ° C./min under a pressure of 18.56 kg / cm 2 to measure the temperature at which the vertical bending strain became 2.54 mm.

6) non-toxic

After the cured product was immersed in boiling water for 24 hours, elemental absorption analysis was performed on the extract to examine the eluted heavy metals and harmful substances.

The filing made by the above method is superior in the properties such as workability, boiling water resistance, impact resistance, crack resistance, etc., compared to filing made by solid wood, and there is no difference in texture. It was able to reduce it and has the effect of solving the problem of lack of timber resources caused by making woodwork.

Claims (2)

30-40% by weight of the melamine resin having a molecular weight of 300-500, 50-70% by weight of wood powder, 1-8% by weight of liquid rubber is essential, and other additives include 0.1-0.2% by weight of thixotropic additive and 0.1% of wetting agent. A step of preparing a thermosetting resin composition prepared by adding -0.2% by weight and 1-2% peroxide curing agent and blending it with a high-speed disperser; A raised molding step of precisely dispersing the resin composition into a paste, followed by degassing under vacuum and injecting the raised mold into a mold; A filing made by molding a wood-filled polymer resin composition, characterized in that it is manufactured by a post-processing step of grinding and removing the molding traces of the finished filings. The method of claim 1, wherein the wood flour has a particle size of 100-200 mesh and lignin content in the range of less than 1%.