AU2015391767B2

AU2015391767B2 - A board used for floor and preparation method thereof

Info

Publication number: AU2015391767B2
Application number: AU2015391767A
Authority: AU
Inventors: Haixing LI
Original assignee: Jiangsu Kentier Wood Co Ltd
Current assignee: Jiangsu Kentier Wood Co Ltd
Priority date: 2015-06-10
Filing date: 2015-06-10
Publication date: 2018-01-04
Anticipated expiration: 2035-06-10
Also published as: AU2015391767A1; WO2016197347A1

Abstract

(12) tfMIA JPPi *IW (10) (43)E~# WO 2016/197347 A1 2016 * 12 P] 15 H (15.12.2016) WIPO I PCT (51) 043*19*I: BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, C08K 3/26 (2006.01) C08K13/02 (2006.01) CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, (21) KIEtY : PCT/CN2015/081184 JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LU, (22) 0 FYV : 2015 6 A9 10 H (10.06.2015) LY, MA, MD, ME, MG, MK, MN, MW, MNX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, (25) $4fc: $1 RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, (26) A*WI : mY VC, VN, ZA, ZM, ZWo (71) $4A: [ M E*NflR9 (JIANGSU (84) 4Ht (g Wgg $g KENTIER WOOD CO., LTD.) [CN/CN]; Th N1tfl' V tP): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, R FH11T5'F IZfit± 88 t, Jiangsu 212300 (CN)o RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), rV A (AM, AZ, (72) t Qf A: ES (LI, Haixing); +' [A i MW ) BY, KG, KZ, RU, TJ, TM), rU tIl (AL, AT, BE, BG, CH, fR E f R)d 88 Jiangsu 212300 (CN)o CY, CZ, DE, DK, EE, ES, Fl, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, (74) RtAWA: ILA (BEYOND RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, ATTORNEYS AT LAW); 5+'$$jE ErL4tL GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)o S 39-5t t | 6 gBeijing 100036 (CN)o (81) f0t Z ~ T~ $K~fl~ HA 21 * K(3)_" )9fAn t) AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, (54) Title: BOARD FOR FLOOR AND MANUFACTURING METHOD THEREFOR =~(5 4) & (57) Abstract: The present invention relates to a board for a floor. The board comprises a plastic board and a semi-rigid PVC layer adhered to the plastic board. Raw materials for manufacturing the plastic board comprise the following components in weight per centage: 45% to 60% of PVC, 28% to 40% of light calcium carbonate, 1% to 3% of calcium-zinc compound stabilizer, 0.4% to 0.6% of PVC internal lubricant, 0.2% to 0.3% of PVC external lubricant, 0.2% to 0.4% of foaming agent, 0.3% to 0.5% of sodium bicarbonate, 3% to 5% of PVC foaming regulator, 1% to 3% of toughener, and 2% to 4% of PVC intensifier, wherein the total of weight percentages of the raw materials for manufacturing the plastic board is 100%. The board for a floor provided in the present invention has a low moisture absorption rate and has zero formaldehyde. The plastic board has excellent performance in impact res istance, abrasion resistance, elastic recovery, residual indentation and the like by selecting raw material components of the plastic board and the and contents thereof, raw material components of the semi-rigid PVC layer and contents thereof, manufacturing pro cess conditions and the like. n $J 4%EE 9 A iA A btLL M nT fl : PVC4 5~-6 0%; $ iid2 2 8~-4 0%;1 -M#13%; PVC F l140 0.4~-0.6 %; PVC klNQV90 0.2~-0.3 0% aRU 0.2~0.4 0 /J4TT 0.3~-0.5 % PVC a tY)J l 3 5 2)J l~3%o; PVC 24J 2,4%o; *TiMnF 1J4 Ft 0 n i f LLtW fJ 1000% o fn olT 9 FI_ t4ktj M fi rffL r-Li4 kti4h~Q#h # , PV tt Wk

Description

The present invention relates to a board for a floor. The board comprises a plastic board and a semi-rigid PVC layer adhered to the plastic board. Raw materials for manufacturing the plastic board comprise the following components in weight per= centage: 45% to 60% of PVC, 28% to 40% of light calcium carbonate, 1% to 3% of calcium-zinc compound stabilizer, 0.4% to 0.6% of PVC internal lubricant, 0.2% to 0.3% of PVC external lubricant, 0.2% to 0.4% of foaming agent, 0.3% to 0.5% of sodium bicarbonate, 3% to 5% of PVC foaming regulator, 1% to 3% of toughener, and 2% to 4% of PVC intensifier, wherein the total of weight percentages of the raw materials for manufacturing the plastic board is 100%. The board for a floor provided in the present invention has a low moisture absorption rate and has zero formaldehyde. The plastic board has excellent performance in impact res istance, abrasion resistance, elastic recovery, residual indentation and the like by selecting raw material components of the plastic board and the and contents thereof, raw material components of the semi-rigid PVC layer and contents thereof, manufacturing pro cess conditions and the like.

PVCM; M

PVC45 —60%; 28—40% ; FWfi/n FtS0LI 1 —3 % ;

PVC #/0ί#0Ι|θ.4-0.6%; PVC #/0if 0IJ 0.2—0.3%; 0.2—0.4 % ; ΦΦΦΤ 0.3—0.5 % ; PVC 3 —5%; ±f®0IJl— 3%; PVC ±| WfLl 2—4% ; 100% = wi; ΦΟ5 PvcMJMSfflbSWWM'J#

WO 2016/197347 Al

A board used for floor and preparation method thereof

Technical field

The present invention belongs to the field of preparation of floor board, and specifically relates to a board used for floor and preparation method thereof.

Background art

A wood-plastic composite board is a new high-tech environmental friendly decorative material produced by mixing evenly wood (wood cellulose, plant cellulose) acting as a base material, thermoplastic polymer material (plastic), processing aid and others, and then carrying out extrusion molding with heating through a die equipment. The wood-plastic composite board has properties of both wood and plastic, and is a novel composite material that can replace wood and plastic.

The raw materials for the wood-plastic composite board are wood materials comprising wood cellulose, plant cellulose and others, which are easy to absorb moisture and thus result in deformation and warping of the board, affecting the use thereof. On the other hand, the wood-plastic composite board uses a large quantity of adhesives in order to bond the wood materials together, and thereby introduces a large quantity of organic solvents such as formaldehyde, resulting in the content of the organic solvents such as formaldehyde in an indoor environment exceeding standard, which is harmful to human health.

Stone plastic floor in the prior art are often unable to meet the performance requirements for floor, and produces floor just simply by PVC foaming. Thus it has poor impact resistance, poor abrasion resistance, large residual indentation, and is unable to hold weights for a long time.

2015391767 15 Aug 2017

Therefore, there is a need to develop a board used for floor to replace the wood-plastic composite board. Said board is required to have characteristics of low moisture absorption and zero content of formaldehyde, and also overcomes problems of poor impact resistance, poor abrasion resistance and large residual indentation present in the stone plastic board in the art.

Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims.

Throughout this specification the word comprise, or variations such as comprises or comprising, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

Contents of the invention

The present invention according to one or more embodiments provides a board used for floor having low moisture absorption and no formaldehyde, and ideal properties of impact resistance, abrasion resistance and residual indentation.

An aspect of the present invention provides a board used for floor, wherein the board comprises a stone plastic plate and a semirigid PVC layer bonded on the stone plastic plate;

the raw materials for preparing the stone plastic plate comprise the following components based on weight percentage:

PVC 45-60%

2015391767 15 Aug 2017 light calcium carbonate calcium zinc composite stabilizer

PVC internal lubricant

PVC external Lubricant foaming agent

28-40%

1-3%

0.4-0.6%

0.2-0.3%

0.2-0.4%

2A sodium bicarbonate

0.3-0.5%

PVC foam conditioning agent toughening agent

3-5%

1-3%

PVC reinforcing agent

2-4%;

with the sum of these weight percentages being 100%.

Wood fibers contained in a wood plastic board are easy to absorb moisture, resulting in deformation of the board and making the board becomes warping or mouldy. On the other hand, adhesives for wood fibers in the wood plastic board contain a large quantity of formaldehyde, which results in a serious environmental pollution and is also harmful to human health. The floor board provided by the present invention contains no wood fiber, and thus a board used for floor having low moisture absorption and zero content of formaldehyde is obtained. In addition, bonding semirigid PVC on the stone plastic plate realizes the effects of impact resistance and abrasion resistance, and makes the product has elastic recovery ability and smaller residual indentation.

The raw materials for preparing the stone plastic plate of the present invention comprise the following components based on weight percentage:

PVC

45-60% light calcium carbonate

28-40% calcium zinc composite stabilizer 1-3%

PVC internal lubricant

0.4-0.6%

PVC external Lubricant

0.2-0.3% foaming agent

0.2-0.4%

Sodium bicarbonate

0.3-0.5%

PVC foam conditioning agent

3-5% toughening agent

1-3%

PVC reinforcing agent

2-4%;

with the sum of these weight percentages being 100%.

The raw materials for preparing the stone plastic plate of the present invention comprise no wood fiber. The stone plastic plate comprising no wood fiber is prepared by foaming and shaping the mixture of calcium carbonate and PVC under the action of the foaming agent. The stone plastic plate provided by the present invention has properties which can be comparable with those of the traditional wood plastic board, and are fully able to replace the wood plastic board to be used as a floor board.

As a preferred embodiment, said PVC in the present invention is 8 type PVC.

In the stone plastic plate used for floor board provided by the present invention, a board prepared by PVC foaming is a skeleton, and light calcium carbonate is used for filling. The filling uniformity and amount of the light calcium carbonate have great influence on the properties of the stone plastic plate. For example, if the distribution of the light calcium carbonate is not uniform, the stone plastic plate will have nonuniform hardness, poor impact resistance and poor elastic recovery ability; if the content of the light calcium carbonate is too low, the stone plastic plate will have insufficient hardness and reduced impact resistance; and if the content of the light calcium carbonate is too high, the hardness of the stone plastic plate is too high, and thus the elasticity is smaller, which makes a bad feel for a person when treading on the stone plastic plate.

With respect to the light calcium carbonate, the sedimentation volume has certain influence on the board used for floor. When the sedimentation volume is less than 2.2 mL/g, the distribution of the light calcium carbonate is not uniform in the stone plastic plate, which affects the uniformity of hardness of the stone plastic plate.

The sedimentation volume of the light calcium carbonate in the present invention is 2.4-2.8 mL/g, for example 2.5 mL/g, 2.6 mL/g, 2.7 mL/g, etc.; and the specific surface area thereof is 4-6 m²/g.

PVC lubricants are classified into two types: external lubricant and internal lubricant. The role of the external lubricant is mainly to improve the friction between the polymer melt and the hot metal surface of the processing equipment. The role of the internal lubricant inside a polymer is to reduce intermolecular cohesion of the polymer, so as to improve the internal friction heat and melt fluidity of a plastic melt.

The PVC internal lubricant of the present invention is preferably G60 internal lubricant; and preferably, the PVC external lubricant is PE wax.

Preferably, the foaming agent of the present invention is AC foaming agent.

The PVC foam conditioning agent of the invention is PVC foam conditioning agent LP-90.

The addition of PVC foam conditioning agent can promote PVC plasticizing, improve the melt strength of PVC foaming material, prevent bubble from merging, make a uniformly foaming product to be obtained, and ensure good fluidity of a melt and a good appearance of the obtained product.

The toughening agent of the present invention is chlorinated polyethylene. The addition of the toughening agent can improve the toughness and impact resistance of the board.

The PVC reinforcing agent of the present invention is PVC reinforcing agent JM01. The addition of the reinforcing agent can increase the modulus of the material.

As a preferred embodiment, the raw materials for preparing the stone plastic plate of the present invention comprise the following components based on weight percentage:

type PVC 45-60% light calcium carbonate 28-40% calcium zinc composite stabilizer 1-3%

G60 internal lubricant 0.4-0.6%

PE wax 0.2-0.3%

AC foaming agent 0.2-0.4% sodium bicarbonate 0.3-0.5%

PVC foam conditioning agent LP-90 3-5% chlorinated polyethylene 1-3%

PVC reinforcing agent JM01 2-4%;

with the sum of these weight percentages being 100%.

type PVC 52.5% light calcium carbonate 35% calcium zinc composite stabilizer

2%

G60 internal lubricant 0.5%

PE wax 0.2%

AC foaming agent 0.3% sodium bicarbonate 0.4%

PVC foam conditioning agent LP-90 4.2% chlorinated polyethylene 2.1%

PVC reinforcing agent JMO1 2.8 %.

The raw materials for preparing the semirigid PVC layer of the present invention comprise the following components based on weight percentage:

PVC 100 ground calcium carbonate 360-440

DOTP 30-40 calcium zinc composite stabilizer 3-4.

Preferably, the raw materials for preparing the semirigid PVC layer comprise the following components based on weight percentage:

PVC 100 ground calcium carbonate 400

DOTP 35 calcium zinc composite stabilizer

3.5.

The raw material formula of the semirigid PVC layer further defined in the present invention can make the board used for floor provided by the present invention has further improved impact resistance and abrasion resistance, reduced residual indentation, and improved elastic recovery ability.

The thickness of the PVC layer bonded on the stone plastic plate is 1~2 mm.

The bonding of the semirigid PVC layer and the stone plastic plate is realized through an adhesive, which can be any one of the adhesives used for PVC available in the art.

The adhesive is selected from PVC adhesive, preferably from diphenyl methane diisocyanate.

As an optional embodiment, the board comprises a stone plastic plate and a semirigid PVC layer bonded on the stone plastic plate through an adhesive and having a thickness of 1~2 mm;

type PVC

52.5% light calcium carbonate

35% calcium zinc composite stabilizer

2%

G60 internal lubricant

0.5%

PE wax

0.2%

AC foaming agent

0.3% sodium bicarbonate

0.4%

PVC foam conditioning agent LP-90 4.2% chlorinated polyethylene 2.1%

PVC reinforcing agent JMO1 2.8%;

the raw materials for preparing the semirigid PVC layer comprise the following components based on weight percentage:

PVC 100 ground calcium carbonate 400

DOTP 35 calcium zinc composite stabilizer 3.5;

the adhesive is PVC adhesive, preferably selected from diphenyl methane diisocyanate.

The invention also provides a method for preparing a board used for floor described in one of the purposes, and the method comprises the following steps:

(1) mixing the raw materials of PVC layer, and then banburying, open milling, rolling, cooling and shaping, dragging, cutting, and thereby obtaining a PVC layer;

(2) mixing the raw materials of the stone plastic plate, and then extruding and plasticizing, cooling and shaping, dragging, cutting, and thereby obtaining a stone plastic plate.

(3) coating adhesive on the stone plastic plate obtained in step (2); then gluing the

PVC layer obtained in step (1) onto the stone plastic plate obtained in step (2), then cold rolling, punching, grooving, and thereby obtaining a board used for floor.

The time for banburying in step (1) of the preparation method of a board used for floor of the present invention is 4~8 min, for example 4.3 min, 4.6 min, 4.9 min, 5.3 min, 5.6 min, 5.9 min, 6.4 min, 6.8 min, 7.3 min, 7.8 min, etc., preferably 5~6 min.

Preferably, the coating thickness of the adhesive in step (3) is 60-80 g/m², for example 63 g/m², 64 g/m², 67 g/m², 70 g/m², 72 g/m², 75 g/m², 77 g/m², 79 g/m², etc., preferably 70 g/m².

The present invention has the following beneficial effects compared to the prior art:

(1) The present invention utilizes a stone plastic plate comprising no wood fiber to replace the wood plastic board comprising wood fibers as the main materials as a board used for floor, which greatly reduces the moisture absorption of the floor and ensures wet resistance, deformation resistance and mildew resistance of the floor board, and ensures the content of formaldehyde to be zero.

(2) The present invention makes a stone plastic plate have excellent properties in terms of impact resistance, abrasion resistance, elastic recovery and residual indentation, etc., by choosing the components of the raw materials of the stone plastic plate and contents thereof, the components of the raw materials of the semirigid PVC layer and contents thereof, and the conditions of the preparation process, etc.

(3) The board used for floor provided by the present invention can be directly used as a floor board without further post-processing.

Embodiments

Hereinafter, the technical solutions of the present invention are further described by

2015391767 30 Nov 2017 the specific embodiments.

Those skilled in the art should appreciate that the embodiments are intended to facilitate understanding the present invention and should not be deemed as a limitation to the present invention.

Example 1

A board used for floor, comprising a stone plastic plate and a semirigid PVC layer bonded on the stone plastic plate through an adhesive; the raw materials for preparing the stone plastic plate comprise the following components based on weight percentage:

PVC 45% light calcium carbonate 40% calcium zinc composite stabilizer 3%

PVC internal lubricant 0.6%

PVC external lubricant 0.3% foaming agent 0.4% sodium bicarbonate 0.5%

PVC foam conditioning agent 5% toughening agent 3%

PVC reinforcing agent 2.2%;

PVC

100 ground calcium carbonate

360

DOTP calcium zinc composite stabilizer

4;

the adhesive is CY1003 adhesive purchased from Shenzhen Degoo Adhensive Co., LTD and containing diphenyl methane diisocyanate as the main component.

The preparation method of the board used for floor of the present invention has the following steps:

(1) mixing the raw materials of the PVC layer, and then banburying for 5~6 min, open milling, rolling, cooling and shaping, dragging, cutting, and thereby obtaining the PVC layer;

(2) mixing the raw materials of the stone plastic plate, and then extruding and plasticizing, cooling and shaping, dragging, cutting, and thereby obtaining the stone plastic plate.

(3) coating adhesive on the stone plastic plate obtained in step (2) with a coating thickness of 70g/m²; then gluing the PVC layer obtained in step (1) onto the stone plastic plate obtained in step (2), then cold rolling, punching, grooving, and thereby obtaining a board used for floor.

Example 2

A board used for floor, comprising a stone plastic plate containing no wood fiber and a PVC layer bonded on the stone plastic plate; the raw materials for preparing the stone plastic plate comprise the following components based on weight percentage:

type PVC 60% light calcium carbonate 28% calcium zinc composite stabilizer 1 %

G60 internal lubricant 0.4%

PVC external lubricant 0.2%

AC foaming agent 0.2% sodium bicarbonate 0.3%

PVC foam conditioning agent 3.9% toughening agent 2%

PVC reinforcing agent JM01 4%;

PVC 100 ground calcium carbonate 440

DOTP 40 calcium zinc composite stabilizer 3;

(1) mixing the raw materials of the PVC layer, and then banburying for 4~5 min, open milling, rolling, cooling and shaping, dragging, cutting, and thereby obtaining the PVC layer;

(3) coating adhesive on the stone plastic plate obtained in step (2) with a coating thickness of 80 g/m²; then gluing the PVC layer obtained in step (1) onto the stone plastic plate obtained in step (2), then cold rolling, punching, grooving, and thereby obtaining a board used for floor.

Example 3

type PVC

45-60% light calcium carbonate

28-40% calcium zinc composite stabilizer

1-3%

PVC internal lubricant

0.4-0.6%

PE wax

0.2-0.3%

AC foaming agent

0.2-0.4% sodium bicarbonate

0.3-0.5%

PVC foam conditioning agent LP-90 3-5% chlorinated polyethylene 1-3%

PVC reinforcing agent 2-4%;

PVC 100 ground calcium carbonate 380

DOTP 36 calcium zinc composite stabilizer 3.7;

the adhesive is PVC adhesive.

(1) mixing the raw materials of the PVC layer, and then banburying for 7-8 min, open milling, rolling, cooling and shaping, dragging, cutting, and thereby obtaining the PVC layer;

(3) coating adhesive on the stone plastic plate obtained in step (2) with a coating thickness of 60 g/m²; then gluing the PVC layer obtained in step (1) onto the stone plastic plate obtained in step (2), then cold rolling, punching, grooving, and thereby obtaining a board used for floor.

Example 4

type PVC 52.5% light calcium carbonate 35% calcium zinc composite stabilizer 2%

G60 internal lubricant 0.5%

PE wax 0.2%

AC foaming agent 0.3% sodium bicarbonate 0.4%

PVC foam conditioning agent LP-90 4.2% chlorinated polyethylene 2.1%

PVC reinforcing agent JM01 2.8%;

PVC 100 ground calcium carbonate

400

DOTP 35 calcium zinc composite stabilizer 3.5;

The preparation method of the board used for floor according to the present invention has the following steps:

(1) mixing the raw materials of the PVC layer, and then banburying for 6~7 min, open milling, rolling, cooling and shaping, dragging, cutting, and thereby obtaining the PVC layer;

(3) coating adhesive on the stone plastic plate obtained in step (2) with a coating thickness of 75 g/m²; then gluing the PVC layer obtained in step (1) onto the stone plastic plate obtained in step (2), then cold rolling, punching, grooving, and thereby obtaining the board used for floor.

Comparative Example 1

A board used for floor, and the distinction between it and that of Example 4 lies in that the light calcium carbonate is replaced with calcite in this example.

Comparative Example 2

A board used for floor, and the distinction between it and that of Example 4 lies in that the light calcium carbonate is replaced with microlite in this example.

Comparative Example 3

A board used for floor, and the distinction between it and that of Example 4 lies in that the semirigid PVC layer is not bonded in this example.

Comparative Example 4

A board used for floor, and the distinction between it and that of Example 4 lies in that a rigid PVC layer is bonded in this example.

Performance Testing

The hardness is tested according to the provisions of GB/T 9342-1988. Aboard used for floor is required to have a hardness greater than 58HRR.

The glossiness of the board used for floor is tested using WGG60 gloss meter by testing the glossiness at the four comers and center of the board and then calculating the average thereof. A board used for floor is required to have a glossiness between

5-8.

The surface abrasion resistance is tested according to the provisions of 6.3.11 chapter of GB/T 18102-2007. A board used for floor is required to have a surface abrasion resistance between 350-3500 rounds.

The falling ball impact resistance is tested according to the provisions of 6.3.16 chapter of GB/T 18102-2007. The falling ball impact resistance for a board used for floor is required to have a pit diameter V 12mm.

The residual indentation is tested according to the provisions of 6.7 chapter of GB/T 4085-2005. A board used for floor is required to have a residual indentation C 0.1mm.

The moisture absorption is tested according to the provisions of 4.6 chapter of GB/T 17657-1999. A board used for floor is required to have a moisture absorption C10%.

The formaldehyde content is tested according to GB 18580-2001 laminate flooring formaldehyde test standard, and the results show that all the formaldehyde contents is 0. A board used for floor is required to have a formaldehyde content A0.5mg/1 OOg.

The results of these performance tests are shown in table 1.

Table 1 Results of performance testing of boards used for floor provided by examples 1-4 and comparative examples.

Item	Hardness	Glossiness	Abrasion	Impact	Residual	Moisture	Formaldehyde
		(HRR)		resistance	resistance	indentation	absorption	content (%)
				(rmp)	(mm)	(mm)	(%)
Example	1	62	6	3500	5	0	3	0
	2	63	6	3400	5	0	2	0
	3	64	7	3400	4	0	3	0
	4	63	6	3300	6	0	2	0
Comparative Example	1	60	6	3300	8	0.2	4	0
2	59	6	3300	10	0.1	3	0
	3	40	6	300	20	3	4	0
	4	35	6	3600	12	0	3	0

As can be seen from table 1, semirigid PVC layer can effectively improve the abrasion resistance, impact resistance and residual indentation, and the selection of the light calcium carbonate in the stone plastic plate can also commendably improve the hardness, abrasion resistance, impact resistance and residual indentation of the board used for floor. On the other hand, the board used for floor provided by the present invention has low moisture absorption and a formaldehyde content of 0, and thus overcomes the problems of deformation and mildew of the floor board due to moisture absorption, etc., and of environmental pollution caused by formaldehyde.

The applicant states that: the above examples give description on the process method of the present invention, but the invention is not limited to the above detailed processing steps, that is to say, it does not mean that the present invention must rely on the above processing steps to be implemented. Those skilled in the art to which the present invention belongs should appreciate that any improvement to the present invention, equivalent replacement to the selected components of the present invention and addition of auxiliary components, and choice of specific embodiments will fall into the scope protected and disclosed by the present invention.

2015391767 30 Nov 2017

Claims

(1) mixing the raw materials of the PVC layer, and then banburying, open milling, rolling, cooling and shaping, dragging, cutting, and thereby obtaining the PVC layer;

1. A board used for floor, wherein the board comprises a stone plastic plate and a semi-rigid PVC layer bonded on the stone plastic plate;

the raw materials for preparing the stone plastic plate comprise the following components based on weight percentage:

PVC 45-60% light calcium carbonate 28-40% calcium zinc composite stabilizer 1-3%

PVC internal lubricant 0.4-0.6%

PVC external Lubricant 0.2-0.3% foaming agent 0.2-0.4% sodium bicarbonate 0.3-0.5%

PVC foam conditioning agent 3-5% toughening agent 1 -3 %

PVC reinforcing agent 2-4%;

with the sum of these weight percentages being 100%.
(2) mixing the raw materials of the stone plastic plate, and then extruding and plasticizing, cooling and shaping, dragging, cutting, and thereby obtaining the stone plastic plate;

2% internal lubricant

0.5%

PE wax

0.2%

AC foaming agent

0.3%

2015391767 30 Nov 2017 sodium bicarbonate 0.4%

PVC foam conditioning agent 4.2% chlorinated polyethylene 2.1 %

PVC reinforcing agent 2.8%;

the raw materials for preparing the semi-rigid PVC layer comprise the following components based on weight percentage:

PVC 100 ground calcium carbonate 400

DOTP 35 calcium zinc composite stabilizer 3.5;

the adhesive is PVC adhesive, preferably selected from diphenyl methane diisocyanate.

2. The board of claim 1, wherein the PVC in the raw materials for preparing the stone plastic plate is 8 type PVC;

preferably, the sedimentation volume of the light calcium carbonate is 2.4-2.8 mL/g; and the specific surface area thereof is 4-6 m /g;

2015391767 30 Nov 2017 preferably, the PVC external lubricant is PE wax;

preferably, the foaming agent is AC foaming agent;

preferably, the toughening agent is chlorinated polyethylene.
(3) coating adhesive on the stone plastic plate obtained in step (2); then gluing the

2015391767 30 Nov 2017

PVC layer obtained in step (1) onto the stone plastic plate obtained in step (2), then cold rolling, punching, grooving, and thereby obtaining a board used for floor.

3.5.

3. The board of claim 1 or 2, wherein the raw materials for preparing the stone plastic plate comprise the following components based on weight percentage:
4. The board of any one of claims 1-3, wherein the raw materials for preparing the stone plastic plate comprise the following components based on weight percentage:
5. The board of any one of claims 1-4, wherein the raw materials for preparing the semi-rigid PVC layer comprise the following components based on weight percentage:

PVC 100 ground calcium carbonate 360-440

DOTP 30-40 calcium zinc composite stabilizer 3-4;

preferably, the raw materials for preparing the semi-rigid PVC layer comprise the following components based on weight percentage:

PVC 100 ground calcium carbonate

400

2015391767 30 Nov 2017

DOTP calcium zinc composite stabilizer
6. The board of any one of claims 1-5, wherein the PVC layer bonded on the stone plastic plate has a thickness of 1-2 mm.
7. The board of any one of claims 1-6, wherein the bonding of the semi-rigid PVC layer with the stone plastic plate is achieved by an adhesive;

the adhesive is selected from PVC adhesive, preferably from diphenyl methane diisocyanate.

8 type PVC

52.5% light calcium carbonate

35% calcium zinc composite stabilizer

8. The board of any one of claims 1-7, wherein the board comprises a stone plastic plate and a semi-rigid PVC layer bonded on the stone plastic plate through an adhesive and having a thickness of 1-2 mm;

8 type PVC 52.5%

2015391767 30 Nov 2017 light calcium carbonate 35% calcium zinc composite stabilizer 2% internal lubricant 0.5%

PE wax 0.2%

AC foaming agent 0.3% sodium bicarbonate 0.4%

PVC foam conditioning agent 4.2% chlorinated polyethylene 2.1 %

PVC reinforcing agent 2.8%.

8 type PVC 45-60% light calcium carbonate 28-40% calcium zinc composite stabilizer 1-3% internal lubricant 0.4-0.6% PE wax 0.2-0.3% AC foaming agent 0.2-0.4% sodium bicarbonate 0.3-0.5% PVC foam conditioning agent 3-5% chlorinated polyethylene 1-3% PVC reinforcing agent 2-4%;

with the sum of these weight percentages being 100%.

9. A method for preparing the board of any one of claims 1-8, wherein the method comprises the following steps:
10. The method of claim 9, wherein the time for banburying in step (1) is 4-8 min, preferably 5-6 min;

preferably, the coating thickness of the adhesive in step (3) is 60-80 g/m , preferably 70 g/m².