阅读说明：本技术 一种无醛无味pvc发泡板材及其加工方法 (Formaldehyde-free odorless PVC (polyvinyl chloride) foamed sheet and processing method thereof ) 是由 顾成兵 杨文瑞 徐刚 吴哲荣 韩飞 刘欢 孙国进 于 2019-12-03 设计创作，主要内容包括：本发明提供了一种无醛无味PVC发泡板材及其加工方法,与现有技术相比,本发明以钙锌环保配方为基础,以氧化硅、沸石应用在PVC发泡板材配方中,研发出一种无醛无味PVC发泡板材。而且,根据配方的特点设计相应的生产方法。本发明提供的无醛无味PVC发泡板材,不仅自身零甲醛,由于氧化硅、沸石的分子筛结构,使得板材具有显著的吸收甲醛的功能,可广泛应用在室内家具制作,墙面装饰及广告卫浴等领域,提升了家具板材的生态环保性能。(Compared with the prior art, the invention develops the formaldehyde-free odorless PVC foamed sheet by applying silicon oxide and zeolite in the PVC foamed sheet formula based on the calcium-zinc environment-friendly formula. Moreover, a corresponding production method is designed according to the characteristics of the formula. The formaldehyde-free odorless PVC foaming board provided by the invention is free of formaldehyde, has a remarkable formaldehyde absorption function due to the molecular sieve structure of silicon oxide and zeolite, can be widely applied to the fields of indoor furniture manufacturing, wall decoration, advertising, bathroom and the like, and improves the ecological environment-friendly performance of furniture boards.)

1. The formaldehyde-free odorless PVC foaming board is characterized by comprising the following raw materials in parts by weight:

2. the formaldehyde-free odorless PVC foamed sheet according to claim 1, wherein the calcium zinc stabilizer is selected from JCS-106 calcium zinc stabilizer.

3. The formaldehyde-free and odorless PVC foamed sheet according to claim 1, wherein the silicon-based material is preferably silica.

4. The formaldehyde-free odorless PVC foamed sheet according to claim 1, wherein the lubricant is selected from G60 lubricant.

5. The formaldehyde-free, odor-free PVC foamed sheet according to claim 1, wherein the hydrocarbon-based wax lubricant is selected from RL915 hydrocarbon-based wax lubricants.

6. A method for processing the formaldehyde-free odorless PVC foamed sheet according to any one of claims 1 to 5, wherein the method comprises the following steps:

1) firstly, adding PVC with a formula amount into a hot mixing pot, then adding calcium carbonate, finally adding other raw materials with a formula amount, when the mixed material reaches 110-;

2) homogenizing: homogenizing the mixture after the mixture enters a dry mixing warehouse;

3) extrusion molding;

4) and (6) cooling and shaping.

7. The process of claim 6 wherein the step 1) hot mixing time is 1200-1300S.

8. The process of claim 6 wherein the time period for the cold mixing in step 1) is 260-300 s.

9. The processing method as claimed in claim 6, wherein the amount of the mixed material in step 1) is 60-70% of the volume of the pot body.

10. The process of claim 6 wherein the extrusion settings of step 3) are as follows: first (170 + -10) DEG C for barrel heating, second (165 + -10) DEG C for barrel heating, third (165 + -10) DEG C for barrel heating, fourth (165 + -10) DEG C for barrel heating, fifth (160 + -10) DEG C for barrel heating, 145 + -10℃ for screw temperature, first (160 + -10) DEG C for connector temperature, second (160 + -10) DEG C for connector temperature, first (180 + -10) DEG C for mold heating zone, second (180 + -10) DEG C for mold heating zone, third (180 + -10) DEG C for mold heating zone, fourth (180 + -10) DEG C for mold heating zone, fifth (180 + -10) DEG C for mold heating zone, sixth (180 + -10) DEG C for mold heating zone, seventh (180 + -10) DEG C for mold heating zone, eighth (200 + -10) DEG C for mold heating zone, ninth (200 + -10) DEG C for mold heating zone, 19 + -2) DEG C for screw rotation, 30 + -5) rpm for charging, 50-60% for extrusion load, 0.5 + -0.1 m/min for traction, and/min for traction, The temperature of oil of the mouth mold is 170 +/-10 ℃, the temperature of water of the mouth mold is 40-60 ℃, the vacuum negative pressure is (-0.04 to-0.07) Mpa, the temperature of melt is 180 +/-10 ℃, and the operating current is (5 +/-0.5) A.

Technical Field

The invention belongs to the field of PVC (polyvinyl chloride) foamed plates, and particularly relates to an aldehyde-free odorless PVC foamed plate and a processing method thereof.

Background

With the increasing requirements of people on living environment, people are continuously pursuing more novel decoration and building materials, so that the appearance is luxurious, and the versatility of the living environment can be reflected, but the novel decoration causes more serious indoor air pollution, and among the indoor pollutants, formaldehyde has the greatest threat to the health of people. Therefore, it is not easy to treat the formaldehyde harmful gas in the indoor air and purify the indoor air.

At present, a method of activated carbon adsorption and ventilation enhancement is adopted for indoor formaldehyde after decoration, belongs to a method for treatment in a later physical adsorption mode, and does not solve the problem fundamentally.

Disclosure of Invention

In order to solve the technical problems, the invention provides an aldehyde-free odorless PVC foaming sheet material, which is developed by applying silicon oxide and zeolite in a PVC foaming sheet material formula on the basis of a calcium-zinc environment-friendly formula. The formaldehyde-free wood floor board disclosed by the invention is free of formaldehyde, has a remarkable formaldehyde absorption function, can be widely applied to the fields of indoor furniture manufacturing, wall decoration, advertising, bathroom and the like, and improves the ecological environment-friendly performance of the furniture board.

The invention also provides a processing method of the formaldehyde-free odorless PVC foaming board, and the production foaming process and the process matched with the formula design of the formaldehyde-free odorless PVC foaming board ensure the production stability and the quality of the product.

The specific technical scheme of the invention is as follows:

the invention provides an aldehyde-free odorless PVC (polyvinyl chloride) foaming plate which comprises the following raw materials in parts by weight

The PVC is preferably internal Mongolian Wuhai SG-8 type PVC;

the calcium zinc stabilizer is selected from JCS-106 calcium zinc stabilizer;

the lubricant is selected from a G60 lubricant;

the silicon-based material is preferably silicon oxide.

The oxidized polyethylene wax is selected from oxidized polyethylene wax AC 316A;

the foaming agent is selected from foaming agent W3833.

The foaming regulator is selected from a foaming regulator LP801

The hydrocarbon-based wax lubricant is selected from RL915 hydrocarbon-based wax lubricants.

The invention provides a processing method of an aldehyde-free odorless PVC (polyvinyl chloride) foaming plate, which comprises the following steps of:

1) firstly, adding PVC with a formula amount into a hot mixing pot, then adding calcium carbonate, finally adding other raw materials with a formula amount, when the mixed material reaches 110-;

2) homogenizing: homogenizing the mixture after the mixture enters a dry mixing warehouse;

3) extrusion molding;

4) and (6) cooling and shaping.

Further, the hot mixing time in the step 1) is 1200-1300S;

further, the cooling mixing time in the step 1) is 260-300 s; preferably, the temperature of the cold mixing cooling water is controlled to be 13-15 ℃ generally, and the blanking temperature is set to be 40 ℃.

Further, weighing the raw materials according to the formula amount before hot mixing in the step 1), and accurately weighing the raw materials to 0.01 Kg;

further, in the hot mixing pot in the step 1), the side edge of the flow deflector is 3cm away from the pot wall;

preferably, the amount of the mixed materials accounts for 60-70% of the volume of the pot body.

Setting the hot mixing temperature of the invention:

the temperature of the hot mixing discharge determines the process of uniform plasticization of the extruded material. The hot mixing temperature is too low, the material is unloaded for cold mixing when the preset temperature is not reached, the material is kneaded unevenly in the mixing tank, namely the recombination and homogenization of PVC particles are incomplete, the apparent density and gelation of the particles are influenced, the performances of all components of the raw material cannot be mutually coordinated and fully exerted, the water of the material is not thoroughly analyzed, the set temperature of an extruder is influenced, but sometimes the temperature of a machine barrel is adjusted to be very high and still cannot be well plasticized, so that the physical and chemical properties of the product are reduced; when the mixing temperature is too high, the materials are easily degraded in the mixing tank, so that the production is difficult to continue. The design of the invention generally adopts 7 type or 8 type PVC resin to produce the formaldehyde-free odorless PVC foaming plate, and the temperature of 110-. When the filling amount of the light calcium is increased by 10 percent, the hot mixing temperature can be increased by 1 ℃, the temperature is increased to be beneficial to the PVC material and the low-melting-point component to adsorb calcium carbonate in a balanced manner, but the highest temperature cannot exceed 125 ℃, and the apparent density and the flow speed uniformity of the mixture are improved.

The mixing time effect:

the processes of compaction, homogenization and partial gelation of the materials in the mixing process all need a certain time to complete. The extended compounding time helps the stabilizer and other additives to diffuse more uniformly into the resin to further improve the material stability and uniformity. The mixing time of the materials in the high-speed mixer is at least 1200-1300S, so that the mixture with uniform quality can be obtained.

Influence of the amount of charge in the high-speed mixer:

the total volume of hot mix per pot is also not negligible. The single-pot mixing amount is small, the shearing heat is low, the temperature rise is too slow, the mixing time is long, and the production efficiency is low; too much material mixing amount in a single pot, too high shearing heat, too fast local temperature rise, short material mixing time and uneven dispersion of material components; if the mixing load is too heavy, the speed of the variable frequency motor is reduced or the belt pulley slips, and the mixing time is prolonged. The amount of the designed mixture accounts for 60-70% of the volume of the pot body, the pre-gelling effect of the calcium-zinc formula mixture is the best, and the production of the plate is stable.

The position of the hot mixing flow deflector:

the hot mixing flow deflector is in a semi-elliptical cambered surface, so that the angle of the flow deflector in the mixing pot directly influences the material tumbling effect in the pot, and further influences the material homogenizing and pre-gelling effects.

The invention has the following mixed material cold mixing:

after the hot mixing and preplasticizing, the material temperature is quickly reduced from above 110-115 ℃ to below 45 ℃ by the low-speed stirring of cold mixing, thereby preventing the material from thermal degradation and foaming decomposition of the foaming agent. Meanwhile, static generated by high-speed stirring is eliminated, the most suitable cold mixing time of the calcium-zinc formula is 260-300 seconds, the temperature of cold mixing cooling water is usually controlled to be 13-15 ℃, meanwhile, the blanking temperature is set to be 40 ℃, and the relative balance between the static content of the material and the decomposition ratio of the foaming agent is optimal.

In the step 2), the dry mixing warehouse is provided with a homogenizing pipeline, so that the materials can be uniformly dispersed in the mixing warehouse, and meanwhile, in the continuous mixing production process, the mixtures of different batches are uniformly dispersed in the same mixing warehouse, so that the materials are more uniform and stable in extrusion production.

Further, in the step 3), the homogenized dry mixture is conveyed to an extrusion device by using negative pressure and screw conveying, the material is heated by an extrusion cylinder area and a mold area to gradually plasticize the powdery material into a semi-solid material, and a parison with a certain shape is formed by the cylinder area and the mold under the conveying of the screw, wherein the temperature of the parison is higher and can reach 180-190 ℃.

The extrusion process strictly controls the plasticizing temperature:

the plasticizing temperature has a great influence on the bubble structure and the density and surface quality of the foamed product. The plasticizing temperature is influenced by the K value of the PVC resin, the formula composition and the shearing force of the screw on the material. When the plasticizing temperature is lower, the melt viscosity is high, not only is the plasticizing influenced, but also the foaming is incomplete, the gas-containing melt is not uniformly mixed, the nucleation is less, the dispersion is uniform, large bubbles are formed, and the foaming density is high; if the plasticizing temperature is lower than the decomposition temperature of the foaming agent, the melt is not foamed at all; when the temperature rises to a certain value, the materials are uniformly mixed and well plasticized, the solubility of gas in the melt is increased, and the nucleation number is increased, so that a foaming body with small pore diameter density can be formed; if the plasticizing temperature is too high, the melt viscosity is too low, and too large bubbles are generated. The film is torn due to the reduction of strength, most of bubbles disappear, and the finished product has incomplete surface, higher density and yellowing surface.

Basic principles of extruder temperature setting:

aiming at the fact that in the process of extruding and foaming the formaldehyde-free odorless PVC foaming board with the formula, the basic principle of temperature setting is as follows: the basic principle of temperature setting is: from high to low in the extruder. 1. The temperature of the 2-stage is preferably set to be higher so as to facilitate plasticization; but should not be higher than the decomposition temperature of the foaming agent, otherwise the melt will foam in advance in the vent holes and escape in the vacuum holes, affecting the gas evolution. The temperature of the 3-5 area is gradually reduced, the melt pressure is kept to be stably increased, and the melt is prevented from decomposing and foaming in the machine due to the change of the melt pressure in the extrusion process; the core temperature should be lower than the above zones.

Further, the extrusion molding setting parameters in the step 3) are as follows: first (170 + -10) DEG C for barrel heating, second (165 + -10) DEG C for barrel heating, third (165 + -10) DEG C for barrel heating, fourth (165 + -10) DEG C for barrel heating, fifth (160 + -10) DEG C for barrel heating, 145 + -10℃ for screw temperature, first (160 + -10) DEG C for connector temperature, second (160 + -10) DEG C for connector temperature, first (180 + -10) DEG C for mold heating zone, second (180 + -10) DEG C for mold heating zone, third (180 + -10) DEG C for mold heating zone, fourth (180 + -10) DEG C for mold heating zone, fifth (180 + -10) DEG C for mold heating zone, sixth (180 + -10) DEG C for mold heating zone, seventh (180 + -10) DEG C for mold heating zone, eighth (200 + -10) DEG C for mold heating zone, ninth (200 + -10) DEG C for mold heating zone, 19 + -2) DEG C for screw rotation, 30 + -5) rpm for charging, 50-60% for extrusion load, 0.5 + -0.1 m/min for traction, and/min for traction, The temperature of oil of the mouth mold is 170 +/-10 ℃, the temperature of water of the mouth mold is 40-60 ℃, the vacuum negative pressure is (-0.04 to-0.07) Mpa, the temperature of melt is 180 +/-10 ℃, and the operating current is (5 +/-0.5) A.

The die temperature and gap settings were based on uniform discharge of the melt from the die:

because the foam has poor material fluidity than that of the compact foam, the skinned foam board has an inner core with dense and uniform foam holes and a hard and compact appearance. The melt temperature should be such that it is within the decomposition temperature range of the blowing agent and is high at both ends and low in the middle when the melt reaches the die. The farther off-center locations are heated to facilitate consistent melt flow across the die lip. The die lip clearance is also set to be small in the middle and large on two sides, and the die lip clearance designed by the invention is 1/4-1/3 of the thickness of the plate. The purpose is to achieve uniform thickness and pressure of the molten blank on the whole plate surface.

And 4) cooling and shaping the high-temperature parison from the extruder in a shaping table under the tension of a tractor, wherein the shaping table is divided into four sections, cooling water is introduced into each section of the shaping table, the temperature of the cooling water is controlled to be 25-35 ℃, and the surface temperature and the internal temperature of the plate passing through the shaping table are reduced to the normal temperature, so that the skinned foamed plate with higher strength is formed.

Further, after cooling and shaping in the step 4), packaging. The recycled material is used as the edge cutting recycled material of the PVC foaming plate and is continuously used as the raw material of the formula.

The formaldehyde-free odorless PVC foamed sheet provided by the invention adopts a low foaming skinning production technology, and a formula system of the formaldehyde-free odorless PVC foamed sheet is successfully researched and developed by deeply researching components of each formula and combining characteristics of each raw material.

The components and the functions of the invention are as follows:

the stabilizing component is that the formaldehyde-free odorless PVC foaming plate has higher material temperature in the extrusion plasticizing process, and the foaming agent can also generate decomposition heat in the foaming process, so that the requirement on the thermal stability of the stabilizing agent is high. According to the invention, a calcium zinc stabilizer JCS-106 is used as a core stabilizer, the formula plasticizing performance is improved by using AC-316A, and the problems of initial colorability, uneven foaming, easy paste and the like are mainly solved by matching with the design of the consumption of other raw materials.

A lubricating component: the G60 internal lubricant and the PE wax external lubricant are used as core lubricants, and high-temperature-resistant lubricants such as PP wax, RL915 alkyl wax lubricants and the like are used for internal and external sliding cooperation, so that the system meets the long-term production stability of the plate in the formula, reduces precipitation under the condition of ensuring the demolding property, and improves the finish and apparent quality of the product.

Foaming and foam conditioning components: the foaming agent uses W3833 series as a core foaming agent, does not contain azo groups, and does not generate decomposition residues to influence the detection of environmental protection performance. The foaming regulator adopts LP-801 foaming regulator, and various acrylic ester monomers are subjected to multistage emulsion polymerization, so that the foam structure is mainly regulated in a formula system, the plasticization can be promoted, the melt strength and the ductility can be obviously improved, the foam holes of the plate are uniform and fine, and the production stability of the product is improved.

Formaldehyde absorbing material and filler component: in the formula system of the invention, the formaldehyde absorbing material adopts silicon oxide and zeolite materials, has a natural molecular sieve-shaped pore structure, has a specific surface area which is 5000-6000 times that of active carbon, has good adsorption performance and ion exchange performance, has obvious formaldehyde absorbing effect, can strongly adsorb harmful substances such as formaldehyde, benzene, ammonia and the like in the air, and utilizes nano group substances with super-strong oxidation capability to oxidize and decompose harmful voc substances such as benzene, xylene and the like under the illumination condition, thereby well solving the indoor pollution problem seriously puzzling the house at present. The silicon oxide and the zeolite have good adsorption performance and ion exchange performance, and the formaldehyde adsorption effect is obvious. The filler adopts light calcium carbonate, and can reduce the material cost besides being used as a foaming nucleating agent. The silicon oxide and zeolite materials can form a porous structure on the surface of the plate in the formula, and the structure not only forms a molecular sieve, but also can absorb formaldehyde by utilizing molecular gaps. The compatibility of the silicon oxide and materials in the formula is poor, the stability is not high, but the stability of the zeolite in the formula can be improved, the paste phenomenon in the production process is reduced, but the plasticizing is poor easily due to excessive addition, so in the formula design of the invention, the silicon oxide is used as a main adsorption material, the zeolite is used as an auxiliary stable component, the dosage ratio of the silicon oxide to the zeolite is controlled, the stability of the formula can be balanced, a good surface adsorption effect can be achieved, and most preferably, the zeolite is 10% of the dosage of the silicon oxide.

On the basis of a calcium-zinc environment-friendly formula system, the invention combines the characteristics of raw materials of the calcium-zinc environment-friendly formula, and adds silicon oxide, zeolite and other raw materials to develop a new formula system. The PVC foaming board has the advantages that the traditional PVC foaming board is light in weight, moisture-proof, free of formaldehyde and the like, the function of absorbing formaldehyde is added, and the high requirements of people on decoration and environmental protection are better met. At present, the common specification of the formaldehyde-free odorless PVC foaming sheet material is 2440 x 1220mm, and the sheet thickness is 3mm, 6mm, 10mm, 12mm, 15mm and 18 mm. The decorative material is mainly applied to the fields of furniture manufacture, wall decoration, interior decoration of passenger cars and the like, and is a universal basic decorative material.

The application of the formaldehyde absorbing material in the high molecular ecological furniture board needs to consider the formaldehyde absorbing effect brought by the silicon oxide and the zeolite in a formula system and also needs to solve the fluctuation of the production process of the product, so that a specific process needs to be matched with the production process in the whole production link from material mixing to extrusion.

In the aspect of a material mixing process, according to the properties, physical characteristics, pre-plasticizing requirements and the like of different raw materials in a formula, the hot mixing rotating speed and the material mixing time are adjusted, the pre-plasticizing effect is improved, and the mixture is uniform and stable. The specific design idea is as follows:

change of material form in the hot mixing process:

the mixing is actually a process of compacting, homogenizing, dehumidifying and pregelatinizing after mixing production auxiliary materials and PVC. In the whole process, all auxiliary material micro-components are adsorbed on the surface of PVC particles, the PVC resin is gradually melted and plasticized after friction and shearing, and then is recrystallized to form a network morphological structure, and in the high-speed hot mixing process, the PVC resin has morphological changes of particle refinement and uniform particle size, shows the characteristics of density increase and partial gelation, and finally forms uniform dry mixed materials.

Compaction typically the apparent density of the PVC resin is only 0.45-0.55 g/ml. In the high-speed mixing process, due to the action of high shear force generated by heating, mutual collision and friction, the temperature of the materials is continuously increased, PVC particles, silicon oxide and other components are continuously permeated with each other, the surface of the PVC particles gradually absorbs or adsorbs a stabilizer, a melted lubricant, a processing aid and the like, and the apparent density of the mixture can be increased to 0.65-0.75 g/ml.

Homogenization, i.e., in a high-speed mixer, the components can not only achieve good mechanical mixing, but also obtain good stable dispersion among the components. Along with the continuous increase of the temperature, the PVC particles can continuously absorb the stabilizer, the lubricant and the like and are gradually coated by the components, and when the temperature is increased to 110-120 ℃, uniform and stable dry mixed powder can be formed.

And (3) moisture removal, namely when the temperature of the material is raised to about 100 ℃, moisture and other volatile substances in the resin and the auxiliary agent components are removed by moisture removal and dust collection, so that bubbles and defects generated in the profile extrusion process are avoided.

And (2) pregelatinization, namely gelation of PVC, namely a process of gradually melting and plasticizing the resin in a processing process and then recrystallizing to form a network morphological structure, wherein in a high-speed hot mixing process, the PVC resin not only has morphological change of particle refinement and uniform particle size, but also shows the characteristics of increased density and partial gelation. Therefore, the high-speed hot mixing process of the PVC material is also the process of homogenizing, densifying and partially gelatinizing the PVC resin, and although the material gelatinization is not the main purpose of mixing, part of PVC particles are gelatinized in the mixing process. The small particles with larger surface area are easy to be subjected to larger friction, reach a gelation state and present a similar transparent state, the small particles are gradually melted at higher temperature and aggregated together to become larger particles, the PVC with the surface gelation can well absorb various additives, and finally the common dry mixture with better uniformity and dry flow property is obtained.

In the material mixing link, the rotating speed of a low-speed material mixing motor is controlled to be 25HZ, the rotating speed of a high-speed material mixing motor is controlled to be 45HZ, and due to the fact that the lubricating performance of the formula is good and the friction force between materials is small, the hot material mixing time is controlled to be 1200S-1300S in the material mixing process, compared with the common formula, the material mixing time is longer, but through sampling detection and extrusion operation of the mixture, the detection data are normal, and the production operation is stable. In order to meet the requirement of higher glossiness of the surface of the plate, a lubricant with a higher proportion is added into a formula, so that the friction force between materials in the material mixing process is smaller, the heating rate is slower, but in the slow heating process, materials such as PVC (polyvinyl chloride) fully absorb silicon oxide and zeolite, a porous structure is formed on the surface of the plate in the extrusion production process, meanwhile, the hardness of the surface of the plate is higher, the Shore hardness can reach 80 units, the foaming is more compact, and the density can reach 0.65kg/m, so that the strength of the plate is improved.

In the aspect of an extrusion process, the basic principle of temperature setting is as follows: the temperature of each barrel area of the extruder is set from high to low, the temperature of the areas 1 and 2 is preferably higher so as to facilitate plasticization, but the temperature is not higher than the decomposition temperature of the foaming agent, otherwise, the melt foams in advance in the exhaust holes and escapes from the vacuum holes to influence the gas forming amount; the temperature of the 3-5 area is preferably gradually reduced, the melt pressure is kept to be stably increased, and the melt is prevented from decomposing and foaming in the cylinder due to the change of the melt pressure in the extrusion process. The foamed sheet material is different from the profiled bar, has large surface area, wide cross section and flatness, can be tightly adhered to the shaping plate as long as the foamed melt has enough expansion and foam cell rate, and can not use the traditional vacuum dehumidifying system. Thirdly, the gap between the die lip and the template of the shaping device not only determines the thickness of the plate, but also influences the foaming ratio. The die lip gap designed by the invention is 1/4-1/3 of the thickness of the plate.

The invention has the following advantages:

1) production inspection is carried out strictly according to the GB/T2463.2-2018 standard, and each performance meets the national standard and the use requirement of users.

2) Environmental protection, no pollution, no public nuisance, and recycling. The product does not contain benzene substances, the content of formaldehyde is lower than 1.5mg/L and lower than the EO grade standard, the wood consumption is greatly saved by recycling, and the product is suitable for sustainable development of national policy and benefits society.

3) The main raw material PVC is less influenced by acid and alkali; the water absorption is only 0.9%; effectively prevent worm damage. Can be used in environments where wooden products cannot be used.

4) The processing and installation are convenient, and the core layer micro-foaming technology is adopted in the board, so that the density of the foamed product is close to that of wood. The processing requirements of similar wood can be nailed, planed, sawed and drilled, and the surface can be printed. Compared with a wooden plate, the installation is quicker, the traditional operation modes of putty smearing, paint brushing and the like are not needed, the factory standardized production is realized, the numerical control machine tool mills the hinge, the lock hole and the decorative window hole, the size standard is accurate, and the integral tightness is ensured during field installation. The split building block type structure is adopted, the transportation is convenient, the field installation is convenient, the complicated manual processing and manufacturing process on the field is avoided, the road of factory assembly line operation is avoided, and the furniture manufacturing and installing efficiency is improved. The processing means is diversified, no professional is needed, and the processing tool is strong in universality.

Compared with the prior art, the invention develops the formaldehyde-free odorless PVC foaming board by applying the silicon oxide and the zeolite in the formula of the high-molecular ecological furniture board on the basis of the calcium-zinc environment-friendly formula. Moreover, a corresponding production method is designed according to the characteristics of the formula. The formaldehyde-free odorless PVC foaming board provided by the invention has no formaldehyde, has a remarkable formaldehyde absorption function, can be widely applied to the fields of indoor furniture manufacturing, wall decoration, advertising, bathroom and the like, and improves the ecological environment-friendly performance of the furniture board.

Drawings

FIG. 1 is a flow chart of the production process of the present invention;

FIG. 2 is a flow chart of the mixing process of the present invention;

FIG. 3 is a flow chart of the extrusion molding and cooling setting process of the present invention;

FIG. 4 is a schematic diagram of the material change in the hot mixing process of the present invention.

Detailed Description