CN112706487A - One-step forming spraying-free wood grain foam and production process thereof - Google Patents

One-step forming spraying-free wood grain foam and production process thereof Download PDF

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Publication number
CN112706487A
CN112706487A CN202011537263.8A CN202011537263A CN112706487A CN 112706487 A CN112706487 A CN 112706487A CN 202011537263 A CN202011537263 A CN 202011537263A CN 112706487 A CN112706487 A CN 112706487A
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Prior art keywords
foam
wood grain
layer
spraying
functional layer
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CN202011537263.8A
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Chinese (zh)
Inventor
柳景亚
魏琼
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Guangde Xiangyuan New Material Technology Co ltd
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Guangde Xiangyuan New Material Technology Co ltd
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Priority to CN202011537263.8A priority Critical patent/CN112706487A/en
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
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    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
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    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
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    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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Abstract

The invention discloses a one-step forming spraying-free wood grain foam and a production process thereof, wherein the one-step foaming forming multi-layer structure sequentially comprises a high-transparency scratch-resistant layer, a wood grain texture layer and a foam functional layer from top to bottom. The texture effect of the wood grain foam has concave-convex feeling, the foam hole size of the foam is fine and smooth, the scratch resistance is realized, and the appearance is good; can be widely applied to walls, floors and the like, and has the functions of decoration and buffering, thereby bringing unrivalled comfort to users.

Description

One-step forming spraying-free wood grain foam and production process thereof
Technical Field
The invention relates to foam products, in particular to one-step forming spraying-free wood grain foam and a production process thereof.
Background
The traditional wood grain products are usually non-foamed or micro-foamed plates, and the integral structure is formed by integrating a scratch-resistant layer, a wood grain layer and a foam cotton layer through a thermal composite molding mode or a glue bonding mode, wherein the wood grain layer is generally prepared by printing a layer of wood grain patterns on the surface of a film. The traditional preparation method of the wood grain product has the problems of complicated processing steps, high processing cost, great waste in the processing process and the like, and the wood grain layer generally only has the change of texture and color and is difficult to have substantial concave-convex texture of wood grains.
The foaming product of prior art and the non-foaming wood grain layer and the high transparent resistant layer of scraping can only compound with the bubble cotton through the mode that thermal recombination or glue bond, and prior art is difficult to form the high bubble cotton layer of multiplying power simultaneously, and the multiplying power is lower usually, and the compliance is relatively poor, is difficult to provide enough comfortable experience for the user and feels. Similar multilayer structures formed in the prior art generally employ glue application or thermal lamination. What the glue laminating mode brought is the glue in the glue laminating process, the increase of cost such as manual work, and the cost can only be produced through modes such as printing in the wood grain layer simultaneously, has brought the further increase of cost, and the wood grain line that forms simultaneously does not have unsmooth feel. The thermal compounding method usually requires heating, and a similar multilayer foam structure usually generates compression permanent deformation in a hot state, so that the multiplying power of the foam is reduced, the softness of the foam is further greatly reduced, poor experience is brought, and the cost can be increased by thermal compounding.
However, the general one-step forming foaming method can only form a foam functional layer with a low multiplying factor, or the foam functional layer can only expand the dimension in the Z direction (the normal direction of the largest face of six faces in a foam cube, i.e. the vertical direction of the application face of foam).
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a one-step forming spraying-free wood grain foam which has a multilayer structure and is provided with a high-transmittance scratch-resistant layer, a wood grain texture layer and a foam functional layer from top to bottom, wherein the foam functional layer can be designed into a single-layer structure or a multilayer structure. The wood grain foam has special wood grain-like appearance and concave-convex texture, the appearance is close to the effect of real wood grains, the foam holes of the foam are fine and smooth in size, and the foam has good appearance; can be widely applied to walls, floors and the like, and has the functions of decoration and buffering, thereby bringing unrivalled comfort to users.
In order to achieve the purpose, the one-step forming spraying-free wood grain foam is designed, the foam is of a one-step foaming forming multilayer structure and sequentially comprises a high-transmittance scratch-resistant layer, a wood grain texture layer and a foam functional layer from top to bottom (the product of the invention is a decorative product, the wood grain texture layer is distributed between the high-transmittance scratch-resistant layer and the foam layer, if more layers are arranged, the multilayer structure functional layer is distributed on a connecting wood grain layer at the other side far away from the high-transmittance scratch-resistant layer to form the whole wood grain foam functional layer, and the texture effect of the wood grain foam of the whole wood grain foam functional layer, such as antibacterial, flame retardant, antistatic and other characteristic functional layers, can be adjusted according to the foaming multiplying power of the foam functional layer); wherein the content of the first and second substances,
the raw material of the wood grain texture layer consists of composite particles A and composite particles B, wherein the composite particles A comprise low-melting-point resin, the composite particles B comprise high-melting-point resin and toner, and the weight of the toner is 0.1-10% of the total weight of the toner and the high-melting-point resin; and the average melting point of the B composite particles is the average melting point of the A composite particles plus 5-40 ℃;
furthermore, the viscosity difference (B-A) of the B combination particles and the A combination particles is more than 150Pa S and less than 1300Pa S under the conditions that the temperature of the raw material of the wood grain texture layer is 110-140 ℃ and the shear rate is 500-1000/S.
The average melting point of the low-melting-point resin is 50-110 ℃, and the low-melting-point resin is any one or more of EVA, EAA, LDPE, LLDPE and EPDM;
the average melting point of the high-melting-point resin composition is 90-130 ℃, and the high-melting-point resin composition is LLDPE or MDPE, the wood grain texture layer deviates from the foam functional layer, one side of the wood grain texture layer which deviates from the high-transparency scratch-resistant layer is a side which is frequently contacted with people or other objects, and the scratch resistance of the surface of a product needs to be improved.
Further, the raw material of the high-penetration scratch-resistant layer comprises any two or more of HDPE, MDPE and LLDPE, random copolymerization PP, isotactic copolymerization PP and homopolymerization PP; it is 100N/mm2Young's modulus not less than 1500N/mm2(high hardness, Young's modulus is not less than 100N/mm)2(ii) a The high-transmittance scratch-resistant layer preferably adopts formula components with hardness higher than that of the foam functional layer, so that the overall scratch resistance of the product is improved, and the high-transmittance scratch-resistant layer can well match with the foam functional layer and the wood grain texture layer in compatibility).
Still further, the A composite particles also comprise one or more of a filling material, an interfacial compatilizer, a plasticizer, an antioxidant and a crosslinking agent.
Still further, the raw materials of the foam functional layer comprise resin, a foaming agent and other auxiliary agents; the resin is selected from one or more of EVA, LDPE, LLDPE, EAA, EPDM, POE and POP; the foaming agent is selected from one or more of ADCA, OBSH and DPT, and the other auxiliary agents are selected from one or more of antioxidants, auxiliary antioxidants, antibacterial agents, antistatic agents, flame retardants, fillers and foaming catalysts (the foam functional layer has the characteristics of static electricity prevention, flame retardance, heat insulation, heat preservation, buffering, sealing, water proofing, sound insulation, shock absorption and the like according to different use requirements).
Still further, the density of the foam functional layer is 50-800kg/m3The density of the wood grain foam is 50-1000kg/m3。
The second purpose of the invention is to provide a production process of one-step molding spraying-free wood grain foam, the process is simple, wood grain textures with concave-convex texture can be formed in a one-step extrusion molding mode, a final spraying-free one-step molding wood grain foam product is formed in a one-step foaming molding mode, the wood grain textures and the concave-convex texture are directly formed in a one-step molding mode, redundant processes of spraying or printing are avoided, and meanwhile, the one-step molding wood grain foam product has bright and fine colors and lines.
The invention provides a production process of one-step forming spraying-free wood grain foam, which is characterized in that raw materials of a high-transparency scratch-resistant layer, a wood grain texture layer and a foam functional layer are respectively gathered into a multi-layer co-extrusion die through three extruders, a multi-layer structure substrate formed by co-extrusion through a multi-layer die head is formed into the wood grain foam through a one-step forming foaming mode,
in the forming and foaming process, the foaming temperature is T + 60-T +160 ℃ (T is the average melting point in the formula components of the foam functional layer).
Preferably, in the multilayer co-extrusion die, the extrusion flow Q of the substrate of the foam functional layer1And extrusion flow rate Q of the wood grain texture layer2The relationship of (1) is: q is not less than 31/Q2≤100。
Preferably, the composite particles A and the composite particles B can form uneven extrusion of color master batches of toner and resin during mixing and co-extrusion, the color master batches generate agglomeration effect, the weight fraction of the color master batches agglomerated in the color master batches with the particle size of more than or equal to 5 mu m and less than or equal to 100 mu m is more than or equal to 50 percent,
preferably, the weight fraction of the color master batch particle aggregates with the particle size of more than or equal to 5 μm and less than or equal to 100 μm in the color master batch particle aggregates is more than or equal to 65 percent. (the wood grain texture layer has a concave-convex texture, and one reason for the generation of the wood grain layer is the concave-convex texture and various color distributions exhibited by non-uniformly dispersing the color master batches of a specific color on the surface of the base foam layer).
The invention has the beneficial effects that:
the one-step formed spraying-free wood grain foam prepared by the invention has special wood grain simulation appearance and concave-convex texture, the appearance is close to the real wood grain effect, and the one-step formed wood grain foam is directly formed in a one-step forming mode, so that redundant processes of spraying or printing are avoided. The texture effect of the wood grain foam has concave-convex feeling, the foam hole size of the foam is fine and smooth, the scratch resistance is realized, and the appearance is good; can be widely applied to walls, floors and the like, and has the functions of decoration and buffering, thereby bringing unrivalled comfort to users.
Detailed Description
The present invention is described in further detail below with reference to specific examples so as to be understood by those skilled in the art.
Example 1
The formula and the production process of each layer of the one-step forming spraying-free wood grain foam 1 are as follows:
a. the high-transparency scratch-resistant layer comprises the following components in percentage by weight: 70 percent of HDPE, 30 percent of random copolymerization PP and 750N/mm of Young modulus2；
b. The foam functional layer comprises the following components in percentage by weight: 30% of EVA, 61.4% of LDPE, 5% of ADCA, 1.0% of antioxidant, 0.6% of antibacterial agent, 0.5% of ZnO and ZnSt2The content is 1.5%.
c. The wood grain layer comprises the following components in percentage by weight: the content of EVA in the composite particles A is 40 percent, and the content of LDPE is 60 percent; the B composite particle comprises 60 percent of LLDPE and 38.7 percent of MDPE, and the toner accounts for 1.3 percent of the B composite particle, wherein,
the average melting point of the component A particles is 100 ℃, and the average melting point of the component B particles is 110 ℃;
the viscosity difference (B-a) between the B and a combination particles was 250Pa · S at a temperature of 130 ℃ and a shear rate of 500/S. The production process comprises the following steps: respectively gathering the raw materials of the high-transparency scratch-resistant layer, the wood grain texture layer and the foam functional layer into a multilayer co-extrusion die through three extruders, co-extruding the raw materials through a multilayer die head to form a multilayer structure substrate, and forming the wood grain foam through a one-step forming and foaming mode; wherein, in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle diameter of more than or equal to 5 mu m and less than or equal to 100 mu m is 60 percent, and the extrusion flow difference Q of the foam functional layer and the wood grain texture layer1/Q2＝4。
Example 2
The one-step formed spraying-free wood grain foam 2 is basically the same as the embodiment 1, except that:
a. the high-transparency scratch-resistant layer comprises the following components in percentage by weight: LLDPE content of 80%, MDPE content of 20%, Young's modulus of 100N/mm2；
c. The wood grain layer comprises the following components in percentage by weight: the content of LLDPE in the composite particles A is 80 percent, and the content of EVA is 20 percent; the content of LLDPE in the B composite particles is 80 percent, the content of MDPE in the B composite particles is 19.9 percent, and the content of toner accounts for 0.1 percent of the content of the B composite particles;
the average melting point of the particles of the component A is 50 ℃, and the average melting point of the particles of the component B is 90 ℃; the difference in viscosity between the particles of combination B and the particles of combination A (B-A) is 150Pa S at a temperature of 110 ℃ and a shear rate of 1000/S; wherein, in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle diameter of more than or equal to 5 mu m and less than or equal to 100 mu m is 50 percent, and the extrusion flow difference Q of the foam functional layer and the wood grain texture layer1/Q2＝100。
Example 3
The one-step formed spraying-free wood grain foam 3 is basically the same as the one in the embodiment 1, except that:
a. the high-transparency scratch-resistant layer comprises the following components in percentage by weight: the content of the random copolymerization PP is 20 percent, the content of LLDPE is 80 percent, and the Young modulus is 340N/mm2；
b. The foam functional layer comprises 40% of EVA (ethylene vinyl acetate), 20% of LDPE (low-density polyethylene), 25% of POE (polyolefin elastomer), 10% of ADCA (acrylonitrile-butadiene-styrene), 1.0% of antioxidant and 4% of ZnO.
c. The wood grain layer comprises the following components in percentage by weight: the content of LDPE of the A composite particles is 100 percent; the B composite particle comprises 40% of PP (polypropylene), 40% of ethylene-propylene copolymer and 10% of MDPE (medium density polyethylene), and the toner accounts for 10% of the B composite particle. The average melting point of the particles of the component A is 110 ℃, and the average melting point of the particles of the component B is 130 ℃;
the viscosity difference (B-A) between the particles of the B combination and the particles of the A combination is 250Pa S at a temperature of 140 ℃ and a shear rate of 800/S.
Wherein, in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle diameter of more than or equal to 5 mu m and less than or equal to 100 mu m is 70 percent, and the extrusion flow rate difference Q of the foam functional layer and the wood grain texture layer1/Q2＝100。
Example 4
The one-step formed spraying-free wood grain foam 4 is basically the same as the one in the embodiment 1, except that:
a. the high-transparency scratch-resistant layer comprises the following components in percentage by weight: the content of random copolymerized PP is 20 percent, the content of isotactic copolymerized PP is 80 percent, and the Young modulus is 1500N/mm2；
b. The foam functional layer comprises 40% of EAA, 20% of LLDPE, 25% of POP, 13% of ADCA and 2% of ZnO.
c. The wood grain layer comprises the following components in percentage by weight: the content of LLDPE in the B composite particles is 90%, and the content of toner accounts for 10% of the content of the B composite particles. The average melting point of the B composite particles is 105 ℃; the viscosity difference (B-A) between the particles of the B combination and the particles of the A combination is 300Pa S at a temperature of 140 ℃ and a shear rate of 800/S.
Flow differential Q is extruded to cotton functional layer of bubble and wood grain texture layer1/Q2＝35。
Example 5
The one-step formed spraying-free wood grain foam 5 is basically the same as the one in the embodiment 1, except that:
a. the high-transparency scratch-resistant layer comprises the following components in percentage by weight: the content of random copolymerization PP is 20 percent, the content of LDPE is 80 percent, and the Young modulus is 500N/mm2；
c. The wood grain layer comprises the following components in percentage by weight: the B composite particle comprises 60 percent of LLDPE, 30 percent of MDPE and 5 percent of MDPE, and the toner accounts for 5 percent of the B composite particle.
Wherein, in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle diameter of more than or equal to 5 mu m and less than or equal to 100 mu m is 70 percent, and the extrusion flow rate difference Q of the foam functional layer and the wood grain texture layer1/Q2＝50。
Comparative example 1
Comparative example 1 on the basis of example 1, the following differences were made:
the wood grain layer comprises the following components in percentage by weight: b composite particles with the PP content of 100 percent. The average melting point of the B combination particles is 145 ℃, and the average melting point of B is 45 ℃ higher than that of the A combination particles; the difference in viscosity between the particles of combination B and the particles of combination a (B-a) at a temperature of 130 ℃ and a shear rate of 800/S was 1300Pa S; flow differential Q is extruded to cotton functional layer of bubble and wood grain texture layer1/Q2＝1。
Comparative example 2
Comparative example 1 on the basis of example 1, the following differences were made:
the wood grain layer comprises the following components in percentage by weight: the LLDPE content of the B combination particles is 80 percent, the HDPE content is 18.7 percent, the average melting point of the B combination particles is 104 ℃, and the B is more than 4 ℃ of the average melting point of the A combination particles; the viscosity difference (B-a) between the particles of combination B and the particles of combination a was 30Pa · S at a temperature of 130 ℃ and a shear rate of 500/S. Wherein, in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle diameter of more than or equal to 5 μm and less than or equal to 100 μm is 25 percent.
Comparative example 3
Comparative example 1 on the basis of example 1, the following differences were made:
the wood grain layer comprises the following components in percentage by weight: the content of the toner accounts for 0.02 percent of the content of the B combined particles; wherein the weight fraction of the agglomerate size of the color master batch particles is more than or equal to 5 mu m and less than or equal to 100 mu m is 5 percent.
The products prepared in the above examples and comparative examples were subjected to scratch resistance test:
1. the scratch resistance degree test method is used for testing by referring to a five-finger scratch method.
2. The device name: multifunctional scratch-resistant instrument
3. And (3) testing conditions are as follows: the stroke is 100-200 mm; the speed is 100 +/-10 mm/s; the diameter of the metal scraping head is 0.75 mm; the material is as follows: tungsten carbide; the weight is 8-12N.
4. The judgment method comprises the following steps: judging the scratch-resistant grade A only by slight scratch and no fluffing phenomena; the scratch resistance grade B is judged as the severe scratch and the light micro-fluffing phenomenon; scratch resistance grade C was judged as very severe scratching, and more severe fuzzing.
Figure BDA0002853888090000081
As shown in the table: in examples 1-5, the wood-grain foam has clear texture effect, concave-convex touch of wood grains, scratch resistant effect, fine foam cell size and good appearance. In contrast, in comparative examples 1 to 3, the wood grain was not clear or had no scratch-resistant effect.
Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.

Claims (10)

1. The utility model provides a one shot forming exempts from to spray the wood grain bubble cotton which characterized in that: the foam is a multi-layer structure formed by one-step foaming, which sequentially comprises a high-transparency scratch-resistant layer, a wood grain texture layer and a foam functional layer from top to bottom, wherein,
the raw material of the wood grain texture layer consists of composite particles A and composite particles B, wherein the composite particles A comprise low-melting-point resin, the composite particles B comprise high-melting-point resin and toner, and the weight of the toner is 0.1-10% of the total weight of the toner and the high-melting-point resin; and the average melting point of the B composite particles is +5 ℃ to 40 ℃ of the average melting point of the A composite particles.
2. The one-step forming spraying-free wood grain foam as recited in claim 1, wherein: the viscosity difference of the B combination particles and the A combination particles is more than 150Pa S and less than 1300Pa S under the conditions that the temperature is 110-140 ℃ and the shear rate is 500-1000/S;
the average melting point of the low-melting-point resin is 50-110 ℃, and the low-melting-point resin is any one or more of EVA, EAA, LDPE, LLDPE and EPDM;
the high melting point resin composition has an average melting point of 90 to 130 ℃ and is any one or more of LLDPE, MDPE, HDPE, ethylene-propylene copolymer and PP.
3. The one-step forming spraying-free wood grain foam as recited in claim 1, wherein: the raw materials of the high-permeability scratch-resistant layer comprise any two or more of HDPE, MDPE and LLDPE, random copolymerization PP, isotactic copolymerization PP and homopolymerization PP; it is 100N/mm2Young's modulus not less than 1500N/mm2。
4. The one-step forming spraying-free wood grain foam as recited in claim 1, wherein: the A composite particle also comprises one or more of a filling material, an interfacial compatilizer, a plasticizer, an antioxidant and a crosslinking agent.
5. The one-step forming spraying-free wood grain foam as recited in claim 1, wherein: the raw materials of the foam functional layer comprise resin, a foaming agent and other auxiliaries; the resin is selected from one or more of EVA, LDPE, LLDPE, EAA, EPDM, POE and POP; the foaming agent is selected from one or more of ADCA, OBSH and DPT, and the other auxiliary agent is selected from one or more of antioxidant, auxiliary antioxidant, antibacterial agent, antistatic agent, flame retardant, filler and foaming catalyst; and the density of the foam functional layer is 50-800kg/m3The density of the wood grain foam is 50-1000kg/m3。
6. The one-step forming spraying-free wood grain foam as recited in claim 1, wherein: the thickness of the high-transparency scratch-resistant layer is 0.05-2mm, the thickness of the wood grain texture layer is 0.02-0.5mm, and the thickness of the foam functional layer is 0.06-10 mm.
7. The production process of the one-step molding spraying-free wood grain foam as claimed in claim 1, which is characterized in that: the process comprises the steps of respectively gathering raw materials of a high-transparency scratch-resistant layer, a wood grain texture layer and a foam functional layer into a multilayer co-extrusion die through three extruders, co-extruding the raw materials through a multilayer die head to form a multilayer structure substrate, and forming the wood grain foam through one-step forming and foaming, wherein,
in the forming and foaming process, the foaming temperature is T + 60-T +160 ℃, wherein T is the average melting point in the formula components of the foam functional layer.
8. The production process of the one-step forming spraying-free wood grain foam as claimed in claim 7, wherein the production process comprises the following steps: in the multilayer co-extrusion die, the extrusion flow Q of the foam functional layer1And extrusion flow rate Q of the wood grain texture layer2The relationship of (1) is: q is not less than 31/Q2≤100。
9. The production process of the one-step forming spraying-free wood grain foam as claimed in claim 7, wherein the production process comprises the following steps: in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle size of more than or equal to 5 mu m and less than or equal to 100 mu m is more than or equal to 50 percent.
10. The production process of the one-step molding spraying-free wood grain foam as claimed in claim 9, which is characterized in that: in the color master batch agglomeration, the weight fraction of the color master batch agglomeration with the particle size of more than or equal to 5 mu m and less than or equal to 100 mu m is more than or equal to 65 percent.
CN202011537263.8A 2020-12-23 2020-12-23 One-step forming spraying-free wood grain foam and production process thereof Pending CN112706487A (en)

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